Originally Posted by
Billy22Bob
LOL.....reverse
But my original question was going "taller" in the spline/pinion....2.8 against the stock 3.07.
32Krazy was commenting that others have gone the other way....3.55
1) I originally thought longer legs were in order here given our torque etc.... although I'm hearing it will "broaden" the gear spacing and would be a little less "flexible" for racing. Hence 32's note re 3.55 would would bring the spacing in and possibly "add" flexibility in shifting out of corners. I guess longer (2.8) would reduce a little wheel slip as well, but obviously you wouldnt power out as quick compared to a 3.55.
As stated my long legs were to keep the drive through the full 1/4
The data I'm looking at 11.7/117mph finds a 3rd to 4th redline shift at 9.4seconds through the 1/4 at 100mph, I'm guessing that that equals time off the pull and could be worth 0.1 or maybe more....???
Going to 2.8 would push this shift out another 10mph. So it would be changing at the flag - well 1 second later anyway.
2) if anyone knows of any off the shelf kits for the SLK32 bolt on diff - much appreciated.
I would have thought with the added torque we could sacrifice some gearing, however what I'm hearing is that....more is never enough...."Drove it like you stole it"....and who cares if she changes twice in the quarter....or is limited to 180mph down the straightaway, .....quick is best and hence a 3.27 or 3.55 is the most popular call.
Mind you top speed comes in from 180 down to 169 to 156mph respectively....
whereas a 2.8 lengthens her legs to 197mph (316kph) at 6000rpm* and if you have an extra 40kW from mods - you chould possibly get there. As long as your tyres are good for it. And for the 1/4 she changes 3rd to 4th at 116mph....about 20m before the line.
*based on 6000rpm and SLK32 setup17x245/40's 1972mm circ. - SRT6's are slightly larger with 19/255/35's at 2077mm circ. - so multiply the above numbers by 1.053.
So 180mph becomes 190 and 197mph becomes 208