OJPAMG

Had my trans out so I too the oppertunity to have my stock torque convertor race prepped with a better lock up clutch,better bearings,they furnace brazed the fins and raised the stall speed to 2600.
Finally got a dry day to try it out, it is nothing short of AMAZING!!
The car was always strong off the line but now uncontrollable.
from a dead hit it is INSTANT tire annileation(SP)

If you are looking for insane holeshot power let me know,this guy is one of the if not the best in the business.

I am bringing the valve body to a Racing Trans company next week to get it modded also to speed up and crispen the shifts
hoping to offer this service also once its tested

kjlindgr

How much was the converter and how is normal driving?

OJPAMG

Convertor was around $900 with the new HD bearings and clutch.
You can definetly feel a "looser" feel taking off from a stop but nothing
that feels out of the norm or uncomfortable by any means.
Some people get the wrong impression from a higher stall convertor.
Mine would be considered a 2500-2600 stall.
This DOES NOT mean that the care will not move until this point just that
the convertor will not be aggresively coupling until it reaches this rpm.
at anytime you are above this rpm it would feel no different than your stock one feels
and once at cruise speeds your convertor clutch is locked.

chiromikey

congrats on the tc but i wouldn't let anyone touch your valve body unless they've got extensive experience with amg trannys...oh wait, that's nobody!

AgSilver

It's just a 722.6 tranny . . . these guys know a little about it
http://www.southernhotrod.com/SHR_home.html
http://www.importperformancetrans.com/722.6.shtml

chiromikey

lol, famous last words..."it's just a 722.6". i've heard that speech several times since the debut of chrysler's lx platform and not once has the outcome been pleasant when the practice was applied to an amg.

Exotic-metal55

Do you have any lock up issues? Like sudden un-lock -lock issues at cruise? Extra noise on lock up or jerky-ness? I assume you had him raise the stall by 700 RPM ish? Do you know what STR you have? Why were the clutches changed? We have a duel clutch stock, I thought?

Just asking, as at some point there may be a line that gets crossed on stall speed and the ECU will not like it.. Then custom tuning will have to come into play..

MJ50

post some video clips!

AgSilver

What have your heard? Please share your info with us.

chiromikey

it's not up to me to give names but there have been 3 transmissions (that i know of) to poop themselves after valve body work from guys that claim to be experts on the lx platform. it's not, but sounds similar to mhp doesn't it.

MB_Forever

+1000000 aside from the E55, I know of one CLS55 that suffered that same result

OJPAMG

The guy that owns the company doing it has had 2 Benz V12 twin cars of his own and he claims he had it down no problem.
He is a GENIUS when it come to the inner workings of a transmission and actually studies the actual flow of fluid and clutch applications to make the modifications.
He actually designs his own custom valve bodies for many racing transmissions.

Ive put only about 100 miles since the convertor and trans freshen.
I would have to ask him about the double clutch but i believe he uses a
better friction lining on the clutch(s).
I have not felt any out of the ordinary lock up issues and the stall if i had to do another would be about 100-200 tighter as it really doesnt need to be 2600,for guys that have pulleys their boost would come in sooner than my stock setup and could actually go even a little tighter

What exactly is "STR"? I am not familiar with this.

chiromikey

if you go do try his valve body please post the results...good or bad.

OJPAMG

Will do,I have total faith in this,but ya never know,I wish i could get into the computer and play with the trans settings also.

I know there are a few guys that tunes these cars,what are they using for software? I know it can be cheap but I would like to get my hands on it.

bassn_07

I tried a valve body from Builderbill and at my next track day I blew my torque converter. Whether or not it was from the valve body, I don't know. All I do know is that my transmission never had a hiccup before the valve body mod. It blew on a Friday night after my first pass and my car had a new transmission and torque converter installed and ready for me on Tuesday. IMO...stay away from it unless you're willing to take that chance.

jangy

I can second mikey's point. It isn't that we don't want improvement in those areas but we just have not seen a mod that has the kinks worked out. As he mentioned, we hear the comments about the trannys being the same and even made by Chrysler and still there are always issues. I also tried a valve body mod 4 months ago and it did not turn out well. Luckily no damage but driveability SUCKED so I stopped working with the shop.

