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Latest update on my 718CS with wrapping/undertray mods. As detailed above, I have had no limp issue since having these done. My front bumper had to be off for something unrelated, so I decided to go ahead with third radiator (Thanks Chris/Dergarage/cbracerx!).
Just ran a two day event at Thunderbolt. Oil temps were about 20 - 30 F lower than previously experienced. Somewhat apples to oranges since different tracks and weather, but my oil temp maxed out at about 243 whereas I had seen 271 on Lightning and 268 at the Glen with two radiators.
My conclusion (YMMV) is that the third radiator isn't necessary or sufficient to cure limp mode by itself, but is a nice adjunct to run cooler once you're generating higher oil temps with undertray/wrapping fixes for limp mode. Hopefully this will contribute to longevity.
glad to hear that things are going better for you.
obviously other than cost there is no downside to adding the 3rd rad however it has been proven to not help with the heat soak issue. i tried that and the upgraded servo sensor and neither had any impact. i can't recall exactly where but i swear somewhere in this thread someone gave the reqson why the 3rd rad had no impact on this issue.
glad to hear that things are going better for you.
obviously other than cost there is no downside to adding the 3rd rad however it has been proven to not help with the heat soak issue. i tried that and the upgraded servo sensor and neither had any impact. i can't recall exactly where but i swear somewhere in this thread someone gave the reqson why the 3rd rad had no impact on this issue.
My personal opinions as to why that's the case....
The turbo servo motor isn't cooled by a coolant loop. So the 3rd radiator wouldn't help at all because it's not part of that system. The turbo servo motor is cooled passively by air flowing over it. Unfortunately, in the case of the cayman underbody, there isn't a lot of airflow stock. Worse yet, if you were to get the servo heat soak error and stop the car entirely....it actually makes it worse unless you stop for a LONG time. Think about it, everything is blazing hot under there and now you have no air moving under the tray. This is why the best recovery method is to simply keep driving but go easy on the throttle and coast where you can. But bending the fins on the tray like I posted about helps scoop up air into the area around the turbo to ensure that air is directed at the servo.
My personal opinions as to why that's the case....
The turbo servo motor isn't cooled by a coolant loop. So the 3rd radiator wouldn't help at all because it's not part of that system. The turbo servo motor is cooled passively by air flowing over it. Unfortunately, in the case of the cayman underbody, there isn't a lot of airflow stock. Worse yet, if you were to get the servo heat soak error and stop the car entirely....it actually makes it worse unless you stop for a LONG time. Think about it, everything is blazing hot under there and now you have no air moving under the tray. This is why the best recovery method is to simply keep driving but go easy on the throttle and coast where you can. But bending the fins on the tray like I posted about helps scoop up air into the area around the turbo to ensure that air is directed at the servo.
Agree that turbo servo motor is not directly water cooled (that would be great!) but the turbocharger main bearing is. So is the engine oil and transmission oil (and PDK clutch oil if you are rocking the PDK). Having more capacity in the cooling system here in the muggy northeast is a good thing. It doesn't fix overheat of the servo, but it does offer a better chance to keep motor oil cooler longer.
I'm still going to work on a way to get the oil cooling further improved on the 718 Turbo, as it sometimes gets "too damn high" in long track sessions in West Virginia
just a quick question i have a base pdk and was wondering about the cobb ots stage 1 would that be a good upgrade ? i feel that the boost drops down at 6k rpm
Wow, it's been awhile since I've been on here. Lots of good news from you guys.
Here are my updates. I ran 3 track weekends this year with my wife. I ran WITHOUT the tray this season. Generally, my wife ran the beginner group followed by me in intermediate. That's 40-50 minutes with maybe a 5 minute driver change in the middle. I did not run into hardcore limp mode like when I had the tray on. However, I noticed a slight drop of power when my oil temps hit 250. This usually happened only after a couple of laps because my wife lovingly warmed up the car for me.
On our last track day, I got moved up to advanced. So I ran followed by my wife. It still eventually got to 250 but now I had about 10 minutes of full power compared to 3-5 minutes when I followed my wife. My wife has never noticed limp mode since she isn't fast enough yet. Don't tell her I said that. We only had one session of this configuration before this happened.
This just happened last week. Haven't had the tire taken off yet. Hopefully we can determine the root cause with the tire off. This was a brand new tire and had maybe 300 miles of street use.
Sorry for the tangent there. Anyways, my season is done. I think I'm going to bend that tray and put it back on for next season. Also have a downpipe I'm going to wrap in heat wrap when my warranty expires in about 6 months.
