Normal for higher altitudes?

M

Miracle

New Member
Feb 10, 2007
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#1
Got the Mustang dynoed at D&R Tuning here in Colorado today after work.... here are the results.

Peak HP: 289.68 WHP
Peak TQ: 298.02 Lb/Ft.
Amb Temp: 48 Deg
Peak HP RPM: 5225
Pk Trq RPM: 4876
Gear: 3rd
Start RPM:1800
End RPM: 5800

These things are rated at 300 HP and 320 TQ at the crank stock. So with the altitude up here, along with my few performance parts, I am getting near stock numbers at the wheels.

But honestly, does the altitude (~6100-14000 ft.) make that much of a difference? I understand that the oxygen is thinner up here than back home in Tennessee, so I would ASSUME so.
 

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#5
Yeha... I believe that the dyno they had was a Mustang Dyno, 2WD. I have heard they read a bit high anyways... but like you said, every dyno is different.

When I had my Turbo Eclipse, I dynoed it 6 times (6 pulls), 2 different AWD dynos, in 3 days and got anywhere from 310 to 318 WHP. So yeah. :)
 
#6
That's actually pretty consistent numbers. Were they the same type of dyno? Mine are done on a Dynomite, which is set up for AWD. It's a pretty cool setup. I had never seen an AWD dyno before the shop got this one. Their 750HP Talon is crazy.
 
#8
I'm pretty sure that of the numbers where correct (correctly) to SAE then it would take into account the altitude, DA, humidity and temp. This means the numbers you achieved should be reproducable at a lower altitude (same dyno type) when also corrected to SAE.

If they are STD numbers then there may be something else.

But based on your 290rwhp and using the 15% rule (which is not 100% accuatre but will surfice) we can guess your car is making 340-342bhp SAE Net (that's at the engine). So a pretty decent hike over stock. :D
 
#9
They do correct for altitude. I'll have to dig up my sheets, but at one of the two places I dynoed here in Colo., they had both the actual and SAE corrected numbers. We lose a LOT here because of the air...I believe it was over 50 rwhp difference.
 
#10
kooldawg6 said:
Those are pretty impressive #s for high altitude and little mods.

I love watching the videos on the net of 1000+ HP cars on the dyno as they smoke the tires on the rollers:eek:

Scary footage here...1000+ HP Skyline
http://www.youtube.com/watch?v=e6nA0vh7wGg
Click to expand...

Last time I was at the dyno they had their 750HP Talon on there, and they had put a new downpipe on it which melted the strap and the car slid off the dyno around 5k in 4th. That was freaky. Once you realize the car won't go anywhere if it does fly off, it's not as scary. But I jumped. Plus the car is crazy loud. It makes mine sound like a fly's fart.

Here's a pass at Cordova. 10.16@146
http://videos.streetfire.net/video/48d59a07-82f6-4888-8d63-997b000d4f7a.htm
 
#14
CANTONRACER said:
Guys, he asks a good question and I see a video of a skyline...which has what to do with the question.

Altitude kills performance. That is why boosted cars rule at altitude...they create their own atmosphere in a sense.
Click to expand...

Settle down. In our own ways, we already answered his question. 300BHP clearly answer his question, and advised him that the numbers were already corrected for his altitude. It's a message board... sometimes people get off topic. Tell me you think about the same thing for more than 2 minutes without a different thought popping into your head. We're guys, that's how we think.
 
#15
Miracle said:
Got the Mustang dynoed at D&R Tuning here in Colorado today after work.... here are the results.

Peak HP: 289.68 WHP
Peak TQ: 298.02 Lb/Ft.
Amb Temp: 48 Deg
Peak HP RPM: 5225
Pk Trq RPM: 4876
Gear: 3rd
Start RPM:1800
End RPM: 5800

These things are rated at 300 HP and 320 TQ at the crank stock. So with the altitude up here, along with my few performance parts, I am getting near stock numbers at the wheels.

But honestly, does the altitude (~6100-14000 ft.) make that much of a difference? I understand that the oxygen is thinner up here than back home in Tennessee, so I would ASSUME so.
Click to expand...

Everyone hold on a second...

Is your car a manual or automatic? Was your dyno pull done in 3rd gear as you said above? That matters big time...

Those numbers are high for a SAE corrected Mustang Dyno with those mods. The fact that these numbers are from a Mustang Dyno has me thinking that either the Dyno was calibrated wrong or your car was done in the wrong gear. If your numbers are true, you gained about 50 RWHP with an exhaust upgrade and a tune...


Altitude affects FI cars, just not as much as N/A cars. When I had my fox mustang, it was making 700 RWHP at 1800 feet above sea level and was running mid 9's. When I moved to Calgary at 6100 feet above sea level the car was running low 10's and was making around 670 RWHP. My 92 TBird at that time went from running low 16's in the quarter @ 1800 feet to low-mid 17's @ 6100. That car was never dynoed.
 
#16
Gear does not matter. I did back to back runs in 3rd and 4th gear both in my manual and the results were the same. Maybe it's because I have 3.31's, but the results were the same. And where are you getting that he gained 50HP? Nowhere did he say what his stock number was. You CANNOT assume his stock number.
 
#17
Let's just put it this way, Stock 05+ Mustang GT's put down around 230 - 245 RWHP SAE corrected on a properly calibrated Mustang Dyno. This car is making 289 RWHP on a Mustang Dyno that may or may not be corrected.

DarkFireGT what type of Dyno was your dyno-run done on? It sure as hell does matter what gear the car is in for a Dyno-Jet and Mustang Dyno...
 
#18
I do all my runs on a Land and Sea DYNO-Mite AWD/FWD/RWD dynamometer, the same one seen in the video I posted. The first few times I went they were done in 4th gear. Last time I went, the guy said he was going to use 3rd gear. He also has an '07, so I trusted him, but after my run in 3rd, I asked to see 4th. The result was within 2HP.
 
#19
That is fine and dandy but I have seen the results of a car in 3rd and 4th gear and they can vary quite a bit, around 8 - 10%. It doesn't matter what gear you use to check the A/F ratio, but for HP numbers, you need to be as close to 1-1 ratio as possible at the rear wheels. If you are not, you are skewing the results either high or low depending on which side of the 1-1 ratio you are on. This applies to Mustang and Dyno-Jets as those are the only ones I am familiar with...

Also, I hate the 15% rule but that applies to Dyno-Jet numbers. Mustang Dyno's properly calibrated will produce a lower number than the Dyno-Jet so it is not correct to use it for a Mustang Dyno number. Mustang Dyno's are known as the Magic number dyno so it is really hard to say what you have without seeing the graph...
 
#20
I don't have experience with Dynojet or Mustang Dyno (as the Dynojet facility near me is known for inflated numbers). I've heard many times on those that 3rd and 4th gear makes a difference. But on the dyno I use, it does not.
 
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