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07-10-2019, 04:39 PM | #1 |
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Stroker build
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
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07-10-2019, 04:40 PM | #2 |
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Updated the graph of the different states of tunes vs the Alekshop engine, here it is
Bear in mind all the dynos are in STD vs my stroker which is SAE. SAE which reads lower. The day I get a dynojet we can compare both of them on the same graph done properly, but this is interesting meanwhile Conclusions: From 5500 to +8000 this stroker makes way more whp than the Alekshop. It is clear that between the internals and the 292 cams/headers/Karbonius airbox the car has more hp pretty much everywhere. If you look at whp average from 7000 to 8000 this is at least as powerful as a 595 supercharger kit
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Last edited by SYT_Shadow; 07-19-2019 at 04:10 PM.. |
07-10-2019, 04:41 PM | #3 |
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Here's a video of it at the track
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Last edited by SYT_Shadow; 06-15-2020 at 01:39 PM.. |
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07-10-2019, 04:53 PM | #4 |
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WOW!!!!! that is some real power gain there, i would love to ride in this car!
Next time im visiting my family in CT, i hope i can drop in and hear this car in person!
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07-10-2019, 05:06 PM | #5 |
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totally woke me up from my afternoon food coma
Would love to see/hear clips of this unicorn in real action
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07-10-2019, 05:29 PM | #7 |
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definitely, just don't make it in winter as the car will be hibernating
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07-10-2019, 05:30 PM | #8 |
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in theory yes! it'll be its first track day but still missing a lot to be able to track the car, alignment, tires, etc
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07-10-2019, 05:33 PM | #9 |
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Very nicely done!
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07-10-2019, 05:49 PM | #10 |
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Well played. Those numbers are pretty great sir!!
Did you ever post about the details on how your old engine failed? Well done.
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07-10-2019, 06:02 PM | #11 |
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I have not disassembled it yet. As you see, I do things slowly but they eventually get done!
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07-10-2019, 06:06 PM | #13 |
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07-10-2019, 06:07 PM | #14 |
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It's hard to post a video but I'll see what I can do
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07-10-2019, 06:10 PM | #16 | |
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Quote:
Redline is at 8600 iirc Headwork was done. I don't have the details |
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07-10-2019, 06:23 PM | #17 |
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Holy moly and it looks very tractable below 3k also? Nice work guys
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07-10-2019, 06:31 PM | #18 |
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07-10-2019, 07:16 PM | #19 |
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Incredible! Nice work Danny!
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07-10-2019, 07:37 PM | #20 |
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Dope I saw Img post the car on their Instagram. Amazing
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07-10-2019, 07:51 PM | #21 |
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500 rwhp and 370 lbs rwtq NA would make one of these cars very responsive and pretty quick. Unfortunately it’s often twice the cost of a supercharger kit, but if you need a motor anyway, you are halfway there.
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07-10-2019, 09:13 PM | #22 |
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Geez those are some serious numbers. Knowing that it is safe power I really think this is the dream build.
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