Dyno result

Smoothaccel · 3 March 2002

Hello everyone, I have been reading the messages posted by you all for about 1yr now and this is my first time posting a message.:

I dynoed my 92 NSX and had a peak HP of 228.5 and peak Torque of 181.7 at room temp. I know that from the factory there are usually +/- 10 hp in cars. My question is: I am in colorado and was wondering if high altitude affects these numbers? Has anyone dynoed their NSX in the Denver Boulder area?

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David Allen · 3 March 2002

I'm in the Boulder Area, but I have not dyno'd here. I do have a dyno from Phoenix, so it would be interesting to compare the two. Where can one get their car dyno'd around here?

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David Allen
'00 Silverstone NSX-T
Comptech SC, Headers, Intake, Exhaust & a little Mark Basch tweakage

Smoothaccel · 3 March 2002

There is a place Between Ft Collins and Loveland, across from "Tynans Nisan" called PFI they do 3 runs for $50.
I do not have their Ph# but I am close so I can get more info if you want to dyno.

ScienceofSpeed · 3 March 2002

I would expect that the higher elevation of Colorado would have an impact on the car's performance.

THe dyno shop should be able to provide estimated results with sea level correction for air density.

-- Chris

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http://www.NSXClassifieds.com - free NSX classifieds site!

grippgoat · 4 March 2002

What kind of dyno was it on? "Mustang" dynos tend to give quite low wheel figures.

-Mike

Smoothaccel · 4 March 2002

Mike, it is from an import shop so don't think it is a Mustang dyno and I think the name is "Power House"
---------Vance

grippgoat · 4 March 2002

Mustang is a dyno brand, which AFAIK has nothing to do with the car. Anyway, my car last summer turned 238hp on a Mustang dyno. Then last winter on a dynojet, it turned 268hp.

-Mike

mdoan300 · 5 March 2002

Originally posted by Smoothaccel:
I dynoed my 92 NSX and had a peak HP of 228.5 and peak Torque of 181.7 at room temp. I know that from the factory there are usually +/- 10 hp in cars. My question is: I am in colorado and was wondering if high altitude affects these numbers? Has anyone dynoed their NSX in the Denver Boulder area?

High altitude will affect power unless you've got forced induction to compensate. Higher altitude = thinner air = less power.

If you're wondering why your numbers don't match the stock numbers, chassis dynamometers measure hp at the driven wheels and not at the flywheel. There is a % loss from the drivetrain.

Michael.

Roy · 5 March 2002

I have been told that the Mustang dyno reads lower than the DynoJet, but that the Mustang also produces more accurate numbers.

If you start with 270 bhp at the flywheel and have 15% losses through the drive train, then you would have 230 hp at the wheels. Significantly higher numbers are not credible for a stock 3.0-liter engine. The Mustang dyno technician that I talked to suggested that you compare ¼ mile times measured vs. those calculated on sites such as www.prestage.com. He said that most people want high horsepower numbers more than they want accurate numbers.

On a Mustang dyno that had just been calibrated, my car measured 317 rwhp. That translates to about 374 bhp at the flywheel. For mods, I have Mark Basch’s old Comptech supercharger, high boost pulley, and larger injectors. This Mustang unit has a built-in weather station to measure air temperature, humidity and barometric pressure. There is no additional “normalization” required.

Using prestage’s computer it indicates a ¼ mile of about 12.32 sec and 111 MPH. That seems consistent with Attitude Adjuster’s results of 12.37 at 114.12 (see Track Talk and Race Reports on this forum), with the Comptech high boost, other things being stock.

Last year I asked this fellow how many horsepower he had in his Type-C Jaguar. He was non-committal and said that people like to exaggerate their horsepower and sexual prowess.

BryanZublin · 21 March 2002

Originally posted by Roy:
(snip)
This Mustang unit has a built-in weather station to measure air temperature, humidity and barometric pressure. There is no additional “normalization” required.
(snip)

For any hp measurement to be useful for comparison purposes, it HAS to be corrected for standard atmospheric conditions of pressure and temperature (I believe sea level and 25 deg C). Otherwise I could dyno my NSX on Mt. Everest, install Dali's new exhaust system, and then dyno in Death Valley in the winter and show a HUGE horsepower gain.

The DynoJet plots usually list both the measured peak and corrected peak horsepower and torque.

Bryan Zublin

[This message has been edited by BryanZublin (edited 21 March 2002).]

Khuang · 21 March 2002

You dyno # should already be corrected for the elevation, check your dyno and correction factor.

Originally posted by Smoothaccel:
Hello everyone, I have been reading the messages posted by you all for about 1yr now and this is my first time posting a message.:

I dynoed my 92 NSX and had a peak HP of 228.5 and peak Torque of 181.7 at room temp. I know that from the factory there are usually +/- 10 hp in cars. My question is: I am in colorado and was wondering if high altitude affects these numbers? Has anyone dynoed their NSX in the Denver Boulder area?

Dyno result

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