Hello,
i have BMW E30 with S50 engine, i built the car for drift, and i put on drift version D2 coilovers . I think i dont have enough grip on rear axle. Does anybody have the same problem? I drive 205/40 and 215/40r17 tyres. I think if i put larger tyres it will be a little bit better, but i think, i need to modificate suspension, but i dont know what to change, dones anybody have some pice of advice? I did chamber/toe modification and i set chamber and toe to 0º.
Greetings from slovenia
Rear axle grip
Moderator: martauto
0 degrees camber on the rear doesn't sound right for a track car - won't have much of a contact patch when accelerating at full power. Would have thought -1.5 to -2 degrees would be a better starting point 
Agreed, that more rear camber maybe helpful.
Another question is what tyres and tyre pressures are you running. I helped a mate get his lap times down by some 10 seconds at a track day once by simply playing around with his tyre pressures. Also, 17" tyres sound large for a non-M3 E30 for the track. It maybe that the larger rim/tyres are messing with the suspension geometry a bit and causing you some grief.
Another suggestion would be to disconnect the rear anti-sway bar (easily done between track sessions). This will allow for more weight transfer and help to load up the driving tyres a bit. It may make the rear end a little sluggish when flicking left and right, but that shouldn't be too much of a problem for a drift car.
Lastly, are your coilovers rebound adjustable? If so a lower damper setting maybe helpful. If not, then a slightly higher ride height may offer a more compliant rear end.
Another question is what tyres and tyre pressures are you running. I helped a mate get his lap times down by some 10 seconds at a track day once by simply playing around with his tyre pressures. Also, 17" tyres sound large for a non-M3 E30 for the track. It maybe that the larger rim/tyres are messing with the suspension geometry a bit and causing you some grief.
Another suggestion would be to disconnect the rear anti-sway bar (easily done between track sessions). This will allow for more weight transfer and help to load up the driving tyres a bit. It may make the rear end a little sluggish when flicking left and right, but that shouldn't be too much of a problem for a drift car.
Lastly, are your coilovers rebound adjustable? If so a lower damper setting maybe helpful. If not, then a slightly higher ride height may offer a more compliant rear end.
Cheers,
Michael.
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DanThe
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I expect its censored because vulgarism may move onMillRat wrote:P.s. the "hashed" out word above is flick ing...
I'm not sure how that violates any language rules unless vulgarism has moved on without me keeping up..
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rix313
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What tyres are you actually using? Using a softer compound will help. What is it you want the grip for? A drift car will have a different setup to a track car owing to the fact the disaplines are different?
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Karan
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0 camber will give most grip for drifting. In fact you could even run slightly positive so when you accelerate and the car squats the wheels tuck in at the top a touch. I've seen a lot of the top end drift cars run positive rear camber
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Demlotcrew
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The Irony is that you need good grip to drift at speed!Motorhole wrote:Are we all on the same page here as to what constitutes positive and negative camber? Sounds like you're talking about negative camber, Karan
I need to look in to this a little more as the semi trailing arm has its own quirks!
Andrew
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randomspeedfreak
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as the rear squats it toes out and increases negative camber. if at rest you are at 0 it will increase with suspension travel.
try a little toe in on the rear...although i dont know much about drifting it could be worth a punt
try a little toe in on the rear...although i dont know much about drifting it could be worth a punt
Hello,
im sorry for my late reply. Im using 215/40r17 or 205/40r17 tyres at 1.8 or 2.0 pressure depends which tyres im using. The car is for drift use only and i compare my car (E30 S50B30) and friends e36 m3 (S50B30). When we drag race my car i a lot faster, but when drift in corners he is faster, i know i use smaller tyres, but i think i would be faster. I think my car si lightweight and setup of coilovers is wrong, now im looking for correct spring ratio, i think if i put 6kg/mm will be better, but im not sure. I put the rear chamber to 0 and toe +1.
So i ask here, might somebody have same problems:)
im sorry for my late reply. Im using 215/40r17 or 205/40r17 tyres at 1.8 or 2.0 pressure depends which tyres im using. The car is for drift use only and i compare my car (E30 S50B30) and friends e36 m3 (S50B30). When we drag race my car i a lot faster, but when drift in corners he is faster, i know i use smaller tyres, but i think i would be faster. I think my car si lightweight and setup of coilovers is wrong, now im looking for correct spring ratio, i think if i put 6kg/mm will be better, but im not sure. I put the rear chamber to 0 and toe +1.
So i ask here, might somebody have same problems:)