KGB

I think my problem is different; it feels like my TCC unlocked prematurely under partial load - probably some inconsistency between the requested torque and actual torque... It happens mostly while I cruise on the HW on cruise control at ~70-75mph... i'll be troubleshooting it with the port reader/logger... When I reset the TCU, the problem goes away, until next time... Again, no issues sifting under full throttle (~450+lbtq!)

Hi toojayzee, would you mind sharing what were the symptoms and codes related to your TCC, and how did you got about troubleshooting it and tracing it down a "bad" solenoid? I am having a similar problem on my built 5EAT, with V1 VB - it happens at partial/low throttle when the load is changing slightly up. Dont think its a solenoid, but will be happy to listen & learn from your experience. Thanks in advance -I ps: my car, in its previous incarnation, run a ~500hp EFR 7163 turbo, no problems at full throttle - kudos to ClimberD@HexMods! Just that pesky low thourtle issue that keep coming back throwing up P0741 code... Then I a blew my built motor - currently it's been rebuilt to handle 850hp and is awaiting integration with a 7163 twin scroll - expecting over 600chp.

WRXUSA, guys, porting VF turbo does very little if anything - waste of money, really - no dyno data to support it, anywhere. If anything, you want a A/R restrictor to spool-up faster, but then you'll pay a penalty on the top end, so there is no point really. Since there is no way to change the actual A/R ratio up by porting just the entrance port its pointless. Excessive porting will cause turbulence down the snail and actually hurt you. Mike@GST does a wonderful job tuning VF52 on e85 - this cures 85% of the lag. for what its worth I am speaking from experience.

How much torque do you expect from this turbo? With a HexMods VB you should be okay to 400wtq, maybe more... Do it Before the turbo or bravely risk watching the Tranny grenade on the dyno

How does one install such a switch to control the TC lockup? I may need to do it in my setup, for long HW trips where my TC seems to be unhappy not being able to hold lock/unlock Thanks

I reached out to Kevin in the past to compare notes, Hopefully he'll reply. Note that his turbo spools up in the mid 4.5K which puts less stress in the tranny The EFR 7163 single scroll spools about 500rpm sooner, and a twin scroll version should spool up in the mid 3.5K on my 83mm crank 2.6L strocker - that should put the tranny to a real test - several people have grenaded their 5EATs imidietly after installing a twin scroll turbo - high load kills

HexMods stuffed as many clutch packs as our case can fit, all were toleranced much better than IPT Also, forgot to mention that my Center Diff has been cryo treated then REM polished. If I were doing it all over gain I would also WPC treat all the gears and CD.

For maximizing 5EAT torque handling and lifetime when modding your car I have a one of a kind bullet proof tranny made for me by HexMods, F1 VB and IPT higher stall TC, I also run midsize tranny cooler and I monitor temp in & out of the transmission - sometime it spikes which is a good feedback to back off and learn good habits. If ppl are interested, we should put together a group buy of 3-5 transmissions - this may convince D@HexMods to do replicate my tranny, which is awesome. It survived a 550chp EFR 7163 build and will be soon tested up to ~650chp when I upgrade to a new built strocker motor and a twin scroll EFR 7163 turbo

Hi Scooby2.5, I am finalizing my motor build and trying to choose between JE and Manley pistons - lower noise is a good idea as it pertains to longer oil rings lifetime... I am very impressed that your motor lasted 100K - congrats! I take it you were diligent in warming up the car before pushing it, and running good oil - what oil where you running? Is there any difference in P-W clearance between your new Manley pistons and the older JE pistons you were running? Were both pistons had coatings on their skirts? (and how did the JE skirts looked like after 100k?) Manley states that their pistons' pins are slightly offset. JE does not state that in their catalog but I called then and they too say that their pistons got offset wrist pins... Perhaps the older JE pistons you got did not (yet) have implemented offset wrist pins? Thanks in advance for sharing!

rich_lgt, at 340whp you are at/over the limit and your 5EAT is living on borrowed time... HexMods can't help you, yet (but I now he is working on it...) Your other option might be to try IPT but make SURE that they have a VB kit for your year! If not, don't bother. Level10 - has mixed reviewed, at best... good luck

frank_steer; I am not familiar with Holset, what is it? The diff between 91 and e85 are mostly in timing and fuel maps. indeed it probably has something to do with the load calculations - I'll be working with Paul at Yimi sport in LA this Friday to try to generate some alternative maps for 91. We can either Increase "requested torque" or decrease it, and its rate of change - what would you recommend? West_minist - looking forward to hearing your feedback on the 7670 - its a big turbo and can do damage to the tranny if not properly strengthened. F1 and Diff bushings will help but I think you'll eventually want more clutch plates (this is what I got.) either way, I would suggest monitoring the temp In AND Out of the tranny - you'll want to know if its getting hot and when... Cheers!

(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.

Hurry up! My '06 5EAT puts out periodic 0700 codes now that I am running a BW EFR 6258 turbo on E85... Thinking of upgrading to a 60lb/min EFR 7163 soon, will need to upgrade the tranny then or soon after... Thanks!