Hello all,
I currently have oem M-tech springs in my m20 powered 323i and i have just installed slightly short stroke koni yellows (80-2522sport rear, 8641-1210sport front.
You may ask why i put $1000 worth of shocks in with stock springs. Well i'm not made of money and the shocks were worn out. So I got the shocks with the intention of more things later. I had the shocks dyno tested and the adjustment only affects the rebound. Compression damping is not changed at all with the adjustment. Adjustment is very fine. 1/12th of a turn makes a massive difference.
Installation was fine, and I am very impressed with the shocks. really transformed the car.
Front feels really good, happy as larry. My only comment would be that i seem to have an annoying "bounce" in the rear. Hit a bump and you feel the suspension compress and the body oscillates annoyingly. Upping the damping in the rear (remember rebound only) seemed to help but i could definitely feel the suspension was over damped. Over damped springs give a distinct sensation that is very uncomfortable.
From all the googling it seems my current spring rates are 150lb (~2.6kg/mm) front and 240lb (4.1kg/mm) rear.
Is the e30/mtech springs known to have "too soft of springs in the rear" ? Because it certainly seems like the rear spring is too soft compared to the front?
All of the aftermarket springs seem to have much stiffer springs in the rear than the front (when compared to the ratio between F/R on oem). eibach race is apparently 8kg front and close to 14kg rear.
Car is just a street driven fun car. Though i do intend on converting the front to coil overs at some stage (to get some front cambers and ease of swapping springs).
Side note, I have tried to calculate this all using a desired ride frequency of 2.4hz for the front, and 2.5hz for the rear. using corner weights from the internet (unconfirmed...). and i came up with 7kg/mm front and 3.5kg/mm for the rear, which is softer than oem in the rear! (yes i took into account rear motion ratio).
lots of rambling here, comments welcome.
I currently have oem M-tech springs in my m20 powered 323i and i have just installed slightly short stroke koni yellows (80-2522sport rear, 8641-1210sport front.
You may ask why i put $1000 worth of shocks in with stock springs. Well i'm not made of money and the shocks were worn out. So I got the shocks with the intention of more things later. I had the shocks dyno tested and the adjustment only affects the rebound. Compression damping is not changed at all with the adjustment. Adjustment is very fine. 1/12th of a turn makes a massive difference.
Installation was fine, and I am very impressed with the shocks. really transformed the car.
Front feels really good, happy as larry. My only comment would be that i seem to have an annoying "bounce" in the rear. Hit a bump and you feel the suspension compress and the body oscillates annoyingly. Upping the damping in the rear (remember rebound only) seemed to help but i could definitely feel the suspension was over damped. Over damped springs give a distinct sensation that is very uncomfortable.
From all the googling it seems my current spring rates are 150lb (~2.6kg/mm) front and 240lb (4.1kg/mm) rear.
Is the e30/mtech springs known to have "too soft of springs in the rear" ? Because it certainly seems like the rear spring is too soft compared to the front?
All of the aftermarket springs seem to have much stiffer springs in the rear than the front (when compared to the ratio between F/R on oem). eibach race is apparently 8kg front and close to 14kg rear.
Car is just a street driven fun car. Though i do intend on converting the front to coil overs at some stage (to get some front cambers and ease of swapping springs).
Side note, I have tried to calculate this all using a desired ride frequency of 2.4hz for the front, and 2.5hz for the rear. using corner weights from the internet (unconfirmed...). and i came up with 7kg/mm front and 3.5kg/mm for the rear, which is softer than oem in the rear! (yes i took into account rear motion ratio).
lots of rambling here, comments welcome.
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