Quiet HP Increase in Exhaust

[Ciao]

Originally Posted by pkp4911

Just a little bit more...I live in the mountains and am down at least 10-15% due to altitude. Capiche?

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Unless you have a turbo; unaffected by altitude

[particlewave]

Originally Posted by Ciao

Unless you have a turbo; unaffected by altitude

NA engines are absolutely affected by altitude. Significantly.

The formula for hp loss is "e x 0.00003 x hp", where e=elevation and hp=horsepower at sea level.
A NA car that produces 200hp at sea level will only produce about 168hp in Denver (elevation 5,280ft above sea level).

An '01S 3.2 rated at 250hp at sea level would produce about 210hp in Denver. Just a smidge more than a stock 2.5 base (201hp).


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[Brian in Tucson]

Originally Posted by particlewave

NA engines are absolutely affected by altitude. Significantly.

The formula for hp loss is "e x 0.00003 x hp", where e=elevation and hp=horsepower at sea level.
A NA car that produces 200hp at sea level will only produce about 168hp in Denver (elevation 5,280ft above sea level).

An '01S 3.2 rated at 250hp at sea level would produce about 210hp in Denver. Just a smidge more than a stock 2.5 base (201hp).


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Interesting post. I used to have a GPz 750 Turbo. Always wondered why guys at altitude would pay so much for adjustible boost. Now I know.

It WAS a lot of fun on the road that circles Lake Tahoe. Especially with a muffler that had no packing. I think you could hear it coming 3 miles away.

This from a "responsible senior" https://phoenix.craigslist.org/nph/cto/d/2000-porsche-boxster-turbo/6522725024.html Yeah, right!

[nieuwhzn]

This is why it is so easy to get more power out of a turbo engine. The factory tune has to satisfy all the different parameters like altitude, octane level, clean/dirty air filters, temperature range, etc. Manufacturers opt for an average tune that makes everyone happy. If you are at sea level, can get high octane gas and are in a moderate temperature zone it's easy to get 20% more hp and especially torque without any hardware mods.

[pkp4911]

All,
I just stumbled on to this thread from back in 2018. I suffer from CRS these days and am a bit embarrassed to find this. I am still with original exhaust set-up and did look into 987 manifolds. Turns out I also DO need to worry about emissions. Thanks for your weigh-in!