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Thanks for everything you guys post here. Also curious about the limp mode issues. Hopefully the 718 platform gets more popular for mods/tuning since there's hardly anything out there right now. Followed on IG and excited to see your progress with the car!
Edit: So did the car start working normally after it cooled down a bit? Or is it still throwing errors during normal use?
Thanks for everything you guys post here. Also curious about the limp mode issues. Hopefully the 718 platform gets more popular for mods/tuning since there's hardly anything out there right now. Followed on IG and excited to see your progress with the car!
Edit: So did the car start working normally after it cooled down a bit? Or is it still throwing errors during normal use?
Thanks for the follow!! During my last run (This is Pete from Suncoast) at Sebring in February I was on the 93 tune with race gas in it and I made it about 3 1/2 laps when the turbo shut down. Not many cars on track so while checking my mirrors I limped it around to T16 at Sebring and on the back straight I keep shifting through the gears up and down watching the gauges on the dash and the AP. About 3/4 down the back straight I felt a little boost coming back. I decided to try and stay out another lap and coming out of T17 it was back to full boost so I went for it again. I made it another two laps under full power and then came in. Very strange, like the turbo needs to catch it's breath.
I'll be completely honest, it's frustrating not being able to go more than 5 laps in a row in a very fast group, but we'll get it figured out.
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Thanks for the follow!! During my last run (This is Pete from Suncoast) at Sebring in February I was on the 93 tune with race gas in it and I made it about 3 1/2 laps when the turbo shut down. Not many cars on track so while checking my mirrors I limped it around to T16 at Sebring and on the back straight I keep shifting through the gears up and down watching the gauges on the dash and the AP. About 3/4 down the back straight I felt a little boost coming back. I decided to try and stay out another lap and coming out of T17 it was back to full boost so I went for it again. I made it another two laps under full power and then came in. Very strange, like the turbo needs to catch it's breath.
I'll be completely honest, it's frustrating not being able to go more than 5 laps in a row in a very fast group, but we'll get it figured out.
Did it ever actually throw up a CEL during the limp? Do you guys ever drive it on the street? Was it fine for street driving after?
Sorry about all the questions! I'm currently debating to either take my 718 S and just dump lots of money into mods and keep it long term or trade it in for the new 718 GT4 when that comes out. The appeal of the turbo with a tune for daily driving is making it hard. I know the GT4 will feel like a dog in day to day driving in comparison. Guess it's a good problem to have! I'm hoping your headers and custom exhaust really wake up the sound of the engine. Can't wait to hear that.
Did it ever actually throw up a CEL during the limp? Do you guys ever drive it on the street? Was it fine for street driving after?
Sorry about all the questions! I'm currently debating to either take my 718 S and just dump lots of money into mods and keep it long term or trade it in for the new 718 GT4 when that comes out. The appeal of the turbo with a tune for daily driving is making it hard. I know the GT4 will feel like a dog in day to day driving in comparison. Guess it's a good problem to have! I'm hoping your headers and custom exhaust really wake up the sound of the engine. Can't wait to hear that.
The car has never thrown a CEL on the instrument cluster, but has codes in the Accessport. Constant Turbo/Super Charger Underboost and the wastegate actuator failure keep popping up. We very rarely street drive it, it sits in the showroom most of the time. We'll take it to car shows and whatnot, but we usually trailer it anywhere longer than a 30 minute drive. Once it cools down it will run perfectly fine until we put it on track again. For instance, we can come off track in limp mode, let it cool for 20 minutes then drive into town, hotel, food etc and be fine.
The car has never thrown a CEL on the instrument cluster, but has codes in the Accessport. Constant Turbo/Super Charger Underboost and the wastegate actuator failure keep popping up. We very rarely street drive it, it sits in the showroom most of the time. We'll take it to car shows and whatnot, but we usually trailer it anywhere longer than a 30 minute drive. Once it cools down it will run perfectly fine until we put it on track again. For instance, we can come off track in limp mode, let it cool for 20 minutes then drive into town, hotel, food etc and be fine.
I take it the oil temps are in check and that's not causing the limp mode? The codes for underboost and wastegate actuator failure makes me think the wastegate arm and valve is seizing. So you've been going WOT for a while, turbo gets nice and toasty, everything thermally expands and maybe causing the arm to seize with respect to the turbine housing. Might be worthwhile to pull off the turbo and check the operation of the wastegate. Internal wastegates do wear out over time. You can get exhaust soot built up between the arm and bushing, get galling, etc. That's why motorsports turbo setups use external wastegates as they are more durable.
The car is constantly going into what appears to be a "turbo limp mode" because engine temps are getting to high. The Accessport read Turbo/Super Charger Underboost and another code for wastegate actuator failure. After 5 laps in multiple sessions the car looses all boost and we have to limp it back around. We know it's not tune or fuel related because we ran the car on the Cobb 93 Tune, 91 Tune, Stock Tune, and we ran 98 octane VP fuel from the track. We tried Sport Mode/Auto, Sport Plus/Auto, Sport Mode/Paddles/ and Sport Plus/Paddles. Same issues on every run. Oil temps were reading 314 degrees and the IAT was over 550 degrees on the Accessport. The car display screen was showing 235 oil temp.
We think it could be a sensor or some mechanical failure. We ran logs on all of those tunes with the same driver so speeds are consistent throughout. John Tecce from BGB Motorsports and COBB Tuning are both looking at them. We will keep you updated on what's going on with the car.
Just saw this. Often times, the reading on the car display is just a stupid/dummy value and the 314F oil temp is what's the true value. There's some other thread with regards to coolant temp where the dash shows a constant 190F or so though the actual is between 180F to 220F or so. Numerical equivalent of the standard cold/warm/hot 3-position gauge that is typical on cars because your average customer starts asking too many questions if the gauge keeps on changing value and freaks out. Do you have a datalog showing the oil temp trend over the session? That should show pretty quickly if it's a sensor issue or not.
