[wgknestrick]

Just data dumping here what I have found through some heavy Googling:


Exedy offers upgraded clutches for 6R90s (ford variant) and 6HP26

http://www.exedyusa.com/race_clutch/...ssion_kits.php

Exedy claims these clutches have both run sub 10s quarters. We do not know if these are compatible with our transmission. This is hope that some type of solution exists for big HP guys.

Good overview on our transmission and common issues:
https://sayyarti.wordpress.com/2015/...ission-issues/


Link to Sonnax repair kit
http://www.sonnax.com/parts/3052
http://www.sonnax.com/units/415-ZF6HP26
forum experiences from zip kit
http://www.bimmerfest.com/forums/sho...=788295&page=2

[wgknestrick]

Here is a fantastic thread on cross compatibility of 6R80 transmission parts compared to 6HP26s

Basically the 6R80 is a ford variant of the ZF unit licensed by Ford and used in 6.2L trucks and mustangs. The aftermarket has found these to be pretty robust and Ford has improved on several weak areas over the ZF. The other key is that domestic parts are much cheaper.

http://www.aussiev8.com.au/driveline...t-upgrade.html

I feel there is a significant upgrade to be found here "mechanically". I don't know if software, TCU is still an issue as I am not familiar with that end.

It has been noted that the transmission is self adjusting and needs to be able to increase holding power. I cannot verify if this is true or just forum speculation.


This has been copied from thread above to preserve important information

For a while now I have been asked a lot of questions about the 6HP26 input shaft by the Ford guys.

Customers have advised me that this reasonably simple upgrade by some companies can cost between 5 and 7k and that’s without having the converter looked at or upgraded.

I think its common knowledge now that the ZF box will snap an input shaft and the intermediate shaft if you’re pushing it, the transmission software/tune is a contributing factor but upgrading the two shafts will increase the reliability of the transmission significantly. I have seen and heard of cars running into the 8’s at over 160 mph in America with the 6R80. The ZF is pretty much an identical transmission with many components directly interchangeable, some need a little modification.

Some shops have a replacement shaft for both pieces and others use Ford 6R80 components.

Personally I like the 6R80 parts; they are cheaper, proven to be up to the task and come with several added benefits.

The 6R80 pump assembly will go straight into a 6HP26; it has a larger diameter stator shaft with the same spline as many GM transmissions, Powerglide and Turbo 400 etc. The pump gears are wider which is desirable, especially as the ZF unit is so hard on bushes. The GM spline opens the door to a wider range of high performance converter parts, multi plate clutches and performance converter combinations.

For those that want to stick with the 6HP26 Converter, the 6R80 splines can be easily cut into the ZF turbine hub and a GM sprag inner race is available.

The 6R80 input shaft is also known as the “E” clutch drum; this part is significantly larger in diameter than the 6HP26 shaft. The sealing ring grooves are also not as deep as the ZF shaft so it is superior in all ways. When using the 6R80 shaft you cannot use the ZF sealing rings. You must use the 6R80 sealing rings which are available as both scarf cut Teflon or a solid Teflon ring whatever you prefer.

The “E” Clutch commonly has 6 lined plates and some factory boxes will have 7 depending on designation. The 6 plate clutch has 3.0 mm steel plates while the 7 plate has 2.4 mm steels.

I have toyed with the idea of having steel plates custom made to accommodate more frictions but I think 7 plates does the job well and the factory steel plates are treated to increase heat resistance and lubricity adding to its durability. Any plates I can have made won’t have these advantages.

Exedy have a kit available with some friction plates and steel plates which I have used but it is also quite expensive. I don’t see any significant advantage to use the Exedy plates over genuine ZF frictions and steels but others may have their own opinion on that. I have used the ZF steel plates with the Exedy frictions without any problems.

This transmission has a desirable range of piston travel in the “E” clutch, adding more lined plates requires more clearance and therefore increased piston travel. Adding more frictions can come with drawbacks with shift quality and the transmission programming. The factory uses a maximum of 7 plates and that’s enough to snap shafts so I don’t think friction capacity is a big problem for the majority of people.

The ZF has a couple of different types of intermediate shafts and both will snap at high horsepower levels. Some people believe cryogenic treatment is enough to eliminate the weakness but I am not convinced. Billet shafts made locally are available for roughly $1400AU to $1600AU.

There is a 6R80 300M shaft available from Canada which retails there for about $565US.

The upgrade components are readily available and are not that expensive compared to the prices that have been reported. The components can be supplied as a kit along with a strengthened converter for around 2k.

With the transmission on the bench it takes about 3-4 hours to carry out the work. Guys who have done it a few times will be able to do it in less than 2 hours.

It is worth doing a little research on this upgrade as there is serious money to be saved if you’re contemplating or need to have it done.

Yeah, I have sent you an email.
I haven't got around to finishing this thread off.
Some people having trouble finding some parts due to Ford and Mazda's poor diagrams.
3 bearings that are required are:
1 x 9L3P7H 375AA
1 x 6L2P7D 283AA
1 x 6L2P7A 453AC
These bearings can be sourced from Ford or Mazda.

When I get a chance I will look at altering the rear of the trans to accept more 6R80 parts as the power potential for the 6R80 is much higher than the ZF unit.
Would also keep costs down compared to buying the after market intermediate shaft for the 6HP26. For that money you could buy a complete 6R80 and the TCS intermediate shaft and be able to go well into the 8 second zone.
There will be more after market parts available for the 6R80 in the coming years, it'll be here for a while yet.

[DUI Elite]

Has anyone ever tried using the mechatronics unit from a 3/2007+ 335i in the 325i/330i transmission? (To run the Alpina flash)

[iqraceworks]

I know this is an old thread.....but did anyone finally come out with some options to make these 6AT's hold more power? The cars have been out for almost 13 years.....you would think there would be some good options by now.

Update??

[Jeef]

Originally Posted by iqraceworks

I know this is an old thread.....but did anyone finally come out with some options to make these 6AT's hold more power? The cars have been out for almost 13 years.....you would think there would be some good options by now.

Update??

you can try propulsive dynamic or nizpro

[iqraceworks]

Originally Posted by Jeef

you can try propulsive dynamic or nizpro

For what? Full rebuild kits? Valve body kits? Other?

Doesn't really seem like there is much info out there......which pretty much answeei my question.

[ragingpanda]

I think swapping to a manual transmission is the solution for holding power in this platform.

[iqraceworks]

Originally Posted by ragingpanda

I think swapping to a manual transmission is the solution for holding power in this platform.

From everything I've ready, that's a royal pain in the butt because of the computer/electronic issues you run into.

I would love to swap in a manual.....is it easier than people make it out to be? Any good step by step DIY's?

[Jeef]

Originally Posted by iqraceworks

For what? Full rebuild kits? Valve body kits? Other?

Doesn't really seem like there is much info out there......which pretty much answeei my question.

Originally Posted by iqraceworks

From everything I've ready, that's a royal pain in the butt because of the computer/electronic issues you run into.

I would love to swap in a manual.....is it easier than people make it out to be? Any good step by step DIY's?

I'm pretty sure either of those two companies will send you a built trans as long as you send them a core. Reach out to them. If you go Nizpro route be ready to pay shipping costs to Australia and back.

There are a few people running upgraded AT transmissions.

Manual swap is not a royal pain. many people have done it. I thought this conversion is well documented?