After much internal pondering, we’ve decided to post this for the betterment of humanity
There continues to be a lot of debate whether stroking an S65 is ‘worth it’.
For us, a NA engine’s response, intake sound and power delivery are always worth it, but it’s also clear that previous strokers were not really moving the envelope in terms of max power.
We absolutely know there are cheaper ways to get more hp, but not ones that sound quite as good (queue Karbonius intake) or (hopefully) can withstand 1h back-to-back sessions at the top 10% of the pace at the event.
Hopefully this is a constructive thread. Please note we’re not engine builders or involved at all in buying/selling of car stuff
Backstory:
We use our E90 as a streetable track car, it primarily sees double duty at HPDE’s. Last year the engine blew up (long story
here), and after considering our options we decided to go for a stroker build. This is the pinnacle of M engines and making it better is a very attractive proposal!
Base – stock car (pulleys only): 371whp
After adding the following components, we got up to 412 whp:
Bimmerworld tri-y stepped headers
Bimmerworld Xpipe, fully catless
Karbonius intake, Dinan filter
284 Schrick cams
Rk dyno tune
93 octane
Finally we can get to the purpose of this thread: the stroker! Build and test details (adding onto 412 configuration):
Tuner:
Jordan @ RK Tunes
Fuel:
Regular 93 pump
Stock ECU - no standalones, thank you very much
292 Schrick cams (maintains full VANOS)
4.6L
stock compression ratio
93 octane
Same dyno as the 412whp result
Here are the results:
Here is the car and engine bay in all its glory
Many thanks to:
Izzy we would not have gone so deep into the dark end without your help. Incredible build!
Corry you are the Mozart of engine building
Jordan @ RKtunes, there is so much talk about tuner this and tuner that, but you are the real deal!
Phil @ Bimmerworld for his consistently great advice on building a streetable track car
David and Ana @ Karbonius for building this great intake (such glorious music!)
Robert for paving the way for all the cool S65 builds
Arne @ Schrick for the breakthrough info that 292 cams can mantain VANOS in the S65