I take it the oil temps are in check and that's not causing the limp mode? The codes for underboost and wastegate actuator failure makes me think the wastegate arm and valve is seizing. So you've been going WOT for a while, turbo gets nice and toasty, everything thermally expands and maybe causing the arm to seize with respect to the turbine housing. Might be worthwhile to pull off the turbo and check the operation of the wastegate. Internal wastegates do wear out over time. You can get exhaust soot built up between the arm and bushing, get galling, etc. That's why motorsports turbo setups use external wastegates as they are more durable.
That is one of our techs told us when we called from the track. He told us to check the diverter valve (complete operational and not getting stuck) and also the wastegate, which on these cars so far underneath the car and under all the cover panels it was impossible to get to it on ramps at the track. Everything has to come out for the new Soul Performance downpipe and exhaust so we'll give everything a nice look over.
Originally Posted by spdracerut
Just saw this. Often times, the reading on the car display is just a stupid/dummy value and the 314F oil temp is what's the true value. There's some other thread with regards to coolant temp where the dash shows a constant 190F or so though the actual is between 180F to 220F or so. Numerical equivalent of the standard cold/warm/hot 3-position gauge that is typical on cars because your average customer starts asking too many questions if the gauge keeps on changing value and freaks out. Do you have a datalog showing the oil temp trend over the session? That should show pretty quickly if it's a sensor issue or not.
The car is always reading in the 220F range for oil and never moves, same with coolant temps. The Accessport is what was reading well over 300F oil and intake temps in the 550+F range
That is one of our techs told us when we called from the track. He told us to check the diverter valve (complete operational and not getting stuck) and also the wastegate, which on these cars so far underneath the car and under all the cover panels it was impossible to get to it on ramps at the track. Everything has to come out for the new Soul Performance downpipe and exhaust so we'll give everything a nice look over.
The car is always reading in the 220F range for oil and never moves, same with coolant temps. The Accessport is what was reading well over 300F oil and intake temps in the 550+F range
550+ IAT is crazy unless the car is literally on fire. Coolant gauge is a dummy. In the same vein I would also question the oil temps. Pulling the OBD 2 readings on my 718 CGTS showed no more than 245 degree oil temps which is higher than the dash gauge by about 10 degrees. This was in Sept 2018 Sebring 95 degrees and 95% humidity windows up and AC on. Car never missed a lick and was not loosing power over the session and still hit the same Vmax into turn 17 on the last lap of the session.
550+ IAT is crazy unless the car is literally on fire. Coolant gauge is a dummy. In the same vein I would also question the oil temps. Pulling the OBD 2 readings on my 718 CGTS showed no more than 245 degree oil temps which is higher than the dash gauge by about 10 degrees. This was in Sept 2018 Sebring 95 degrees and 95% humidity windows up and AC on. Car never missed a lick and was not loosing power over the session and still hit the same Vmax into turn 17 on the last lap of the session.
Peter
The S and GTS use different turbos and Porsche is aware of the heat soak issues with the S cars. One of our guys was at the PEC in Atlanta last month and while riding around the track they were talking about it. It hasn't been brought up in a major announcement yet (probably because not many 718's are being pushed this hard) but Porsche definitely knows about it.
The S and GTS use different turbos and Porsche is aware of the heat soak issues with the S cars. One of our guys was at the PEC in Atlanta last month and while riding around the track they were talking about it. It hasn't been brought up in a major announcement yet (probably because not many 718's are being pushed this hard) but Porsche definitely knows about it.
What specifically about the GTS turbo prevents it from heat soak unlike the S?
Is the GTS more suited for track duty?
You've already added the third radiator just like the GTS has.
Hmm. I ran a 3-day at COTA, on the stock tune, in 100-105 degree temps without any issues at all. No 3rd radiator yet, it's my next mod.
Granted, stock tune.
Oil temps on the display were showing high by the end of the sessions (260-270) but I'm not too worried about that since the modern synthetics can do that all day long with no issues.
I did feel like the car may have been off a few ponies by the end of the session due to the heatsoak, but it wasn't super significant.
I'm really interested in more feedback from people tracking these cars. I am hoping more "supporting mods" come out soon to help us keep these turbo motors happy for many track days and a long engine life. I also hope someone's able to figure out a better heat exchanger situation for the intercooler as apparently that's a big roadblock to more power right now.
Hmm. I ran a 3-day at COTA, on the stock tune, in 100-105 degree temps without any issues at all. No 3rd radiator yet, it's my next mod.
Granted, stock tune.
Oil temps on the display were showing high by the end of the sessions (260-270) but I'm not too worried about that since the modern synthetics can do that all day long with no issues.
I did feel like the car may have been off a few ponies by the end of the session due to the heatsoak, but it wasn't super significant.
You may want to call Charles at LN Engineering or Lake at Driven Oils and have a chat with them about "modern synthetics"
best regards,
John Gaydos
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Oil temps on the display were showing high by the end of the sessions (260-270) but I'm not too worried about that since the modern synthetics can do that all day long with no issues.
Keep in mind that if your oil temps are that high, your whole engine is running hotter. So it'll make less power, etc. Also, oil viscosity is going to be quite low at those temperatures which reduces the load bearing capacity of all the engine bearings and any place where oil is used to prevent metal-on-metal contact. Plus, the materials of the engine bearings themselves don't like being too hot. In my track car, I make sure I have enough cooling capacity to keep the oil around 240F.
03-26-2019, 11:42 AM
I'm hoping your headers and custom exhaust really wake up the sound of the engine. Can't wait to hear that.
