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Old 09-23-2002, 10:29 PM
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Boosting FAQs

Hi everyone

I thought I would like to start a boosting FAQ thread. I will edit and add as time goes on. I thought it might be useful to have a thread like this for two reasons:

1. People can get answers quickly on line
2. I don't want to have to ask the same questions over and over!

These FAQs are not compiled in any particular order right now, but I'll try to improve it as I go. Please feel free to ask any questions on this thread. If this is not the appropriate place for this thread please let me know, please don't just delete it! Just trying to help fellow Maxima.org enthusiasts!

By the way, I am not doing this to try to push turbos or start up arguments about whether a S/C is better or Turbo. I want to give facts! If the S/C guys can help on this thread, that would be great ... I am not sure if a thread like this already exists, but I keep getting the same quesitions asked of me again and again so I assume not!

Here goes .... !
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Old 09-23-2002, 10:35 PM
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Q: What will a Turbo/Supercharger do for me?
A: They are very good ways boosting your power and torque.

Q: How do they work?
A: How turbos work

Q: What's the difference between a Supercharger and Turbo?
A: Differences between Turbos and Superchargers


Q: How much power can they generate?
A: I have heard of superchargers going beyond 300HP. I personally have made 371HP/369ft-lbs TQ

Q: Will boosting hurt my motor?
A: If you want factory reliability, stick to the factory setup. If boosted correctly and conservatively, you can get decent gains without compromising too much on engine life.

Q: I have more than 100K miles on my car, is it safe to boost?
A: It's really hard to say. I say a general rule of thumb is, if you do a compression test and everything checks out, you're good to boost! How much? Well, that's up to you! If your engine goes after you boost, rebuild/replace it! That's what junkyard engines are for!

Q: How much boost can I run?
A: You can run 20 psi for about 10 seconds!

Q: What do I need to boost safely, without blowing up the engine?
A: boosting becomes dangerous when you run lean and your engine detonates. This means there is not enough fuel in the air/fuel mixture in the combustion chamber.

You need to be aware when you ARE actually running lean. EGTs (Exhaust Gas Temp) gauges are good start. I also recommend that you get a boost gauge also. These help to tell you when you are running dangerously lean. However DO NOT prevent your engine from blowing up! I recommend gauges with warning lights and buzzers to give instant warning.

Other useful gauges:
Fuel Pressure
Air/Fuel

How to prevent leaness/detonation?
a. install an FMU (Vortech produces some nice ones)
b. install high pressure fuel pump (Walbro 255 lph or 340 lph)
c. install larger injectors 370CC or more
d. Use Air/fuel computer such as S-AFC or Fields'
e. Use J&S knock detection and retard box.
f. Use engine managment

I would say a. and b. are a minimum requirement for any boosted application

Q: What kind of plugs do you run?
A: NGK coppers 2-step colder.

Q: What gap?
A: Stock right now, but you are supposed to reduce the gap by 0.004 for every 50HP increase.

Q: What can I do about the lag?
A: You can

1. get a smaller turbo
2. Run with NOS
3. Get lightened flywheel
4. get smaller/lighter wheels

The lag actually isn't that bad.

Q: Can I get pics of your setup?
A: Yes, those posted on the org.
Q: Can I get more?
A: NO!
Q: Please?
A: NO!

Q: Can I buy your turbo kit, copy it and ask for a refund for all the piping?
A: Nice try! NO!
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Old 09-24-2002, 01:06 AM
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Q: Can you make an inventory parts list with the part number also where you got it from and how much? Afterwards i wont thank you for your help instead i will question your knowledge.
A: no
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Old 09-24-2002, 01:13 AM
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oh, didnt mean to sound like a jack a ss, but im juss tired of all these unappreciative people peskering me for things like an INVENTORY type list?? cmon man, i dont really have that much time to do that plus i dont even know them. oh well.
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Old 09-24-2002, 03:08 AM
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Originally posted by Turbo95Max
oh, didnt mean to sound like a jack a ss, but im juss tired of all these unappreciative people peskering me for things like an INVENTORY type list?? cmon man, i dont really have that much time to do that plus i dont even know them. oh well.
then why post toy factory boy?
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Old 09-24-2002, 05:21 AM
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A few more to add:

1)Can I have a turbo with an automatic?

2)Will my transmission be able to handle the extra power provided by the Turbo/SC?

