Re: Will a turbo car run the exact same at sea level and? - Saab Performance Bulletin Board - Saabnet.com
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Re: Will a turbo car run the exact same at sea level and?
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Posted by John Williams [Email] (#1982) [Profile/Gallery] (more from John Williams) on Tue, 24 Aug 2010 07:54:20 Share Post by Email
In Reply to: Will a turbo car run the exact same at sea level and?, Craig T, Sun, 22 Aug 2010 15:00:19
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This is something I know about :-) I live in Denver at 6000' and hear this debate all the time. Even though some cars like a Viggen claim to keep the same power at elevation and at sea-level. I have multiple dynos showing this is just not true. We have a stock viggen making 220whp sae on a dynojet dyno, uncorrected it is 175whp. Many people have made around 210-220whp uncorrected at sea-level, the viggen still lost about 10% power at 6000'.

I have seen multiple turbo cars move to Denver from sea-level, they lose right at about a half a second. One guy with 300whp and turbo car ran 12.00 in Phoenix, moved to Denver and he runs consistant 12.5 times.

The NHRA says to cut the CF in half for turbo and supercharged cars, this seems to be right on the money. You can get the CF for Bandimere in Denver and then use the 1/8th mile CF factor or half and it will give you the closest CF for a turbo car.

Turbo cars have to run the turbo harder to make the same power and that heat soaks the IC and other compenents much faster and the air is less dense so the IC is less efficient and the Choke line of the turbo compressor map is moved to the left at elevation and its much easier to run out of its efficiency range. Bottom line is the thin air effects all cars, turbo or not, its just that instead of losing a full second like a NA car, you will lose a half a second,

John

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