Folks running Supercharger AND Variable Intake...Please post your dyno charts here.
** Did you lose any low end power?
** Did you have to change any SC settings (FMU disk, vaccum lines, etc)
** Any advice/tips for a supercharged Max looking to install VI (Japan or Middle East)?
** Worth it for a daily driver (not drag racing)?

Thanks.

 

just a suggestion, i would try to either pm, or email iansw. he is one person i know of with this setup. there are probably others, i am sure, but i don't know of anyone else. good luck!

 

I know iansw & MardiGrasMax.
Trying to find out who else & also get a look at their dyno charts.
BTW, I responded to your email earlier today. Did you get it?

 

i just got the email. thanks. you answered all of my questions

 

click here btw, iansw has a dyno of his sc alone on his webpage. also, he has a dyno of the mevi alone on his gd. he has his numbers posted in his sig pic. check it out.

 

** technically no but i can't confirm that yet.
** no but you do need to cut into vacuum for MEVI
** install is not different for s/c max. if you want to install bigger injectors (and a way to tune them), now is the time.
**daily driver? if you s/c a daily driver then why not? You should have less problems with a MEVI provided its installed correctly.

 

This is a bit off-topic, but why do iansw's dynos not show the hp and torque curves crossing at 5250 rpm? Please forgive me if this has been discussed elsewhere.

 

I'm looking at the plot here http://www.vanillaice.com/webmasters...w/iantqhp1.jpg and they do cross at 5250 rpm. I don't know what plot you're looking at. I have seen plots that didn't cross at 5250 before, though, and it confused the heck out of me until I realized the HP and TQ were on different scales. That will throw off the crossover point artificially.

 

This is the dyno plot I found (somehow, now I can't figure out how I got there):

http://www.cyberhub.net/Dyno1.jpg


Your explanation about the different scales appears to be the answer. Thanks.

 

What I'd like to see is a dyno that contains Base SC run (VI off) and compare it with SC run (VI turned ON).

 

Talk to Louisiana Boy... MardiGrasMax

 

By the very nature of the MEVI, why would it hurt the lowend? Or a better question is, "what are the reasons that lead you to believe that it would possibly hurt the lowend?"

 

The Dynos show no difference in low end power, because the MEVI doesn't open until 5000RPM. This was also tested NA by Speedtrip, who Dynoed before he even put the MEVI on, then Dynoed afterwards.

I have an adjustable FMU, and yes, I had to richen up the mixture up top. But the change is minimal, and you may run a little leaner, but probably not more than .5 off.

Same as without the SC. One tip is don't put your boost gauge on the same vacuum line as the MEVI.

Absolutely. I drive my car every day. I've had it almost 6 months, and my car is no worse for wear. Actually, it runs better because I am more religious about maintenance.

As for my Dyno Graphs, the scales are different, that's why it doesn't cross at 5250 - although I've never heard that before. Do hp and TQ always cross at 5250??

Lastly, I Dynoed the following:
1) With the MEVI turned off and No SC - 145hp peak, drops just after 5k RPM.
2) VI on and No SC - 154hp peak all the way to near redline
3) SC and VI off - 231hp peak, levels off at 5200RPM
4) SC and VI on - 267hp peak - Keeps going up to redline.(36hp gain!)

I think MardisGras and I are the only SC'ed MEVI people.

I've done alot of tuning the last few months, and I'm thinking I'll Dyno a bit better in a couple of weeks when I go again.

 

I have the s/c mevi set-up but I havent dynoed yet, but I can tell you the car has unbelievable pull on the top end.

 

you do? you sneaky bastard..

Ian.. Delio and Confused have SC / MEVI setups also

 

Man, Cranman must be pumping those suckers out.

I've streamlined my processes with my supplier, and hopefully I'll be able to get many more MEVI's into the US to the .org members, much faster.

That rocks...there's 5 of us now.

Now if I could just fix my vacuum issues....

