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07-12-2019, 04:49 PM | #47 |
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Man what a machine, this is going to embarrass some serious metal on the circuit. Sub 2:00 at WGI incoming
I have serious spec envy x1000 |
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07-12-2019, 06:34 PM | #48 |
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07-14-2019, 09:17 AM | #49 |
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I'm impressed with the top end torque and how it does not drop off as drastically as other stroker dyno like below.
https://www.m3post.com/forums/showthread.php?t=849797 i wonder how much of it is attributed to the cams? |
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07-15-2019, 08:23 AM | #50 | |
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-It's the only build with Karbonius intake. The Karbonius is so much bigger than the stock one that if there was any restriction there it's gone now -Bimmerworld headers. Headers have marginal gains on stock displacement engines that are NA, but on a stroker like this it's likely they are a bigger influence -Headwork. The stock head is great but the exhaust ports are not fully CNC'd, so there has to be something to gain there -Finally the cams. Earlier Alekshop got like 24whp just from changing cams to 284s, but their graph still doesn't look good and drops off a lot at high rpms. The 292s avoid that. If they made 304s that accept Vanos I'd consider them as I think there is more to be had, but I'm not willing to lose Vanos to gain hp.
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07-15-2019, 09:11 AM | #51 |
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Congratulations SYT!! Proper dream coming through.
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07-15-2019, 03:27 PM | #52 | |
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07-15-2019, 03:50 PM | #53 | |
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It'll be a while until people do builds with just one of those mods to see where the most bang for the buck is |
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07-15-2019, 04:01 PM | #54 |
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I think people are scared to re-time their motors if they rip off the heads which I don't blame them. Sending S65 heads off to be ported/polished and cam install would be nice to see for stock bottom end guys looking for more NA power.
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07-15-2019, 04:11 PM | #55 | |
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I look forward to getting a dynojet so I can compare in the same graph vs the Alekshop engine and I bet there is no loss of power at low rpms |
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07-16-2019, 02:33 PM | #56 |
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Well done to everyone involved. Watching the engine come together at IMG was awesome and kudos for keeping it NA.
Now you can stop playing games and get a Pcar ..... you're welcome 😒 |
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07-18-2019, 12:14 AM | #58 |
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Awesome build broski!
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07-18-2019, 05:50 AM | #59 |
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Well done to all who contributed to this build...you guys really knocked it out of the park with this one!!
For all the N/A fanatics out there, I believe these are finally the numbers we've all been hoping (no praying!) are achievable from the S65. Let's hope it can withstand track abuse. I guess the stroke/bore/wrist pin size/rod type etc will all determine this. This has certainly aroused a 'stir' in me! Again, well done guys!! 👌 |
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07-18-2019, 07:08 AM | #60 | |
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500whp is a proper result! It will be tracked heavily and if it blows it blows, but given the engine builders I find it very unlikely. |
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07-18-2019, 07:16 AM | #61 |
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500whp/.83 (17% drivtrain loss)= 602 crank hp
602/4.6= 131 hp/L
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07-18-2019, 07:19 AM | #63 |
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finally an S65 build you can get behind! hehehe
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07-18-2019, 07:20 AM | #64 |
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Revving to 8500 helps get more air in and out of 4.6L. Makes at least the top end power more like what a 6.2L can do at lower rpm. Obviously still can’t have the low end power of a 6.2L.
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07-18-2019, 07:23 AM | #65 |
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It's still at 8600rpm, although it wasn't dyno'd further than ~8100 as you see from the charts. It was hot and humid in Long Island and the car spent half a day being dyno'd continually with a substandard fan
When it cools down we'll do some 8600 pulls to see if it can make any more power. Last night we had a engine build celebration and the builders still think there's more to be had, but we'll see. I'm happy as is, it feels infinitely more engaging than the F80 CS as you can imagine. |
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07-18-2019, 07:30 AM | #66 | |
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It sounds 100% freaking amazing-- like everything I love in an engine.
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... Have you considered fooling with the intake trumpet length at all? If you're going to rev it another 8500rpm, and can't cam it further, you might be able to shift the curve up/right with some shorter runners. Almost certainly you're outside of the design spec of the stock runners at this point
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