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Thread: 1997 M3 4 Door with LS/T56

  1. #301
    Join Date
    Mar 2004
    Location
    USA
    Posts
    3,161
    My Cars
    96 328is 6.0L
    Quote Originally Posted by Tim Mc View Post
    Overall a bit disappointed it wasn't more of a weight loss.
    Lol don't be. You now have almost mid-engine car where the engine is just slightly over the front axel. A lot lower center of gravity becaus LS is way lower and lighter then BMW engine. A lot less weight at the front of the car and lots of the weight also shifted down and towards the mid section with the weight of T56 being way havier than getrag.
    - 96 328is 6.0L. (LS1 to LS2 build thread: http://forums.bimmerforums.com/forum...ad.php?2098938)
    - 96 328is 5.7L. (LS1 build thread: http://forums.bimmerforums.com/forum....php?t=1289987)
    - 95 ///M3 6.0L. (LS2 build thread: http://forums.bimmerforums.com/forum....php?t=1619249)

    - 97 ///M3. (e46 Fender Flares/track car build thread: http://forums.bimmerforums.com/forum....php?t=1727098)
    - 96 328is (Dual Fuel Pump to Surge Tank thread: http://www.bimmerforums.com/forum/sh...ad.php?1964025)

  2. #302
    Join Date
    Oct 2011
    Location
    Canterbury, CT
    Posts
    68
    My Cars
    1995 BMW 325i
    Car looks great! Keeping me motivated for sure!


    Sent from my iPhone using Tapatalk

  3. #303
    Join Date
    Apr 2012
    Location
    Florida
    Posts
    333
    My Cars
    2008 M5
    bimerok: Agreed...always nice for a weight loss too. Once could go with a CF driveshaft as well. We chose our exhaust on cost and weight - maybe we could lose the mid-muffler. No worries...certainly glad we didn't gain in the switch!

    eturdysix: Wish you best of luck! Even with temps/humidity in the 90's, I'm finding excuses to run to Autozone to dump a gallon of oil or swing by Sams Club for the spouse. (!) The pedal arrangement and LS7 clutch is wonderful for heel toe...close ratio makes it zippy. We are still keeping it under 5000 rpm.

    Car show in the AM and mountain bike transport in the PM...we hadn't been on the trails since taking the car down for the switch. Nice change of pace and the L33 just cruised.



    One concern is the fuel pressure. We started out with a GM fuel regulator/filter and showed pressure of 78 psi. We switched to a Wix and was at 65 psi. Now after a few miles we are seeing 38 to 45 psi...on our analog gauge mounted on the fuel rail. Rather inconsistent. I may have another to check reliability...may just pony up another 100 bucks for Holley transducer and plug it into the EFI for logging. One hundred dollar bills just disappear on these projects...:-)

  4. #304
    Join Date
    Dec 2014
    Location
    Des Moines, IA
    Posts
    709
    My Cars
    '97 M3/4/5.0
    Quote Originally Posted by Tim Mc View Post
    3206 pounds (no fuel / no people / no junk)

    Original weigh in was 3237 in the same configuration.
    Yeah!!

  5. #305
    Join Date
    Mar 2018
    Location
    Arizona
    Posts
    167
    My Cars
    1998 328I
    Sounds like weight is right around the same as mine, mine was 3300 with me in it. I was thinking yours was going to be a bit heavier since you have that heating insulation.

  6. #306
    Join Date
    Apr 2012
    Location
    Florida
    Posts
    333
    My Cars
    2008 M5
    Ruly: The heat insulation is pretty insignificant, but likely adds 5 pounds or so. It is not the sound absorption butyl rubber, but just layered plastic layers with in some cases a thick foil reflective part. No issues with heat...although it is just plain hot here with humidity...

    Did drive it to work (62 mile round trip)...didn't miss a beat. Great fun...2300 rpm at 85 mph (indicated)...instant power with the mild cammed, 5.3. Love the shifter/pedal relationship. Instantly at home with the heel/toe maneuvering...

    Idle is dead smooth at 700 rpm...not used to that. Likely we under-cammed with the 3.91 gears...still very snappy and still spins up nicely (touched 5500 rpm today). Gas mileage is less than the S52...

