Originally posted by tubby17s
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Rear coilovers on e30
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Originally posted by trent View PostI Can't be the only one here who has long since ran my own rear coilover setup...
Originally posted by matt View PostWhat do you mean?
Trent, what was the extended length on the bilsteins? I might run a QA1 DR5855B (17" ext length) shock on my setup, with a 400 or 450lb spring in it.
Lsx/t56 Swap progress |----------| .0000000005% - Well below poverty line.
Getting purists panties in a knot since 2007. ;)
E30 count = 6! :shock:
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trent
Originally posted by Mike B. View PostTrent, what dia. spring is that? Shock length? Any rubbing issues on the gas filler line?
Yes, that metal covering thing isn't for the gas filler line. The only hoses that run through that piece are for the evap tank.
Eric, the idea came from the old DTM cars. The shock is just an off the shelf bilstein race shock that I found that had the correct extended and collapsed length.
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I posted a link earlier but here are some images showing my rear coilover setup. When the car is on the ground, the gap between the spring top and the top mounting point is closed. The fronts are also adjustable coilovers. With this arrangement, it is relatively easy to adjust cross-corner weights. Mine are within 15 lb with my chubby body in the drivers seat.
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I'm using 200 lb/in in the rear and 400 lb/in in the front. I know the rates are correct because I measured them myself. My front sway bar (Ireland Engineering 25 mm, hollow and attached to strut tower not the control arm) is set full stiff and the rear (Ireland Engineering 22 mm) is set full soft. Based on some pictures I've seen of hard right turns (turn 4 at Willow Springs), the inside front wheel is just barely touching the ground. If I changed anything, I'd go to 180's in the rear. Oh, my engine is a stock M20B25 and the car weighs 2200 lb (dry & wo/driver). If I had more power, I'm sure I'd go to a slightly stiffer front and/or slightly softer rear spring setup.
I've also taken a couple more pictures of the rear coilover setup the other day. They show tire clearance (205/50-15's on 7", ET 20 wheels) and the top of the shock with the spring in its normal position.
Finally, it's worth noting that there are springs available for this rear setup which range from 60 to 500 lb/in in 20 lb increments. Individual springs run around $50 to 60 and changing them is easy.
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trent
Originally posted by Bruce Colby View PostI'm using 200 lb/in in the rear and 400 lb/in in the front. I know the rates are correct because I measured them myself. My front sway bar (Ireland Engineering 25 mm, hollow and attached to strut tower not the control arm) is set full stiff and the rear (Ireland Engineering 22 mm) is set full soft. Based on some pictures I've seen of hard right turns (turn 4 at Willow Springs), the inside front wheel is just barely touching the ground. If I changed anything, I'd go to 180's in the rear. Oh, my engine is a stock M20B25 and the car weighs 2200 lb (dry & wo/driver). If I had more power, I'm sure I'd go to a slightly stiffer front and/or slightly softer rear spring setup..
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By the way, I spoke with Brian @ Vorshlag. The reason why they separated the spring from the shocks in the ASTs is due to the regulations in the racing class they used the 318iS.Erick Mahle | FullOpp Drift | YouTube
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Originally posted by Mr. Anderson...one of the most hardcore E30's around. :D
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Originally posted by trent View PostInteresting rates. I am running a 400 in the front, and 375 in the rear. However, I am running no swaybar in the rear, as I would rather compensate for roll with spring than sway bar. The car is a bit twitchy in the rear, and thus I have been tempted to try a lower rate.
BTW, is SD South Dakota or San Diego or ...?
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Originally posted by SA E30 View PostOk, is it just me or is everyone here running very soft spring rates to what I'm thinking ?
Originally posted by SA E30 View PostAlso wouldnt squat and dive be controlled by the shocks bound and rebound to an extent ?
The nice thing about coilovers that use readily available springs is that it's possible to try different combinations without going broke. They're also nice because it's easy to set ride height and adjust cross corner balance.
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trent
Originally posted by Bruce Colby View PostInteresting indeed. Are the rears in the conventional/stock position or are they coilovers? I'm aware that some people run really stiff fronts to reduce dive on braking. What do you see as an advantage in stiff springs and no swaybar in the rear? On the odd day when we have a wet track, I think it's kind of nice to be able to disconnect the rear swaybar. But that doesn't happen very often so I'm curious.
BTW, is SD South Dakota or San Diego or ...?
I am not a fan of the huge rear swaybars on these cars, as I like keeping the trailing arms completely independent. I may be doing some experiementing with a stockish bar one of these days. I am in San Diego.
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