this is just something to add to the whole "maybe the Maxima's HP is overrated" ordeal.

on Hoon's (Irvine78) webpage he says
As of 10/19/01, my horsepower and torque numbers are 204hp and 201ft-lbs torque to the wheel. This is 240hp and 236ft-lbs torque to the crank.

if i'm not mistaken, a stock 2k2 dyno'd at exactly 204HP a few months ago. and notice Hoon's calculations told him that 204hp at the wheels is equal to 240hp at the crank (same HP as the new altima)something doesnt seem to add up. but keep in mind that he has a 5 speed transmission.

this doesnt necessarily mean anything but i just wanted to throw it in there for those who are interested with this topic.

 

Isn't that exactly 20% loss from tranny, etc? Pretty much what I would expect from automatic tranny.

 

Manual: 15% loss of 255 would be 216.75
20% loss of 255 would be 204

Auto: 25% loss of 255 would be 191.25

I don't remember what 2k2s are dynoing at stock so...

 

Well, actually his Max is right on for HP and torque IF he is an automatic and IF the auto looses 20% to the wheels. The problem lies in the way people compute drivetrain loss. I stumbled upon this equation which is used by the Mustang forums, VW forums, Contour SVT forum, F-Body forums, and was confirmed by my dyno shop. People are taking the wheel power X the % of loss + 1.0. Example: 204 fwhp X 1.2 (assuming 20% loss) = 245 crank HP. Instead, you need take the wheel power and divide by 1 less the drivetrain loss. Example 204 / 0.80 (assuming 20% loss) = 255 crank HP. The way I compute it, he's making 255hp and 251 tq. I've been told that torque isn't affected by drivetrain loss like HP is which I find is impossible because a dyno uses torque to compute HP, but I haven't ben able to verify this accurately though. IMO, the auto doesn't loose 20%. It's more like 18%, maybe. Too many people assume the difference in performance between the autos and manuals is mostly because of powertrain loss which isn't true. Most of the loss is from the tall gearing of the tranny. Now that the 2k2 has substainally more torque, there's very little difference in the performance between an auto and manual.


Dave

 

The answer to this question is quite simple.

A 2000 auto Max make about 160-165 FWHP.
A 2002 auto max make about 190-195 FWHP.
So there you have it, the 2002 max's engine produces another 30 FWHP plus you have to add in the added drive train loss of the extra 30 FWHP. This brings the engines out put up too 255 crank HP. So if you think the 2002 is overated then the 2000 is equaly if not a little bit more over rated.


Also the 6spd transmission is not as efficient as last years 5 spd, or so the evidence sugests.

 

. .and that's probably why the 02 Maxima 6 speed is not much faster than the Altime V-6 5 speed.

I'll still take the 6 speed, though

DW

 

Probably