I use RP Synchromax too
Redline MTL
Redline MT90
MTL/MT90 concoction
Redline D4 ATF
Other, specify
Member
Difficult 4>5 Upshift when Tranny Hot on Track. Fluid choices?
Two years ago my transmission exhibited a difficult 4>5 upshift on track after everything in the trans was very hot. It seemed to go away last year. However it returned at NJMP this Thursday/Friday. Oddly, all downshifts are just fine.
Clutch is original at 124k, clutch is fully bled properly, new clutch MC a few years ago.
This doesn't seem to be a problem when the transmission isn't super hot (at least I don't think so, I don't shift at 7k on the street from 4>5!)
I currently run Royal Purple Synchromax in the trans.
Any other suggestions on fluid that may fair better at high temps?
[2004 330xi/6] Orient/Natural :: 117-142k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 113-125k :: TCKline D/A (500/600) :: GC Plates :: RD Sways :: GC Rear Arms :: ZHP Rack :: 3.64 Diffsonline :: PF FCAB :: BW RTAB :: AKG Subframe :: TMS Pulleys :: AA & Borla :: XBrace :: TRM C2s :: BW lines :: DTC60 :: Safety Equipment
Past:
[1995 M3] Avus/Dove :: 141-242k :: S52 OBDI :: M50 manifold :: 3.5 HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport :: Z3 rack
[1999 M3] Cosmos/Black :: 65-87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Safety Equipment
[1993 325is] Brilliant/Black :: 135-139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 219-242k :: homebrew CAI :: some rust :: multicolor body panels
Ambitious But Rubbish
Mine did that a few years ago, went back to normal as soon as the fluid cooled back down. It only happened a couple of times, when at summer events with super hot weather and (I think) on old trans fluid. I run Redline D4 ATF and it hasn't come back. I change the fluid once a year.
2011 F-150 FX4 | 1997 BMW M3 #404 GTS2 | 2006 BMW M3 Convertible
Out Motorsports
Member
I also run redline d4 and change it before each season. No problems
БМВ Фанат!
It most likely not the fluid related, but detent pins instead. It could be that running different fluid is only masking the original problem.
- 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)
Member
Could be. Does have the lean of doom for a bit if I shift to 5th before it is warm.Originally Posted by bimerok
[2004 330xi/6] Orient/Natural :: 117-142k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 113-125k :: TCKline D/A (500/600) :: GC Plates :: RD Sways :: GC Rear Arms :: ZHP Rack :: 3.64 Diffsonline :: PF FCAB :: BW RTAB :: AKG Subframe :: TMS Pulleys :: AA & Borla :: XBrace :: TRM C2s :: BW lines :: DTC60 :: Safety Equipment
Past:
[1995 M3] Avus/Dove :: 141-242k :: S52 OBDI :: M50 manifold :: 3.5 HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport :: Z3 rack
[1999 M3] Cosmos/Black :: 65-87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Safety Equipment
[1993 325is] Brilliant/Black :: 135-139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 219-242k :: homebrew CAI :: some rust :: multicolor body panels
Member
I had the same problem with 4-3 downshifts when I ran RP Synchromax . . . it just got too thin at high temperatures. Switched to AMSOIL synthetic manual synchromesh fluid and everything is much smoother now.
2001 Steel Gray MCoupe - 147,000 miles and owned since new. MCS 2WNR suspension, Hotchkiss swaybar, poly bushings all around, cat delete headers with custom tune, 3.73 LSD, and Clownshoe Motorsports rear subframe reinforcement.
2014 Porsche Cayman S / 2022 BMW X3M Competition / 2020 Ram Rebel
Member
I found an old thread where James Clay recommended D4 ATF, and the Autotechnic guys also run it in their race cars. Gonna give it a go.
Also bought a new clutch pedal (I was doing some under-dash investigation and found the holes had some ovality and slop to em) and flex line to the slave. See if that coupled with new fluid has any effect.
[2004 330xi/6] Orient/Natural :: 117-142k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 113-125k :: TCKline D/A (500/600) :: GC Plates :: RD Sways :: GC Rear Arms :: ZHP Rack :: 3.64 Diffsonline :: PF FCAB :: BW RTAB :: AKG Subframe :: TMS Pulleys :: AA & Borla :: XBrace :: TRM C2s :: BW lines :: DTC60 :: Safety Equipment
Past:
[1995 M3] Avus/Dove :: 141-242k :: S52 OBDI :: M50 manifold :: 3.5 HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport :: Z3 rack
[1999 M3] Cosmos/Black :: 65-87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Safety Equipment
[1993 325is] Brilliant/Black :: 135-139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 219-242k :: homebrew CAI :: some rust :: multicolor body panels
Member
I tried running the uuc mix to quiet down the flywheel noise. I would have to shift so slow when cold to avoid grinding. Then when it got real hot it would start to grind again if I shifted to quick. (On track)
Went back to straight d4 and it shifts perfect cold or hot again.
Member
D4 ATF. It's what the manual says.
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