07-08-2012, 08:21 AM
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#40 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3596
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Quote:
Originally Posted by DIGItonium
Thanks for the clarification, wstar. How does this affect your updated throttle tables? I really hate the feeling of not being able to open up the throttle more than anticipated under 2k and even worse when hot.
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It doesn't affect throttle tables in any real way. Heat is heat, engines don't like hot air.
Quote:
Originally Posted by cossie1600
You guys must have a special car or special sensitive butt dyno. I ran my car around the track at 190F (first lap), to 260F near the end of the session (18 min later), it had virtually no change in acceleration performance as verified by top speed/long g's.
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It's really about the hot air, not about the hot engine oil. If your intake air was relatively consistent, the oil temp isn't going to affect things too hugely (other than perhaps some minor effects from hotter coolant/block heating your intake air a bit on the way in). No engine likes breathing hot air, because there's less oxygen per volume to use. Hotter air is effectively the same thing as restricting intake volume and/or flow rate (think NASCAR restrictor plates).
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