3)Does anyone make a Turbocharger kit for the Maxima?
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Old 09-24-2002, 06:03 AM
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For both turbo & S/C

Q: If you go back to n/a can I buy your setup dirt cheap?

A: NO, go play in traffic.
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Old 09-24-2002, 06:23 AM
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Re: A few more to add:

Q.
Originally posted by maximised
1)Can I have a turbo with an automatic?
A.Yes .. check the Turbo Thread in the Group Deal Forum

Q.
Originally posted by maximised
2)Will my transmission be able to handle the extra power provided by the Turbo/SC?
A.No one knows for sure.. many people have blow Auto Tranny's with low SC boost.. its recommended that you run a Valve Body Mod and Tranny Cooler with low boost, and a 5spd Transmission or a Auto Rebuild for higher boost.

Q.
Originally posted by maximised
3)Does anyone make a Turbocharger kit for the Maxima?
A.Yes .. check the Turbo Thread in the Group Deal Forum
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Old 09-24-2002, 06:34 AM
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Q: Can you show me pictures of the whole turbo kit (so I can have a shop copy it)?

A: Why look at pictures when you can own it?
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Old 09-24-2002, 06:43 AM
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Q. I thought kit 1 was gonna be around $2000-2400 , why would i spend $4200 on a Turbo kit when i can have a Superchager from Stillen for $3500

A.
[list=1][*]The Turbo Kit includes an Intercooler that the stillen kit does not. - $700. [*]The Turbo kit produces more horsepower and torque @ 4 PSI than the Supercharged Maxima produces @ 10 PSI



[*]The increase of boost takes five seconds with the clicks of a few buttons on a Boost Controller, while the Supercharger may take over an Hour with the replacement of pulleys[*]The Turbo decrease of boost for say winter time takes five seconds with the clicks of a few buttons on a Boost Controller, while the Supercharger may take over an Hour with the replacement of pulleys[/list=1]
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Old 09-24-2002, 06:47 AM
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Originally posted by SprintMax
The Turbo decrease of boost for say winter time takes five seconds with the clicks of a few buttons on a Boost Controller, while the Supercharger may take over an Hour with the replacement of pulleys
No one in their right mind would change to a larger pulley (single) just for winter use.
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Old 09-24-2002, 06:49 AM
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Originally posted by Y2KevSE


No one in their right mind would change to a larger pulley (single) just for winter use.
did you notice the DECREASE .. Phil use to go back down to his 3.33 for Winter
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Old 09-24-2002, 08:05 AM
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Originally posted by SprintMax


did you notice the DECREASE .. Phil use to go back down to his 3.33 for Winter
Decrease or increase? Phil had a smaller pulley, so he would be increasing the pulley size to drop boost. There's no need to do this since I'm sure no one would be boosting in snow.
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Old 09-24-2002, 08:08 AM
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Originally posted by Y2KevSE


Decrease or increase? Phil had a smaller pulley, so he would be increasing the pulley size to drop boost. There's no need to do this since I'm sure no one would be boosting in snow.

i never said anything about pulley size going up or down.. i just said decresing boost stop arguing with me b!tch..

yeah.. people don't boost in snow .. they buy Winter Beaters.. like crx right del.. people wouldn't need to buy winter beaters if they could turn the boost down to 4 PSI instead fo 10 PSI.. even though 4 PSI on a Turbo is more than 10 PSI on a SC
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Old 09-24-2002, 08:11 AM
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Originally posted by SprintMax



i never said anything about pulley size going up or down.. i just said decresing boost :kiss stop arguing with me b!tch..



Originally posted by SprintMax

yeah.. people don't boost in snow .. they buy Winter Beaters.. like crx :wall right del.. people wouldn't need to buy winter beaters if they could turn the boost down to 4 PSI instead fo 10 PSI.. even though 4 PSI on a Turbo is more than 10 PSI on a SC :wall
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Old 09-24-2002, 09:01 AM
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Re: Boosting FAQs

It's too bad this thread is getting filled up with trash, because a boost faq is really needed. Here's something useful:


Approximate boost for different sized supercharger pulleys
3.60" - 6.5 psi
3.48" - 7.5 psi
3.33" - 9.0 psi
3.25" - 10.0 psi
3.125" - 11.0 psi
2.87" - 13.0 psi
2.62" - 15.0 psi