 

Yes, because the relationship between power and torque is HP = Torque*RPM/5250, so at 5250 rpm the value of HP is the same as for torque, and the lines will cross if plotted with the same scale for both. The 5250 is a (rounded off)constant that comes out of converting RPM into rad/sec and the conversion factor 550 ft-lb/hp-sec, i.e. 550*60/(2*PI).

 

lol........ya I do, well atually I did, the s/c is in my basement at the moment, I want more boost! So its either sell the s/c and get what you have or get the s/c rebuilt with the t-trim internals, and of course get around to installing my dpi.

 

Mishmosh.. CoolKids.. Delio.. Confused and MardigrasMax were the first ones to have VI's on this board.. those were the first set roadbeast every sold

 

what you mean what i have i am bone stock i swear

 

I was just to about to post that, I think I got mine back in January, or that time frame, it just took me 8 months to get around to installing it, lol

 

yeah its much easier to install now that everyone has write up's and posibilities of things that might go wrong and things to look for..

if you are getting "the thing i have" then you should sell your VI.. its a waste of money to have both.. i havn't said this on the org because everyone will try to flame me but in actuallity.. its better off running "the thing i have" on stock manifolds than a VI

 

Wha? You must be talking turbo, cause iansw shows gains with MEVI in addition to SC. Why would a turbo setup not benefit from MEVI? Or is the thing you have something else?

 

on a Turbo.. the air needs to get to the manifolds as fast as they can.. not as how the VI is setup... that and the gains with a VI are so minimal for a Boosted car.. about 30 hp where as 60 hp on a N/A car.. you also run the risk of loosing mid range power when running a VI and Turbo.. If you need 30 hp on a Turbo car its simple easier to turn up the boost instead of installing a VI.. so thats $0 on a change on your Boost Controler vs $700 for 30 hp from a VI..

now i didn't say anything was wrong on a SC.. because it takes way more than a click or turn of a *** to turn up the hp on a SC.. so the SC car could benefit from the extra 30 hp right then and there.. whether its good for $700 or not? i dunno.. i have seen people buy $500 catbacks for 3 hp..

I think a VI is great for a NA Car.. thats where it shines.. and has show gains of 60 - 80 hp up top.. thats excellent

but again.. this is just how i feel.. so i will sit back wait to be flamed

 

Didnt Nigel just install the mevi? I would be really curious to see what he dynos with the mevi on and off. If the mevi gets 30 peak hp on a s/c max, then to me that seems to a relatively good deal.

 

I have no idea where you're getting your data from, but the VI helps ALL engines. The more air movement at higher rpms the engine makes, the greater the HP increase. A SC car gets more of a benefit than a n/a car, witness Ian's dyno results from earlier in this thread. A turbocharged car would also see an improvement, although perhaps less than a SC'd car since SC'd cars typically have their peak HP (and thus peak airflow) at a higher rpm compared to a TC's car.

What the VI simply does is re-tune the resonance frequency of the airflow at higher rpms to boost airflow into the cylinders at higher rpms. Doesn't mean jack what gismos the car has on it that add airflow. The VI will ALWAYS shove more air into the cylinders at higher rpms than a standard manifold, while providing essentially the same airflow into the cylinders as the stock manifold at lower rpms.

I honestly don't know what you're talking about. If you were being sarcastic, I apologize for my naivity.

 

i wasn't being sarcastic.. and i did say it did add horsepower.. i said.. for 30 hp for $700 its much easier to just turn the boost up on the boost controller..

i did also say it was better use with an SC car than a Turbo car.. i also said this was all my opinion and i did expect people to disagree with me..

 

hoping to be the sixth after I get my new rims,should be nice with a 2.87" pulley, JWT ECU, 370CC injectors and more.

 

Wha!?!?!

There is no 60-80hp gain up top with a NA car.

The peak gain is 10hp, the gain at 6800RPMs is about 35-40hp.
The peak gain on a SC is 36hp, ON TOP of the gains from an SC.

so there's about 4hp difference "up top" between a NA and SC'ed Max, and that's only because the SC keeps the hp from dropping at high RPM in the first place.

