Just got the renntech tune - but having trouble with turbos
Thread Starter
Newbie
Joined: Oct 2017
Posts: 5
Likes: 0
Cls 550 4matic
Just got the renntech tune - but having trouble with turbos
It seems like there is boost issue of some sort, when punching it the turbos will all of a sudden stop working like the pressure becomes to high and they shut off to save the motor etc. I thought renntech made solid tune jobs where you wouldn’t have t worry about hurting your equipment. Can anyone shed some light on my issue ?
Junior Member
Joined: Mar 2006
Posts: 38
Likes: 8
From: Scottsdale, Arizona
2014 CLS550 4MATIC
It seems like there is boost issue of some sort, when punching it the turbos will all of a sudden stop working like the pressure becomes to high and they shut off to save the motor etc. I thought renntech made solid tune jobs where you wouldn’t have t worry about hurting your equipment. Can anyone shed some light on my issue ?
Newbie
Joined: Nov 2017
Posts: 1
Likes: 0
CLS400
It seems like there is boost issue of some sort, when punching it the turbos will all of a sudden stop working like the pressure becomes to high and they shut off to save the motor etc. I thought renntech made solid tune jobs where you wouldn’t have t worry about hurting your equipment. Can anyone shed some light on my issue ?
IN E Mode everything is fine, smooth etc. Sport mode has a sensitive throttle response but once you WOT around 3500rpm upwards, there is a very noticeable hestitation around 4000, 4800 rpm.
It feels like a cuts out power for a brief moment and resumes again, so the result is the acceleration is not very smooth WOT. If you feather it or only 75% throttle then it seems fine.
Disappointed with this tune actually and no solution - checked fuel (98 octane) new plugs, air filters new BMC.
