Results 1 to 17 of 17

Thread: 95 m3 full bolt ons dyno question

  1. #1
    Join Date
    Feb 2013
    Location
    Denver, CO
    Posts
    145
    My Cars
    95 Daytona Violet m3

    95 m3 full bolt ons dyno question

    So my car has a Riot racing BBTB, RR cams, injectors, shorty headers, CAI with the 3.5inch upgrade, and a chip. I recently got it dynoed and on the last run it got to 235rwhp. My question though is it has this weird dip at around 5k rpm, anyone have any idea as to what that could be? Friend thinks it could be coils since my motor has about 199k miles or the dyno wasnt reading right since we couldnt get a solid torque reading.
    Attached Images Attached Images
    2002 E46 m3 Topaz Blue

  2. #2
    Join Date
    Jun 2012
    Location
    PR
    Posts
    413
    My Cars
    '93 e36 race car
    Quote Originally Posted by Mastershake01 View Post
    So my car has a Riot racing BBTB, RR cams, injectors, shorty headers, CAI with the 3.5inch upgrade, and a chip. I recently got it dynoed and on the last run it got to 235rwhp. My question though is it has this weird dip at around 5k rpm, anyone have any idea as to what that could be? Friend thinks it could be coils since my motor has about 199k miles or the dyno wasnt reading right since we couldnt get a solid torque reading.
    Vanos activation?


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    It’s too bad the dyno operator did not know how to hook up the tach to give the power curve in rpm and thus also a torque curve. Dyno seems slightly low but is is a 23 year old motor.

  4. #4
    Join Date
    Feb 2013
    Location
    Denver, CO
    Posts
    145
    My Cars
    95 Daytona Violet m3
    Quote Originally Posted by pbonsalb View Post
    It’s too bad the dyno operator did not know how to hook up the tach to give the power curve in rpm and thus also a torque curve. Dyno seems slightly low but is is a 23 year old motor.
    thats what I was thinking, Ive been thinking about taking it to another shop to have it ran again because this is the fastest e36 m3 ive ever driven, feels alot stronger than my 97 I use to have but I dont know.
    2002 E46 m3 Topaz Blue

  5. #5
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    With rpm you would be able to compare better. Vanos does change from advance to retard around 5000 rpm for top end power and a little blip there is not uncommon. If vanos was not working there would be no low to midrange advance and the power curve would feel flat and then take off up top.

    Many 20+ year old cars need some work so it’s possible your car needs some sorting. Cam sensor and knock sensor harnesses can deteriorate with age and a lot of other little things can go wrong.

  6. #6
    Join Date
    Mar 2012
    Location
    Renton, Wa
    Posts
    5,429
    My Cars
    98 m3
    That dip at 95mph isn’t 5k.

    Your tune doesn’t have vanos setup properly.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  7. #7
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    A 95 M3 has 3.15 diff and 235/40/17 tires and does 93 mph at 5000 rpm in 4th, but maybe the car does not have stock size tires or diff ratio.

  8. #8
    Join Date
    Jan 2004
    Location
    NY
    Posts
    22,823
    My Cars
    skateboard
    Looks like you need an RK tunes tune.


    Sent from my iPhone using Tapatalk
    “If liberty means anything at all, it means the right to tell people what they do not want to hear.”
    ― George Orwell

  9. #9
    Join Date
    Mar 2012
    Location
    Renton, Wa
    Posts
    5,429
    My Cars
    98 m3
    Quote Originally Posted by pbonsalb View Post
    It’s too bad the dyno operator did not know how to hook up the tach to give the power curve in rpm and thus also a torque curve. Dyno seems slightly low but is is a 23 year old motor.
    Just looking at the graph im going to say its what happens when vanos switch point is wrong. Usually happens at 4.5k. Maybe the tune bumped the switch up a bit but not enough and thats why its closer to 5k.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  10. #10
    Join Date
    Apr 2008
    Location
    Riverside, CA
    Posts
    345
    My Cars
    98' M3/4/5, 85' 944
    op like teh screen name

  11. #11
    Join Date
    Apr 2016
    Location
    Irvine, CA
    Posts
    664
    My Cars
    99 328is, 03 X5
    Quote Originally Posted by pbonsalb View Post
    Dyno seems slightly low but is is a 23 year old motor.
    I suspect elevation playing a huge hand in that.

  12. #12
    Join Date
    Mar 2012
    Location
    Renton, Wa
    Posts
    5,429
    My Cars
    98 m3
    Quote Originally Posted by Team Neverlift View Post
    I suspect elevation playing a huge hand in that.
    Its sae, so nope.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  13. #13
    Join Date
    Feb 2013
    Location
    Denver, CO
    Posts
    145
    My Cars
    95 Daytona Violet m3
    Quote Originally Posted by tvcasualty View Post
    op like teh screen name
    Thanks. Im possibly thinking the tune since Im sure the RR Cams run more aggressive than the most of the other off the shelf cams and there is no dedicated tune for them. Does anyone know a good BMW OBD1 tuner in Denver or the surrounding area? Thanks everyone for the replies.
    2002 E46 m3 Topaz Blue

  14. #14
    Join Date
    Jun 2011
    Location
    Vancouver, BC Ca
    Posts
    3,255
    My Cars
    1993 325is
    Remote tune from Vollosso!!! He did my built OBD1 3.0 to the tune of 270whp and 240 ft/lbs.

  15. #15
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    Probably a Schrick 264/256 tune would work for the RR regrinds. Remote tuning is fine as long as the tuner is responsive and willing to work with you on revisions if you need one. Most 20+ year old cars need some maintenance. Owners often mod them without sorting them out first. Sometimes the mods are not installed right. Then the tuner gets blamed for everything and has to spend hours trying to help the owner figure out and fix the non tuning problems with the car. Can the OP help by data logging or at least getting proper dyno run with rpm hook up and run files?

  16. #16
    Join Date
    Feb 2013
    Location
    Denver, CO
    Posts
    145
    My Cars
    95 Daytona Violet m3
    I have an appointment set up at a reputable tuner here that is going to custom tune a Miller War Chip, I will update in a few weeks when that is done.

  17. #17
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    Hopefully the shop is familiar with the Miller system. If not, you can pay for its education. Let us know the results.

Similar Threads

  1. 95 m3 control arms on 328 questions
    By dwvcfii in forum General BMW Mechanical Help sponsored by RM European Auto Parts
    Replies: 0
    Last Post: 04-19-2011, 09:35 PM
  2. 98 E36 M3 Full Bolt on + Cams VS. Evo 7 or 8
    By omak81 in forum Kill Stories
    Replies: 18
    Last Post: 10-09-2010, 05:37 AM
  3. '95 M3 vs. full bolt on Mk4 GTI
    By malter in forum Kill Stories
    Replies: 16
    Last Post: 07-26-2006, 12:46 PM
  4. FS:1997 M3 Sedan(full bolt on)
    By mr_green in forum BMW Cars For Sale / Wanted
    Replies: 3
    Last Post: 10-13-2004, 06:50 PM
  5. Are SS resonators for US 95 M3 direct bolt on?
    By vehdyn in forum 1992 - 1999 M3 (E36)
    Replies: 3
    Last Post: 12-11-2002, 08:30 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •