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Discussion Starter #1
Hey y’all,

I tracked my car today out at Circuit of the Americas. I had the car tuned with a Cobb Accessport with map v200 installed on it, and this was my first time tracking the car after modding the ECU. The car started entering limp mode on and off after about 3 laps. Pulled the car into the garage and got ECU codes p0299 which says the turbo is under boosting and p1254 of which I haven’t really found a good description.

At this point I uninstalled the access port and had no problem for the rest of the day. Has anyone encountered this before?
 

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I had a different tune (APR) and codes but same idea, temps got too high and boost was cut on track. Suncoast had to do some cooling work to support a tune on their tracked car. Seems like realistically this thing is going to need a better intercooler to support any increased power production for track use.
 

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I don't have 3rd radiator. 40 days on track without tune no issues, had issues with a tune. From what I've read just adding the 3rd radiator may help but won't be sufficient as it's specifically intercooler heat issues that are the first weakness.
 

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I had the same problem even with a 3rd radiator and decided to go catless to get some heat from the motor, it solved the problem,no issues since...
 

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Discussion Starter #9
To follow up here, the car started limp moding again without the accessport on. Looks like when oil temps got over 245 it would start limping.
 

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19 CGTS and 15 Macan S
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I don't have 3rd radiator. 40 days on track without tune no issues, had issues with a tune. From what I've read just adding the 3rd radiator may help but won't be sufficient as it's specifically intercooler heat issues that are the first weakness.
if you read the thread on Suncoast’s track car it isn’t intaketemperature problems. It’s the wastegate actuator on the S model’s turbo that overheats and throws it into limp and not able to build boost.

 

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Hey y’all,

I tracked my car today out at Circuit of the Americas. I had the car tuned with a Cobb Accessport with map v200 installed on it, and this was my first time tracking the car after modding the ECU. The car started entering limp mode on and off after about 3 laps. Pulled the car into the garage and got ECU codes p0299 which says the turbo is under boosting and p1254 of which I haven’t really found a good description.

At this point I uninstalled the access port and had no problem for the rest of the day. Has anyone encountered this before?
I’m assuming you have an S as well?
 

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if you read the thread on Suncoast’s track car it isn’t intaketemperature problems. It’s the wastegate actuator on the S model’s turbo that overheats and throws it into limp and not able to build boost.

That makes sense based on these system diagrams for the high temp (radiators, etc.) and low temp (charge air, etc.) cooling circuits. High temp cooling lines route directly to the turbo charger while the low temp circuit runs to the intercooler and affects charge air (intake) temperature that is routed to the turbocharger, so from a high level examination, it appears can both effect turbo temps, but high temp circuit is routed directly for turbo charger cooling.
 

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Discussion Starter #14
Well, fuck. Glad I found this out before I had any of the suspension work I had scheduled done next week. This is a huge deal breaker for this car. Not great at all.
 

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Well, fuck. Glad I found this out before I had any of the suspension work I had scheduled done next week. This is a huge deal breaker for this car. Not great at all.
From what I can find, it’s exclusive to the S as the gts uses different actuator. I think they’re trying to figure out how to swap them. I do know they’ve changed a ton of underpanels to add more flow and it’s significantly helped the issue.
 

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Discussion Starter #16
From what I can find, it’s exclusive to the S as the gts uses different actuator. I think they’re trying to figure out how to swap them. I do know they’ve changed a ton of underpanels to add more flow and it’s significantly helped the issue.
Looks that way until the posts over the last couple of weeks. Looks like they’re limp moding again with no end in sight. They put on the boxster engine plate, and a few other things. Porsche has acknowledged the issue internally with no fix, that’s not great.
 

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Does anyone have a photo of the offending actuator? I'm curious if it would be possible to create a heat sync or duct air to it using a naca duct or something...
 
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