  7. #307
    Join Date
    May 2014
    Location
    Noblesville, IN
    Posts
    1,721
    My Cars
    98 328i, 79 911SC
    Quote Originally Posted by Tim Mc View Post
    Idle is dead smooth at 700 rpm...not used to that. Likely we under-cammed with the 3.91 gears...still very snappy and still spins up nicely (touched 5500 rpm today). Gas mileage is less than the S52...
    i was never able to get great fuel economy, even cruising in 6th at 75 i couldn't touch my s52.
    but when i stomped the throttle, i never once gave a hoot about economy. so much more thrust than the s52 and pulled hard from 2000 through redline. (pretty sure i had more cam you have now though.)
    if you want some fuel economy back, maybe step your rear down to a 3.73 or 3.64. i ran too much cam for gears that low. wouldn't cruise nicely below 2k rpm.
    always trying to make it lighter and faster

    build: http://www.bimmerforums.com/forum/sh...-neglected-M3/
    other build: http://forums.pelicanparts.com/porsc...car-build.html
    instant grams: doktor_b

  8. #308
    Join Date
    Apr 2012
    Location
    Florida
    Posts
    333
    My Cars
    2008 M5
    doktor b: agreed. Of course our S52 had 230,000 miles...and an auto. Last tank fulls returned 19 and 20 mpg so far...mostly light footed and the commute.

    First challenge: no start at the gas station. Received a jump start and made it home to check the voltage...10 volts running. I didn't think my bought used (but new) AC Delco alternator would be the first to go. Easy to source another Camaro unit though...

    The cooler weather tonight made cruising great fun! Near 300 miles on it thus far.
    Last edited by Tim Mc; 09-21-2018 at 09:59 PM.

  9. #309
    Join Date
    Mar 2018
    Location
    Arizona
    Posts
    167
    My Cars
    1998 328I
    Could the alternator dealio be a ground issue?

    I ended up with two alternators on my build lol, I purchased a camaro unit the ac delco one, but somewhere in my bimmerforums/ls1tech wormholes of looking up everything and anything i ran across a bunch of threads that said upgrading to the truck alternator is better. So far so good, although i'm sure if your amp is bad it was just an unlucky bad one

    in case you need it though, here is the one i purchased, more amps and it's cheaper.. fit without mods too https://www.ebay.com/itm/New-Alterna...1Z42R8&vxp=mtr

  10. #310
    Join Date
    Feb 2011
    Location
    Houston, TX
    Posts
    133
    My Cars
    1997 M3 Sedan
    I chased/am chasing a charging issue too. I think itís because of poor voltage regulation when the field control wire is hooked up to the charge light in the dash. I think itís better off connected to the PCM output for this function.

    In my case now, the LS3 PCM has PWM field control so it canít control the LS1 alternator and the LS3 alternator doesnít fit in the LS1 FEAD so I had the LS1 alternator converted to self-regulation. Iíll hopefully find out real soon how that works.

    It may be a better option than trying to use the charge light for the field control signal if not using a GM PCM.


    Sent from my iPhone using Tapatalk Pro

  11. #311
    Join Date
    Apr 2012
    Location
    Florida
    Posts
    333
    My Cars
    2008 M5
    RulyLSX: Your suggestion of the truck model came a bit too late. Amazon next day was in process. Will give that a try if this one fails...yours was a better price!

    BigL350: Good luck on that combination. We've skipped the dash light and used a resister with a LS1 replacement. No ECU connection...not sure if that is better or worse. Either way, fired it up at 2100 tonight and 14.3 volts.

    Amazon delivery...got to work...pretty easy deal. I made it tough on myself...but that happens when I'm in a hurry. See if the Chinese replacement AC Delco outlasts the Mexican AC Delco model. Is anything made in America anymore???



    Also got to some house cleaning...remnants heading to the round file...:



    This is the culprit that cost us 2 weeks...GM tape should be at the front on the driverside and rear of the passenger side...likely common knowledge for experienced LS folks:



    Cleaned up the wiring today as well as switched to antifreeze...figured we would wait to switch from distilled water, but we had no leaks so...
    Last edited by Tim Mc; 09-22-2018 at 09:45 PM.

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