Heat soak, what to expect

MJB · 07-07-2012, 03:53 PM

Its been in the 100's here in central Texas as well. I can really feel power loss in these conditions. I was thinking about getting a vented hood to try and let some of that heat escape from the engine bay.

Man, I can't wait to get back home to WA state next year!!!! If it gets in the high 80's during the summer, thats considered a hot day for us, lol.

cossie1600 · 07-07-2012, 10:21 PM

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.

wstar · 07-08-2012, 08:21 AM

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.

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.

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).

07-07-2012, 03:53 PM	#1 (permalink)
MJB A True Z Fanatic Join Date: Aug 2011 Location: Tacoma, WA Age: 41 Posts: 1,498 Drives: a POS truck Rep Power: 496	Its been in the 100's here in central Texas as well. I can really feel power loss in these conditions. I was thinking about getting a vented hood to try and let some of that heat escape from the engine bay. Man, I can't wait to get back home to WA state next year!!!! If it gets in the high 80's during the summer, thats considered a hot day for us, lol. __________________ 09 Nismo #0483 sold. Viper or C7 next time around. Last edited by MJB; 07-07-2012 at 04:01 PM.

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07-07-2012, 10:21 PM	#2 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 31	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.