88IROC350TPI

I'm looking for some ideas to make my car consistently slower for next month's 12.0 Index race. I have almost no chance of winning since it's a very competitive field and a lot of the cars consistently hit 12.0X but it should be fun either way. How do you guys take power out of the car without causing harm to it? Not looking to spend any cash whatsoever so stuff like buying a new carb is out of the question... I'm also not looking to be one of those guys that hit the brakes at the 1000ft mark.

The car currently runs in the 11.5-11.60's @ 118-119mph with a 1.66-1.70 60ft. So I need to slow it down to a 12.0-12.1. I have a whole month to test various stuff out so give me some ideas and I'll try them

ross

Un hook the linkage and make your carb a two barrel then pull some timing out of it.And if you still need to go slower add weight in the rear (fill the gas tank)

88IROC350TPI

I was thinking of that, but I thought it may take too much power out? How much is unhooking the secondaries typically worth? The other challenge is that this is a street car that I drive an hour to the track so I need to slow it down and then be able to speed it back up as quickly as possible.

ross

I was doing this to a 380'' motor I had and could pull around .7 tenth out of it I would bracket race it set up slower beacuse its so damn hot down here. Sitting in a car with all the windows up + a jacket on and then you have an oil down.

87_TA

Make a positive throttle stop. Also in the past to slow my car I used the stock air snorkle, this would lose 3/10s for me, I also retarded the timing 8°
that was to slow car from 10.8/9s to 11.49 due to no cage at the time.
Smaller front tire will give you better reaction and less et due to loss of roll-out.

AlkyIROC

Disconnecting the secondaries may not make a huge change. Local racer tried that a few years ago and barely slowed down.

A positive throttle stop is probably the easiest. Keep the throttle from going to WOT will slow it down.

You could always put 50 pounds back into the car. Put a spare battery back up front even if it's not connected.

mexicanknight

what about a carb plate like the ones they used at nascar, its basically just a plate you put between the carb and the manifold to let less air in the motor.

1bad406

iTrader: (1)

You can always short shift the car from first into second if you manually shift. get it close then add some weight to get it closer to 12.0. If you normally shift at 6000 rpms, try 5000 that will kill it a good bit depending on your gear. You dont want it setup for 12.0 exactly anyway, setup for a 11.97 or so, that way if you happen to spin you wont be too slow. If your out in front, just barely rub the brakes to kill those extra 2 or 3 hundreths.

five7kid

iTrader: (14)

At the typical 100 lbs/tenth of a second, it's going to take a lot of weight to slow it down.

I'd start with disconnecting the carb secondaries. If that gets you most of the way, retard the timing and/or add weight.

AlkyIROC

Take a plug wire off and run on 7 cylinders.

Put a front sway bar back on.
Jet it to run really fat.

Retarding the timing and short shifting will probably have the best results. Get into high gear as fast as you can.

87_TA

I would vote against short shifting to early, you will just be introducing alot of trans heat depending what converter you use.

superbee

washer under the pedal??

Orr89RocZ

iTrader: (20)

pedal stop or throttle stop for sure!

block of wood under pedal to stop travel would work. just anchor it down so it dont get stuck under the brake

1bad406

iTrader: (1)

Short shifting will be the easiest and most consistant way of slowing it down for what he's wanting to do. When I dial my car for 7.00 it shifts right after I let go of the transbrake button and the trans temp never gets over 150, high gear clutches still look new after nearly 2 years. He wont have to shift that early, but moving it down 1,000 rpms or so won't hurt the trans at all.

car_fixer

call up those guys at joe gibbs racing, bet they can tell you how much hp those magnets were worth lol....They might be very expensive though with the fines those guys are paying lol

You could , like some have said try short shifting first, since that is free and no real work, unless you hot lap the hell out of it i dont think the trans will get too hot, but keep an eye on it. Also and adjustable throttle stop would be good too, either under the pedal or with the cable, What throttle cable mount do you have? adjustable?