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      04-03-2018, 06:22 PM   #1
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Heat Soak?

To those who have been running stock M2's on the track or (very) spirited street driving: Are you experiencing any overheating / heat soak issues?

Looking forward to a few events this year, but concerned too since this is the my first turbo car. I don't want to mod to maintain manuf warranty.
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      04-03-2018, 06:27 PM   #2
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Quote:
Originally Posted by Rupes View Post
To those who have been running stock M2's on the track or (very) spirited street driving: Are you experiencing any overheating / heat soak issues?

Looking forward to a few events this year, but concerned too since this is the my first turbo car. I don't want to mod to maintain manuf warranty.
Lots of comments on this in the Track section of the forum.
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      04-03-2018, 06:43 PM   #3
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Originally Posted by ZM2 View Post
Lots of comments on this in the Track section of the forum.
Thanks - you’re right.
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      04-03-2018, 09:46 PM   #4
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Quote:
Originally Posted by Rupes View Post
Thanks - you’re right.
No worries.

Simple answer is if you stay stock, you’ll be fine but might feel a little loss of power on very hot days.

If you add boost, be prepared to go down the rabbit hole, albeit a fun (and expensive) one.
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      04-03-2018, 09:49 PM   #5
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Running stock. No heat soak issues whatsoever. This car needs more grip than power on the track.
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      04-04-2018, 03:56 PM   #6
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After tossing these cars around in Thermal CA and knowing how hot it was and gets, I would not be too worried about heat soak. These cars are pretty durable.
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      04-05-2018, 07:15 PM   #7
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I live in AZ so on the hottest days 118ish I will get some heatsoak but when I track it I do it during the fall, winter or spring so 90ish or below I have not had an issue. I have a stage 1 VF engineering tune. If your going to track during hot days and or mod from what I have read the CSF radiator mod is the way to go. The heat soak issue is largely due to insufficient radiator cooling resulting in high coolant temps and to protect itself the car pulls power. I have decided to not mod my car for this very reason. I will eventually do this and all of the other CSF cooling mods but not for a while.

Chances are that you will not have much of an issue with heat soak, I have driven the M2 at thermal on three occasions twice with temps over 90 degrees and those cars are driven with AC on and idle between sessions and heat soak is not an issue for them really. I assume on the 115 degree days just about any car is going to have some heat soak.
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      04-06-2018, 10:44 AM   #8
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Quote:
Originally Posted by pruettfan View Post
I live in AZ so on the hottest days 118ish I will get some heatsoak but when I track it I do it during the fall, winter or spring so 90ish or below I have not had an issue. I have a stage 1 VF engineering tune. If your going to track during hot days and or mod from what I have read the CSF radiator mod is the way to go. The heat soak issue is largely due to insufficient radiator cooling resulting in high coolant temps and to protect itself the car pulls power. I have decided to not mod my car for this very reason. I will eventually do this and all of the other CSF cooling mods but not for a while.

Chances are that you will not have much of an issue with heat soak, I have driven the M2 at thermal on three occasions twice with temps over 90 degrees and those cars are driven with AC on and idle between sessions and heat soak is not an issue for them really. I assume on the 115 degree days just about any car is going to have some heat soak.
Heat soak is due more to high IAT's and DME pulling the timing/lowering boost target as opposed to coolant temps....
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      04-06-2018, 11:13 AM   #9
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Quote:
Originally Posted by Bee Pee View Post
Heat soak is due more to high IAT's and DME pulling the timing/lowering boost target as opposed to coolant temps....
Too add more color, when I was stock I only noticed reduced power from high IATs on a 100F+ day and 20min into a session. If the AC is on, it will raise the coolant loop temp and I’d get reduced power 15min into a session on a super hot day.

Any boost increase mod really needs a larger intercooler. I would have power reduction 10min into a session on 85F and higher days. My Dinan IC fixed that, but I still get slight power reduction after 35min on 100F open track days.