TCU upgrades, ala RennTech, will be the need alomg with hardware.

OJPAMG

I want to purchase the ECU/TCU software and do the tuning myself.

jangy

We all do. What software you going to buy? ECU has been done but TCU will take some major play time. If you do it and show results, it will sell.

stevebez

The tuners are still fishing when it comes to the the TCU / EGS ... all trial and error stuff. I dont think anyone has a code reader/writer that delivers understandable code.... they change some HEX codes and see what happens and so on ... then slowly narrow down which HEX codes affect what.

At least thats what it looks like to me.

Exotic-metal55

STR=Stall Torque ratio. I copied a little info below on it.

2) Static Torque Ratio.

"The stall torque ratio is the amount of engine torque that the torque converter can multiply at a particular rpm level. By definition, stall torque ratio is when the turbine is at 0 RPMs and the converter is at maximum designed stall. This will produce a positive push on the turbine to increase the torque to the input shaft of the transmission, multiplied by the designed stall torque ratio of the torque converter. For example, a stall torque ratio of 2.0 would multiply 200 lb. ft. of engine torque to 400 lb. ft. of torque at the transmission input-shaft. The misconception of stall torque ratio is that more must be better. This is not always the case. High stall torque ratio applications, typically are for industrial equipment or engines with limited low rpm engine torque. With high stall toque ratio converters, there are important trade-offs. What you take at one end you give up on the other. Typically, a torque converter with a very high stall torque ratio, such as 2.0-2.5, will be much less efficient above its rated stall speed. There is a sacrifice in higher rpm efficiency to achieve high stall torque ratios. That lower efficiency translates into less horsepower transmitted to the tires over an RPM range. The problem with a high stall torque ratio converter is that it is only high while the car is not moving. Maximum stall torque ratio occurs at wide open throttle with no rotation of the transmission input shaft. As the input shaft starts to rotate with vehicle forward movement, the stall torque ratio will become non-existent much sooner than a converter of the same stall, with a lower stall torque ratio." (Yank)

OJPAMG

I dont know exact numbers,but we are not talk a very high stall convertor. what is read above come into play when you are using convertors that stall in the 3500 an higher range and you have a motor that shifts at a lower rpm.
Witha stall of 2600 and a shift RPM of 6000+ there should be very litttle change if any in hte STR
I am not sure on the Benz lock up strategy,but if it locks the convertor at any point during a wot run then the motor and trans are a direct 1-1 ratio and there is 0 slip to be measured.

blackbenzz

Let me know if you find out. I would ove to be able to tune my own car!
So thats what happened. I warned you about him

mxzxracer16

I also have just got a custom torque converter for my e55. From a big company in california stall set to 2500 only part that is stock is the housing, full roller bearings installed and furnace brazed and built everything should be here next week! After I install Ill post who I got it from and if it works it was a kind of R&D for the company so the price I paid is not going to be there sales price is what they told me. Im very excited. They sent me cad draw drawings and told me it will be 33% more efficent, and should "torque magnification" of a 100 or so more Foot Lbs.

Jakpro1

Yikes bro. That seems kinda high.

Let us know how that works out.

I have this image of the car just slipping like crazy under normal around town cruising when the R's are pretty low.

My higher stall TC is just raised a few hundred rpm so she bites just as the mountain of torque hits at 1500 or so.

izzyz28

If the converter is done right it will drive almost normally around town. I had a 9.5" 3,600 stall converter in my DD Camaro for over a year and you could drive around all day without excessive slipping. Even when you put your foot in it the converter would flash and then tighten up. However, since the huge stock housing is being used I'm not sure how I'd feel about anything approaching 3,000 rpm, but 2,500 sounds perfectly streetable.