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Thread: SC 740i build

  1. #1
    Join Date
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    2000 S/C 740i sport (03/99) Orient Blue

    SC 740i build

    Havent been on the FI section 4 a long time. I finally got to doing the upgrades for the car. Quite a long road as no one makes much in the way of Hi-perf stuff for the 7er, so i must be crazy or very determined.

    I am currently on the final leg of upgrades: Head P&P, Custom made oversize 1mm valves, titanium spring and retainers, custom SS tubular headers, intercooler & , larger S/C crank pulley, new hsf5 water/alcohol injection. Has been quite the adventure alot of time & money, huge amounts of research, but a lot of fun and hopefully will have the desired results.



    Last edited by BMW5868; 03-06-2008 at 07:40 AM.

  2. #2
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    Turbo 99' M3
    Very cool. I love V8 power...especially when boosted.

    Good luck with the rest of it. Keep us updated

  3. #3
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    1993 325i Turbo, 1990 M3
    Cool project! Keep us up to date with more pics as things progress.

    Nik
    1993 325i, M3 ZF tranny, laguna grun, Holset HX35 bottom mount .

  4. #4
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    01 4.4 S3 X5 03 4.6is
    Sounds like you'll need to give some love to the tranny after all this engine work.

    Nice project! Good luck!

  5. #5
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    That's got to be the strangest looking oil pan I have ever seen.

    Cool project, tho.

  6. #6
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    1993 325i Turbo, 1990 M3
    Hey, I didn't notice you were a Canuck too! Right on. Nice to see another FI north of the 49th.

    Nik
    1993 325i, M3 ZF tranny, laguna grun, Holset HX35 bottom mount .

  7. #7
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    Congrat's to a great project.What is Dinan S3 certified?I thought t hat was for E39 M5 and E46 M3?Also why the PnP on the M62 heads?I researched and was told very little benefit.Thanks
    Last edited by BigM62; 03-06-2008 at 01:36 PM.
    Vortech V2Ti Rebello Racing M62 4.9L E34. Not a race car, but a fun car.

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  8. #8
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    94 540,72 3.0CS,'13 WRX
    He did bigger valves, so they were already doing major head work. Why not do it at that point?

  9. #9
    Join Date
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    2000 S/C 740i sport (03/99) Orient Blue
    Quote Originally Posted by xatlas0 View Post
    He did bigger valves, so they were already doing major head work. Why not do it at that point?
    For every 1 cfm of air flow increase thru the heads translate to aprox. 1 hp increase in power in a naturally aspired engine and 1.2 hp for forced induction. So any restrictions that are present in a stock head that are corrected by polishing and enlarged by porting will have a direct result on HP output. The stock heads were quite bad - flow testing before & after resulted in a 42 cfm increase in flow and with the 1mm increase in valve diameter it went up to 56 cfm. FI gains in exhaust flow output are just as important so we are having a set of SS tubeular exh mani's made that should step up the HP by additional 12%. We are looking for a modest increase with heads PNP & exhaust of approx. 75 hp. Intercooler and W/I should result in 50 hp so based on current HP output should be about 565 HP.

    I not so worried about the tranny as the rear end and will probably look to a LSD and larger drive train.

    S3 certified is the same as with the M5 e39 series, Dinan way of rating how much money u spent - lol. Because i didnt add their braking system i will never get S4 / S5 but rest assurd the brembo BBK is far superior.

  10. #10
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    It really suprises me that there were such gains to be had for the heads on this car. Most of the engine builders have told me the I6 heads are very good and there are very little gains to the head work on those.
    1997 BMW M3/4 Cosmos Black Luxury Package 437whp 378 ft/lbs torque Dyno Dynamics Dyno
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  11. #11
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    Quote Originally Posted by Jim M3 View Post
    It really suprises me that there were such gains to be had for the heads on this car. Most of the engine builders have told me the I6 heads are very good and there are very little gains to the head work on those.
    I am conservative on my #'s, most spec data quote .27hp increase per increase in cfm for Non FI. Losses of 4% loss for walls, 14% for burrs or lip, 22% for turn radius, 28% for seat area, and the remainder for valve face, valve angle and throat area. So with this data you can see that most of the gains are not by polishing and clean up but more speciic to the valve and valve area. Porting or open up the combustion chamber is next for increases followed by exhaust runner porting.

