Good reading, good going guys.

 

talked to renntech,...upgrade for the porsche is $3,500...they have done several (996 and 997). It is for the clutches (and TCU I think) and they modify the gearbox to handle the double sided clutch packs rather than the single sided that come in them oem. They are in Florida.

 

i contacted freediestransmissions.com again and asked them

"what do you expect new torque handling capabilities may be? i dont expect you will have a certain answer but perhaps an estimate? also some transmission rebuilders are using kevlar clutches. do u have access to these? These guys on porsche forum looking for something to compare it to MKB. MKB in germany does some sort of TCU flash and build that claims 1300 newtons."

their response was as follows:


"1) Cooling/Durability: the amount of transmission fluid helps in keeping the transmission cooler and thus extend its life. This is why you have a differently sized pan (to hold more fluid). The more fluid your transmission has, the cooler it stays. The cooler it stays, the longer it lasts. So a second cooler in itself does not necessarily help (since you asked that) but the additional fluid it would hold, would do the trick. A specially made pan (also optimized with air channels to tool it) would be most advisable. Our rebuilder says we can custom-build a matching pan (with the knowledge of the available clearance of your Porsche) to hold the largest amount of fluid; and with extra cooling features.



2) Kevlar clutches: yes, we can get, and use, those. They would take the heat better than factory. Cost a little more, of course (we would have to check the difference but shouldn't be significant in the big picture). There is also a question of the use of single- and dual-side clutch disks. We can fit 2-3 more clutch disks in each pack with the use of thinner steels.



3) We do not want to venture a guess at any numbers/values as to the increased durability. For one we cannot really measure, and for another, there are other components involved, so an exact value in Newtons would be highly debatable and of academic value only. We could successfully argue a higher number in any debate, but feel it would not contribute to our credibility.


4) other upgrade suggestions: a custom-built Torque Converter with dual clutches would also make a big contribution, and reduce stress on the transmission. It might even be possible to build one with 3 clutches."


FixEuro.com

 

I got my tiptronic back and have been driving it a bunch...

went through a drum of VP109 with a little help form Bmoores

Tranny is already giving me some trouble....if i am in fourth gear accelerating hard and try to drop it down to 3rd, the revs jump up and down a bit. I have no problems doing rolls from second gear at 1.6 bar from 40 MPH to 150+ (for now).

I usually only drive the car for 10-20 minutes at a time, especially i am running it hard to keep the tranny temp levels down.

Car is supposed to be putting out about 630 tq and 540 hsp at the wheels on a mustang AWD dyno on high boost (1.6 bar with a 1.7 spike) (see my other thread that vividracing started to see the actual dyno).

Anyway, Motorwerks in Houston,TX will be doing my tranny build once I break it. It is ~$6k for a bulletproof tranny that can handle 1000 hsp/tq with a modded TCU (does not include valve bodies or TC)...if i add in a TC, oil coolers etc... I have a feeling this will turn into a $10k adventure with labor).

 

$10K thats still not bad, I recon the manual guys would have to spend that to get a standard 6 speed to handle 1000bhp. No standard 911 box is going to last very long eith Big HP figures.
My advice would be get every thing done you can whilst it out, will save you pain later and you know you will only wish you had done it.

I will send mine to MKB in Germany when mine eventually fails.
Frank

 

This might be a stupid question, but is there anything we can do to the transmission prevent as much drivetrain loss?

Thanks!

 

try a 6 speed!

 

My 95,000 mile '02 TIP has a gasket leak between the transfer case and the transmission. Way up high so it and the motor have to be pulled to attempt a fix. I am told the two are sharing the same fluid since they are bolted togather. The same for the torque convertor.. The tranny is an MB722.6 and is different than the ones used on the Mercedes ML 500 in that the 911 is AWD and has the differentials inside of it unlike the MB. The seal leak is a rare occurence but that does not ease my pain. I am in KC area and nobody here has ever pulled one of these apart so I have no idea what to do to fix it. The dealer can not get all the parts since Porsche does not sell them. Its just one of those " you will have to buy a new transmission sir " scenarios. All these posts about clutch packs and other modifications I have no clue who is capeable of doing this kind of work. Even the most savy Porsche techs are afraid of this thing it seems. Anybody with a mechanic who can actually say " yea I've had that apart and here is how it is " please let me know so I can get my beast back on the road! Thanks and I hope this helps build your data base. ps. As far as how many hp its capeable of all I can say is I have fed this one hard and it works like a charm but is too slow to respond for racing. Not to mention the tranny mount broke and the gasket blew. Go figure....

 

This might shed some light.

https://www.6speedonline.com/forums/...ip-tronic.html

Pulling the engine is not necessary.

 

Thanks for this info. Very enlightening and I have finally found someone who has been into these before. I am still curious though if the transfer case and transmission share the same fluid. I was told it does and its about 9 quarts total but the photos I see here would suggest these cases are having their own seperate fluids??? Would be nice to get a clue as to how low mine really is at the moment as I have monitored the leak pretty well up to now.
Best regards

 

Vivid offers a "bulletproof" tranny rebuild for $3400, the TC is an extra $1200

 

Add Content

 

Well I am stuck.

Mechanic pin pointed the issue exactly to the spot on the picture. Whining and clunking there.

No one is willing to take on my car and just say get a new tranny


This is the problem


Issue is right in here :

 

There is a roller bearing in there and only one place get it. This place in Lithuania or something. It's pretty cheap tho. I've actually got 2 but they are used.

http://www.lodixtrade.hu/webaruhaz-termek-F-232848-&lang=en

Any leak should be able to be fixed with gasket set IPT has.

This is NOT a difficult fix for a typical mercedes transmission or other qualified shop provided the bearing is truly the issue. That cover comes off and the bearing is housed IN that housing. I likely have a photo at home.

 

Dear Pumptech,

thank you for taking the time to read and reply to my problem.

1 gearbox rebuilder said a knocking can't come from a bearing, a whine yes but not a knock and that it's probably worn cogs, aka a new tranny time.

Another person said it could be the bearings causing the issue.

Everyone else wanted to take a look first.

What I meant was, if I take that back cover off where the yellow arrow is pointing, will ATF leak out or Diff fluid?