Would that combo make more peak boost (assuming stock pulley) than with the normal 6500rpm redline? We're assuming this car has an MEVI as well, hypothetically of course

BTW Matt how much does a J&S Safeguard cost

 

Doesn't Ron (I30krab) have a 7200 rpm limiter? No MEVI unless I"m wrong. But last time I believe he mentioned that his redline was 7K or 7.2K, can't remember.

 

Yes, it would make more boost because the SC would be spinning faster. I'm sure you could do the math and figure it out...

Hypothetically, would you install it yourself?

 

Confused has it... 7K rev limit, MEVI, 370cc injectors, etc.

 

Hypothetically speaking, yes this person would hypothetically install it themself.

 

Does this hypothetical person have a hypothetical time frame in mind?

 

Within the next few months if this person decides to take that route.

Hypothetically

 

Of course.

 

you won't need the j&s with a jwt ecu s/c program and stock pulley.

 

hypothetically, it would be much cooler and original to do a full N/A build.. Especially if this hypothetical person were concerned with reliability.

 

Neal, The peak boost would probably go up ~1psi but the benefits of wringing out each gear would be the best aspect of an extended redline. The JWT SC program pulls too much timing and the torque suffers. A stock ecu with an extended redline only is what I would like if at all possible and hypothetically you wanted to run a sc. I have a 3.12 with MEVI and I prematurely shift @6200 all the time because if I stretch it just 200rpm too long I hit the fuel cut at around 6700. It comes up fast and just having the extra 300-500/7000-7200 redline would give me a much better highway pulling capability. The tach needle actually reads around 6900 when I hit the fuel cut with my stock ecu but my safc reads ~6700 as a peak figure. I would use the JWT program with a z32 maf/370inj and turbo instead.

:

 

without an intercooler setup and assuming JW does not pull any timing on the ECU the car would pull hard since boost keeps on building. If you want more info go to the DYNO discussions and youll see what I am talking about. With that JW ECU combo as allgo stated you lose some torque.


Since your all motor I highly recommend that Fidenza flywheel. Try it I bet youll hit 13.4 or below. Trust me on this one.

 

I kinda feel that more boost a lower rpms is better, torque!!! So upping the rev limiter with a SC means that peak boost/blower rev limit will need to be at 7200, soooooooooo in order to do this you will need to run a ~3.0 or so to stay under ~55,000 rpms. The result is that you will have less boost at lower rpms than if you were to use a 2.62" pulley and a 6500 rpm limit. What does this mean? Well IMHO from stop light to stop light the higher revlimit is a disadvantage due to lower boost at lower rpm. But at highway speeds it would be an advantage. For 1/4 mile, I'm undecided what would be better. For a fuel issue I am considering a JWT ecu with a 6500 limit. Remember you will be pushing 400-450whp with a 3.0 & 7k limit, but you can get about the same power level using a 2.62 and a 6500 limit. The lower limit is allot less abusive, when you beating on your motor this hard it could be an issue to have a 7200 limit. IMHO

 

My thoughts exactly. I'm no S/C expert, but with the extra boost AND the raised redline stock internals would be under a lot of stress. The ballgame is quite different with FI/VI than NA/VI.
-hype

 

delio is right, check out Confused's dyno, he has all of those mods, and makes great power (322hp) on the 3.33 pulley.

dyno http://www.confusedmax.com/dyno/dyno-17.htm

 

Hypothetically this person should be in the 12's if he where to supercharge his car...

 

So if one were to bolt an SC with the stock (3.6" I believe?) pulley on their car with a 7200rpm limiter that person would see what, about 7-7.5psi at the 7200 redline? And would NOT be in danger of overspinning the blower until he went below a 3.0 pulley size?

Now, what about using the stock SC pulley with a JWT N/A programmed ECU. On stock injectors. Would the timing be too advanced/fuel be too lean? I would assume stillen's SC is not running on the verge of detonation on the stock ECU so I'd hope that there is a little leeway to be had here.

 

You'd be in the ballpark of 45250 RPM with the 3.6" pully, which is well below the limit. You'd be around the 50,000 limit with a 3.25" pully.

 

If your using the boost referenced FPR that comes with the kit, then you'll be overriding the ECU's programmed fuel curve. At least you can enrich the mixture depending on what calibration disk you're using. I'd be worried about the timing advance, though.

 

I believe that stock timing of 15 btdc is advanced to beyond 20 btdc at times with the NA program and the leaner maps at wot that JWT changes surely wouldn't be ideal for sc or any other fi. Even with a safc or another maf altering device it would be kinda ****-ty. It would be very nerveracking to hit full boost and get hard detonation @~7200rpm. You may just want to get a stock ecu for boosting and sell the JWT to some NA Freak

 

There's another guy considering this mod, hypothetically.


Dave

 

 

Me too.

 

Guess what man, after looking at this post I am going to install a MEVI on a boosted maxima running the 2.87 pulley, intercooler, 300Z injectors the JWT ECU with the 7200RPM limiter. I should be doing this car this saturday. What do you guys want me to do to fullfill this answer, take it on a test drive and video tape the boost gauge or what?

I am not joking I am going to install a MEVI on this dudes car and he threw that at me and I was not thinking about this until today

 

So is it or to be fast but furious cause you **** didnt hold together for more than 5k?

 

I'm considering the basically the same setup as Neal. I'd run the stock 3.6" pulley with the MEVI and JWT ECU 7000rpm (SC program or stock program). I think the MEVI with the 7000rpm limiter will make the Maxima a beast

My issue is the money. Do I really want to spend $4000 (SC, good BOV, gauges) on a 7 year old car that I love or do I want to spend the money and buy a new car (WRX) which I'll have to get a loan for and probably won't be able to modify for quite a while. Time to start a poll

 

Huh?

 

Before and after dynos!

 

ooh ooh you go SCed route and your hitting those low times NA, with a blower the way you drive you should be in the 12's. At the meets I was told to hand my keys over to you and the way you drive youll get better times then myself. Of course you know how to drive way better then I do, that I will admit.

About the Dynos, that car is not my car and I highly doubt the owner is going to do before and after dynos, I dont car he cares for that since the car is much more blown then my is.

 

Well this is an easy question to answer. The quintessence of RPM is all related to the theory of car consalence. So therefore, it would be impossible to do as you have a proclaimed. However, if you ponder long enough you might be able to do a SC kit with a 5000rpm rev limiter?
However, even that can be limited. If you decided to do it, make sure you drink lots of water.

 

I realy dont think the 370s even with a TT MAF will support a 2.87 @ 7200rpm with MEVI and free flow exhaust. I put down 380whp with 15psi @ 6400rpm, with MEVI, 3" EX and alch/WI(more fuel)using an FMU set up. The math show the 370cc JWT set up only to be capable of 424bhp or ~360whp, using 95% duty cycle, .55bsfc, and assuming 15psi of boost into the 1:1 regulator resulting in a raised fuel pressure of ~58psi. These assumptions are all realistic, IMHO. I just dont think it will run for long of you try and make more power than the injectors can provide. I think the 3.125 or custom 3.0 is a better choice for the JWT 370cc set up.