Quote:
Originally Posted by Dackelone
Have you guys seen the latest copy of Excellence (October issue) page 56, TC Kline's 128i :
and I quote the mag...
"The Ultimate handing machine: TC Kline's suspension tuning transforms the entry level 128i Coupe into a car that can rival the 1 series M Coupe for pure driving fun!"
Its a really good read! I have scanned the article bellow...
Dackel
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What suspension did the 128i start with, standard or sport?
In the end, he says that if setting up for the street, use a 350lb spring in the rear.
The 128i in question already has a 350lb rear spring stock.
The 128is has a 350lb spring rate in the rear. 500lb is what worked best.
A 43% increase. Using that same percentage increase, the optimal front rate would be around 180lb for the 128i, maybe 200lb for the 135i.
So basically, to get the handling he has for the street, replace the bushings, stay with the stock rear springs, possible increase the front spring rate, maybe taller bump stops, and get better dampers, which I think is very important as the stockers don't do a great job. Then dial in -2 (negative) degree camber in front and -1 degree in back. This alone will give improvements, but would probably give greater tire wear.
I too don't get the 19" wheel/tire package, as more un-sprung weight is a negative for handling.
I can understand his comment about looks on this one. He said to use spring matched to grip. Going to larger diameter reduces sidewall height, but that doesn't necessarily mean that overall grip has increased.
I'm sure this setup goes for the 135i as well, except a bit higher rate spring in front for the added weight.
It would be cool if he did a 135i setup.