Ldstang50

Thinking of putting the bigger Renntech turbos in my car. I already have their 'bolt-ons.' When upgrading turbos, is it necessary to upgrade the trans? What about rods?
Thank you for your time

wolves.creed

No need to upgrade your trans if you keep the torque under 1000. No rods needed.

Ldstang50

Thank you

KLR CLS

Not true at all. Tranny will not last long at over 700wtq. Given that turbo upgrades are capable of 850 ft/lbs at the wheels, building a trans should be part of your near term plans

Amg63-

a tune only on stock turbos are already pumping out over 700wtq.

So with just a tune on stock turbos your saying the tranny needs to be built up?

gaspam

That's not true either ... my stock tranny has had over 700 wtq for about a year and a half now with no problems and I drive my car hard pretty much all the time ....

as others have mentioned most tunes put out over 700 wtq and haven't heard many tranny failures yet and those tunes have been around a while

Amg63-

same here just recently got the full stage 2 EC tune putting out WELL over 700wtq daily driven without any issues.

Zod

where is the thread on this on this upgrade?!

Should make for some detailed insightful reading

Amg63-

haha don't get me started on this one!

my quick review= the car is CRAZY fast with it especially down low. I got a test drive In a renntech tuned car that didn't feel as quick. Definitely a solid tune from EC on this one.

raudiace4

Was this an update to the existing EC tune? I have eurocharged, and didn't know there was an update...

KLR CLS

I know of two cars that needed rebuilds on MCT trans, making high 600s whp and low 700s torque. Transmission always work great...till they don't. Don't kid yourself. Making 300ft/lbs more than stock is going to kill your tranny prematurely. Best to plan for upgrades if you want care free reliablity.

Amg63-

they have 2 tunes a stage 1 tune and also a more aggressive stage 2 tune requiring upgraded spark plugs

Amg63-

So a tune only e63 will kill the tranny prematurely? First time I'm hearing this, and it's getting me worried.

What kind of upgrade does the tranny need to stay reliable long term then?

Ldstang50

Now i'm getting confused

gaspam

call the guys at renntech, they will clear it up for you..i have talked to them man times when i have been in their shop for tune and dyno day many times and have inquired about their turbo upgrade in the past and they told me upgraded trans wasnt necessary for daily driver

technically any increase in hp over stock decreases longevity... but so does driving and putting miles on a car as well

KLR CLS

I would agree that "daily driver" is a bit of a qualifier. Ifyou are not beating the hell out of the car, and running street tires where you will just spin, you will probably survived for some time. But launch with traction a few times and you will be playing with fire. a few cars have munched transmissions with stock power and slicks.

Amg63-

Sounds like your talking RWD here. The 4matic E63 does not spin from a stop.

Do you mean not to use launch control or even mash and go from stop will cause issues?

Also, I thought the whole point of the TCU torque limits was in order to prevent all this from happening...

Stereolab42

Ouch... I have an EC tune but didn't ask for a specific stage, so I assume I got stage 1. It's plenty fast. I don't want to be faster.

shardul

iTrader: (1)

I have seen at least 5 cars that required a trans rebuild, all on stock turbos and ECU calibration.

Wickdwagon

When you say that the trans have required a rebuild, what exactly was done to the trans. Are we just talking replacement of clutch packs or significant damage.

gaspam

my jeep CJ7 needs a tranny rebuild too and it only has about 200 hp and doesnt even have turbos cant always blame tranny problems on turbos and power

PeterUbers

my two brand new 2014 e550's needed trans rebuilds within 2000 miles

shardul

iTrader: (1)

Replacement after market clutch packs.

Here is a pic of the last set i ordered for a customer

Pumpkinate

My tuned CLS63 gives no issues with normal hard driving but if I do a string of brake starts in a row i can make the transmission slip, presumably the plates get hot and start slipping.

10speed

In the summer I contacted Renntech about there tune , I was concerned on durability, a tech told me I will be fine,he said AMG's are made extremely strong,he said they have cars with 1000hp stock drivetrain and zero issues, but he did recommend if I would drag the with a lot of launches to do the clutch packs he said they tighten the tolerances and the tranny will be bulletproof.

If this is done how much are these clutch packs installed soup to nuts and while in there is there anything else worth modding .