Here's a few questions I have. At what boost level do you need more than what is provided with the stock SC kit from Stillen, i.e., blowoff valve, fmu, afc, etc? When do your plugs need to go one step colder?
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Old 09-24-2002, 09:08 AM
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Re: Re: Boosting FAQs

Originally posted by Stephen Max
It's too bad this thread is getting filled up with trash, because a boost faq is really needed. Here's something useful:


Approximate boost for different sized supercharger pulleys
3.60" - 6.5 psi
3.48" - 7.5 psi
3.33" - 9.0 psi
3.25" - 10.0 psi
3.125" - 11.0 psi
2.87" - 13.0 psi
2.62" - 15.0 psi


Here's a few questions I have. At what boost level do you need more than what is provided with the stock SC kit from Stillen, i.e., blowoff valve, fmu, afc, etc? When do your plugs need to go one step colder?
i thought the stock pulley size was 3.64

some call it trash.. but i think some of the best "trash" argument on the org has brought about great knowledge. maybe i am diffrernt..

and the 2.62 pulley is 14 PSI.. not 15..

you should go one step colder from you bought an SC.. on stock pulley size you should be one step colder.. at 10 PSI two steps colder..

changing the BOV, FMU, AFC is optional.. you can do it at anytime
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Old 09-24-2002, 09:37 AM
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Re: Re: Re: Boosting FAQs

Originally posted by SprintMax

i thought the stock pulley size was 3.64
3.60, turbo boy.


Originally posted by SprintMax

some call it trash.. but i think some of the best "trash" argument on the org has brought about great knowledge. maybe i am diffrernt..
I agree with this.

Originally posted by SprintMax

and the 2.62 pulley is 14 PSI.. not 15..
In theory, 15... but there's always boost loss somewhere.


Originally posted by SprintMax

changing the BOV, FMU, AFC is optional.. you can do it at anytime
8:1 disc if you hit 3.25... safe until 2.87" (from personal experience). I don't know if 10:1 is needed for 2.62"
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Old 09-24-2002, 09:39 AM
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Re: Re: A few more to add:

Originally posted by SprintMax
Q.

A.Yes .. check the Turbo Thread in the Group Deal Forum

Q.

A.No one knows for sure.. many people have blow Auto Tranny's with low SC boost.. its recommended that you run a Valve Body Mod and Tranny Cooler with low boost, and a 5spd Transmission or a Auto Rebuild for higher boost.

Q.

A.Yes .. check the Turbo Thread in the Group Deal Forum
BTW, I knew that, but I thought I would suggest the questions, since I'm sure someone would ask
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Old 09-24-2002, 09:39 AM
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Re: Re: Re: Boosting FAQs

Originally posted by SprintMax
you should go one step colder from you bought an SC.. on stock pulley size you should be one step colder.. at 10 PSI two steps colder..


I'm running the 3.125 pulley with the one step colder spark plugs. You think I should go with the two step plugs?
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Old 09-24-2002, 09:40 AM
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Re: Re: Re: Re: Boosting FAQs

Originally posted by Y2KevSE


3.60, turbo boy.




Originally posted by Y2KevSE

I agree with this.
good man


Originally posted by Y2KevSE

In theory, 15... but there's always boost loss somewhere.
if we are going by that theory and not by whats on the gauge.. then all his numbers are off by 1 PSI


Originally posted by Y2KevSE

8:1 disc if you hit 3.25... safe until 2.87" (from personal experience). I don't know if 10:1 is needed for 2.62"
I have 10:1 in my room.. oh yeah baby.. oh yeah
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Old 09-24-2002, 09:42 AM
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Re: Re: Re: Re: Boosting FAQs

Originally posted by maximised


BTW, I knew that, but I thought I would suggest the questions, since I'm sure someone would ask
yeah i knew you knew.. but the questions still needed to be answered


Originally posted by Cumalot



I'm running the 3.125 pulley with the one step colder spark plugs. You think I should go with the two step plugs?
if you are seeing 10 PSI then yeah.. i always try to use Matt as benchmark since he really goes deep into his tuning.. like EGT and plugs.. and when matt goes two steps colder .. you usually try to go accordingly.. i think think he was at 10 PSI with two steps.. only Search can tell you or matt himself too.. but you probably wont' be able to find matt since he and delio are running off with everyone's money in the J&S group deal
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Old 09-24-2002, 09:47 AM
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One from the 3rd gen guys....

