I usually dont post posts like this, with the hypothetical what ifs, but with alot of $ I wonder how a car like this would perform. Obviously some things would need to go hand and hand, such as Cams and valve springs, ECU and raised rev limiter, and then with the raised rev limiter to 7000 or 7500 RPM plus the VI the 4.17 gears would really shine. Of course my question is... I read the JWT ECU may cause detonation, and how well would any aftermarket (or even the stock) ECU respond to all these mods?

How turbo/supercharged compatible is this setup?

Nismo8780 did a cartest and projected a car setup like this would run mid to high 13s, at high 90 to low 100 mph trap speeds. If this could be done without juice or boost ahh yea. Of course this is gonna take money. Figure $1200 for the cams, not including install or any other install needs, $600-700 for the variable intake, $500-600 for the ECU and $250 for the gears (plus the pain of droppin and opening the trans yet again). Just brewin some thoughts here incase I win the lottery hehe.

References:
http://forums.maxima.org/showthread....highlight=cams

http://forums.maxima.org/showthread....highlight=cams

http://forums.maxima.org/showthread....ght=gear+ratio

various ECU and VI threads....

 

Those are good questions...I mean I haven't had any detonation problems with the JWT ECU that I've had for like 2 years and the VI which I have had for 6 months now. Will hopefully be adding the cams soon...so I'll know for sure if there is any problems, but from what I understand is that the bigger gearing isn't really going to make a bigger difference. I think that would be something you would notice in a Force inducted car. Just my thoughts though. Personally I run the car to about 7200 when I'm racing...which I can see the stiffer springs would come in handy so you can take the car a little higher. But, I think the ECU, VI, and cams would be a great combo, but don't think the gearing would help too much. Has anybody even done the gearing?? And seen any improvement in faster accelaration or higher speed in different gears???

-John

 

I dont think that anyone has messed with the final drive ratio. With a higher ratio, first gear would be almost useless because of wheelspin. After that the car would accelerate quicker, but top speed wont be the same.

 

I was thinking the same deal on the gearing. Really it only helps out a bit in 5th where if your looking for power in the 1/4, your not really heading to. The cams, when the Dyno's are finally revealed, just might be the thing the Vq really needs to open up its full ( or closer to it ) potential. As many people know the stock setup is very mild but once a more aggresive , but still streetable, setup is used lower 14's or 13's NA might be more commonplace with other basic bolt ons.

SuDZ

 

I just ran a quick CarTest2000 for this...

250HP @ 6500rpm
245TQ @ 5000rpm
4.17 gears

13.7 @ 102mph w/2.18s 60'

Of course, this is all without seeing even a single dyno, though, so take it for what it's worth...

 

Does that program factor in wheelspin? With that 4.17 gear, first gear would produce some major wheelspin on street tires.

 

LSD.

 

Yes, it does. 1400rpm drop-clutch launch.

 

If you dumped it at 1400 rpms, thats not the ideal launch. I believe Neal told me he launchs at 3500 and does a slight slip at the track.

 

Yeah, but hes doesnt have 4.17 gears. It would feel totally different. Even though you'd have less hp at 1400 rpm, gearing would make up for that.

 

2500. VQdriver does those really low RPM launches successfully.

 

Maybe it was Brian who launches at 3500??? I would think that a 1400 rpm launch wouldnt lead to good 60' times. The car would probably bog off the line.

 

omg, i just checked that last reference ericdwong posted and it all looked like hieraglypics to me when he started talking about concerns with the inside of the tranny.

reminded me of my programming concepts class

 

CarTest doesn't have the most advanced algorithm when launching. It's programmed for WOT all the time, so it doesn't know that you can dump the revs really high, back off the throttle to avoid a burnout, and then get on it hard again once you hookup.

This is really the program's only flaw. It'd doesn't effect results too much, but it's something to be aware of

But we're also talking about 4th Gen's here. 4th Gen's have a good bit more low-end oomph than 5th Gen's do. You can still get good low RPM launches on a 4th gen, but 5th gen's require more clutch slipping and higher RPM launches.

 

Where did you guys get the program anyhow? Sounds like a fun one to play with.

SuDZ

 

www.cartest2000.com

 

Thanks.

SuDZ