I have been doing alot of thinking with respects to which direction I want to take my "all-race" NA 4th gen. Right now the way it sits is as a strippd out '96 SE 5 speed with pop charger ram air, Budget Y, UDP, and ACT clutch. The engine has around 35K on it and the tranny has about 30K on the rebuild. I want to stay 3.0 so that I can chase the fastest VQ30 title. I have been thinking alot about what upgrades I want to do besides weight reduction. I am more than likely going to go with the 4th gen lower and '00VI upper combo, and adapt a pathfinder TB.

Now before I go any farther, i want to say up front that I am no expert on what I am about to talk about. just tossing around ideas, and trying to gain feedback.


I am thinking about trying the following setup if I think I can get fair gains.
370cc injectors
Z32 MAF
SAFCII

I know the injectors flow, and the MAF meters about 50% more than stock, which should compensate for each other.
Just give thought on this. Good or bad.

 

If you aren't maxing out the stock injectors/maf... what's the point?

 

perhaps none. that is why I am asking. Also why i prefaced by saying that I was no expert on the subject. Do the factory fuel curves leave anything to be desired?
Also could you not get about the benifits of a JWT programmed ECU with a SAFC and J&S? I knowyou would lose the higher rev limiter, but seems you would gain tons of flexibility.

 

SAFC can't adjust timing. Just fuel?

 

That is why I mentioned the J&S.

 

J&S can't adjust timing either. Emanage can retard but cannot advance.

 

really? so is reprogramming the ECU our only answer for advancing timing?

 

Or standalone

 

which would be more expensive, and have a huge margin of error.
Thing is I will be able to run more timing advance than most since this is a designated track car. I wonder if TS can do a 100+ octane program.

 

The SAFC will affect timing. Timing is set by the ecu based on throttle position, rpm and maf voltage. If the SAFC is used to make large enough corrections to the maf signal, then the ignition timing will be affected.

J&S retards timing based on detection of detonation, and can also retard timing based on boost pressure.

 

For NA purposes, a GSS342 255lph HP Walbro would be plenty.

Buy yourself a SMT6 off eBay for $250ish, toss in some race gas, and advance the timing yourself. You'll need the JWT ECU for the raised limiter though.

 

Does the SMT6 adjust cam or ignition timing?

 

No, ignition timing. Those piggy-backs I listed intercept the crank and cam signals to the ECU and fool it into firing earlier/later, so you can indirectly advance timing.

eManage can't.

 

hmm interesting. I wonder how much I can tweek out of a stock VQ30 on race gas.

 

Ice, do you know if this will work in conjunction with a J&S? Use the SMT to advance timing, the J&S to pull timing back if detonation occurs.

 

Yes, it should, in theory, but John should confirm.

SMT6/SMT7 intercepts on the INPUT to the ECU and the J&S intercepts on the OUTPUT to the coils.

 

I'd say 25+whp on 110+octane easy, since TS/JWT can get 10whp or so out of 91-craptane.

 

Everyone's definition of a race engine is different. You mean 1/4 mile or road course race engine?

 

Do you think that is an effective way to change timing?

 

1/4 mile sorry. To me a road racing Maxima is an oxymoron.

 

does anyone have any experience tuning an SMT6?

 

Not here, Altima/350Z guys supposedly have a few.

 

 

Honestly, just a guess, but after seeing what SR20DEN gained just tweaking AFR on his car during lots of dyno pulls, I'd say ballpark easy.

 

I continously preach this to everyone that has a VQ35. Proper tuning is essential, even on a car that is otherwise 100% stock.

 

I know JWT can set up an ECU to run on both 91 and 110 race gas and switch with the flip of a switch. I was thinking about getting it, but it would require a fuel cell, and I don't wanna deal with that.

 

What about running a 95-octane or so program with water/alcohol injection instead?

 

well with a 95 program it will not advance timing wnough to make the water or alchohol injection do anything.
Now if you were running a 100+ program you might be able to run it on 93 and water or alchohol injection.

 

What?

Basically, whatever the overall ocatne rating ends up being 95, 97, 100 is probably pushing it, have JWT program the two maps to accomodate pump gas and WI. They do this on SERs and it's quite effective.

 

Maybe

 

Somebody needs to get the ball rolling...

 

hop to it...

 

Its been about 3 months for me, need to get it 100% working, someone else got one today and he is smarter than me so his should be in today or sometime soon.

But it does work, I had had it in and working(no tuning cuz I don;t know how)

 

eManage for me.....