(Q to) Hello fellow 5EAT enthusiasts, Re: Requested Torque maps tuning for larger turbos on 5EAT.
I got a Borg Warner EFR 7163 - a 62lb/min turbo on my 06" OBXT.
My 5EAT transmission is custom made by HexMods to handle all this tq & hp
(I estimate over 500hp at the crank on e85.)
On e85 the transmission is performing like a champ (kudos HexMods!), not slipping,
no rough shifts, just bang, bang, Bang and I am well over 60mph in under 4 sec.
Many surprised M calls BMWs and big dumb V8 cars...
But, while all is fine on e85, on Cal 91 I keep getting TCU error codes which causes the
tranny to go into "safe" mode preventing TC lockup - heating as a results.
It consistently happens under low/middle throttle, typically when I am in cruse control @~70mph - when load is slightly increasing (like when the HW begins to climb slightly up a very small incline.).
It does NOT happen when under WOT or other high throttle applications.
Takes couple of days to erase/disappear making it difficult to plan long trips away
from e85.
Presently my "Requested Torque values" maps are OEM - which seems to work when using e85 (turbo spools up faster, more torque,) but generates TCU errors when, I suspect, the " Requested Torque value" cannot be reached when I run on Cal 91 octane - slower spool, shallower torque curve.
Can ppl offer an alternative interpretation or, confirm this line of reasoning...?
I am thinking of generating tuning maps(s) with altered Requested Torque values
to try to make the computers think that all is fine by, for example, requesting Less torque when running on 91.
Thanks in advance for any comments, suggestions, shared experiences will be much appreciated.