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Old 02-16-2010, 06:17 PM   #1
chads09
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Default Dyno numbers on a hot day vs a cool day

I was wondering if anyone could give me an estimate as how much more whp you could make on a mustang dyno if it were 90 degrees outside vs a day where it was in the 40s. 30whp sound like to much of a difference? The reason i'm asking is I cant get over why my 09 is making 30whp less than other 09's at the same dyno shop with same mods.
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Old 02-16-2010, 06:24 PM   #2
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Different type of dyno? Dynojet maybe? Different tune?
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Old 02-16-2010, 06:39 PM   #3
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The tune and air temp will have difference in a/f ratio...which will cause a difference in hp.
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Old 02-16-2010, 07:03 PM   #4
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Ive heard +/- 10% power per every 32*F.
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Old 02-16-2010, 07:57 PM   #5
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hmm well it was the same dyno. I am told now that it could have been calibrated different, or i could have had bad fuel that day, or it could be the atmospheric pressure difference on that day, and that my car could just be weaker. But there is no way my car is 30whp weaker than 20 other 09/10's they dynoed haha.
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Old 02-16-2010, 08:07 PM   #6
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Are you talking raw HP numbers? There are correction factors for temp and pressure.
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Old 02-16-2010, 08:54 PM   #7
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Quote:
Originally Posted by Web Foot STi View Post
Are you talking raw HP numbers? There are correction factors for temp and pressure.

Im talking RWHP on surgelines dyno. If you go to surgelines website they have a dyno plot page mine is on there 30whp less than every other 09 on there with the same mods.
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Old 02-17-2010, 01:41 AM   #8
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yes temperature makes a diff, the colder the more power you make up to a point. because there is more Oxygen in colder air then hot air.
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Old 02-17-2010, 12:41 PM   #9
chads09
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Well ya i know it makes a difference just wondering about 30whp difference haha.
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Old 02-17-2010, 03:36 PM   #10
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How much mileage is on the car?
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Old 02-17-2010, 03:45 PM   #11
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Quote:
Originally Posted by chads09 View Post
Well ya i know it makes a difference just wondering about 30whp difference haha.
That's a bit much. Have you asked Tim?
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Old 02-17-2010, 04:19 PM   #12
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Quote:
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How much mileage is on the car?
At the time of the tune there was under 5k. I was thinking maybe because the car wasnt broken in or something. But now i really just think it has to do with the fact that it was 90 degrees that day, and Tim even said the calibration settings may have been off also.
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Old 02-17-2010, 04:21 PM   #13
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Quote:
Originally Posted by Byzantium View Post
That's a bit much. Have you asked Tim?
Tim said it could have been a number of things, weaker car which i highly doubt that because 30whp is a lot, atmospheric conditions, different calibrations on the dyno, bad wastegate actuator.
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Old 02-17-2010, 04:33 PM   #14
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Honestly, any answer you get from him is going to be better than what you will hear from us. It is his dyno after all.
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Old 02-17-2010, 05:10 PM   #15
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90 degrees out? When did you have it dynoed?
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Old 02-17-2010, 05:31 PM   #16
chads09
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Quote:
Originally Posted by xrwwrx View Post
90 degrees out? When did you have it dynoed?

June 18th is when it was dynoed. I remember it being very hot that day. Ya i figured anything from him is good I just wish he had a definitive answer like "the calibration was off", because I know another dyno on here done at surgeline said 263whp for a stock 09 lol. They admitted the dyno calibration was off on that one.
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Old 02-17-2010, 05:33 PM   #17
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Quote:
Originally Posted by chads09 View Post
Im talking RWHP on surgelines dyno.
rwhp=rear wheel horse power.

Not sure if you mean't "raw" wheel horsepower. It could be a number of different things. Dyno numbers mean next to nothing and are pretty much a bragging point. They should not really be used as a comparison.

But how does the car feel? Everything seem to be running ok? Maybe ask one of the "other guys" to take a ride with them and see if it feels different. Best of all, talk to the tuner.
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Old 02-17-2010, 05:35 PM   #18
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Quote:
Originally Posted by chads09 View Post
Im talking RWHP on surgelines dyno.
rwhp=rear wheel horse power.

Not sure if you mean't "raw" wheel horsepower. It could be a number of different things. Dyno numbers mean next to nothing and are pretty much a bragging point. They should not really be used as a comparison.

But how does the car feel? Everything seem to be running ok? Is the car mechanically sound? No leaks or loose hoses, compression/leak down is ok, etc. Maybe ask one of the "other guys" to take a ride with them and see if it feels different. Best of all, talk to the tuner.
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Old 02-17-2010, 05:39 PM   #19
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Quote:
Originally Posted by ThreeEleven View Post
rwhp=rear wheel horse power.

Not sure if you mean't "raw" wheel horsepower. It could be a number of different things. Dyno numbers mean next to nothing and are pretty much a bragging point. They should not really be used as a comparison.

But how does the car feel? Everything seem to be running ok? Maybe ask one of the "other guys" to take a ride with them and see if it feels different. Best of all, talk to the tuner.

Ya the car runs perfect. I guess thats all i should care about. Im just trying not to get wrapped into another $400 dyno to see if its any different now with 14k on it vs 4k when i had it done.
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Old 02-17-2010, 05:43 PM   #20
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Wouldn't hurt to do some logs and send them to your tuner to have him review them and tell you if everything looks ok.
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Old 02-17-2010, 05:53 PM   #21
chads09
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Quote:
Originally Posted by ThreeEleven View Post
Wouldn't hurt to do some logs and send them to your tuner to have him review them and tell you if everything looks ok.
Ya I actually did send in some data logs a couple months ago because my boost is tapering down to around 10psi at redline when it should be around 12 or 13. They said it looked like they needed to make some more adjustments because of my altitude here in bend." Then never heard back. I'm just not 100% satisfied with the whole deal like i feel i should be.
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Old 02-17-2010, 06:06 PM   #22
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Well you should definately feel satisfied paying that premium $400.

Ask if they'll just make the proper adjustments for free since you already payed for the tune if you haven't done any addition mods. If they won't, you may have to dish out the money for another tune or find a new tuner in which you trust and feel satisfied with.
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Old 02-17-2010, 07:19 PM   #23
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On a similar side note, are there any benefits getting tuned on a hot day vs a cold day? I feel like the tuner could tune out any detonation better when it's warm, up to a point?
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Old 02-17-2010, 07:38 PM   #24
chads09
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Quote:
Originally Posted by Subian View Post
On a similar side note, are there any benefits getting tuned on a hot day vs a cold day? I feel like the tuner could tune out any detonation better when it's warm, up to a point?

Well the day he did mine it was wanting to detonate around 17 psi. So in combination of 90 degrees and a 3 hour drive to surgeline and my car sitting for 30 minutes in the heat, it probably had heat soak i would guess.
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