Took me forever to scan, but here it is. I welcome comments, cause I am not sure what the curves should look like. They don't seem very smooth and the HP rises fast, but falls off quicker that some other dynos I've seen. We dialed the dyno shutoff at 6500 rpm, All three runs the car limited out.

maxima.cardomain.com/id/ehughes

 

Man it took a dive after 4500! hehe

 

Something looks amiss, the 2k2's torque curve is supposed to be flat. If i didn't know any better it seems the Stillen intake is actually impeding airflow to the engine thus the sudden dive above a certain rpm.

 

Thats a pretty good HP of 197.4whp. But what I dont get is why does it begin to trail off at 4800 and yet the torque continues to its peak. I thought the peak HP would be more around 5500rpm.

Dixit

 

Guys, look at the scale for the plot. The y-axis range for HP is 160-200 as opposed to the typical 0-200 that we would expect to see. Torque range is also skewed. Makes everything look steeper than it actually is.

The plot is erratic to some degree, but that's likely just dyno noise amplified by the tight axis ranges. The plots we usually see also have a smoothing function applied to the plot to remove some of the noise. This plot likely has not had any smoothing performed.

Those numbers correspond well with other 2002 dyno plots we've seen. Just under 220 ftlbs at the wheels and just under 200 HP. I still don't understand why the HP for the 2002s is so low. Maybe Nissan overrated the engine, or maybe the drivetrain losses just become really high at higher rpms due to the increased torque. Regardless, the 2002s make tons of torque. A mild increase in HP over the 2001-pre's coupled with a large increase in torque will make the 2002's much quicker than the 2001-pre's. That all that matters in the end.

 

I will see if I can get a 0-220 axis print out.

 

don't forget the drive train loss on the auto 2k's are as high as 28%.

(dyno 160 for 222 crank)

 

I would love to believe that, but 274 HP at the crank is dream'in (for now). 25% loss is 263 HP and is more realistic. But 25% loss to get 218 TQ at the wheels means 290 ft.lbs. of TQ...That seems high.

 

The new VQ seems to put out more torque than rated as verified by several dyno runs by several people. Consider it a gift from Nissan

 

Now tell Nissan to give you the 255HP you bought.


Dave

 

nice. you look like you made good max power but my intake looks like it holds the power much better. i have almost peak torque numbers for 3k rpms and my hp doesn't traill off too bad.

 

good torque!!
but what the hell happened after 4,500rpm?
my dyno curve for both hp and torque was just two smooth lines shooting up until they reach their peak(max power @6,400rpm and max torque at @4,400rpm)...

 

in what gear was the dyno performed?

 

they pick a gear closet to 1:1 ratio..
they should be doing the dyno in 3rd gear in Maximas..

 

3rd in maxima autos adn 4TH in standards.

 

I don't know what gear he was in on the dyno. I was watching from below. However, I will find out. If he did it in reg. drive, would that account for the dive in hp at the higher RPM's?

 

 

if it was done in a lower gear than 3rd.....it could explain the reason that the torque seems inflated and why the hp seems a little low.

 

My guess is that it was done Drive. I remember hearing the shifts from 1-2 and 2-3. Once the car shifted up, he nailed it. So another shift could have happened...OD? I also remember him saying the car downshifted late on one run.

 

Come to think of it, the hp/torque does seem like it was run in the wrong gear. Mine was done in 2nd and i have a pretty close HP/Torque curve and number as you do.

 

Soundmikes says you have similar results as his run in 2nd, so i have a strong feeling when the tranny shifted to third and he nailed it, it downshifted to second.

 

That shouldn't happen though, if i'm not mistaken once you take the shifter off 4th (or OD) then it remains in that gear until redline/cut-off or when you up/downshift.

 

ya if he was in third and floored it and it didn't downshift then it was done in third. i'm sure it was done i third. cus i know mine were done in 4th in my 6-spd and i got similiar numbers.