I’ll go with the full CSF cooling package when I get the Dinan big turbo later this year. Hoping I can run the AC full blast and still have lots of power!
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      04-06-2018, 11:20 AM   #10
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My Dinan intercooler arrives in a couple of days. I have experienced heat soak in some other cars and it is not a nice thing. I'm taking precautionary measures now. And if it drives even better on the road, why not?
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      04-07-2018, 04:27 PM   #11
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Quote:
Originally Posted by Bee Pee View Post
Heat soak is due more to high IAT's and DME pulling the timing/lowering boost target as opposed to coolant temps....
There is a fellow here that posted the data saying the opposite, says the coolant temps are the biggest issue, he put the CSF radiator in and says the issue is resolved. I believe he posted this in the tuning section but you might find his data interesting. I am no expert so I'm not arguing just thought I would share what he found.
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      12-10-2019, 02:36 PM   #12
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Quote:
Originally Posted by ZM2 View Post
Too add more color, when I was stock I only noticed reduced power from high IATs on a 100F+ day and 20min into a session. If the AC is on, it will raise the coolant loop temp and I’d get reduced power 15min into a session on a super hot day.

Any boost increase mod really needs a larger intercooler. I would have power reduction 10min into a session on 85F and higher days. My Dinan IC fixed that, but I still get slight power reduction after 35min on 100F open track days.

I’ll go with the full CSF cooling package when I get the Dinan big turbo later this year. Hoping I can run the AC full blast and still have lots of power!
How high is high for IATs?
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      12-10-2019, 02:47 PM   #13
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Wow, thread revive!

2 and a half years later and I can vouch for what ZM2 said. He was spot on. I'm stock in terms of engine and no noticeable heat soak on my car. Of course south Germany doesn't often see 100F weather but still.
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      12-10-2019, 03:18 PM   #14
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Quote:
Originally Posted by GeraldM2 View Post
How high is high for IATs?
Noticeable timing pull will begin with IATs >110F if you’re running 93 octane. Higher octane and ethanol will prevent timing pull as temps go higher.
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      12-10-2019, 04:13 PM   #15
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Quote:
Originally Posted by ZM2 View Post
Noticeable timing pull will begin with IATs >110F if you’re running 93 octane. Higher octane and ethanol will prevent timing pull as temps go higher.
There is no octane/flexfuel sensor on these cars, right? How will higher octane or ethanol prevent timing pull as temps go higher. There has to be more to it than just putting in higher octane or ethanol. Are you saying that higher octane or ethanol will prevent knocking/detonation (with high temps) which, in turn, will result in less timing pull? I am not trying to question you, ZM2, just trying to learn and confirm what I think I know about cars. Thanks!
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      12-10-2019, 04:16 PM   #16
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Quote:
Originally Posted by M2guru View Post
There is no octane/flexfuel sensor on these cars, right? How will higher octane or ethanol prevent timing pull as temps go higher. There has to be more to it than just putting in higher octane or ethanol. Are you saying that higher octane or ethanol will prevent knocking/detonation (with high temps) which, in turn, will result in less timing pull? I am not trying to question you, ZM2, just trying to learn and confirm what I think I know about cars. Thanks!
Yup, the timing pull related to IAT is all about knock prevention. Higher octane/ethanol helps reduce knock and timing pull at higher IATs.
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      12-10-2019, 07:01 PM   #17
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*hugs wagner evo 2 comp intercooler*
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      12-10-2019, 10:00 PM   #18
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I have an Awron gauge which logged 140 plus IAT at Road Atlanta...the car felt like it was pulling timing. Put on Wagner Evo 1 comp ( plus larger oil cooler) and problem solved...temps are roughly 30 degrees lower.
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      12-11-2019, 06:41 AM   #19
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How does the cooling system on this car compare to the F80/82? I assume the OG M2 is not as capable, is the M2C identical to its big brother or are there minor differences?
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      12-11-2019, 10:17 AM   #20
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I ran my M2C at Willow Springs this year with just a BM3 stage one tune. The whole weekend it was 100-105 degrees and the car did awesome. Zero issues. The driver definitely had heat soak issues.
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      12-11-2019, 01:08 PM   #21
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Quote:
Originally Posted by Racer20 View Post
How does the cooling system on this car compare to the F80/82? I assume the OG M2 is not as capable, is the M2C identical to its big brother or are there minor differences?
M2c is identical to m3/4.

OG m2 cooling is not good, small air to air IC instead of air to water.
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