Heat soak?

RandyC54 · 04-26-2018, 11:21 PM

Pat's GTS is running like a champ for 4-5 laps at VIR, and then the power starts to fall off for the rest of the run. Getting plenty of water now, so that's not the issue. Has anybody that tracks this car seen any issues with heat soak after a few laps? Any other ideas? We're both baffled!!

BarryB · 04-27-2018, 09:19 AM

Nope. Run her in the heat with multiple laps per sessions with no issues. Need to get it checked out.......rather run out of tire before run out of power.....

jeff@autocouture · 04-27-2018, 09:29 AM

Never had issues in any of my m4s to be honest with heat

redrumm3 · 04-27-2018, 10:23 AM

No issues for me, even in hot, humid Florida.

RandyC54 · 04-27-2018, 10:48 AM

OK - so what the hell could it be? Maybe Pat's just an awesome driver that pushes his car further than anybody else has the skill and ability to duplicate? Nah, that's not it.

robbo mcs · 04-28-2018, 04:26 AM

Quote:

Originally Posted by RandyC54

OK - so what the hell could it be? Maybe Pat's just an awesome driver that pushes his car further than anybody else has the skill and ability to duplicate? Nah, that's not it.

Have you checked the water level in the charge cooler, and checked the pump and piping? That is a cause of cars heatsoaking and pulling power. Usually throws a code though

BMW9 · 04-28-2018, 10:11 AM

Quote:

Originally Posted by RandyC54

Pat's GTS is running like a champ for 4-5 laps at VIR, and then the power starts to fall off for the rest of the run. Getting plenty of water now, so that's not the issue. Has anybody that tracks this car seen any issues with heat soak after a few laps? Any other ideas? We're both baffled!!

Do you see the temp gauge reading high temps? What was the track temp that day? Maybe you had some bad gas in the car. Not all pumps that advertise 91 or 93 actually have that octane (most do but not all). I always blend in some 100 octane when I go to the track just to be on the safe side.

RandyC54 · 04-28-2018, 04:30 PM

Temperature was cool - mid 60's each time. Oil temp gets to hovering around 250, which I do think is high, but the question is why is the oil getting that hot. Bad gas would be down on power always, not just after 4-5 laps.

Keep the suggestions coming, so Pat does not give up and buy a Porsche!!

rr_m · 05-03-2018, 08:00 PM

Just throwing it out there, but too many late shifts? I put an M5 into limp mode the first M school I did because I was banging the limiter too many times even though I thought I was shifting on time. (I just put a Smartycam in my GTS with ECU connection and my shifts are actually coming at a higher RPM than I was even aware.)

But no, I've never had an issue with power loss during a hard 30-minute session.

Rr

RandyC54 · 05-04-2018, 07:33 AM

Pat's mystery (and misery) continues. All good ideas, so keep 'em coming! Our dealer continues to investigate, including asking me to bring mine over yesterday so they could do some comparisons. This guy won't put in seats and harness until he's sure the car is sound for hard track use, so I guess his safety does have a price tag.