Q: Can you turbocharge a 3rd gen(auto/stick)?
A: Yes.

Max O/D(92 GXE VG Turbo)

FAQ info/writeup:
http://forums.maxima.org/showthread....5&pagenumber=1

Pics:
http://forums.maxima.org/showthread.php?threadid=150579

I guess if anyone knows about Czar's 92 SE VE turbo they can post stuff too...
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Old 09-24-2002, 09:47 AM
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Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by SprintMax


if we are going by that theory and not by whats on the gauge.. then all his numbers are off by 1 PSI
All numbers up to 2.87" are correct (at least for 3.25, 3.125... don't know about 2.87 because I never unhooked the water injection for a full boost run).


Originally posted by SprintMax

I have 10:1 in my room.. oh yeah baby.. oh yeah
Since we're waving penises... I have 3:1, 4:1, 6:1, 8:1, 10:1, and 12:1 AFC helps too.
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Old 09-24-2002, 09:50 AM
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Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by SprintMax

if you are seeing 10 PSI then yeah.. i always try to use Matt as benchmark since he really goes deep into his tuning.. like EGT and plugs.. and when matt goes two steps colder .. you usually try to go accordingly.. i think think he was at 10 PSI with two steps.. only Search can tell you or matt himself too.. but you probably wont' be able to find matt since he and delio are running off with everyone's money in the J&S group deal
I believe Matt went back to 1 step colder copper plugs while running the 3.25/3.125 (?) pulley... he even went back down to 6:1

Yeah, him and Del ran off with the bling bling... (see Del's thread to see what he/they bought).
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Old 09-24-2002, 09:56 AM
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Re: Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by Y2KevSE


All numbers up to 2.87" are correct (at least for 3.25, 3.125... don't know about 2.87 because I never unhooked the water injection for a full boost run).
i think you are full of

Originally posted by Y2KevSE

Since we're waving penises... I have 3:1, 4:1, 6:1, 8:1, 10:1, and 12:1 AFC helps too.
but i have 10:1 and no boost

Originally posted by Y2KevSE


I believe Matt went back to 1 step colder copper plugs while running the 3.25/3.125 (?) pulley... he even went back down to 6:1
i was not aware of that.. thanks for the info.. mike.. take note.. well i am going two steps since thats where nigel is now.. then i will go to one step and see how it runs

Originally posted by Y2KevSE

Yeah, him and Del ran off with the bling bling... (see Del's thread to see what he/they bought).
how do you think i paid for the rest of my turbo kit.. you know del and i are buddies
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Old 09-24-2002, 10:10 AM
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Re: Re: Re: Boosting FAQs

Originally posted by SprintMax

some call it trash.. but i think some of the best "trash" argument on the org has brought about great knowledge. maybe i am diffrernt..
Trash was too strong a word. I apologize profusely.
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Old 09-24-2002, 10:13 AM
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Re: Re: Re: Re: Boosting FAQs

Originally posted by Stephen Max


Trash was too strong a word. I apologize profusely.
no need for appology.. sometimes it is trash...
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Old 09-24-2002, 10:47 AM
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Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by SprintMax
but you probably wont' be able to find matt since he and delio are running off with everyone's money in the J&S group deal

So that's the real reason why Matt left New Orleans.
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Old 09-24-2002, 10:56 AM
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That list of boost pressure by pulley is for a V2 blower, V1's will be a bit lower, IIRC ~10%

Plugs, I went back to one step colder because I am not using nitrous till after I get it retuned since my past few upgrades, 2.62" etc...

According to JWT stock heat rnge is fine , at lest that's what Ron has indicated.

I did go back to the 6:1 in the FMU with a 3.125" and two step colder plugs, it ran very good then and EGT's were 820c peak. I'm pretty sure I was at 100% duty cycle on the injectors, so IMHO 10psi is about the safe limit for stock 240cc injectors, unless you want to ramp the fuel pressure up over 90psi which IMHO is unsafe in the long run. Dont get me wrong hyper high fuel pressure will work, but one hicup at that power level and bu-by.

Since I have the J&S and 370cc injectors I may even go back to stock heat rangeplugs but 1 step is fine for now. With the 370cc injectors I am using a 4:1 FMU disc now and probably could/will use a 3:1. I have not had time to get any dyno work done due to my move to DC. Once that is done I will let you guys know how its looking.

