AMG DTM 190 Rear diff!

[BlackC55]

Mercedes AMG race diff on eBay (end time 08-Nov-10 18:03:05 GMT)

Could this be a very rare item for a 190?

 

[Rob77]

Presumably this would be ok for road use?

 

[d w124]

Presumably this would be ok for road use?

Why not?

 

[BlackC55]

The ratio may have to be changed but what a rare item.

 

[Rob77]

Why not?

I was thinking the ratio might be absurdly low or something so I'd end up screaming round country lanes with the tacho needle bouncing in and out of the red.

I've used race prepped bikes on the road and that was the effect then.

 

[Rob77]

The ratio may have to be changed but what a rare item.

I just used an online diff ratio calculator and discovered it would have my car redlining at not a lot over 100mph. So not much use on the road.

What would be involved in changing the ratio? And would changing it defeat the object of getting it in the first place?

 

[talbir]

Yep, great diff for the traffic light races but with a mighty 4.64 ratio, it's useless above 50mph where high revs would be ultra-intrusive....plus....top speed would reduce to something less than 110mph on a stock190e...

But what a ratio ! Stock would have something like 2.xx or even 3.xx at most.

cheers
talbir

 

[Will]

I'm guessing that as the DTM cars would make peak power further up in the rev range, and indeed rev much higher than any roadgoing 190E (10k+ RPM), that could be why it has such a high ratio (4.64:1)

All of the 16v cars have an LSD or ASD setup with a 3.xx+ ratio IIRC, and I think the roadgoing Evos are higher still.

Will

 

[Rob77]

Yep, great diff for the traffic light races but with a mighty 4.64 ratio, it's useless above 50mph where high revs would be ultra-intrusive....plus....top speed would reduce to something less than 110mph on a stock190e...

But what a ratio ! Stock would have something like 2.xx or even 3.xx at most.

cheers
talbir

Yes, I'd want 2.87 (AMG 3.2) to 3.07 (Euro Spec 2.6 & 16Vs)

 

[Rob77]

I'm guessing that as the DTM cars would make peak power further up in the rev range, and indeed rev much higher than any roadgoing 190E (10k+ RPM), that could be why it has such a high ratio (4.64:1)

All of the 16v cars have an LSD or ASD setup with a 3.xx+ ratio IIRC, and I think the roadgoing Evos are higher still.

Will

Yes it would want to peak out in top, perhaps on a short circuit, but it would peak out at higher revs and so higher speed.

 

[Rob77]

I'm guessing that as the DTM cars would make peak power further up in the rev range, and indeed rev much higher than any roadgoing 190E (10k+ RPM), that could be why it has such a high ratio (4.64:1)

All of the 16v cars have an LSD or ASD setup with a 3.xx+ ratio IIRC, and I think the roadgoing Evos are higher still.

Will

This link has a list of all the ratios:

W201 Differential Gear Ratios [Archive] - 190 Revolution

Seems the Evo 2 was 3.46