04-26-2018, 11:21 PM	#1
RandyC54 Salty Middle Aged Dog 142 Rep 165 Posts Drives: 2016 M4 GTS Join Date: Feb 2017 Location: Richmond, VA iTrader: (0)	Heat soak? Pat's GTS is running like a champ for 4-5 laps at VIR, and then the power starts to fall off for the rest of the run. Getting plenty of water now, so that's not the issue. Has anybody that tracks this car seen any issues with heat soak after a few laps? Any other ideas? We're both baffled!! __________________ 2018 Porsche GT2 RS, Black 2018 Mercedes GLS63 AMG, Black, DD and TV 1997 BMW E31 840i, Black (fully restored!!)
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04-27-2018, 09:19 AM	#2
BarryB Lieutenant Colonel 871 Rep 1,758 Posts Drives: 30Jahre M5 plus a few more M's Join Date: May 2012 Location: Palo Alto CA iTrader: (0) Garage List 2022 BMW M5 CS [0.00] 2020 BMW M340i Xdrive [0.00] 2019 BMW M2 Competi ... [0.00] 2003 BMW DINAN S3 M5 [0.00] 2017 BMW 30 Jahre M3 [0.00] 2016 BMW M4 GTS [0.00] 2015 BMW 30 Jahre M5 [0.00] 1995 BMW M3 [0.00]	Nope. Run her in the heat with multiple laps per sessions with no issues. Need to get it checked out.......rather run out of tire before run out of power..... __________________ Current non-BMW's 20 Jeep Grand Cherokee 03 Cooper S (Maxi Tuned 50bhp) 60 Impala (43k orig mi) 15 Turbo S (Kobb tune and Kline exhaust)
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04-27-2018, 09:29 AM	#3
jeff@autocouture BimmerPost Supporting Vendor 966 Rep 13,780 Posts Drives: 2002 E53 X5 4.6is Join Date: Jan 2010 Location: New Jersey iTrader: (0)	Never had issues in any of my m4s to be honest with heat
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04-27-2018, 10:23 AM	#4
redrumm3 Second Lieutenant 417 Rep 261 Posts Drives: M4 GTS, M3 GT4, E30 M3... Join Date: Mar 2012 Location: FL iTrader: (0) Garage List 2009 BMW M3 GT4 [0.00]	No issues for me, even in hot, humid Florida.
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04-27-2018, 10:48 AM	#5
RandyC54 Salty Middle Aged Dog 142 Rep 165 Posts Drives: 2016 M4 GTS Join Date: Feb 2017 Location: Richmond, VA iTrader: (0)	OK - so what the hell could it be? Maybe Pat's just an awesome driver that pushes his car further than anybody else has the skill and ability to duplicate? Nah, that's not it. __________________ 2018 Porsche GT2 RS, Black 2018 Mercedes GLS63 AMG, Black, DD and TV 1997 BMW E31 840i, Black (fully restored!!)
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04-28-2018, 04:30 PM	#8
RandyC54 Salty Middle Aged Dog 142 Rep 165 Posts Drives: 2016 M4 GTS Join Date: Feb 2017 Location: Richmond, VA iTrader: (0)	Temperature was cool - mid 60's each time. Oil temp gets to hovering around 250, which I do think is high, but the question is why is the oil getting that hot. Bad gas would be down on power always, not just after 4-5 laps. Keep the suggestions coming, so Pat does not give up and buy a Porsche!! __________________ 2018 Porsche GT2 RS, Black 2018 Mercedes GLS63 AMG, Black, DD and TV 1997 BMW E31 840i, Black (fully restored!!)
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05-03-2018, 08:00 PM	#9
rr_m New Member 21 Rep 21 Posts Drives: F82 M4 GTS, F80 M3, F15 X5 Join Date: Mar 2017 Location: Dublin, CA iTrader: (0)	Just throwing it out there, but too many late shifts? I put an M5 into limp mode the first M school I did because I was banging the limiter too many times even though I thought I was shifting on time. (I just put a Smartycam in my GTS with ECU connection and my shifts are actually coming at a higher RPM than I was even aware.) But no, I've never had an issue with power loss during a hard 30-minute session. Rr
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05-04-2018, 07:33 AM	#10
RandyC54 Salty Middle Aged Dog 142 Rep 165 Posts Drives: 2016 M4 GTS Join Date: Feb 2017 Location: Richmond, VA iTrader: (0)	Pat's mystery (and misery) continues. All good ideas, so keep 'em coming! Our dealer continues to investigate, including asking me to bring mine over yesterday so they could do some comparisons. This guy won't put in seats and harness until he's sure the car is sound for hard track use, so I guess his safety does have a price tag. __________________ 2018 Porsche GT2 RS, Black 2018 Mercedes GLS63 AMG, Black, DD and TV 1997 BMW E31 840i, Black (fully restored!!)
	Appreciate 0 Quote