car overheats at the track
#1
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
track day In Laguna-Seca today with HOD
10 minutes into the session the temps were:
On the way home the temps were normal (195 / 185)
Outside tnmp was ~90F
The oil and coolant temps were measured with an AIM Solo-DL connected to the CAN bus
The car is a 2009 C4S
I already have
* 3rd radiator
* external PDK cooler
Any ideas what else I could do?
10 minutes into the session the temps were:
- Oil: 265F
- Coolant 235F
On the way home the temps were normal (195 / 185)
Outside tnmp was ~90F
The oil and coolant temps were measured with an AIM Solo-DL connected to the CAN bus
The car is a 2009 C4S
I already have
* 3rd radiator
* external PDK cooler
Any ideas what else I could do?
#3
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
A few of questions:
- Have you seen these temp levels in the past?
- Any recent servicing, additions or maintenance to the cooling system?
- How old is the water pump and if not factory, what brand?
- What coolant is being used and what is the mix ratio with water?
- How many miles on the engine (if not original) and cooling system?
- Have you seen these temp levels in the past?
- Any recent servicing, additions or maintenance to the cooling system?
- How old is the water pump and if not factory, what brand?
- What coolant is being used and what is the mix ratio with water?
- How many miles on the engine (if not original) and cooling system?
Last edited by CAVU; 06-11-2022 at 12:50 PM.
#4
RL Community Team
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Basically, has something changed?
Thanks.
Karl.
#5
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Some good questions above. Also, are your radiators clean? Stuff can get trapped between the condensers and radiators and impact cooling performance.
Since you're in CA where It doesn't get too cold you could try going to 40/60 coolant/water, that'll somewhat improve the ability of the system to remove heat.
Since you're in CA where It doesn't get too cold you could try going to 40/60 coolant/water, that'll somewhat improve the ability of the system to remove heat.
#6
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Forgot where I got it. It was for a Cayman, something like this. https://www.tpcracing.com/product/ra...on-cooler-kit/
But due to the different engine/PDK layouts between Cayman and Carrera it was *not* plug & play
But due to the different engine/PDK layouts between Cayman and Carrera it was *not* plug & play
#7
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
A few of questions:
- Have you seen these temp levels in the past?
Yes, but only a couple years ago, but as I said yesterday was an unusually hot day
- Any recent servicing, additions or maintenance to the cooling system?
Nope
- How old is the water pump and if not factory, what brand?
it's the original water pump
- What coolant is being used and what is the mix ratio with water?
The OEM Porsche coolant 50/50
- How many miles on the engine (if not original) and cooling system?
- Have you seen these temp levels in the past?
Yes, but only a couple years ago, but as I said yesterday was an unusually hot day
- Any recent servicing, additions or maintenance to the cooling system?
Nope
- How old is the water pump and if not factory, what brand?
it's the original water pump
- What coolant is being used and what is the mix ratio with water?
The OEM Porsche coolant 50/50
- How many miles on the engine (if not original) and cooling system?
So probably next step is to replace the water pump and change the coolant mixture?
Trending Topics
#8
Intermediate
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My 991 C2S with 3rd radiator would reach 265-270F oil temp at Laguna when the outside air temps were high. And 90 OAT is getting up there. I considered it normal for the conditions. I would do a cool down lap and continue to drive in the pit area until the temp was around 200 before I shut it down.
The following users liked this post:
Hatzenbach (06-11-2022)
#9
Addict
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
track day In Laguna-Seca today with HOD
10 minutes into the session the temps were:
On the way home the temps were normal (195 / 185)
Outside tnmp was ~90F
10 minutes into the session the temps were:
- Oil: 265F
- Coolant 235F
On the way home the temps were normal (195 / 185)
Outside tnmp was ~90F
Things I would check:
- Are the radiators clear of road debris?
- Do you have radiator screens? Some of the designs are very restrictive and actually increase operating temperatures
- Is the bumper bottom behind the center radiator fully cut out. It can be cut quite a bit (see below)
- Do the operating temperatures go down as you turn the cabin heat on?
- Are you running both radiator fans? If you use the car mostly on the track, you can actually remove one radiator fan.
Some people are using Water Wetter with good results Red Line Synthetic Oil. WaterWetter® (redlineoil.com)
![](https://cimg7.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1504/img_1971_8f29b20c22b5eab901caf1d4f604e0af776a46d7.jpg)
The following 2 users liked this post by Frank 993 C4S:
CAVU (06-11-2022),
Hatzenbach (06-11-2022)
#10
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My 991 C2S with 3rd radiator would reach 265-270F oil temp at Laguna when the outside air temps were high. And 90 OAT is getting up there. I considered it normal for the conditions. I would do a cool down lap and continue to drive in the pit area until the temp was around 200 before I shut it down.
#11
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
If you look at the Redline data, Water wetter really doesn't do much if you're running a 50/50 water/coolant mix. Which makes sense, the coolant manufacturers add a surfactant of their own.
I guess you could check the water pump, but it's not the first thing I'd suspect. I mean, I've seen some photos on the 9A1 engine where the composite pump vanes had cracked or degraded, but I don't think that's super common. At 60K my OEM pump looked new.
I guess you could check the water pump, but it's not the first thing I'd suspect. I mean, I've seen some photos on the 9A1 engine where the composite pump vanes had cracked or degraded, but I don't think that's super common. At 60K my OEM pump looked new.
#12
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I too was at Laguna yesterday, in group C. I don’t have the CANBUS data logging that you have, but my car ran real hot as well, going off of the dash gauges. Oil temp read 275° and maybe even slightly higher. Water temp gauge is pretty useless, but it did move off the 175° mark ever so slightly. My new Sport Cup 2 Track Connect tires saw as high as 215°. No other track days have I seen these high of temps. My mechanic keeps claiming these temps are fine, but I still have my doubts. I can’t imagine what temps will be like in a month or two at places like Buttonwillow or Thunderhill!
#13
Intermediate
#14
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I too was at Laguna yesterday, in group C. I don’t have the CANBUS data logging that you have, but my car ran real hot as well, going off of the dash gauges. Oil temp read 275° and maybe even slightly higher. Water temp gauge is pretty useless, but it did move off the 175° mark ever so slightly. My new Sport Cup 2 Track Connect tires saw as high as 215°. No other track days have I seen these high of temps. My mechanic keeps claiming these temps are fine, but I still have my doubts. I can’t imagine what temps will be like in a month or two at places like Buttonwillow or Thunderhill!
I was in the Riviera Blue 997.2 C4S
Good to hear I was not alone with the high temps
![](https://cimg3.ibsrv.net/gimg/rennlist.com-vbulletin/1657x911/image_41af043c2fc208cb00b4ced058845a9c1fadc5cf.png)
#15
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I believe at 275 the oil starts to shear and I don't need a 3rd ride in the cab of a flatbed truck from Laguna back home
Yeah, I won't be going to B'Willow or T'Hill this year for exactly these reasons...