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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 04-05-2009, 07:01 PM   #1
BackinBlackSS/RS
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Heatsoak as bad as LS2?

Probably not a lot of information out there about this, but I thought I would get a thread going. My LS2 on my GTO was real bad about heatsoak. I had
a New Era intake on it and it caused a noticable drop in power because of heatsoak. So are you guys gonna leave it stock, go with a closed box system
like the GM performance product or go with open element?
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Old 04-05-2009, 07:18 PM   #2
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Good Question? That is something I have never put alot of thought into!
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Old 04-05-2009, 07:22 PM   #3
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What do you mean by heatsoak. Splain it Lucy pls.

Talking about intake air temp?
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Old 04-05-2009, 07:23 PM   #4
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What do you mean by heatsoak. Splain it Lucy pls.

Talking about intake air temp?
Heatsoak is when the air going into the intake is so hot that you actually
lose power.
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Old 04-05-2009, 08:43 PM   #5
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I assume because there is not a lot of air going into the engine bay and the hood scoops don't work? I would assume the maro would be a little better because i had a larger grill allowing more air in.
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Old 04-06-2009, 03:19 AM   #6
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I assume because there is not a lot of air going into the engine bay and the hood scoops don't work? I would assume the maro would be a little better because i had a larger grill allowing more air in.
I agree somewhat, but the majority of the airflow actually comes from the bottom. But I do see the grill opening helping compared to the really aerodynamic GTO.
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Old 04-06-2009, 11:42 AM   #7
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Hum only time will tell. I am sure GM tested it's design properly. Much more modern tools nowdays for thermal. I did notice the hole is close to the condenser that might be something to look at just as the closest heat source.
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Old 04-06-2009, 01:01 PM   #8
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There is always a hood with a functional hood scoop on it that directs the air to the intake.
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Old 04-06-2009, 11:00 PM   #9
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Did the GTO's really have that much of a heatsoak problem?

My 1998 Camaro was designed many years earlier and it doesn't seem to have a problem.

Have you measured Intake Air Temperature with a scanning tool when the car is cool versus when it is hot?
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Old 04-06-2009, 11:26 PM   #10
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^^ Yes and no, mine did not suffer but then again I have a 04, which has the LS1. I do have friends that have the LS2 GTOs and they do suffer from this problem.
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Old 04-06-2009, 11:47 PM   #11
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all you gotta do is tune it a bit, the pcm pulls timing at lower than necessary temp, you can change the IAT Spark table and get rid of the reduction in timing
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Old 04-07-2009, 12:18 AM   #12
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Probably not the same type of thing you are talking about but ....

Only heat issues I noticed with the LS1 in my 2000 Camaro SS was that in the summer after driving for extended amounts of time in town (lots of stop and go) there was a VERY noticable difference in the power output. After I replaced the stock thermo w/ an SLP 160degree thermostat I never had issues with power getting robbed from that type of heat...I got the same thermo to help that issue with the LS1 in my vette too....
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Old 04-07-2009, 07:37 AM   #13
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Heat soak is a problem with stock tuned LS2s. When driving around on a 90 degree day, power is greatly reduced (sluggish in comparison to 70 degree weather). It has a lot to do with the factory tuning.
Once I got my GTO dyno tuned, my GTO didn't seem to be affected all that much by heat soak.

Also the New Era intake isn't the best choice for an intake. I had a New Era intake on my 05 GTO and it was really down on power with the factory tune. Later New Era made a new version of the intake because there were so many complaints about power loss with stock tuning. I'm not sure if the version 2 Intake worked any better.
I replaced mine with a LPE (Lingenfelter intake) which worked a lot better.

But even running the stock airbox, LS2's are down on power driving around in warm/hot air conditions (summer conditions).


The Corvette guys would know if the LS3 also suffers from these heat soak issues.
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Old 04-07-2009, 12:02 PM   #14
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hmmmm so do you think the 160 thermostat would be a good idea for the new camaro's? or is this not an issue with the ls3?
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Old 04-07-2009, 12:19 PM   #15
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Quote:
Originally Posted by JMAN311 View Post
Probably not the same type of thing you are talking about but ....

Only heat issues I noticed with the LS1 in my 2000 Camaro SS was that in the summer after driving for extended amounts of time in town (lots of stop and go) there was a VERY noticable difference in the power output. After I replaced the stock thermo w/ an SLP 160degree thermostat I never had issues with power getting robbed from that type of heat...I got the same thermo to help that issue with the LS1 in my vette too....
I had the same problem with my 98 SS, a 160deg thermo and reprogramed fan peramiters solved that problem.

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hmmmm so do you think the 160 thermostat would be a good idea for the new camaro's? or is this not an issue with the ls3?
Some people will tell you not to because they say LS engines like a little heat, that you'll get worse gas mileage because the engine isn't warm enough, or that your heat won't work as well in the winter. They'll say if you must change it only go down to a 180deg. I love my 160deg thermo. Power is always there, even on 90deg days, heat works great even at below freezing temps, and I saw no noticable drop in fuel economy. When I get my 5th gen I'll be swapping to a 160deg thermo. If you want optimum results, also have the temperature the fan comes on at lowered.
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Old 04-07-2009, 12:32 PM   #16
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160 way to cool for the cats and the oil. 180 to 215 is what you want your coolant range to be. So 180 stat. Look for the 2 fans to effect coolant temp more than anything. If things are running 2 hot get them reprogramed and or manual switch added.

What he's talking about is more an airflow issue and getting stale, hot air vs cooler outside air for a better mix. I have a feeling GM tested this because they have way advanced thermal analysis tools nowdays.
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Old 04-07-2009, 01:41 PM   #17
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you can relocate the IAT sensor. On the TBSS is was in the air intake tube, just on top of the radiator hose so i moved it in front of the CAI..then had it tuned on a dyno.
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Old 04-08-2009, 03:08 AM   #18
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you just tune out the iat spark reduction, not a big deal you don't have to change thermostats or anything like that. Just stop the PCM from pulling all the timing.
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Old 05-09-2009, 07:08 PM   #19
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hmmmm so do you think the 160 thermostat would be a good idea for the new camaro's? or is this not an issue with the ls3?
I have a charger srt8 and took out the stock 203° thermostat and installed a 180° thermostat. Some SRT8 guys installed 170° thermostat and had their "check engine" light go on. I also chaged the fan parameters and that help the car alot.
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Old 05-09-2009, 07:16 PM   #20
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HOT Air

Quote:
Originally Posted by BackinBlackSS/RS View Post
Probably not a lot of information out there about this, but I thought I would get a thread going. My LS2 on my GTO was real bad about heatsoak. I had
a New Era intake on it and it caused a noticable drop in power because of heatsoak. So are you guys gonna leave it stock, go with a closed box system
like the GM performance product or go with open element?
When driving in extreme heat the Oxygen level is at a lower level, but if you buy your car in a hot area, the fuel and air mix setting are better. But also the new computer usually makes adjustment where -ever you are driving.
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