I got my 2K2 stock auto Maxima GXE dynoed for the 1st time. Intec Racing was offerring two free runs. They told me to roll into the throttle so that it doesn't downshift but I screwed up the 1st time cuz I wasn't at full throttle by the time I hit redline. Oops.

Anyhow, 2nd time around I got 195.1 hp and 214.7 lb-ft of torque. Does this sound about right for a stock 2K2-2K3 auto? There aren't a whole lot of posts on this and judging by a lot of the threads (like the "sue Nissan for 15 hp" thread) there's some debate on what the "right" amount is.

I haven't had the throttle hesition (ECU update and MAF replacement) done yet cuz my dumb dealer refused to pre-order the MAF and sure enough he needed it!

Side note: I found it to be weird experience for me since I was so worried that something could go wrong during the run like car breaking loose since a wall was in front of me and I was suspended a couple feet up.

The other thing is that I got to the point where I was beyond the start of the redline and getting worried (but I remember reading the tach reads at least 300 rpm too high). I think I ended up hitting the rev or speed limiter (was in 3rd gear) cuz I felt a slight jerk/jolt while in that red area.

 

It probably was the rev limiter because there is no 3rd gear speed limiter. I would say that's pretty decent for an auto. Post the graph if you could.

 

What kind of dyno was it? On my Dynapack I can't remember exactly but I think I'm baselining my 2003 auto at around 210 whp.

 

195whp and 214 tq seems about right for a dynojet reading on the 02-03 Autos.

 

Figuring 23% driveline loss due to the automatic that put you at 240hp/264tq which is pretty inline with what most people pull with 6 speeds.

 

I wanna ask this to understand something, i thought it was only a 15% drivetrain lost ( i'm mostly into hondas and acuras where it's a 15%). If it was that it would put him at 220 or so, and if i'm not mistaken the 2k2 has like 25 more than that. Can someone explain the reason why it's so much more percentage of drivetrain loss in the max. I'm not understanding, what's the purpose for such a dampering ?

 

Its more of a over rating the HP than anything. The Auto Cracura CLS which is rated at 260hp only dynos at 195 also.

 

15% is the driveline loss for a manual transmission. With the extra pumps an automatic has it uses more hp. The 23% loss I used seems to the the industry average, from the research I've done anyway.

 

It was a Dynojet dyno. Car and Driver in the October 2001 issue (can't find my print issue) did a test of regular vs. super unleaded gas and dynoed a bunch of cars with regular and super. I recall that all the automatic equipped cars had pretty substantial driveline losses. Wish I could find my issue!

 

Answering my own post, I guess what I got sounds reasonable. I found my Oct. 2001 C&D issue. They tested a bunch of cars which did and didn't require premium (some with and some without knock sensors) and reported on the dyno results as well as 1/4 mile time differnces. All had automatics execpt the M3 which they couldn't dyno anyways (due to another issue). They didn't say which dyno they used.

I've listed the results in this format:
car, SAE net hp/gas req'd, wheel hp with reg./wheel hp w/premium

Dodge Ram 3500 Maxivan: 245/regular, 183/190
Ford Mustang GT: 260/regular, 191/193
Honda Accord LX V-6: 200/regular, 151/147 (!)
Saab 9-5 Aero: 230/prem., 164/180

 

That sounda bout right for those numbers. Automatics soak up a lot more power than manual trannies do. My 200hp Taurus pulled 145hp/160tq.

 

Hey cwerdna, glad you made it out to that dyno. Your numbers aren't too far off for an Auto 2K2. That is not to say that those are good numbers, because they're not.

My 2K2 6speed (stock at the time) dynoed at like 205hp, which is too much loss for a Manual tranny.

 

You definitely have normal numbers, though there is something I don't understand. If they truly overated our car, and it is still this fast, imagine how fast it would be if the numbers were right. Because, at this weight, I would imagine it wouldn't be too fast considering what other cars pull with less HP and less weight. Did this people overate the cars also, or is it simply a case where that much drivetrain loss is pretty normal?