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Old 07-02-2004, 10:23 AM
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Racing question (wish we had a racing forum!!!)

Hey guys and gals-

I've decided my goal is to break my ride into the 12's (any 12, it can be 12.999 for all I care, as long as I say the car runs 12's ).

Anyway, i know a lot of you out there have the drag-racing experience that I just don't have, and I'd like your advice, criticism and help...

Many of you know I just completed the motor drop, and here's the setup:

1977 Firebird formula
Title weight: 3570
My fat *****: 220
Weight mods: Removed A/C (includes compressor (giant, heavy) condenser, and hoses). Added headers, lost the cast iron manifolds and swapped the cast iron intake for an aluminum piece. Swapped normal starter for a mini. Not running a spare or jack. Figure I saved about 150 pounds or so.

Motor: 388 chevy, 280/280 comps flat hydraulic (.480/.480 lift). 1 5/8 long tube headers, Weiand stealth intake, Dart Iron eable 2.05/1.60 heads, harland sharp roller rockers (1.5), edelbrock 600 square bore carb, HEI with module upgrade. Compression is actually kinda high, about 11:1.

Trans: Stock TH350, 2500 B&M stall

Rear: 2.73 Posi 8.5 10-bolt(don't ask me why the previous owner put this setup in!!)

I figure the car is race ready with my fat self at around 3600-3650 pounds, and I also figure my bottle necks in this setup are the gears (need a 3.73) the carb (750 needed).

How close am I to my goal? I'm figuring when i clear up my bottlenecks I'll be good to go, but its easy to be overly optimistic when its your ride!

So what else do I need to do?

Thanks in advance-

K

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Old 07-02-2004, 11:00 AM
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racing

I am not to sure about the 1/4 mile racing but to loose more weight I would remove the carpet to get rid of all the sound deadener then replace just carpet also do the same with all the plastic as there is more sound deadener behind all of it. from there the first thing that cought my eye was a lot more gear.
Jesse
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Old 07-02-2004, 11:45 AM
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Your best improvement would be the gear,as you know, and the next would be weight reduction. The carb will help after the other things are done. For every 100 lbs lost, roughly you will gain 1/10 sec.
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Old 07-02-2004, 12:05 PM
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What does it run now - how far do you have to go to see 12.99?
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Old 07-02-2004, 12:44 PM
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haven't got a baseline on it yet, haven't even fired the mill.

K
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Old 07-02-2004, 12:59 PM
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[color=gold]hell, you could be running 11's allready and not even know it. sounds like your on the right track to me. weight and gears and carb. maybe someday a shift kit?[/color]
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Old 07-02-2004, 01:18 PM
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Based on your description, you're probably only a second off the time you want.

I used to have a '68 GTO, which ran in the high 12's. It had the original 400 Pontiac motor with stock 10.5:1 pistons, a Crane cam, Holley Street Dominator manifold, 780 Holley w/vacuum secondaries and Headers. I used a TH400 trans w/shift kit and a 3.73 rear. The rear tires were 255/60's. The interesting thing about that car was....I could not spin the tires off the line. It hooked up nice. I could also run 70 MPH in first gear and it got 16 MPG on the highway with it.

You already know that you need a different gear. A 3.73 is a good gear for street/strip use. If you're only going to race it, go for a 4.11. Tire traction will be important as you don't want to spin coming of the line. The carb is somewhat of a restriction and a 750-800 CFM would help. You might also try 1.7:1 rocker arms, if the valves will avoid slapping the pistons. This will effectively increase the cam lift. With these minor changesand good driving skills, you should be there.
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Old 07-02-2004, 01:26 PM
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so you think with the current setup in in the high 13's? I could agree with that. Hope that gear and carb get me south of that in a hurry!

K
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Old 07-02-2004, 02:34 PM
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I race with a guy that has a 383-388 (stroker), Dart heads, RPM intake, 1405 (edelbrock) carb, 10.5:1 CR, etc in an 85 Cutlass with 3.73's and he runs 12.70's on the street tires. Other than the gearing his combo is quite similar to yours. Get that car of yours to the track and post up some timeslips - you may be surprised.
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Old 07-03-2004, 06:19 AM
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if you are not revving it up above 6000rpm's don't throw on anything over 700cfm carb. For the 600 you should be good up to around 5300 or so rpms. Above that you will want a bigger carb for better performance. For the stroker though that is built right, i don't see why you wouldn't be able to rev up close to 6000 rpms, so a bigger carb would be nice. And yea, get some better gears, if you still plan on driving on the street and highway, don't go for the 4.11's though in my opinion.
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Old 07-03-2004, 09:29 AM
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Quote:
Originally posted by Rhansen
I race with a guy that has a 383-388 (stroker), Dart heads, RPM intake, 1405 (edelbrock) carb, 10.5:1 CR, etc in an 85 Cutlass with 3.73's and he runs 12.70's on the street tires. Other than the gearing his combo is quite similar to yours. Get that car of yours to the track and post up some timeslips - you may be surprised.
OK, there you go, the 1405 is only a 600 cfm carb. While a 750 carb will make a little more top end horsepower it won't help you that much. People forget we race cars, not dyno's.
You know you need some more gear.
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