Temperature and the LS2 - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 05-28-2005, 04:31 PM Thread Starter
 
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Temperature and the LS2

Has anyone else noticed that as the temperature has gone up your performance has dropped. I had a LS1 and it would lose .2-.3 and 2 mph as the temp went up, but I ran 13.7, 14.2 and 13.9 last night and the only difference has been the temperature. I'm now running 102 mph.

The only area I see that could be causing this is the intake and from it's design the intake temperature climbing. The computer would pull timing, but I'm down about a second and that would be about a 75 hp loss. It's about 20-25 degrees warmer now than when I hit my 12.895. 60-65 versus 80-85. More humid too, but that should not make that much of a difference should it?
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post #2 of 18 (permalink) Old 05-29-2005, 03:25 AM
 
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It has and will make a difference... LSx Engines love cold air... hot air means thinner air and longer cooldown periods for the engine. Once these engines get hot they start pulling serious timing... CAIs help but don't do it all... jumping your fans to a switch at your fingertips should help you keep temps under control... and yes, 20 degrees makes a big difference with the LSx engines. You can find a few more threads on this subject if you look around.... IMO These things are still monsters even if they have some heat issues
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post #3 of 18 (permalink) Old 05-29-2005, 10:08 AM
 
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Most cars lose power in the heat due to less oxygen per volume of air. The temp. guage in my old 300zx twin turbo would start rising if I was stopped and it was above 85 degrees. It would then shut off the a/c when the engine temp. got hot enough (not fun when sitting in traffic in August). My 05 GTO is much better in this regard - no engine temp going up yet, and although I do notice a slight lack of power when the car is hot, it's nothing compared to other cars.
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post #4 of 18 (permalink) Old 05-29-2005, 11:13 AM Thread Starter
 
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I guess what I'm getting at is my LS1 in my Camaro Z28 was run at Famoso in Bakersfield. At times it would be real close to 100 degrees out and I'd run a 13.7 instead of my usual 13.0 to 13.1 at 55-70 degrees. This thing has gone from 12.9 -13.1 to 13.7-14.2 and it's only 85 degrees. There is more humidity involved, but it sure seems like a much larger difference than I was expecting.
Has anybody else experienced this large of a drop in performance?
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post #5 of 18 (permalink) Old 05-29-2005, 12:08 PM
 
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The heat soak is very frusterating. Hot&Humid night at the track this week 45 min cool off ran a 2.17 60ft 13.7 at 101mph wait 11 minutes hot lapped to a 2.28 60ft 14.3 at 97mph wait 10 minutes ran 2.26 60ft 14.6 at 96 mph. Toss out the 60fts track was not prepped worth a dang (usually have 2.0 60s). Temp on first pass was 190, Second was 219, and third was 230. I will no longer race the car unless it is below 190 at staging.

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post #6 of 18 (permalink) Old 05-29-2005, 12:32 PM Thread Starter
 
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Quote:
Originally Posted by eldodroptop
The heat soak is very frusterating. Hot&Humid night at the track this week 45 min cool off ran a 2.17 60ft 13.7 at 101mph wait 11 minutes hot lapped to a 2.28 60ft 14.3 at 97mph wait 10 minutes ran 2.26 60ft 14.6 at 96 mph. Toss out the 60fts track was not prepped worth a dang (usually have 2.0 60s). Temp on first pass was 190, Second was 219, and third was 330. I will no longer race the car unless it is below 190 at staging.
Ok, this is exactly what I'm experiencing. It didn't happen with my LS1 Camaro. Sure there was a drop in performance, but not like this. Has anyone with a LS1 GTO experienced similar problems with heat or is this a LS2 issue?
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post #7 of 18 (permalink) Old 05-30-2005, 12:44 PM
 
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MY first runs ever in my goat were all 13.8s. The next time at the track, temps were up could not even hit a 13. My best run of the night was a 14.1. The only difference was temps were up about 15 degrees.
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post #8 of 18 (permalink) Old 06-02-2005, 03:24 PM
 
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I had a thread in another forum about this. My 05 GTO looses a lot of power as soon as the engine gets hot. I mean it looses a lot of power. Very noticable.
I've never driven a car that is effected so dramatically by the heat. As long as the engine stays cool the car runs very strong. But as soon as the engine temp goes up, the power drops
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post #9 of 18 (permalink) Old 06-02-2005, 03:42 PM
 
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cooler thermostat?

Several mod sites usually offer lower temp thermostats to kep engine compartments cooler. I have not seen anything about changing the thermostat on the LS2 and its effects. Any opinions?
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post #10 of 18 (permalink) Old 06-02-2005, 04:43 PM
 
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Running Mobil 1? My engine temp dropped 20-25% after doing so. Gauge used to go to 1/2, now it's consistently at the 3/8 mark. FYI.
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