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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications 8HP70 or 75 trans swap into G30 540ix

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      09-22-2020, 02:15 PM   #1
luke1990
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8HP70 or 75 trans swap into G30 540ix

Hi all,

So I have a very peculiar problem . I run a high power G30 540ix. Couple people that already run that kind of power (maybe a bit more ) ran into issues already with slipping gears in the 8HP50.

One of the people I know swapped 8HP70 into his F car. I was thinking about doing the same as 8HP70 car likely hold 1000nm (rated at 700 I know ).

1. Would it work if I found 8HP75 from g30 m550i / f90 m5, swapped it and used somehow their coding file?
2. Or is it better to go with 8HP70 from say 335d and try to get custom map? I know one guy here used the B4S Alpina flash I think for that.

If so do you know anybody who does custom trans flashes to help with this? I know xHP did something, but its not their business and also Sutphin

What do you guys think is the best? I know the mechanical issues too . Level10 builds transmissions, but I've read some not so great reviews for that.
Thanks y'all
Btw also posted in coding to see maybe if there somebody know
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      09-22-2020, 04:38 PM   #2
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Sorry.. no answers - just questions. Are you're having issues already or you just trying to avoid them? What kind of power & tune are you running? Also, did you get the torque converter upgrade from the MPPSK? I'd be curious about the diagnosis for the cause in the slip, because if it's not band related then it could be part of the converter. The MPPSK upgrade pushes the 540i to 500Nm, so there's got to be a reasonable margin to allow for that and probably the main reason why the converter gets swapped out.
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      09-23-2020, 05:44 AM   #3
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Quote:
Originally Posted by DBO View Post
Sorry.. no answers - just questions. Are you're having issues already or you just trying to avoid them? What kind of power & tune are you running? Also, did you get the torque converter upgrade from the MPPSK? I'd be curious about the diagnosis for the cause in the slip, because if it's not band related then it could be part of the converter. The MPPSK upgrade pushes the 540i to 500Nm, so there's got to be a reasonable margin to allow for that and probably the main reason why the converter gets swapped out.
I'm trying to avoid them for future. As far as how much torque the box can take, for sure there is reasonable margin. xHP says 800-900nm are fine, Mission Performance says anything over 600Nm even with raised line pressures you're wearing your clutches faster. It depends on A: what kind of view do you have - what does reliability mean to you and B: how much power you're running.

My friend runs anything in between 800-1000nm through the box and after half a year he has slip in 4th, 5th and big slippage in 6th which result in load drop. So yeah . And he runs same turbo as me (albeit a bit more aggresive tune) and is a ligther car (so easier on trans).

As such, I can either run "low torque" tunes and hope for the best with xHP map that comes hopefully towards end of the year, or build the transmission with Level10, or swap - but for that I need a map .
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      09-23-2020, 05:52 AM   #4
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Quote:
Originally Posted by DBO View Post
Sorry.. no answers - just questions. Are you're having issues already or you just trying to avoid them? What kind of power & tune are you running? Also, did you get the torque converter upgrade from the MPPSK? I'd be curious about the diagnosis for the cause in the slip, because if it's not band related then it could be part of the converter. The MPPSK upgrade pushes the 540i to 500Nm, so there's got to be a reasonable margin to allow for that and probably the main reason why the converter gets swapped out.
As for my power - car ran >710wnm on my more aggressive map on dynojet so yeah thats anywhere between 800-850nm. And as I said the turbo can push more of course.

I'm gonna try to see if I can get the torque converter upgrade separate from the exhaust. I read a bit on it, but there is nothing conclusive on what it actually does. Do you know? I know its a part from F3x series and comes as part of the MPPSK. Need to find the part number . And btw - the friend who got a slip is running M140i RWD - not sure if that already has the converter upgrade?
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      09-23-2020, 04:46 PM   #5
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The part numbers are as follows. Initially I thought they may use the converter from the 550, but that's not the case. From what I've been able to tell, it's the same converter they use on the M340i (which also runs the GA8HP50)

24008632217 - MPPSK
24008632218 - stock (540i)

Yes.. to your other question. M140i comes up with same part number, so the upgrade is already fitted to that GA8HP50 as well.
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Last edited by DBO; 09-23-2020 at 04:55 PM..
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      09-23-2020, 07:25 PM   #6
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All of the newer BMW transmissions have EWS security. So it's matched to the FEM / BCD and DME.

It's not simple swapping trans over unless someone or some service has a way to virginize them.

There are tools available to virginize the F series 8HP and 6HP trans but still nothing (publicly known) for the DCT. I don't know of any tools that can virginize the newer transmissions yet.
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      09-23-2020, 08:33 PM   #7
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Find it weird that people try to make huge power numbers out the 540... it's a luxury sedan weighing 3800+ lbs. jus my 2 cents
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      09-23-2020, 11:19 PM   #8
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Quote:
Originally Posted by Alpine540iM View Post
Find it weird that people try to make huge power numbers out the 540... it's a luxury sedan weighing 3800+ lbs. jus my 2 cents
It's equally weird that people come to a modification forum and question why others like modifying cars or making them quicker.
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      09-24-2020, 02:51 AM   #9
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Quote:
Originally Posted by xxxjecxxx2 View Post
All of the newer BMW transmissions have EWS security. So it's matched to the FEM / BCD and DME.

It's not simple swapping trans over unless someone or some service has a way to virginize them.

