Heat soak, what to expect

cossie1600 · 07-07-2012, 11:21 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, 09:21 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).

babbagandu · 07-09-2012, 11:40 PM

Quote:

Originally Posted by Evil Sports

I would love to but there seems to be a problem with inspections here in Mass that are able to detect Uprev tuned cars even if they dont have stuff/mods that would fail on them:shakes head: I posted it here and got totally slammed by people thinking I had some agenda and nothing could be further from the truth.
Oh well I guess I will just wait, and so much for 1 click above 220....
[IMG]http://sphotos.xx.fbcdn.net/hphotos-ash4/229915_3627189271715_748950843_n.jpgIMG]

could you please elaborate on this? Are you talking about emissions inspections? And if yes, what does an uprev tune have to do with emissions?

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07-07-2012, 11:21 PM	#61 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	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.