Therefore, SC+MEVI is even better than NA, because with NA it doesn't add much peak, with SC, it adds quite a bit. If I could raise my redline to 7500, I could probably get a +50-70hp gain with the MEVI and SC.

www.cyberhub.net/intake
http://www.cyberhub.net/Dyno1.jpg

IanS

 

almost every NA dyno i have seen has about 185 hp 6500 rpms with VI on.. and 125 hp with the VI off...

 

125hp?

 

I get what you're saying, but i would rather have a SC+MEVI than a NA+MEVI for the obvious reasons + the fact that the MEVI ADDS +36hp at high RPM to the SC, where as NA it just levels the powerband off.

And I have seen very few people hit 185hp NA. I'd like you to point me to those Dynos. Not that it hasn't been done, but I'm sure that very few of the MEVI NA people hit that, seeing as most of them are Autos.

IanS

 

Ian you need to calm down.. sometimes you get too excited and you don't read what people type and then you get excited about it..

i never said it was better to be NA + MEVI than SC + MEVI .. i said the MEVI makes more NA hp than SC horsepower..


and the dynos you wanted to see..

Mishmosh

http://forums.maxima.org/showthread....ight=MEVI+dyno

dyno with VI today
1995 SE 5-speed
181.2hp @ 6300rpm, 176.6tq @ 4900rpm



dyno without VI today
1995 SE 5-speed
125hp @ 6300rpm, 150tq @ 6300rpm

thats a 56 hp gain

Mr. Cranman is making 187 hp with MEVI @ 6500 rpms

speedtrip is seeing 40+ hp

182.2 hp @ 6,000 rpm
180.9 tq @ 3,300 rpm
Correction factor = 0.99

1997 SE 5-speed
Cattman Y-pipe
Hybrid Intake
Variable Intake Manifold

Variable Intake manifold shows appreciable gain at 5,500 rpm of 4.19 hp and climbs rapidly to an increase of 43.32 hp at 6,500 rpm (redline). There was also a slight boost in low end however there was an appreciable loss of hp in the midrange. Between 4,300 - 5,100 rpm there is a loss of 3-10 hp with the 10 hp loss occuring at 4,800 rpm. For comparision purposes baseline was with OE manifold, cattman y-pipe, and CAI.

 

No, I'm not too excited, and I did read that.


I guess I just didn't get my point across correctly, let me try again:

30-40hp (let's be generous and say 45hp) gain at 6800 is what you're going to see on MOST Maximas, as most are Auto, and most don't have all the mods some others do. Not 60-80.

Speedtrip's is probably closer to the norm than Cranman, for example.

IanS

 

well based on all the SC dyno's i have seen.. yours, matt, confused.. it seems that an NA MEVI car shows better gains than a SC MEVI car..

and my original argument was stating that it wouldn't be beneficial to a Turbo'd car.. i did say it was ok for a SC car

 

Yes, I get that.

What I'm trying to say is that a SC'ed car by nature levels out the powerband. So buying a SC does for you car exactly what the MEVI does, plus adding the MEVI adds even more hp at the high end of the powerband..

So if you take a SC car, no MEVI
and a NA Car, no MEVI

You get more gains with the SC+MEVI, just the SC does already for you what the MEVI does, (strightens the powerband) + the MEVI adds 36hp (in my case). It's all about the way you look at it.

And I don't know about a Turbo, haven't seen it yet.

IanS

 

nevermind Ian.. i am having too much difficulty as to what i mean by NA car makign more power off a VI than an SC car.. and i am repeating myself in every post.. so forget what i said..

 

4th Gen's are usually putting out 125 hp @ the wheels @ 6500 rpms

with a VI they are making about 170 - 185 wheel horsepower @ 6500 rpms

 

Ditto.

 

Do you mean with a closed VI?