currently I have been running the 3.125 pulley on a Stillen V2 s/c kit, and only peaking at 10 psi. I was wondering what numbers some other s/c max owners where getting and where should I peak at once I run the 2.87 that I am currently installing.

PS- in relation to recent thread, my vaccum at idle is -18 lb's

 

peak at 10 is correct with 3.125. how much more do you want?

 

more boost happier I am...j/k, I think the 2.87 pulley is the last step. From there I think the blower just begins to "overspin" (I think thats what they call it)

*anyone else have experience with different numbers on pulleys?

 

overspin? no.

the impeller speed of the v2 is capable of upwards of 55400 rpms.

even with the smallest pulley we're allowed to go. i.e. 2.7ish. that's not even close to 55k.

use vortech's calculator on their website.

 

Ok now that I know overspin isn't a problem all I need to know is how much, if any, cutting needs to be done to the V2 bracket to run the 2.87 pulley? my 3.125 pulley seems to already be rubbing the bracket?

 

email Mardigrasmax and ask him.

 

I will do, but i was just looking for some answers in the forums..!!

 

Ive got a V1 and yes it needed to be cut allot to make room for the belt with the 2.62" pulley. As far as impeller speed goes, with a 2.87" you are over driving the blower, but it is not a big deal unless you race in a road race situation where you will hold high rpms for an extended ammount of time. For drag racing its not spining the impeller at those high rpms long enough for the blades to heat up too much. When the blades get too hot they begin to stretch and will touch the blower housing and cause damage.

Your biggest issue is fuel, with an 8:1 FMU disc I was running out of fuel at 9.5psi at ~6000rpms. The injectors were at 100% and the fuel pressure rising rate wasnt keeping up. You can use a 10:1 disc but you will be pushing over 100psi of fuel pressure, not to mention you will be very fat in the mid rpms unless you tune the AFR on a dyno with wideband O2 using an AFC. IMHO 10psi is about the "entry level" limit unless you want take it to the next level.

 

What do you suggest I do then, I'm running the 3.125 pulley and peaking at 10 psi right now. Thats using the 6:1 FMU disc and a tuned S-AFC. "Supposedly" I'm running the SEMA injectors which I guess are better than stock, and the motors gone through.

So basicly what I'm saying is if I run the 2.87 pulley, and upgrade the FMU disc to 8:1, am I going to cause any harm or even am I going to create more boost?? Would your opinion be to stay at the 3.125 pulley or upgrade??

BTW- I've had this car for a couple months, I bought it off a friend named Phil, (I forget his screen name on here, but he was real big on this board, and starting PAmaximas.org)

 

BTW ....anyone elses info would help..thanx a ton guys !!

 

So you're the one with Phil's car...

 

Ive never heard of SEMA injectors?

INHO stay with what you have.

Isnt it fast enough?

It tuned very well I would assume since it was Phills, but if your going to change the way its set up you will need to have it retuned. At this level its more than a pulley change to make it safe for the long haul. You will need to tune it on a dyno with wide band O2 with an good tuner helping you. If you are going to go 2.87 or smaller put in the one step higher ratio FMU disc when you change the pulley. Then get the dyno work done. Bring the smaller FMU disc with you inceaser the higher ratio was too much and swap it back their. Basically what you are looking at is the motor is on the edge of its limits and it has to be tuned perfectly to stay together. If you chance it and it blows up it wouldnt be worth ghettoing it. Seek tuner help, what about the shop that helped Phil?

 

why don't you ask phil? the car has already run the 2.87 pulley and smaller..

 

I see what your saying now, but the shop that helped tune phil's car on a dyno was when he lived in NJ I believe. And as for the shop that was responsible for the car while here in PA, that would be me and where I do all the work at (Chettes Vettes). The problem is we don't have easy access to a dyno. And second, we don't know exactly what the car has done to it, so I'm sceptacule on going above 10psi. He first claimed it had TT injectors, then when I noticed the injectors were red and looked like stock, I asked him about it. He then claimed they were the SEMA injectors that were from the stock car in japan that was equal to our maxima's but ran ~9psi of boost over there??? He lost me on that one. Second, he also claims its not stock internals, which I can believe and can't believe....hard to because of the lack of info of where,what,how,and why the motors been torn apart (he just sayd its not stock internals). Easy to believe because of some of the gaskets looking only 10k miles on them and it also idles at ~17/18 -psi. Which people have told me isn't correct on stock internals.

What do you know as of color of TT injectors, and anything about boosted jap version of max. or anyone know any info on history of this car.

