Opposer

I heard that 987 doesn't have cooler for a PDK, so my question is will PDK be ok if during a 15min track session I floor it for 5 mins (2 laps), then do a 3min cooling lap and than 2 laps again and a cooling lap after end of the session?
I change both liquids in PDK every 15k miles.

Is there a way to check PDK temp using ODB scanner? (987.2 doesn't have engine oil temp in ODB that's why i'm asking)

This sucker is unrepairable and goddamn expensive so i want to keep it healthy.

ProCoach

Unless you're doing this in Florida or Texas during the late spring through early fall, or the Southeast in July and August with the ambient temp above 90-95, you shouldn't have any issue. You could run as you like continuously for most 18-22 minute sessions.

Your car is one of the most popular cars running track events, at least at most of the tracks I go to.

They're not unrepairable. Atlanta Speed Works has been repairing quite a few over the last few years. Lot less than a new or exchange one.

Opposer

2,9 is popular on tracks? Really? why not S?

ProCoach

I meant the Cayman plaform in general, but I still see them. not everyone who wants to go to the track has an S.

Here's what a mildly modified 6-speed 2.9 (IMSA ST) can do around COTA in the wet.

ExMB

There had been issues with the 987.2 Cayman R on track due to it being lowered compared to the rest of the series. Porsche did not fix the cooling issue until the 981 series vehicles. They also did not acknowledge any issues on the 987s for warranty purposes. Caveat here is they advertised the R as track worthy.

schell

I had the LN cooler installed for peace of mind, I only do HPDE PCA groups but on Friday in Advanced group we have open track all day, sometimes I get 6 or 7 30 minute sessions.

Opposer

so should I worry on a 2.9? It's a much less powerful engine.

The temp in summer is 83f max in our region.

will PDK be ok for a 15min session or should I give it a rest in a middle of a session?

internet says that 987.2 has the same PDK heat exchanger as 981 and 982- its partnumber is 9G2 307 017 00

ProCoach

No. IME, you should not worry. Continue with your care regimen. No need to modify sessions up to 18-22 minutes for sure.

Belinko

LOL at "mildly modified" that thing is gutted, full race

ExMB

The Cayman R had 3 radiators; it had a center one which the 2.9 didn't. The PDK R also shared a housing with the Diff; only separated by sheet metal internally. Keep in mind that temps near the surface are higher than OAT measurements.
The PDK R had issues in 90+ OATs whereas the manual R did not. Its hard to tell what yours will do depending on your mods, etc. The R had the X73 suspension which lowered the car by almost 30mm over the base 2.9 version.

ProCoach

The R is a different beast with different thermal loads. The OP will be fine.

ExMB

Not doubting your background, etc. But are you sure? Do you know his location and the state of his mods? Climate has changed a bit.

Opposer

The temp in summer is 83f max in our region.

if a stock base cayman 265bhp, equipped with same heat exchanger as 330hp Cayman R won't do fine during a 15min session in such weather then it's just a bad car

Opposer

i've done some research.
It turned out that R 987.2 overheated because of the LSD. On 981 they added a heat exchanger for a diff. LSD emits lots of heat.

My car has open diff, weak engine and performs in pretty cool weather during short 15min sessions. I shouldn't have overheating issues at all

Am i right?

ProCoach

No mods, he stated max ambient well below the advent of thermal stress. Given his apparent experience level, it’s unlikely he will truly thrash it, as a factory or very experienced driver would.

Having worked with no less than a dozen clients with a wide variety of experience putting on somewhere around 90-110 minutes a day on track over the last ten years in 2.9 liter base Caymans, I am confident the OP will be ok.

In several cars, I had access to gearbox temps via data logging equipment. Well within normal limits.