steve0827

8k miles is ~12k KM. Sounds about right for most GT4-class cars in pro racing (i.e, replace the motor at first sign of issue), other than the BMWs which do 30k KM before requiring a refresh.

thuggo

Previous gens of the GT4 CS were lasting 30k km or so...if not more. The engine was one of the strongest components.

steve0827

Not saying that isn’t true. I can only speak to currently homologated cars. We run a GT4RS and have run g82 m4, Aston, and looked closely at the other options over the past two years.

All depends on the use case. With IMSA/SRO we’re limited to the current gen cars.

Daytonars4

I was being generous when I said 8k miles. I’ve seen several that had failures at 3-5k. But you would know better than me. Seems it was mainly PDK related issues? The Aston’s are 15k km. I just had a buddy who bought one at 16k. Leakdown is still 3-5% range. So seems they are conservative. Same motor that the AMG’s run that get 50k km. But the Aston’s don’t have dry sump. Supra and BMW as you mentioned are getting 20-30k. Being NA still does certainly put the 4RS at a disadvantage for longevity. Just the price to pay for running a Cup motor it seems.

I did find that M-Engineering is offering PDK calibrations for $1k. I plan to reach out to them to see their thoughts. Getting auto mode to shift at 8400 along with adjusting the dash to 8400 redline would keep me from having to mess around with ecu calibrations which is my preference. I’m sure if I touch the ecu Porsche will blame me if there’s ever an issue. Considering the power curve it just doesn’t seem worth running to redline in amateur settings.