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Racing For those that take thier Caddy's to the track

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Old 07-05-2006, 06:06 PM   #1
Dave Burden
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Default The Series 75 on tarmac (autocrossing)

Finally made it to an autocross this year with the '82 Series 75. I wasn't sure what technique would work to get the beast around all the cones. With a stock suspension and 5000lbs to move around, the one that seemed to work the best was power sliding and drifting. It was also quite fun!

You can start here to look at some pictures:

http://www.allisonf.smugmug.com/gall...795/1/79341357

They don't capture the car sideways, but you can see the need for stiffer springs and anti-sway bars. My best time was actually set with 3 passengers on board!

We made 5 runs on Sunday and I didn't go off course, nor did I hit a single cone.

Dave
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Old 07-06-2006, 06:49 AM   #2
STDog
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Cool pics. Looks like a lot of fun.

To help people find the shots...







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Old 08-21-2007, 04:59 PM   #3
Dave Burden
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Default More autocrossing pictures

Brought the Caddy back to the autocross course this past Sunday. Here are some more pictures:





We have 2 more autocrosses and 2 rallycrosses on the schedule for this year. Then I hope the winter is cold enough for some thick (18"+) ice so we can dust off the bolt tires and play on the lakes.

Dave
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Old 09-21-2007, 11:06 AM   #4
Aaron
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Default Heavy duty suspension parts...

Hey, those auto cross pictures are great! It must be worth it just to see people with their jaws hanging open wondering what the h**l you're doing!

Anyway, I thought I'd give some parts hunting pointers for anyone interested...

I've got a ton of heavy duty junkyard suspension parts bolted onto my 79 Olds 88 Coupe, and sure, it's not big as a Fleetwood 75 but the suspension parts are all interchangeable with any 77-90 full size Chev, Buick, Pontiac, Olds, or Caddy.

This means, first, that 9C1 Caprice cop parts will just bolt on. Look around for a solid 1 inch rear sway bar (the biggest available for this body, your rear end doesn't matter) and grab the springs while you're there. You can also order Caprice Police spec KYB shocks for your caddy from a suspension vendor. You won't believe the difference these shocks can make. They're AWESOME! You can cruise at 90 and it'll be rock solid, you won't even notice it. I run helper springs on my rear shocks too (the rears I got are just straight Monroe heavy duty shocks) and it firms things up a little.
Speaking of rear springs, go through your favorite junkyard with a cheap caliper and measure the diameter and count the coils of every full size 80's GM you see, the sizes vary a great deal and you may want to experiment a little with the ride and handling--the rear springs are very easy to drop, nothing in the way, they just pop right off with a compressor.
Front springs can commonly be found up to 11/16 inch on big cads and they can easily be cut (no special curls or anything like the rear springs.) The biggest springs you'll find are on the commercial Cads, they run a full 3/4 inch. I've got a pair but haven't installed them in my olds yet 'cause I haven't gotten the big block 472 in it yet. You might even have these on your 75 but I'm not sure 'cause they always wanted things so squishy for Caddys.
The front sway bar is interesting. The best bang for the buck is definitely the stock late '80's Caddy hollow 1 & 3/16 sway bar. Hit the yard with your caliper until you find one. I got one out of an '87 Brougham. They're lighter than some of the earlier solid ones (on HD suspensions across the board but the 1&1/8 bar is more common) and it's the outside diameter of the bar that resists the twisting anyway, not the middle.
Replace the frame mounts with solid if you'd like (I just put new rubber ones on & it's great) but you GOTTA hit Napa up for some solid polyurethane end links. They're only like $20, they're in stock, and that's only about 5 or 8 bucks more than the cheap rubber ones.
Lastly about the sway bar: This is a little wierd, but true.. These bars are interchangeable with 2nd gen F-Body ('70s Camaro/Firebird) sway bars. Wierd, I know, but maybe if you've got the $$ you can order yourself up a super fat 2nd gen sway bar for the front. Me, I'd be pretty hard pressed, I mean, $10-20 for the 1 3/16 hollow Cad bar versus $250-300 for a hot rod bar a little bigger... Spend it on something else!

Love the pics! Hope this helps you cure that sway...
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Old 09-21-2007, 11:15 AM   #5
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Default BTW

BTW, my Delta takes corners like it's on rails. Every now and then at night I take it up to the local empty parking lot and do figure 8s until I get sideways. It's awesome! No body roll, slight understeer, just smoking rubber!
(Just watch out for those lamp posts...)

Try some 3rd gen Camaro/Firebird 16X8 wheels & tires, too. Unless you've got a 5 on 5" bolt pattern, then maybe try to scare up some 17s off a Impala SS or something. Wheels/tires of that sort will help a lot on pavement---
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Old 09-21-2007, 07:54 PM   #6
Dave Burden
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Thanks for all the tips. I knew about the F body front sway bars, but my local junk yards don't have any and the only older Caddy they have is a '78 Coupe. There are some yards further away if I get a chance to scope them out.

There was a guy at the last autocross with a 90's Impala with an LT1 under the hood mated to a 6-speed Camaro gearbox. He suggested air bags in the rear springs. I already have Monroe shocks with coilovers so the air bags sounded good (and cheap.) As an even cheaper test I bought 8 of the rubber spring helpers that go between the coils. Figure I can install them in pairs on the rear springs and see how they work. The next autocross is this Sunday so I'll see how they help.

For wheels, I plan to stick to the 15" 5x5 for now. I guess if I can get some alloys from the 93-96 Fleetwoods I might change my mind. I like running the wire wheel hubcaps and the 15 steel wheels are cheap and easy to find. My current stock of tires for this Caddy include:

4 studded snow tires for winter use
4 Michelin rally tires for rallycrosses
4 bolt tires for ice events
6 worn out street tires for regular street and autocross use

Dave
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Old 09-23-2007, 04:49 PM   #7
Dave Burden
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Just got back from the track after today's autocross. I inserted 4 rubber blocks in each rear spring to help with sway, 2 on a coil, 2 coils per spring. These certainly did help. The inner rear tire would still spin on turns, but I could kick the tail out at will. Before the blocks, it would just burn rubber coming out of the turns. I ended up looping the limo once, but was able to control the slide the rest of the time.

Dave
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Old 10-01-2007, 01:37 PM   #8
Dave Burden
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Default quick movie of latest adventure

http://smg.photobucket.com/albums/v2...rrent=limo.flv

Dave
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Old 09-12-2009, 09:37 PM   #9
YORFATE
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Im knida new to this forum, but definately found myself right at home. Theres something for every one! I own a 1969 cad superior sovereign. A hearse of course, and this behemoth will do a full on donut from the factory. No one believes it except for the pal who broke my rear curtains. Be sure to YouTube "Donuts That Kill" someday.
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Old 09-14-2009, 05:21 AM   #10
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YORFATE, pleas post a link. I couldn't find the video in question.
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