PS- Phil if your reading this, I will get you drunk one night with jason and get all the info off you!!! j/k

 

smallest the cars run for a fact is whats on it now 3.125, I helped put it on after the 3.33 wasn't enough for him. And he never did run it on the 3.125!!

 

there was a thread a few months back regarding the fastest maxima and it basically came down between don and phil talking smack back and forth. don called phil on the whole upgraded internals thing and phil didn't really prove what internal upgrades or how he did them. phil was really secretive about his engine mods.

i'll see if i can find the link and that may answer some of your questions.

 

Thanx a lot, this should help....BTW while the car is down for a month or two because of a fender bender...I am going to take a close look at the engine and keep you guys updated.

PS- or just **ck looking at the motor and do it the easy way, get Phil drunk on the weekend and have his *** tell me...

 

son.. the car ran smaller than 3.125.. i don't know what he told you. .but it did.. it has run upto 14 PSI.. with witness..

where the hell you think the 12 sec timeslip came from?

 

There is a VQ30DE-T in japan that is turbo stock. Most likely nissan put different injectors in it. It certainly is plausible that you have those injectors and maybe even some of the "internals" phil is and was so secretive about.

 

OK, so the injectors ARE quite possible, as for the internals...I'm still looking for some history and info.

as for a 12 second time slip...and 14psi, my doubts are high on the 14psi, mainly because he told me it was now peaking at 16psi when he sold it to me. First day on the road, I only had it peaking at 10psi...there has still been no explanation for that!! As for a 12 second time slip, I don't know....I do know that the car used to have a shot of NOS, not sure how much...but it currently does not.

I do also know that the car ran ~14.0 1/4 mile w/ no traction here in PA, I think Dex, was there for that run. (on 3.33, pulley)

plus, the FMU disc currently installed, could not possibly put out enough fuel for the 2.87 pulley

 

after debating and researching,(and with winter coming up) I think I might just put the car back together and keep the 3.125 pulley, and deal with the 10psi.

I also can't take the chance of destroying any internals with 13 psi on the 2.87 pulley. I need to be more sure of what internals I have first!

 

Mmmmmm...... 2.87" pulley.

 

you have VQ30DET internals .. they were installed in Stamford CT.. at an undisclosed shop the compression on the engine is currently 9:1 .. it has TT injectors and VQ30DET cams.. which isn't that much different from VQ30DE.. the car also has a JWT reprogrammed ECU to compensate for hte Larger Injectors and lower compression.. The head gasket is from the VQ30DET also. The car has the VLSD tranny from the I30t.. go read the tranny casing if you want to find out for sure.. the Car is also equipped with S-AFC to lean and richen the mixture at certain rpms to keep the car from detonating..

 

Thanks for the reply, Philililip.

 

 

what color are TT injectors?? I may be wrong, but I don't think they are red..

 

what are you trying to say...besides the fact that my (phil's) injectors are RED not purple. So therefor they are not TTZ injectors, maybe vq30det injectors...but i don't know how to check........as for the internals, I keep hering different stories!!

 

Didnt you say he told you that you had SEMA injectors? Dont know why he would say that if you had VQDE30-T injectors?I think that those SEMA injectors are just balanced and blue printed stock injectors. Phil did sell the car cheap for the work he had done to it, maybe he sold the engine separetly to someone else? As for him saying he was hitting 16psi peak when he sold you the car, are you sure thats what he said? because with the 6:1 disc that is 113 psi on the injectors, which is probably over the safe limit on our stock injectors and I would assume that would be true for most stock nissan injectors, but still entirely possible, but what cause me to question that is that I never heard of anyone getting that much boost out of either the V1 or V2, even with the 2.67 pulley, which is already over spinning the the s/c, unless say he had an impeller ungrade like 130krab, but I think he would have told you that since it would be a definite selling point??

 

My 370cc inlectors are grey and they are from a 96 300zx tt

 

ok, thats what i thought...so the injectors I have are def. not TTz injectors!!

 

You have it backwards the 95-96 fit, the older ones dont.

 

First off, I wanna make it clear that I am not calling BS on Phil, on his internals yet. I just want to get to the bottom of what exactualy is done.

Second... I think some people are missunderstanding me about the injectors.

* Phil told me that the injectors that were in the car are the TTz injectors. So I looked at the color of the injectors and they were red. I went back to Phil and said "phil, whats up with this, I thought the TTz injectors are grey", his response was "they are not TTz injectors...they are the cima injectors" (I guess he ment cima meaning vq30det)

-so all I really want to know is what size my injectors are, to clear all this up, I'm gonna pull one, clean it, and post a pic!!!