Dyno result (NA w/ a few mods)

[Ponyboy]

FWIW, my NSX dyno'd at a respectable 260.7rwhp and 198.4lbs of torque this last Saturday. Engine mods are Comptech headers, Dali straight pipes, and the Taitec (it's awesome no matter what NetViper will tell you ) GT Lightweight exhaust. Oh, it has the stock airbox and filter element. Now, I'm wondering how much a Dali Hot Chip would + the rwhp and torque.

I should have some video and pics fairly soon.

 

[Ponyboy]

Here's one pic:

 

[NSXTASY_MD]

Nice work ! Those are impressive numbers. What year is your car, it's a 3.0 correct ?

Great pic as well


--- Kevin D.

 

[Ponyboy]

Yes, it's a 3.0, a '91 to be specific. Thanks!

We had to remove the coil pack cover and get a reading from one of the ignition wires b/c I had no idea where the lead inductive wire was located. Homework for next time I guess.

 

[ak]

what kind of dyno?

 

[Ponyboy]

Dynojet with all of the fixin's.

FWIW, my a/f went from 13 to 11 when VTEC kicked in - which means it went rich. Since I'm a newb to this, I'm figuring out if that's good or bad.

 

[NetViper]

, and the Taitec (it's awesome no matter what NetViper will tell you ) GT Lightweight exhaust.

I didnt say it wasn't great.... just that it was not for me... fool!

 

[NSXTASY_MD]

Yes, it's a 3.0, a '91 to be specific. Thanks!

We had to remove the coil pack cover and get a reading from one of the ignition wires b/c I had no idea where the lead inductive wire was located. Homework for next time I guess.

...Out of curiosity what wheels/tire sizes did you dyno on in the back ? They're obviously much larger/wider than stock from the pics angle.....making the RWHP #'s even more impressive (being I'm assuming you were also on stock gearing).


--- Kevin

 

[Doug]

Tire size should not affect HP. It can change acceleration characteristics just like weight, but it should have no influence on the actual HP numbers.

 

[Nimbus]

Tire size should not affect HP. It can change acceleration characteristics just like weight, but it should have no influence on the actual HP numbers.

Heavier wheel will affect rear wheel horsepower figures, but not engine horsepower figures. Dynojet roller dyno measures rwhp.

 

[Arata]

Heavier wheel will affect rear wheel horsepower figures, but not engine horsepower figures. Dynojet roller dyno measures rwhp.

The difference in HP, with a wheel weight difference of even 5 to 10 lbs, is tiny.
I do not know the exact weight of the roller drum on a Dynojet dyno, but I suspect it is at least 2000 lbs. The wheel and roller are being turned by the engine, so now the difference of weight is either 2000 lbs or 2010 lbs, that is a .5% difference. if the dyno is measureing 300HP that is a 1.5 HP difference due to wheel weight.
Some dynos allow you to adjust the wheel weight when you are putting in the run data, you can actually do this with the Dynojet, but it is not meant to be run that way. As it is not easy to do.
The dynojet dynos only read rear wheel HP, if you had an engine dyno, the engine is out of the car on a stand, so no wheels involved.

Edit 10-7 The 248 Dynojet roller is 2700 lbs.

 

[Ponyboy]

It may be a moot point altogether...the rear tire/wheel combination (285/30-18) weighs a little under a pound more than the 91-93 stock setup (225/50-16).

Question for people who've done a dyno before: Did you get the reading while maxing out in 3rd gear or 4th gear? And does anyone know where the lead induction wire is?

 

[Chief]

Tulsa Dyno?

Shawn,

Did you do the Dyno in Tulsa? If so could you let me know where?

Thanks,

Chris
91 NSX
Rogers, AR

 

[Ponyboy]

www.tulsadyno.com

Should you become a member of www.greencountrymotorsports.com you get the following deal:

1 pull for $30
3 pulls for $40
Unlimited pulls for $50
A/F ratio meter $10

We should be doing another group dyno day in the early Spring. Missed you at the Tulsa get together - hope you got your brake issues resolved and hope to see you in a few weeks for our group drive.

 

[Nimbus]

Question for people who've done a dyno before: Did you get the reading while maxing out in 3rd gear or 4th gear?

For 5sp, pull in 3rd gear. For 6sp, pull in 4th gear. That's the closest to a 1:1 ratio in the NSX.