motectransam

There's some criticism on the 5th gen. Maxima not performing upto what the 222hp suggests. It actually does, but since there a finite number of ratios (5 for manual, 4 for automatic), to accelerate the fastest, one has to stay on the top-most part of the engine output curve.

Generally for nearly every modern car, that would be about 5-15% higher than the horsepower peak rpm. If someone has a full stock dyno sheets and gear ratios for these cars in a reply or mail to eric_kang@hotmail.com then I can calculate it for you.

Generally the peakier the motor, the wider the ratio spread, or any combo of above, the shiftpoints have to be made higher. So for example the automatic transmissioned Maxima needs higher rpm shiftpoints than the 5-spd manual.

Look at the power peak of 6400rpm and look at the rev cut placed at 6500rpm. To fully wring out this engine's potential, shiftpoints have to be approaching 7000rpm.

Motor Trend got 15.1@94.4mph on a 5th gen. SE. I estimate sharp drivers in good air can wring out 14.8-.9. We need to start an experimental campaign where somebody is willing to volunteer a 5th gen Maxima for a chip reprogram experiment.

Dinan does tuning for Nissans. If the rev cut was extended to 7000 rpm and the driver shifts at about 6800 rpm (guesstimate), I'm 100% certain that the 5th Maxima will pickup tons. My guesstimate is on shiftpoint alone trap speeds should improve from 94.4 to about 95.5mph. That's about 0.15 second e.t. improvement. Hence sharp drivers of 5-spd models will conceivable run 14.6s@95.5 on stock tires. With tire pressure adjustments (24-27 psi front/45psi rear), I can see 14.5@95.5mph. Dinan's remapped spark/fuel curves will probably solidify these goals.

Automatic model 5th gens will pickup more than 5-speeds since they are wider ratio and they probably shift just below the quoted hp peak rpm of 6400rpm. If stock 5th gen. auto maximas run about 15.6-.9@89mph then with about 7000 rpm shiftpoints, the car should be able to run 15.3-15.6@91mph.

Longevity? This world-class engine can probably zing to 8500rpms in short stints. With a 7000rpm shiftpoint, one can expect a slight reduction in accessory life (alternator, a/c, etc...).

Someone has to find out if Dinan does tuning for the 5th gen. Maximas.

~motectransam
read High Perf. Pontiac 10/97. 14.525@94.06 on a 100% stock '96 Bonneville SLE supercharged on Eagle GA tires (2.09 60', 24psi front, 45 psi rear).

RcticMax

You could just add a couple of these babies to your rocker panels. These, in combination with a NOS system should give you good rotation speed given you've got a long enough straightaway.

djmaxski

Hmmmm, I thought we wanted our cars to stick to the road and that flying was just a metaphor....

RcticMax

"Roads?... Where we're going, we don't neeeeeed roads!"

- Doc Brown

djmaxski

RussMaxManiac

What if you disconnect the RPM reading wire to the ECU and have a aftermarket gauge that reads rpms too the engine, would this let the car rev higher?

punkdork

I'm betting that would throw a check engine light. Also, wouldn't it only work for the manuals? Auto would still shift the same , right?

Paul6speed

Imagine how much faster we would be with a 7200 redline? That would be awesome. Some day...

Pmp-n8a

Future mod?

would a 7200 rpm shift be safe??

MaineI30

http://www.citrano.com/car/pix/88mph2.wav

The intro to my car web page...