L-89 TUNING TIPS. . . HELP

[justin_18_ky]

the gear is a 3.73, with an m-21 trans

it'll be running on the stock bias-ply, they hook up pretty good actually. . . but i dunno about the class, but the most stock possible, this is totally unaltered, and doesn't use bent rules. just a stock car ready to run, hoping for about 14.00-14.10 at 102-103. .maybe with a little better traction it'll be running 13.90's at 103 or so. . .

[Chevy454]

The "Certified Stock" tech is something new they added this year, to try and quiet a few rumblings about some cars. It involves a thorough inspection of the car, and an engine tear down, and then the engine components are checked. All cars, certified stock or not, all run against each other and are matched up by ETs. So, there really aren't different "classes" so to speak, just some cars are going through a tear down.

Which tires are you running...Firestone or Goodyear? Also, what tire pressure?

[justin_18_ky]

the tires are firestone wide oval . . . i think they work best on the street with higher pressure. . . the more the better until about 40 psi or so. . . . these are really old age bias ply tires too, not new tech. they still sway and find grooves just as original. hehe

the positraction unit works like a dream, it hooks up really good, leaves perfectly equal black marks like a locker or spooler would. . .

[Chevy454]

If your tires are very old, a change to a "newer" bias-ply repro tire would probably help you. After the tires experience so many heat cycles, the rubber in them goes to crap. Pete can attest to this as his '70 COPO Nova has NOS Polyglass tires on it, and he said they were pretty much useless when compared to the "newer" repro Polyglass.

On our Camaro, we are running around 44 psi in the rear, and about 46 psi in the front. The key is to make sure your black marks are even all the way across, which means your tires aren't cupping or overinflated. Pumping the fronts up is supposed to decrease rolling resistance.

It's not just the "old" Polyglass tires that are a little wild on the road. Our repros do the same thing...I guess it's just the nature of the beast!

[Steven J]

If your car doesn't pull well past 5000, and the carburetor and distributor are set up and tuned correctly, you may want to check to see if you have enough fuel pressure, or you might be in need of new valve springs.

[Chevy454]

I have also heard that if you wire your coil backwards the top end will go away. Of course that's just what I heard...