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Don't laugh but....I want to build a Subaru bracket racer!
Posted 29 July 2003 - 01:12 PM
My son and I have been talking about something motorsports-wise to get involved in next. I got to thinking maybe we should build this old hatch into a bracket drag racer. I told him that in bracket racing, a car doesn't have to be fast, just consistent. I used to have a 5.0 Mustang that I took to the drags on occasion, and I remember how the slowest cars usually ended up winning because it's easier to get consistent runs out of them. I'm thinking I'll just leave the automatic in it, but rebuild the engine and tranny so we know they'll work good, and go through the rest of the car so we know that it's good mechanically. I see our local drag strip runs an import class, so we've got a place relatively close to home to run it. I've already got a trailer big enough to haul it on, so we don't have to worry about getting home if we break something. It might be kind of a fun father/son type project this winter.
I would like to know if anybody else is doing something like this with a Subaru, and if you have any advice for us?
Posted 29 July 2003 - 01:25 PM
1. have some fun
2. don't brake out
3. practice practice practice
Posted 29 July 2003 - 02:35 PM
Might want to stock up on CV's if you get the slicks, though.
Regards and have fun,
Posted 29 July 2003 - 06:03 PM
Should be fun
Posted 29 July 2003 - 09:23 PM
I'm thinking 13" wheels; short tires = low gearing. I'll need all the help I can get in that department. Can't lighten the flywheel, there isn't one on an automatic. Besides, for drag racing you want a heavy flywheel, it helps the launch. I'll have to research the piston deal some more. Can the heads be milled any? I'd like to get up in the 10/11 to 1 compression area. Will an EA82 manifold bolt up to this engine? I understand they're better flow. I plan on cleaning up the ports. Oh, if you install a Weber, what do you do with the huge mass of hoses on the engine now?
This is getting really interesting now!
Posted 29 July 2003 - 11:48 PM
That is a direct quote from a ea81 performance page.
<a href="http://www.ultimatesubaru.org/80s/ea-performance-page/subaru-ea-performance.html" target="top">The Subaru EA Performance Page</a>
there is some other stuff on there.
Posted 30 July 2003 - 02:56 AM
Posted 31 July 2003 - 04:46 AM
Now I got a few questions:
crimefyter: Are the 1600 pistons a direct bolt in? I looked up the specs and an 1800 is about .300" longer stroke than a 1600. If everything alse is the same, that would put the pistons well up into the heads! Maybe the wrist pins heights are different? It sounds like a great idea, but I need a little more info. Is there a web site that explains it better?
Adam N.D.J.: Do you really think a stock hatch will run in the 17s? I used to have a Honda CRX, and I know that a GL hatch wouldn't come close to that car. You're right about the Honda times, they were pretty much in the 16 to 17 second range. I'm thinking that some engine work will be in order, which is fine. I can't stand to leave stuff bone stock! I know that fast isn't a necessity, but I want to go fast enough to make it fun.
Thank you for your support!
Posted 31 July 2003 - 12:25 PM
1600 pistons (from what I've read here) are a drop-in. Don't know if anyone's really checked to see what the final CR is, but seems to be 9.5 or 10 to 1. Mill the heads a little, but remember that if you take too much off, it throws off the valvetrain geometry and you will have to modify the intake manifold to compensate for the shorter distance between the heads. If you do a complete rebuild, make sure everything's nicely ballanced in there. If you don't go for the regrind, call up CCR for a Brat cam - supposed to give you better torque.
Strip out the interior, or at least the rear, and definitely put good stiff shocks in the rear. The lower weight in the rear, combined with stiff new shocks, will reduce weight transfer to the rear, giving you better traction and a better launch.
PS: On the EA-81's the distributors are different than on the EA-82's - so the EA performance page notes don't necessarily apply here. I have the actual advance curves for the different EA-71 and -81 distributors somewhere if anyone is interested.
Posted 31 July 2003 - 03:40 PM
Posted 31 July 2003 - 07:41 PM
Posted 31 July 2003 - 11:39 PM
i'll use EA 81 with 4spd D/R, the thing will be flying on 14" pegout rims, i won't do any modes to the engine becouse the whole thing would be like most 1000 lbs. thats preaty good for the EA 81 hp,.....good luck with youre drag racing
1989 DL Wagon 5spd D/R with LSD
1984 GL Sedan RWD
1982 DL Sedan 4WD
Posted 01 August 2003 - 12:23 AM
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