  12. #12
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    1997 740i, 1973 Bronco, 1996 Bronco


    Very nice... Subscibing..

    oh, are you doing anything to bottom end? Crank, pistons, etc?
    UUC EVO3 SSK, 6spd, Quaife dif. 3.15, VF Super Charger with race bypass valve, Zionsville super duty kit with 2 stage fan, M5 mirrors, SS brake lines, clears, BSW stage 1 and d112.e38 Subwoofer System, Angel eyes and HID lights, Strong Strut, Sarona full Body Kit, 750 brake swap, working on black interior swap and KW coil-over install, etc...

  13. #13
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    01 740I Sport
    Very Nice

  14. #14
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    Bavarian Muscle Car
    I have a Dinan 5 (S/C 540i)I have never heard of a S4 or s5,seeing that the $70k Dinan S3 is their top S/C perfromance kit.
    Vortech V2Ti Rebello Racing M62 4.9L E34. Not a race car, but a fun car.

    [IMG][/IMG]

  15. #15
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    Quote Originally Posted by BlackWolf View Post


    Very nice... Subscibing..

    oh, are you doing anything to bottom end? Crank, pistons, etc?
    Hey BW nice to hear from ya - i just goin freshen up the bottom end - rings and bearings for now, i havent research bottom end builds on these motors, however time permitting i might do it complete.

    Maybe i'm wrong but my understanding from my dinan guy is that S3 for the 7 series includes everything for S/C, intake,programming Yadda yadda up to exhaust & suspension, the S4 pkg is the S/C performance stuff + brakes & S5 is everything up to S4 + LSD rear end. Either way a chitful of cash.

  16. #16
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    Quote Originally Posted by BMW5868 View Post
    Hey BW nice to hear from ya - i just goin freshen up the bottom end - rings and bearings for now, i havent research bottom end builds on these motors, however time permitting i might do it complete..

    M5 forged crank, Forged Arrow Rods, FI style pistons, maybe Weisco..

    Are you iron sleaving the cylinder walls as well, bore?

    Looks like a lot of fun!!
    UUC EVO3 SSK, 6spd, Quaife dif. 3.15, VF Super Charger with race bypass valve, Zionsville super duty kit with 2 stage fan, M5 mirrors, SS brake lines, clears, BSW stage 1 and d112.e38 Subwoofer System, Angel eyes and HID lights, Strong Strut, Sarona full Body Kit, 750 brake swap, working on black interior swap and KW coil-over install, etc...

  17. #17
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    1999 740i Sport (Custom)

    Can't wait for the dinan supercharger implant...

    I decided to do my stereo and custom interior work before I tackled the motor. I'm ready for going over 400 hp... I have the dinan stage 1 computer software and I run neck and neck with the last generation mustang cobra. Can't wait to see what the supercharger can do.

    Work in progress...

  18. #18
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    Headers finished
    Attached Images Attached Images

  19. #19
    plik's Avatar
    plik is offline Voted "Nicest Guy" - 2007
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    Quote Originally Posted by BMW5868 View Post
    Headers finished
    Let me first say, I think you're insane, and ...



    Excellent job on those headers!

  20. #20
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    Been stalled with getting the proper valves, so after several back and forths, i was advised not to use BMW valves with the 3 slot keepers as they would not be reliable with the spring pressure and upgraded boost. So we redisigned a valve using a nisson race valve that we got to work that has a 1 slot keeper and from this we will be custom making new valves. 2 weeks in the process.

  21. #21
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    e39 M5, e23 745, 633
    I'm so excited for the final result...
    e23 745i 5-speed, needs moar boost!
    82 633 CSi...in hibernation
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  22. #22
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    Shitbox Suzi
    the headers are just sexy, big thumbs up
    Fast, Cheap, Reliable - Pick any two, and the third is laughable

  23. #23
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    Well everything seem to be falling into place after 1 month wait of valves and valve train selection, so as the heads get finished i have started to dry fit the various parts and routings of wiring, new water injection pump and larger reservoir. Ceramic coated the exhaust. After all the back and forth we are going with the 3 keeper BMW style valves, they are finished and just waiting on valve springs and retainers. Larger crank pully 6" (+1" & 6 rib) and 3.25 Pump pully (down from 3.33) so it will be up from 34,000 rpm stock to 43,000 rpm.
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    Last edited by BMW5868; 06-12-2008 at 08:00 PM.

  24. #24
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    this build is sick
    Reigning and Longest Tenured OT President to Date

  25. #25
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    00 540iTs Glacier, 06 RR
    Are sticking with the standard tune that came with your SC kit? If not, what are doing about tuning?

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