FWIW I have been driving allot on the highway recently and my MPG has been 26-28 I cant believe it!!!
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Old 09-24-2002, 11:33 AM
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Re: Re: Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by SprintMax


<img>http://64.252.156.63/images/squint1.gif</img> i think you are full of <img>http://64.252.156.63/images/bs.gif </img>
Originally posted by MardiGrasMax
That list of boost pressure by pulley is for a V2 blower, V1's will be a bit lower, IIRC ~10%



Originally posted by SprintMax

i was not aware of that.. thanks for the info.. mike.. take note.. well i am going two steps since thats where nigel is now.. then i will go to one step and see how it runs
I also plan on sticking with 2 step colder plugs.


Originally posted by SprintMax

how do you think i paid for the rest of my turbo kit.. you know del and i are buddies :wall
I paid for your turbo kit?!?!?
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Old 09-24-2002, 11:35 AM
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Re: Re: Re: Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by Y2KevSE




:kiss-:

thats not what you said.. you said all numbers up to 3.125 are accurate and then boost look starts bigger pulley than that.. that still makes no sense..


Originally posted by Y2KevSE

I also plan on sticking with 2 step colder plugs.

good for you homey


Originally posted by Y2KevSE

I paid for your turbo kit?!?!?
no Matt and Delio did.. where they got the money.. i dont' know
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Old 09-24-2002, 11:50 AM
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and yes sometimes the best threads turn into crap.. BUT, BS floats to the top. Just sit back and read and see what REAL info comes out and you will be amazed

there is plenty of useful info so far.. but my post takes up good room so I will leave no sig pic
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Old 09-24-2002, 12:45 PM
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Re: Re: Re: Re: Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by SprintMax


thats not what you said.. you said all numbers up to 3.125 are accurate and then boost look starts bigger pulley than that.. that still makes no sense..

U sPeaKa EnRrisH? U MakE no cents.

All numbers up to 2.87" are correct (at least for 3.25, 3.125... don't know about 2.87 because I never unhooked the water injection for a full boost run).
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Old 09-24-2002, 12:51 PM
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Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Boosting FAQs

Originally posted by Y2KevSE


U sPeaKa EnRrisH? U MakE no cents.

nevermind
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Old 09-24-2002, 02:25 PM
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Here's a question.
How can i tell which disc i have in my fmu?
is there some sort of marking inside?
thanx
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Old 09-24-2002, 02:48 PM
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Originally posted by 97blackv1
Here's a question.
How can i tell which disc i have in my fmu?
is there some sort of marking inside?
thanx
You measure it.

4:1 = 1.59"
6:1 = 1.85"
8:1 = 2.22"
10:1 = 2.47"

The Stillen SC kit comes with a 6:1.
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Old 09-24-2002, 07:08 PM
  #38  
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:o)

Originally posted by SprintMax
[B[*]The increase of boost takes five seconds with the clicks of a few buttons on a Boost Controller, while the Supercharger may take over an Hour with the replacement of pulleys[*]The Turbo decrease of boost for say winter time takes five seconds with the clicks of a few buttons on a Boost Controller, while the Supercharger may take over an Hour with the replacement of pulleys[/list=1] [/B]
An hour is a gross understatement for changing pulleys.
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Old 09-25-2002, 12:54 AM
  #39  
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Originally posted by MardiGrasMax


You measure it.

4:1 = 1.59"
6:1 = 1.85"
8:1 = 2.22"
10:1 = 2.47"

The Stillen SC kit comes with a 6:1.
My bad for being stupid, but what do you measure? And 8:1 is safe all the way to 3.25" or 3.125"? I am going to buy the pulley tommorow and need to make a decision. At this time I dont want to upgrade the injectors. So if a 3.125 gets by with 270cc, then I will be fine.

Also one side question, what is the best a/f ratio to be at once I am boosted and want to dyno tune it. Or does it depend on pulley sizes?

Dixit
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Old 09-25-2002, 06:25 AM
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Re: :o)

Originally posted by ptatohed


An hour is a gross understatement for changing pulleys.
No it isn't

LOL

Once you remove the blower a half dozen times you begin to look at the engine bay of NA maximas and stare at the tons of empty space.

It's really weird trying to work on an NA max and just be all out of sorts...

LOL
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