Originally posted by freeride53
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SCCA STX E30 Build/Introduction
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Mark Scroggs
1985 528e 5-spd Cosmosblau
1988 325i/a 4D Bronzitbeige
2013 Ford Focus ST SCCA GS #49
2013 VW Tiguan SE 4-Motion
Past
1989 325i 2D Zinnoberrot
1991 318i 4D Alpinweiss
1987 325is Alpinweiss
1986 325es Zinnoberrot
1989 325is Diamantschwarz
Drag racing is for fast cars....
Autocrossing is for fast drivers!
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Honestly, for me, the biggest challenge of an E30 in STX was the steering. Slaloms are painful with the stock rack. (My red car used to be a well built STX car.)
On paper, and in reality, the 325is is going to face a very, very uphill battle. Either way, though, it'll be a damned fun car.2006 GMC Sierra 2500HD 4WD LBZ/Allison
2002 BMW M3 Alpinweiß/Black
1999 323i GTS2 Alpinweiß
1995 M3 Dakargelb/Black - S50B32/S6S420G/3.91
1990 325is Brilliantrot/Tan
1989 M3 Alpinweiß/Black
Hers: 1996 Porsche 911 Turbo Black/Black
Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
sigpic
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Originally posted by race2win View PostCivics are around 2000 lbs, 105-ish WHP, 195 tires, not sure what the width is but they are narrow. Yes, they are considerably lighter, but the point is lighter-is-better, & I hope to use that as an advantage with the E30.
I won't need to run ST Civic times to win STX next year (they will no longer be able to run STX starting 2012), I figure I can still be a second slower than an ST Civic & still win STX! :D
BUY MY WHEELS! BBS E50s!!
http://www.r3vlimited.com/board/showthread.php?t=275407
Originally posted by Lurker27Any man will tell you being blown is better than being stroked.
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Originally posted by 86 325e View PostCivics are usually swapped with a DOHC. They usually push around ~180-190hp. They usually run 205's.sigpic"If one does not fail at times, then one has not challenged himself." -Ferdinand Porsche
The ugly car: http://www.r3vlimited.com/board/showthread.php?t=209713
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Originally posted by race2win View PostHowever, I must say, do you honestly feel the ST Civics are that fast just because of the tires? Or, just maybe, it has something to do with 8+ years of National developement & collaberation, between literally hundereds of drivers & many, many National Champions??Ralph Zajac
1989 DSP 325i
Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving.
-- Colin Chapman
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I'm new to BMWs (don't have one yet), but not new to autocross. Currently thinking of building either an e30 or e36 STX car.
Would there be any benefit to running 17x8 wheels? Thinking mostly of the Apex Arc-8. Although not as light as the 15x8. Should help with the gearing slightly. And should provide more options for tires. That's assuming you can fit something wider than a 225. Is it possible to fit a 245 on the e30?
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Yes it's possible to fit 245 and 255 and 275 with work :)Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827
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Originally posted by Zac.Autox View PostI'm new to BMWs (don't have one yet), but not new to autocross. Currently thinking of building either an e30 or e36 STX car.
Would there be any benefit to running 17x8 wheels? Thinking mostly of the Apex Arc-8. Although not as light as the 15x8. Should help with the gearing slightly. And should provide more options for tires. That's assuming you can fit something wider than a 225. Is it possible to fit a 245 on the e30?
Update on my build...
Although I don't have anything big to report as far as parts installed, I have made some updates to the car & plan to take it out this Sunday for a local SCCA event for some fun. Most of the updates have been centered around preventive maintenance so far to establish a solid foundation.
First off, installed a S3.73 diff...
Keep in mind my car is a standard 325i coupe, which did not come with a limited slip diff. The STX rules allow any limited slip unit that retains the original final drive ratio...so I picked up a pretty tight 3.73 LSD differential from a 325is.
I picked up this unit used for $200, which seems to be about "going rate" for a decent one. However, it came out of a junk yard so who knows what kind of mileage & condition it's in. I did not check the torque of the LSD unit, but it "felt" very tight so I decided to go ahead & install it as-is.
I contemplated a few options initially...First was to completely rebuild it with 2 extra clutches for a heavy lock-up, as well as a 3-clutch set-up which would provide 40% lock. But after talking with a few E30 experts (such as Tony at Edge Motorworks in Dublin CA) we decided those options may provide too much lock up for an autocross application...especially on street tires. With as much "turning" there is, too much lock-up means constantly chasing the back of the car on-throttle...so some slip may be a good thing. The goal is to start with this used unit to establish a baseline, if too much slip is present, then we will rebuild with 2 clutches & evaluate further...
More to come, stay tuned!!Mark Scroggs
1985 528e 5-spd Cosmosblau
1988 325i/a 4D Bronzitbeige
2013 Ford Focus ST SCCA GS #49
2013 VW Tiguan SE 4-Motion
Past
1989 325i 2D Zinnoberrot
1991 318i 4D Alpinweiss
1987 325is Alpinweiss
1986 325es Zinnoberrot
1989 325is Diamantschwarz
Drag racing is for fast cars....
Autocrossing is for fast drivers!
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Originally posted by Jean View PostYes it's possible to fit 245 and 255 and 275 with work :)Mark Scroggs
1985 528e 5-spd Cosmosblau
1988 325i/a 4D Bronzitbeige
2013 Ford Focus ST SCCA GS #49
2013 VW Tiguan SE 4-Motion
Past
1989 325i 2D Zinnoberrot
1991 318i 4D Alpinweiss
1987 325is Alpinweiss
1986 325es Zinnoberrot
1989 325is Diamantschwarz
Drag racing is for fast cars....
Autocrossing is for fast drivers!
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Originally posted by nrubenstein View PostHonestly, for me, the biggest challenge of an E30 in STX was the steering. Slaloms are painful with the stock rack. (My red car used to be a well built STX car.).Last edited by wannaBMthree; 11-11-2011, 02:38 PM.
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Good luck, let us know how it goes! I went with a 4clutch diff build for my autocross car, works great with dot R tires ;) I do still have the stock rack, it blows.Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827
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Originally posted by race2win View PostAll true, however keep in mind that in STX the rules only allow rolling of the inner fender lip...no changes to the outer contour/shape of the fender is allowed. With that in mind, anything larger than 245 isn't possible in an E30...& even 245s are very questionable. I think it may be possible, but the ride height may have to be too high to be beneficial.
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Can't wait for that ^ SM here we go. but this is offtopic to STX discussion!Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827
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