There are tools available to virginize the F series 8HP and 6HP trans but still nothing (publicly known) for the DCT. I don't know of any tools that can virginize the newer transmissions yet.
Thanks this makes it more clear! So the process would be:
1. Get the trans
2. Install it (I know there is more to this)
3. Virginize it - meaning removing the FEM / BCD and DME match; when such tool is available
4. Flash appropriate new file -> when OBD flashing is available

On the last point do you know if there is a way to basically copy other TCU files? E.g. if I swapped 8HP75 in from M550i - could someobody download that file and flash it onto mine (of course after step 3 is completed).
Thanks!
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      09-24-2020, 02:56 AM   #10
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Quote:
Originally Posted by Alpine540iM View Post
Find it weird that people try to make huge power numbers out the 540... it's a luxury sedan weighing 3800+ lbs. jus my 2 cents
I dont find it weird at all. B58 is a great engine to put high power through - given its characteristics of it and even now the tie to TU version in Supra the aftermarket support is strong and growing .

From perspective of why 5 body its very simple, I was going to get 440i, but then found a great deal on 540i. I knew I wanted a 5 as I like the interior and comfort much better than Fxx cars. So the good deal pushed me over and I didnt have money for well speced M550 or M5. And I like to go zoom zoom .

Easy beans. The car is now M5 quick so
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      09-24-2020, 02:59 AM   #11
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Quote:
Originally Posted by DBO View Post
The part numbers are as follows. Initially I thought they may use the converter from the 550, but that's not the case. From what I've been able to tell, it's the same converter they use on the M340i (which also runs the GA8HP50)

24008632217 - MPPSK
24008632218 - stock (540i)

Yes.. to your other question. M140i comes up with same part number, so the upgrade is already fitted to that GA8HP50 as well.
Yeah just had a look on bimmercat and you're right. I emailed the dealer and will see what he says. Issue is that the guy with slipping trans has this already like you said.

To build on that, do you think that you could put a 8HP75 converter on 8HP50? Would there be benefit?
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      09-24-2020, 03:45 AM   #12
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Quote:
Originally Posted by DBO View Post
Quote:
Originally Posted by Alpine540iM View Post
Find it weird that people try to make huge power numbers out the 540... it's a luxury sedan weighing 3800+ lbs. jus my 2 cents
It's equally weird that people come to a modification forum and question why others like modifying cars or making them quicker.
Didn't mean to judge I myself am running mhd stage 2, plus catless dp. Jus think that all the trouble of swaping a different transmission into the 5er is not worth the hassle. Didn't mean to offend anyone. Do as you please.
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      11-18-2020, 01:14 PM   #13
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Quote:
Originally Posted by luke1990 View Post
Hi all,

So I have a very peculiar problem . I run a high power G30 540ix. Couple people that already run that kind of power (maybe a bit more ) ran into issues already with slipping gears in the 8HP50.

One of the people I know swapped 8HP70 into his F car. I was thinking about doing the same as 8HP70 car likely hold 1000nm (rated at 700 I know ).

1. Would it work if I found 8HP75 from g30 m550i / f90 m5, swapped it and used somehow their coding file?
2. Or is it better to go with 8HP70 from say 335d and try to get custom map? I know one guy here used the B4S Alpina flash I think for that.

If so do you know anybody who does custom trans flashes to help with this? I know xHP did something, but its not their business and also Sutphin

What do you guys think is the best? I know the mechanical issues too . Level10 builds transmissions, but I've read some not so great reviews for that.
Thanks y'all
Btw also posted in coding to see maybe if there somebody know
Would you mind if I asked what modifications you’re running? I also have a 540 that i am interested in going further with. Currently on a st2 and it’s no slouch but i am planning to go for the turbo swap next + HPFP.

Hardly anyone plays with the 540 (i have no idea why - as you said, B58 + G30 interior + price point - no brainer IMO) so pleased i stumbled across this thread!

Any tips or advice?
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      11-18-2020, 03:21 PM   #14
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Quote:
Originally Posted by tomjoml View Post
Currently on a st2 and it’s no slouch but i am planning to go for the turbo swap next + HPFP.
Have you done the xHP transmission flash yet? With the stage 2 you'd probably already be pushing past the 550Nm torque limits
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      11-23-2020, 12:58 PM   #15
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Quote:
Originally Posted by DBO View Post
It's equally weird that people come to a modification forum and question why others like modifying cars or making them quicker.
I don't mod but I agree with this comment.
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      12-07-2020, 10:26 PM   #16
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Also curious to see what you are running. I've been on Bootmod3 Stage 2 E30 for about a year (15k miles). I got XHP recently when they released it on G30 platform (5k miles). So far, so good...however, I also did get a Dorch Stage 2 HPFP during their Black Friday sales, so will be flashing Stage 2+ E30 soon! I do have plans going with VTT GC or Pure800 soon and want to hit around 550-600 WHP as my goal. You do bring up good point about transmission longevity given the torque we're putting through them...wondering if it makes sense to limit torque on the weaker gears (1, 4, 6 from my research)?
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      11-20-2022, 05:26 AM   #17
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I know we’re back from the dead, but an interesting topic is interesting.

However, I don’t get how no one here mentioned that a N63 ZF wouldn’t even bolt onto a B58 due to different bell housings lol.

On a positive note, 8HP76Z from G8x or 8HP76 from M340d xDrive would be an interesting swap. Granted you have someone who can virginize em.

Dying to see someone dip some toes into a S58 xDrive swap into a G30.
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      11-20-2022, 03:08 PM   #18
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