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      09-20-2017, 02:21 AM   #1
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Build thread for 4.4L stroker results in 61HP gain.

I'm hoping it's ok to link other forums

https://www.bimmerforums.com/forum/s...troker-install

.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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      09-20-2017, 03:13 AM   #2
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Looks like he's claiming ~150hp gain not 61 though.
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      09-20-2017, 04:28 AM   #3
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Repost..

http://www.m3post.com/forums/showthread.php?t=1414377
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      09-20-2017, 07:33 AM   #4
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Normally you don't get 15% more power from 10% more displacement (probably 5%) but this motor has higher compression at 12.5 instead of 12.0, head work to improve flow, custom cams and tuning.
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      09-20-2017, 10:38 AM   #5
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Quote:
Originally Posted by pbonsalb View Post
Normally you don't get 15% more power from 10% more displacement (probably 5%) but this motor has higher compression at 12.5 instead of 12.0, head work to improve flow, custom cams and tuning.
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      09-21-2017, 11:26 AM   #6
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Weeee!!!

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      09-21-2017, 11:38 AM   #7
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god damn that sounds good
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      09-21-2017, 02:47 PM   #8
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Originally Posted by ekological View Post
Weeee!!!

What a beautiful sound. Is that the capristo?
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      09-21-2017, 03:20 PM   #9
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Wow. That exhaust note made my pants move...
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      09-21-2017, 03:23 PM   #10
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Wow. That exhaust note made my pants move...
That's what she said...no wait...
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      09-21-2017, 03:25 PM   #11
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Quote:
Originally Posted by BrewRifle View Post
That's what she said...no wait...
I set that one up didn't I.... We are all still teenagers at heart.... our toys just got pricier.
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      09-21-2017, 04:10 PM   #12
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Sorry about the repost. I missed the original one.

Mods, feel free to merge if necessary.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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      09-21-2017, 04:17 PM   #13
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Weeee!!!

Damn it! I want more video. That thing's a beast!
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      09-21-2017, 05:11 PM   #14
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Yessir. Bimmerworld long tri-Y headers, Bimmerworld catted midpipe, and Capristo with the valves opened (haven't had time to run the vacuum line or the electronics). I plan on adding resonators to hopefully refine the sound a bit as it's too loud for tooling around the neighborhood.

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What a beautiful sound. Is that the capristo?
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      09-21-2017, 06:12 PM   #15
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No video...for obvious reasons...



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Damn it! I want more video. That thing's a beast!
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      09-22-2017, 04:35 PM   #16
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Quote:
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No video...for obvious reasons...

Hell yeah! That sounds great! Thx, I have a new ring tone.
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      09-22-2017, 06:41 PM   #17
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Quote:
Originally Posted by cliverman View Post
Quote:
Originally Posted by ekological View Post
No video...for obvious reasons...

Hell yeah! That sounds great! Thx, I have a new ring tone.
Great idea.
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      09-25-2017, 07:06 AM   #18
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Quote:
Originally Posted by pbonsalb View Post
Normally you don't get 15% more power from 10% more displacement (probably 5%) but this motor has higher compression at 12.5 instead of 12.0, head work to improve flow, custom cams and tuning.
Isn't there a big increase in torque with stroker motors?
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      09-25-2017, 07:15 AM   #19
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Definitely an increase but how much of an increase do you expect from 10% more displacement? I think 5% more torque is actually a lot. Here a tiny bit would have also been from the increased compression. But typically with more aggressive cams and headwork and bigger headers, you trade some low end power and torque for more top end power. I cannot recall whether he got full vanos travel or not with the bigger cams. This build would be like having your cake and eating it - at least as good as a modded stock block on the bottom end and probably a bit better plus way more upper midrange and top end. This was an expensive build with the best parts and custom dyno tuning.
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      09-25-2017, 10:35 AM   #20
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Wow, that's a lot of money for that. Makes me wonder why BMW didn't use their 4.4 in all their production M cars...would have been a nice farewell to their NA line up.
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      09-25-2017, 11:17 AM   #21
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Last I checked, a stock S65 puts out 414HP/300ft-lb and this stroker puts out 550HP/400ft-lb. A 33% increase isn't considered big?

Quote:
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Isn't there a big increase in torque with stroker motors?
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      09-25-2017, 12:53 PM   #22
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This is way more than just a stroker.
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