I also just bought my wife a base 987.2 Boxster so she doesn't eventually steal my 718 from me.
About my car: 2017 718 BS stock except for soul valved exhaust and upgraded air filter.
Another quick update from me (see prior posts 2018 CS PDK stock drive train and exhaust). Another warm (80's) day on Lightning beating the car hard in the advanced group at Moe (Motorsports Enthusiasts) HPDE. Still flawless; full power all six sessions.. At the risk of jinxing myself, I am ready to proclaim the undertray and wrapping mods as a cure.
I look at the third radiator as added insurance and an investment in engine and PDK longevity. You could probably skip that if you only track occasionally and aren't keeping the car long-term. I'm good to continue developing the car as my long term track toy. I was hesitant about going down the road with sears, cage, coilovers/LCAs, exhaust, etc. if the car would overheat frequently and I would have to pull it all for resale.
Wow, it's been awhile since I've been on here. Lots of good news from you guys.
Here are my updates. I ran 3 track weekends this year with my wife. I ran WITHOUT the tray this season. Generally, my wife ran the beginner group followed by me in intermediate. That's 40-50 minutes with maybe a 5 minute driver change in the middle. I did not run into hardcore limp mode like when I had the tray on. However, I noticed a slight drop of power when my oil temps hit 250. This usually happened only after a couple of laps because my wife lovingly warmed up the car for me.
On our last track day, I got moved up to advanced. So I ran followed by my wife. It still eventually got to 250 but now I had about 10 minutes of full power compared to 3-5 minutes when I followed my wife. My wife has never noticed limp mode since she isn't fast enough yet. Don't tell her I said that. We only had one session of this configuration before this happened.
This just happened last week. Haven't had the tire taken off yet. Hopefully we can determine the root cause with the tire off. This was a brand new tire and had maybe 300 miles of street use.
Sorry for the tangent there. Anyways, my season is done. I think I'm going to bend that tray and put it back on for next season. Also have a downpipe I'm going to wrap in heat wrap when my warranty expires in about 6 months.
I also just bought my wife a base 987.2 Boxster so she doesn't eventually steal my 718 from me.
About my car: 2017 718 BS stock except for soul valved exhaust and upgraded air filter.
Thanks for the update on your no undertray experience. Good luck with the "replacement" for your wife with a Base 987.2
As for the tire - wow that is quite a failure. It could be severe toe out on that wheel, severe negative camber, low tire pressure along with neg camber, a defective tire (possible but least likely given the wear seen). What does the tire look like on the driver's side?
Thanks for the update on your no undertray experience. Good luck with the "replacement" for your wife with a Base 987.2
She drove a friend's 987.2 Cayman S and said she loved it. So hopefully the power difference is acceptable for her.
Originally Posted by cbracerx
As for the tire - wow that is quite a failure. It could be severe toe out on that wheel, severe negative camber, low tire pressure along with neg camber, a defective tire (possible but least likely given the wear seen). What does the tire look like on the driver's side?
These were brand new tires and wheels I picked up on FB. They weren't even mounted when I bought them. I went with a "track" alignment that I googled. Car was a bit twitchy so I'm going to dial the toe back in the future.
Last edited by wutangmo15; 10-03-2023 at 12:10 PM.
Check the camber and toe settings on the right rear - I would not be surprised if they changed a lot. I don't see an aftermarket toe link in use and the stock one can slip under heavy use.
Check the camber and toe settings on the right rear - I would not be surprised if they changed a lot. I don't see an aftermarket toe link in use and the stock one can slip under heavy use.
The driver's side tire looks perfect.
Oh, good to know. Will definitely look into that. I'm all stock except with for front GT3 style LCAs.
My dash cam picked up a noise at 53 seconds that kinda sounds like blow off valves. But that is when I heard a loud pssssssssh. My other camera picked up a loud thud noise.
You can actually see the performance drop in this video. When oil temps aren't above 250 degrees, I usually get to 123-125 on the front straight.
She drove a friend's 987.2 Cayman S and said she loved it. So hopefully the power difference is acceptable for her.
i went from my '17 CS with every performance option other than pccb to a tuned and slightly modified 987.2 (typical stuff - plenum, tb, exhaust, etc) and i was happy. it doesn't have the low-end torque of the turbo but it's just as fun and fast to drive and they are essentially the same power.
07-23-2023 | 02:04 PM
