Now that we have all seen the dyno plots and seen the numbers. It's agreed that the variable intake results in less torque down low. Would this result in better gas milage? Am I incorrect to assume less torque means better gas milage? Or does the VI cause a serious inefficiency down low that results in loss of torque and worse gas milage? Very interested in seeing a fuel consumption comparison between the stock manifold and the variable manifold. The comparison would have to be done on the same car to have any value to anyone.

ZuM

 

I haven't done anything scientific, but I get the same as I did before my VI. My driving style hasn't changed, and I still get 18-19mpg in the city and 22-24 on the highway.
-hype

 

I get exactly the same gas mileage as I did with the USIM, about 22 combined city/hwy and 26 hwy. I tend to redline the car more often now as well (maybe 50% more often).

 

my gas mileage has declined a little, but I'm sure that's due to the change in driving style.

 

Thanks for the info guys. So maybe VI helps a little. But it certainly doesn't hurt fuel economy. We really have to find a way to raise the redline without getting a ECU upgrade. I know Dave mentioned this. Is there no way!?

 

JWT ECU. 7200 RPM, not sure if it is the same for the auto ECU from JWT, but Cranmans 5spd JWT ECU equipped 5spd can hit 7200.

 

Does anyone know what would be involved to "convert" a 97-99 back to the 95-96 spec?

 

I have a 97 CA-spec Maxima with a 96 GForce ECU. No problems at all. No codes, nothing. Just swapped my ECU with the new one, that's it.

I do not believe a 99 will work with a 95/96 ECU, though. Quite a few engine sensor differences that I do not believe they are compatible. I'm not aware of anyone who has done it, anyway. Sorry.

 

hmmm... I do not know the differences myself but the general concensus seems to be the 99s, especially SE-Ls, have the 5th gen ECU. I imagine if all the differences could be identified and the appropriate sensors/wiring changed, a swap could be done.

 

I wanted to know if there was a way to raise the rev limiter without getting a ECU upgrade. But since you mentioned it. How is the GForce ECU? I thought some people claimed it gave no gains. How much is it? Have you dynoed with it? Definitely raises rev limiter right? I have a 97 Auto. I don't want to think about the JWT ecu because I don't want the CEL on all the time.

ZuM

 

Nevermind, Just read up on it on MaximaDriver.com. I was thinking of the JET ECU. Damn, I want a GForce ECU now! =P

 

G-Force ECU does not raise rev limiter on either auto or manual.

 

From what I know JWT will not ever be making an ECU for 97-99s, and 99s cannot swap in ECUs from other year Maximas. Many sensors are different, and things such as NVIS will create a major problem.

The only thing that I've seen that might possibly work for us would be the Greddy emanage, but I don't think it supports our engine.
http://forums.maxima.org/showthread....0&pagenumber=2

I would definitely love to be able to tune my A/F as well as increase my rev limiter.
-hype

 

Shoulda got a 95/6 guys

 

Nah, 97 and maybe the 98. Still get the ECU possibility with the better look

DW

 

I wish there was a way to get rid of the rev limiter all together like getting rid of the speed limiter. But I guess that wouldn't really work with an auto tranny. I would guess the car would never shift.