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Thread: Post-Rebuild Twin Screw Dyno

  1. 02-17-2009, 12:39 PM #1
    Neil
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    Post-Rebuild Twin Screw Dyno

    RRT just finished rebuild of my twin screw S52. Stayed with stock compression, but went with CP pistons, RMS headers (SwainTech coated), ARP 2000 studs w/stock Elring headgasket, upgraded oil pump, and improved cooling system. Still using "stock" OBDII tuning that Jim Conforti provided for Eurosport's kits.

    Motor was broken-in last week on a DynoDynamics 450 Eddie Loading dyno at Function:TUNED, a tuning shop around the corner from RRT in Dulles, VA. DynoDynamics read consistently lower than Mustang dynos and, according to some reports, approx. 14%-16% lower than Dynojets.

    Rebuilt motor -- which should get stronger as it loosens up -- showed 348 rwhp and 310 ft-lbs. Didn't get chart from the shop, but will post one when I get car on a Dynojet early next month.

    I'm very pleased!

    Neil
    Last edited by Neil; 02-17-2009 at 08:14 PM.
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  2. 02-17-2009, 12:44 PM #2
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    Great news Neil!! Just in time for HPDE "season" too!!

    What boost you at?

    Don
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  3. 02-17-2009, 12:48 PM #3
    Neil
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    I'm using the stock pulley that Eurosport provided. IIRC, I was somewhere around 9.5 psi. I'm sure that I now have less boost because of the headers.

    Just got the car back last night and haven't had a chance to re-set/re-calibrate the boost gauge. I'll report back once I've done so.

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  4. 02-17-2009, 01:13 PM #4
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    What caused you to do the engine re-build, too many track hours? I know your's didn't ingest a supercharger like mine did.
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  5. 02-17-2009, 01:24 PM #5
    Neil
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    Quote Originally Posted by Jim M3 View Post
    What caused you to do the engine re-build, too many track hours? I know your's didn't ingest a supercharger like mine did.

    Jim -

    After 117,000 miles -- an awful lot of which were on track -- motor was tired, as revealed by leakdown test.

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  6. 02-17-2009, 01:26 PM #6
    Matt
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    117k with the TS?

    That's awesome, Neil.
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  7. 02-17-2009, 01:31 PM #7
    Neil
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    Quote Originally Posted by Matt View Post
    117k with the TS?
    Not quite, got boosted at 48,000 miles. So ONLY 69,000 MILES with the twin screw (and no regrets!)
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  8. 02-17-2009, 02:09 PM #8
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    Quote Originally Posted by Neil View Post
    Not quite, got boosted at 48,000 miles. So ONLY 69,000 MILES with the twin screw (and no regrets!)

    ...not to mention a LOT of those miles were HPDE's too. And not at some snail's pace around various road courses either. That's a great testament to wise component selection by a smart owner.

    Don
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  9. 02-17-2009, 02:46 PM #9
    JamesM3M5
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    Yeah, that's one thing about this Eurosport TS - bulletproof reliability. I think he had the input bearing unit replaced with an updated unit from Eurosport about 2 years ago, but otherwise the system has been nothing but amazing.
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  10. 02-17-2009, 04:29 PM #10
    Neil
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    Quote Originally Posted by JamesM3M5 View Post
    Yeah, that's one thing about this Eurosport TS - bulletproof reliability. I think he had the input bearing unit replaced with an updated unit from Eurosport about 2 years ago, but otherwise the system has been nothing but amazing.
    True on both counts. Wouldn't have had to replace the bearings had I kept the gearcase properly filled with oil!

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  11. 02-17-2009, 04:44 PM #11
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  12. 02-17-2009, 04:52 PM #12
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    nice numbers Neil, any build specs?

    Those headers are badass aren't they!?

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  13. 02-17-2009, 04:52 PM #13
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    Very nice Neil! It's a shame that nobody makes these kits anymore.
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  14. 02-17-2009, 05:14 PM #14
    Neil
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    Quote Originally Posted by jmc View Post
    nice numbers Neil, any build specs?

    Those headers are badass aren't they!?

    Jmc
    With exception of stuff I listed in first post, a pretty stock rebuild. The CP Pistons were first overbore (+.025"??), otherwise nothing special.

    And yes, the headers are very nice (thanks Marco)!

    Neil
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  15. 02-17-2009, 05:23 PM #15
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    Quote Originally Posted by Neil View Post
    And yes, the headers are very nice (thanks Marco)!

    Neil
    Did Marco fabricate them?
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  16. 02-17-2009, 05:31 PM #16
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    Quote Originally Posted by BigM62 View Post
    Did Marco fabricate them?
    no..but I did practically pull them out my butt...
    Hard to find these headers new anywhere....

    I will have them available soon, the jig is being made...
    And I am having my guy make a jig for my own version of an AA front half track pipe to mate up to them...2.25 pipe up to the headers..prefit for the headers, and a TRUE 3 inch collector( not a smaller tapered collector)..to join to the rear half trackpipe, or aA race exhaust, or whatever you want to bolt up to it...
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  17. 02-17-2009, 07:09 PM #17
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    Very nice numbers Neil! Any comments as to how your motor was broken in? I'm curious
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  18. 02-17-2009, 08:12 PM #18
    Neil
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    Pretty much followed the MotoTune approach:


    http://www.mototuneusa.com/break_in_secrets.htm

    Neil
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  19. 02-17-2009, 10:40 PM #19
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    good stuff! my rebuild should be done by july, hopefully earlier.

    If your M3 doesn’t have 3 pedals and 2 doors, I would really consider contacting BMW to confirm the authenticity of your incorrectly badged mid-sized family sedan.
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  20. 02-18-2009, 12:46 AM #20
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    Quote Originally Posted by Neil View Post
    Pretty much followed the MotoTune approach:


    http://www.mototuneusa.com/break_in_secrets.htm

    Neil
    I don't know why by that still scares me.
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  21. 02-18-2009, 10:04 AM #21
    woodym3
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    Quote Originally Posted by BigM62 View Post
    Congrat's to one of my favorite cars.
    Ditto. Too bad it can't do the One Lap of America this year.
    Last edited by woodym3; 02-18-2009 at 10:06 AM.
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  22. 02-18-2009, 12:09 PM #22
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    Quote Originally Posted by BigM62 View Post
    I don't know why by that still scares me.
    Its proven to work really well tho!
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  23. 02-18-2009, 01:49 PM #23
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    Good that is all back together. I remember seeing the shelves of parts for your car, not to mention the engine and blower just chillin there at RRT...
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  24. 02-18-2009, 08:21 PM #24
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    Neil,

    Did you keep the oil level sight glass thing? The oil seperator I added has captured not a single drop of oil.



    good stuff! my rebuild should be done by july, hopefully earlier.
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  25. 02-18-2009, 09:00 PM #25
    Neil
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    Quote Originally Posted by Johno View Post
    Neil,

    Did you keep the oil level sight glass thing?
    Most definitely.

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