XHP Trans Flash -- whats the consensus? POLL

Enabled · 06-22-2019, 11:27 PM

It is a hardware limitation inside the transmission having to do with the active clutch packs on 3rd and 6th gears.
Because of the switch between the different planetary gear packs, 3rd/6th have to use a much weaker set of clutches active. Factory acknowledged this and set the limits at 380Nm for 3rd and 6th, while the rest were set at 450Nm, for the 8HP45.

Sure you can tune those limits out, and for the time being it will hold, but it will reduce the life of those specific clutch packs.

SoCalCarGuy · 07-10-2020, 12:31 AM

Quote:

Originally Posted by Enabled

It is a hardware limitation inside the transmission having to do with the active clutch packs on 3rd and 6th gears.
Because of the switch between the different planetary gear packs, 3rd/6th have to use a much weaker set of clutches active. Factory acknowledged this and set the limits at 380Nm for 3rd and 6th, while the rest were set at 450Nm, for the 8HP45.

Sure you can tune those limits out, and for the time being it will hold, but it will reduce the life of those specific clutch packs.

I finally flashed the trans. I 100% recommend.

My first 0-60 run shaved .28 second off my previous best. [IMG][/IMG]

328iX · 07-10-2020, 03:20 PM

I'm gonna have to say don't want it. the trans shifts very firm in manual mode. I'm guessing because it cannot anticipate when you will shift? Or just to feel sportier?

tardboi · 07-10-2020, 07:25 PM

Quote:

Originally Posted by 328iX

I'm gonna have to say don't want it. the trans shifts very firm in manual mode. I'm guessing because it cannot anticipate when you will shift? Or just to feel sportier?

Why wouldnt you want firm shifts in manual mode? Doesnt a soft shift necessitate a slower shift?

tardboi · 09-14-2020, 08:04 PM

Quote:

Originally Posted by demc1982

sorry i misquoted.

Are you talking about the 6 or 8 speed zf?

3rd and 6th are limited on the 8 speed

https://f30.bimmerpost.com/forums/sh....php?t=1486930

View Poll Results: Is the XHP tune worth the price of admission?
I have it, yes it is	16	40.00%
I have it, no it isn't	1	2.50%
I don't have it, but I want it	9	22.50%
I don't want it	14	35.00%
Voters: 40. You may not vote on this poll

06-22-2019, 11:27 PM	#23
Enabled Lieutenant Colonel 1406 Rep 1,797 Posts Drives: 328xd Wagon, M2 Competition Join Date: Jun 2018 Location: Houston iTrader: (0)	It is a hardware limitation inside the transmission having to do with the active clutch packs on 3rd and 6th gears. Because of the switch between the different planetary gear packs, 3rd/6th have to use a much weaker set of clutches active. Factory acknowledged this and set the limits at 380Nm for 3rd and 6th, while the rest were set at 450Nm, for the 8HP45. Sure you can tune those limits out, and for the time being it will hold, but it will reduce the life of those specific clutch packs. __________________ -2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs. -2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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07-10-2020, 03:20 PM	#25
328iX David 786 Rep 2,010 Posts Drives: 2015 328iX F31 Join Date: Nov 2018 Location: Temecula, CA iTrader: (0)	I'm gonna have to say don't want it. the trans shifts very firm in manual mode. I'm guessing because it cannot anticipate when you will shift? Or just to feel sportier?
	Appreciate 0 Quote