The first run we got a good waterbox burn and Melissa staged and launched at about 3500 as she usually does at Sears. 18 psi in the et-streets, we usually run 16 at Sears. The car hooked great, the front end jerked into the sky for the first 20', (don't know if it lifted the tires off but it was very good for this car) and then bogged and fell on its face and recovered at about 80' into the run. Ran a 2.15 60'er. Next pass I had her launch at 4500 rpm, and it did the same thing with about a 2.01 60'er. The next pass I had her launch at 5500+ and it ran a 1.91 60'er (still running flat after the launch, but not falling on its face and ran a 12.85 @ almost 109 mph) Without the bog, it coulda been a mid 12 sec run. Anyway that track has big teeth and the changes that we've done to the car are working, but now we have a new problem. How do we cure the bog? The carb is a 750 holley vac sec, lightest yellow spring. I raised the rear bowl's float level to the top of the sight hole. Still no jet extensions, I'll get some this weekend! Timing is 39* at 3000 rpm, and it's a 351w w/ edel. perf. rpm heads and intake. It usually has a broad power curve, but.... It's a man. tranny. TIA We appreciate any and all tips from those that have been there and done that.

Ed, to rev the engine to 6000 only takes about 1/4 throttle so it still has a pump shot. If we go to a two step and launch with the peddle down, then the pump shot wouldn't exist. Besides the pump shot is all used up in the first 20'.

What does everyone think about secondary springs? I think they should stay wide open through the launch. But, should they? I mean should I try a tighter spring? The more I think about this I just want them to stay open and pull like a "raped ape" But if the tires don't slip, there's no convertor to slip, and something has to happen. Like the rpms dropping below the power curve, with the secondaries wide open it will bog. I'll order the extension kit on Monday from Summitt! I have a spring kit, what do you all think?!?

Thanks again,

I dug up some part numbers for you. The jet extensions are Holley part# 122-5000. Holley makes a notched float to use with them, the float part# 116-10 includes the jet extensions and part# 116-11 is the float without the extensions. Moroso also makes a notched float part# 65228. I don't have a Barry Grant part# but they also make a notched float.

Marcus, that track has serious bite! It's not a big time facility, but they do not spare the vht track bite. They sent a street car down the track to check for debris and I thought it was gonna get stuck to the track. LOL It sounded like it was driving on the sticky side of duct tape.

Give your chebbie freind our condolences. He'll probably break his p.o.s. 10 bolt rear.

I took my wife along last night and she hasn't been there since 1975 when Shirley Muldowney beat Don Garlitts in her pink dragster! Her comments were "this place hasn't changed a bit, did they stock pile a million gallons of blue paint? Cause it's even the same color!" Of course there's some dryrot on the bleacher seats....

It's still a place that caters to the racer, and doesn't seem to be as concerned with lawsuits as other tracks. You'll be able to stand right next to your buddies car while it's launching (if you want to trust the 10 bolt!)

How much "juice" are you gonna give it? It sounds like fun to me, blowing up chebbies is one of my favorite pastimes!

Thanks for the thought. We don't have a remote fuel pressure gauge, so I don't really know. It's got a Holley red pump at the tank feeding the stock line fuel line to the mechanical pump up front. Runs about 7 psi normally. Are you thinking it could be time to rear sump the tank? Or keep it full? It had about 1/3 tank of gas.

P.S.
What diameter is the fuel feed line coming up to the carb? You may benefit from installing a "fuel log" at the carb...

This is a "low budget" HS bracket car. The fuel pressure regulator is the 5/16" fuel line. LOL The line to the carb is 3/8 steel with hose connections to the 3/8" chrome dual feed line. Maybe it's time to upgrade the fuel delivery system.

Thanks for the ideas, as I'm looking through the Summit catalog. Hummmm wonder when Melissa gets paid?

I think like Mark its sloshing, bowl vents can be made from pieces of 5/16" fuel line tubing,make the front one as tall as air cleaner or hood clearance allows... i put a bend in mine facing rearward so if gas does slosh out it overshoots the rear barrels and lands behind the carb (in my enclosed airbox)

Similarly,fuel line size is not gonna be a problem until the bowls run out near 1/2 track. Even a 1/4" line will keep an unloaded engine fed at ANY RPM.

No, no black smoke, just acted like it ran out of fuel. I've got the extensions and vent tude coming from Summit. We'll try that first, then upgrade the fuel system. Wouldn't the fuel system be taxed just as hard if it didn't hook? It doesn't bog when the tires spin. (Just thinking out loud) Thanks again!