MKB differencial
MBWorld Fanatic!
Joined: Aug 2002
Posts: 2,753
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From: York, PA
2003 C230K Sport Coupe, 1986 190E 2.3
Shorter gearing will decrease 0-60(better), decrease top speed, raise the RPM's in all gears at certain speeds compared to the old(75 MPH will turn more RPM's with the shorter than with the old), also fuel economy will suffer. This all depends on how much a change, but you will not see huge losses on top speed or fuel economy, most likely will see more of a diference in 0-60 times. Also gears will shift sooner MPH wise than before, and in the long run depending on when the shifts occur in a 0-60 run could actually hinder it since it could normally be 2 or 3 shifts and then with the new gears go to 3 shifts instead of 2.
MBWorld Fanatic!
Joined: Nov 2001
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From: Bay Area, CA
I think I am one of the few people on here who has an MKB differential. If you are going to do the differential w/o any major power upgrades, I would say it is a very cool upgrade that makes your car feel a more aggressive and slightly improves your 0-60 and 1/4 mile times. That being said traction and transmission limitations might prevent you from being able to take full advantage of the more aggressive gearing.
I had the MKB diff. installed in my 1st round of tuning. The problem was when I added a Kleemann SC in the second round of tuning, I would bounce off the rev limiter in 1st and 2nd gear. The 50% increase in power was definitely causing some timing issues. I'm not sure of the technical details behin it.
We might go back to the stock diff. in this 3rd round of tuning if we can't get the ECU to work smoothly with the increased power and MKB diff.
I had the MKB diff. installed in my 1st round of tuning. The problem was when I added a Kleemann SC in the second round of tuning, I would bounce off the rev limiter in 1st and 2nd gear. The 50% increase in power was definitely causing some timing issues. I'm not sure of the technical details behin it.
We might go back to the stock diff. in this 3rd round of tuning if we can't get the ECU to work smoothly with the increased power and MKB diff.
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Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
Had the same problem with a 99 Mustang GT
I had a 99 GT mustang, with high stall converter (2400RPM stall), 3:55 rear gears, modified valve body, Vortech blower, A/A intercooler and ECU modified by an ex Ford Powertrain Engineer. I dynoed at 375RWHP.
The ECU was just not fast enough, the sample rate between the ECU and the ADC fed from the tach, was way too slow. I could have hacked up the wiring harness and changed to an aftermarket ECU for the transmission, but did not trust the reliability.
Stomp on the the gas at 40mph, it would down shift, then hit redline (6200RPM) in about 1 second. That is the main reason I sold it .
To get a 1-2 6000 RPM shift point, we programmed the transmission to shift at around 3700RPM at WOT.
With automatics and electronic controls performance inprovements are limited by the speed of the transmission controller.
But that Ford 4R70W transmision would shift much better than the C32, quicker downshifts and upshifts, at only partial throttle and very firm, it would snap into gear. The ECU controller was too slow and it only had 4 gears.
This is why I now own a C32.
The ECU was just not fast enough, the sample rate between the ECU and the ADC fed from the tach, was way too slow. I could have hacked up the wiring harness and changed to an aftermarket ECU for the transmission, but did not trust the reliability.
Stomp on the the gas at 40mph, it would down shift, then hit redline (6200RPM) in about 1 second. That is the main reason I sold it .
To get a 1-2 6000 RPM shift point, we programmed the transmission to shift at around 3700RPM at WOT.
With automatics and electronic controls performance inprovements are limited by the speed of the transmission controller.
But that Ford 4R70W transmision would shift much better than the C32, quicker downshifts and upshifts, at only partial throttle and very firm, it would snap into gear. The ECU controller was too slow and it only had 4 gears.
This is why I now own a C32.
