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Unread 11-16-2009, 11:45 AM
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Join Date: Jul 2004
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Default Re: Vorshlag $2010 GRM Challenge car - BMW E30 V8

Project Update #3: I worked for about 6 hours on the E30 Saturday and got a lot of little stuff done. Beautiful weather, nicest day of the year to date. Measured the starting ride height & camber at each corner, track width front and rear (63" and 63-1/2" from outer sidewall to sidewall - that's narrow!) and then measured a bunch of other random stuff. Once it was on the lift I cut off the rotted OEM muffler to keep from banging my head on it, as it was hanging down about 20 degrees from horizontal.


Yummy - a diff leak we'll surely have to address. Looks like fairly new Voughtland springs and KYB Gas-A-Just shocks

The goal became "get some weight off" and we did. Thanks to Paul M for stopping by from 1-3 pm to help - we got the front and rear bumpers and supports off, all of the bumper trim pieces, and both horns. I also swept the bottom of the car free of cob webs (there were a LOT!) and blew out pounds of dirt and mud from the bumper areas.


~78 pounds of crap removed

Just for grins we test fit the 18x10s to the car, but I will say this one time: we cannot afford to use the 18x10" wheels on the car for the GRM Challenge. Just wanted to get an idea of what a 10" wide wheel would look like. We're looking at lightweight steel circle track wheels for our final solution. So this was hardly the technical test fit that the car needs, just a quick "lets take a look" picture or two of the 18x10 D-Force wheels with 265/35/18 tires slid under the fenders of the E30 with the suspension near ride height. It looks like the flares we will end up with should only be 2-2.5" wide, which is manageable. This would put our track width on 10" wheels at around 67" wide - which is still pretty narrow (that's about what the E36 M3 is on stock wheels, which is a narrow car).



And here's a quick comparison of the E36 non-M 5-lug brakes to the E30 stuff.


Our selection of cheap 15x10 steel wheels in 4x100 is "zero". The potential E36 5-lug swap opens up our wheel (and strut!) options considerably

Once I got the old 14x6" E30 wheels back on I rolled it outside, washed the whole car including the newly revealed areas under the bumpers, and claybarred the hood, trunk and a fender (didn't help - that paint is dead!). Rolled it back in, stored all of the removed parts, and put the 1 full pound of nuts and bolts that were removed today in the "used bolt box".


The bumperless look isn't terrible, but we'll still cover these areas up with some smooth sheet metal - aluminum or steel

All told we pulled nearly 80 pounds out of the car today. Each aluminum bumper was 15-18 pounds each, the bumper shocks were fairly heavy, the muffler was over 10 pounds, and it just all added up. Weight is now down to 2359 lbs (that's already 15 pounds lighter than the 4 cylinder '91 318is was when fully prepped for STS), so a 2300 pound goal should be achievable. Good stuff.


We re-weighed the car for all of the doubters...

Until next time,
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