First I don't want this to become another Dyno vs Dyno battle or discussion on my AFRs. I will be having the car retuned at SGP in Houston when I return to the states. Please only post info that is useful. Thank you.

I've been playing around with some math and my DynoJet numbers. Going off of a 1.23 CF for elevation I made 487/414 & 398/338 uncorrected. I beleive most dynos use a 1.02 CF at sea level. If that is the case I took 398 x 1.02 = 405whp & 338 x 1.02 = 344wtq (405/344 w/ 1.02 CF). Also this is on 6.5psi (6.7 peak) per the UTEC reading. Which from my understanding is the manifold reading.

Performace/Power Mods:
- JWT 700BB Twin Turbo System w/ HKS SSQV BOV & Swain Tech BBE Coated FMIC
- Koyo Racing Radiator
- Cosworth Intake Manifold
- UR Underdrive Crank Pulley w/ Gates Belts
- DeatschWerks 600cc Injectors
- NGK Iridium IX 1-Step Colder Spark Plugs
- Stillen Oil Cooler w/ Thermostat
- Walbro 255lph Fuel Pump
- APS 2.5" Test Pipes
- Stillen TD Cat-back ZR Single Tips
- TurboXS UTEC
- TurboXS Tuner Wideband w/ Bosch O2 Sensor
- TurboXS DTEC Map Sensor
- Perrin Boost Solenoid

Transmission:
- JWT Clutch
- JWT Flywheel
- AP Stainless Steel Clutch Line

 

That sounds like a more reasonable amount for that boost level. Still impressive.

 

I think what would be helpful to clarify is whether the psi reading is based off of a 14.7 atmospheric baseline or off the baseline at your current elevation. It sounds like it's based off a 14.7 atmospheric baseline, which would mean it's already corrected for elevation since you don't live at a 14.7 baseline. In other words, the compensation is already built-in and no additional dyno CF is needed.

If you recalibrate the MAP sensor for your elevation, I think 6.5 psi would net you less power, in which case a higher CF could compensate.

... just a guess

 

Since I did not do the install, nor home (USA) when the install was completed I can not tell you if it was recalibrated or not. However... I'm gonna go out on a limb and say it was not. I do know that due to elevation we usally run between 1 to 2 psi more than at sea level.

 

Uncorrected is the "truth", what more do you need?

 

I agree.

 

Ok......

 

CF doesn't have anything to do with elevation, well not directly at least. It is used to compensate for variations in humidity, temperature and barometric pressure. This enables numbers from different cars, places, climates, etc. to be compared and reasonably accurate.

CF of 1.23 is completely absurd. That means that the numbers are 23% higher than the uncorrected numbers. I haven't seen a legitimate CF of higher than 1.06 or lower than .97. CF of 1.02 is very reasonable.

As for uncorrected numbers being the "truth", I would disagree. Uncorrected numbers merely represent what a vehicle put down, that day, at that time, in that place, on that dyno, under those conditions. IMHO, that's hardly representative of the car's true power.

CF should be preset on a dynojet anyway. There are 4. SAE, STD, DIN, and EEC. SAE should be the default and adjusts the CF automatically based on current weather conditions at the dyno. If a dyno operator or shop is putting in correction factors manually I would be very skeptical about the integrity of the numbers.

Hope this helps.

Edit* After re-reading your post I'm not sure I answered your question. It's possible that the weather station the dyno uses to adjust the uncorrected numbers to SAE is not working properly. It is also possible that the shop has gone in and adjust the conditions that determine the SAE correction factor. ie, instead of temperature being corrected to 70*F, they changed it to 60*F, which would give higher numbers. The same could be done for humidity and baro.

 

Elevation effect barometric pressure.

PLay with this; http://www.slowgt.com/Calc2.htm#BasAltCal FYI: For N/A cars.

 

Yes, that's why I said, elevation doesn't directly affect it. It does affect the barometric pressure, which in turn effects the CF. Sorry, thought I was clearer.

 

So 6500' above sea level is elevation... And elevation effects barometric pressure... Barometric pressure effect horse power... Therfore in short elevation effects horse power. LOL

 

We're saying the same thing. LOL.

 

The only way to reason with stupid people is to get down to there level and beat them at there own game.

This thread wins.

 

We should have a dyno thread sub forum, so we can what if it to death.

 

Your becoming to be one of my favorite members on the forum

 

You're right... Why I made this thread to explain to others.