Lucky if you don’t hit it. I didn’t hit it my first track weekend, and have hit it every track weekend since. First session of the day I can get about half way through, and then can get about 4 laps into any other session before it starts again. Only doesn’t happen when it’s really cold out. Willing to try anything at this point to fix it. Oil temps never read over 205 on the access port after installing the 3rd radiator, so oil cooling definitely won’t help. If anyone’s got the new sensor, I’d love to hear if it helps.

 

If you are driving at the limit on the track with R-compound tires lap after lap on a warm day (say ~86F track temp or higher), your oil temp with or without third radiator should reach 250F. At least this is what I see in my GTS and I think common for the 981 guys.

So if your oil temps were never over 205 it does suggest that oil temp is not the issue.

Although I would have thought that oil helps to cool the turbo so if you can get the oil temp down I assume it might help to reduce the temp of the servo.

I think you guys experiencing limp mode need to start logging your oil temps at the time to see if there is a pattern. Maybe oil temp is not the problem.

jns211 posted this on 718Forum for improved oil cooling but no consensus on whether it will help with the limp mode:

https://lnengineering.com/products/s...18-models.html

https://www.718forum.com/threads/ln-...6/#post-202414

 

I’m going out on Sunday this weekend. It’s supposed to be hot AF (99F) this weekend, so we’ll see what happens. I’ll keep my eye on the accessport to see what it reads for oil temps, and grab a capture for everyone’s info.

 

Follow up here: Only started limp moding at the end of the day, with the tune off all day (Generally if I turn the tune on, it starts limp moding early, then easy to get it back into limp mode for the rest of the day; even after turning it off). I grabbed an accessport log and it has everything...except oil temp :-(. Dash said 235, accessport said 210. I have no idea why they're different; but it seems the accessport is always 10-15 degrees lower than the dash reading. Sorry for the lack of data :-(

 

Sorry to hear that. That's really frustrating but doesn't sound like it is an oil temp problem given you only reached 235. What was the track temperature?

Have you tried the Suncoast mods to get more air flow into the engine bay?

Short of that good excuse to buy a CPO GTS? My stock GTS runs all day at 251-252F for ~ 12min sessions without missing a beat.

 

Air temp was 100F, so I’m guessing track temp was pretty high. Didn’t do any of the suncoast mods after they proved to not prevent the problem. I’m already too deep into the S to trade it in. Those are some pretty shorty sessions, I’m doing 40 and 30 minute sessions :-)

 

Tatum Racing were the first to put our 2 quart billet sump on their 718 race car. The added oil volume, like we previously have seen on 987.2 and 981 models, makes a huge difference on track. It solved their limp mode issues from what was relayed to our engineer and allowed them to run the car full sessions without going into limp mode.




https://lnengineering.com/bilt-racin...18-models.html

Although pricy, I also believe that the application of our HeaderShield process on the exhaust components would also reduce engine bay temps significantly. Although a different application, a race customer with a GTR recorded a 60 deg F drop in IAT after we wrapped the hot side of his turbo and exhaust.

https://headershield.com/

 

Hey Charles, thanks for the response. Random questions for you: With the 2 qt oil sump, would there be any problem getting your oil temps up to normal operating temperature on a car that’s your grocery getter, as well as your track car. Thanks!

 

Not at all. The engines oil to water heat exchanger does a really good job with getting the oil up to temperature quickly.

 

Hello Charles,

Good morning. How much lower does the pan hang beyond the OEM position? Would an underbelly pan be something that is necessary?

Cheers!
T.Marc Jones

 

We made sure that even the OEM heat shield fits it properly. Tatum did not report any issues with fitment or ground clearance. Pan sits roughly 1" lower.

 

I decided to solve this problem by buying a GT4. Thanks for the input, everyone.

 

Yea
h, good call!

 

The GT4 also runs very high oil temperatures, but not so much that you'll go into limp mode on the track, but still concerning for the longevity of the engine.

 

Moreso than the 981?

If I have to upgrade the cooling on the GT4, so be it. This issue with my Boxster S is frustrating because it’s an uncooled component that is apparently overheating due to ambient temperatures alone without any recourse.