1st run
1.78(Spun)
7.511
95.93
ET Streets 15psi, shocks 2 left/3 right, shifted at 7000

2nd run
1.687
7.379
95.95
13.5 psi, 3/4, 6500

3rd run
1.683
7.343
96.53
13 psi, 3/3, 6500

I made 4 runs but I had a brain cramp on the first run and forgot to turn the fuel pump on, ha ha. Just a little info since my last time at the track I've added 6-point cage, moved battery to the back, electric fan, rancho shocks. Any help would be greatly appreciated!!!! See ya!!

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James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.39 @ 96MPH 1/8
1.66 60'

[This message has been edited by 67Coupster (edited 03-16-2002).]

quote:

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Originally posted by chips67:
is the rear too stiff making the car do this? steve'66 was talking about having the same problem and i think he said it was too stiff but i cant remember what he did to fix it.

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No I really don't think it's too stiff. With the rear shocks set on full loose I can compress it pretty easy.

quote:

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Originally posted by capri man:

you probably are not uncovering your rear jets that quick unless the float is set way to low. this usually happens a little further down the track. do you have a plastic vent tube connected to the bowl vent tubes. sometimes gas will slosh out of the front one and the raw gas falls right back into the front of the carb causing a stumble. also do you have 90/10 or something close front shocks? sometimes the front shocks will actually pull the front end down to early causing the weight to transfer back to the front of the car, making it start spinning again.
onr more thing. what size slicks do you run and how much does your car weigh? ok everyone get ready to call me crazy but, i run MT 10X26X15 et drags. my car weighs 3050 with my fat a$$ in it. i get the best 60 ft times with around 20 lbs of pressure in the slicks. good luck
where is fortson ga?

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No I don't have a hose connecting the vent tubes. Good idea I'll try that next time. I do have 90/10's on the front. For tires I have MT ET Streets that are 28 by 12.5(10" actually). Not sure what the car weighs. If I had to guess with me in it 3100 to 3200 lbs. I've heard the ET Streets like around 15 psi, but mine last night seemed to like around 13. I know this car should have the 60' in the low 1.50's and I think I have the mph(96) to be running 7.0's if I can only get it to hook better. Oh well I'm trying.

Fortson is just outside Columbus. I've been running at Phenix City Dragway. I hear they now have the concrete poured at the new dragstrip there building in Lagrange, GA. Haven't seen it but it's susposed to be a all concrete 1/4 track. About 25 miles down to road from me. Can't wait!! Thanks for input!!!!

I've got fairly stiff springs on the back of my car, and the shocks need set of full soft. With a really soft drag race leaf spring, the shocks could be set stiffer. The bouncing taking off is usually associated with a rear suspension that is too stiff. Soften it up however you can, and try again.

Good Luck!

quote:

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Originally posted by kid vishus:
I would put jet extensions on it for sure. And it will uncover them almost right away. Plus, I would seriously consider removing the rear power valve and bumping up the rear jet size to compansate for the change. Because if it is uncovering the jets, it is also uncovering the powervalve and they dont make an extension for it.

Plus, the hook, spin, unhook sounds like the rear shocks are too stiff to me. I would try a pass or two with the shocks on full soft. I run mine there when the traction isnt very good. You can also try putting a little weight in the trunk (50 lbs as far back as you can get it) to slow down the shock speed a little.

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If I go with a power valve plug what size jets would be a good starting point, currently have 78/81 jets. I'll try the shocks on full loose next time and see what happens. Thanks!!

quote:

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Originally posted by capri man:
since you run the et-streets, im assuming that you drive your car on the street some. if so, have you considered getting a spare set of wheels and mounting slicks on them so you can just change when you get to the track. i got a couple of sets of used slicks that you could try and a couple of 8in wheels, but the wheels are 4 bolt mustang. have you ever ran in albany? i live only 20 minutes from the track there.
keep us posted on the progress of the lagrange track. thanks

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Haven't been to Albany before, not even sure where it's at. Have to break out the map. Appreciate the offer to try out the slicks. Have a friend with some 28 by 10.5 ET drags that I might try.

I'll let ya know when the Lagrange track opens up. Later!!

quote:

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Originally posted by n2oMike:
A friend of mine with a 406 Chevelle went from 1.7 60fts to 1.5 60fts with jet extensions. I use the screw-in type, as they are much more secure. Be sure to get a notched float. You may also have to jet up the rear a size or two to compensate for the extensions.

I've got fairly stiff springs on the back of my car, and the shocks need set of full soft. With a really soft drag race leaf spring, the shocks could be set stiffer. The bouncing taking off is usually associated with a rear suspension that is too stiff. Soften it up however you can, and try again.

Good Luck!

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Who sells the screw in type jet extensions. I haven't seen them in the Summit or Jegs mags.

quote:

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Originally posted by RPM289:
COOL James, I wish I would have made it out
to watch. Talk to ya later.

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Hey boy, missed ya last night. Wasn't that many people out there last night. Calvin came to watch I think he said one of his starter bolts broke when was going to load the car up. I'll try and call ya tonight. See ya!!

quote:

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Originally posted by 67Coupster:
Who sells the screw in type jet extensions. I haven't seen them in the Summit or Jegs mags.

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Jegs sells them. Holley screw in xtensions, part number 510-122-5000.....they are $6.69 per pair.

quote:

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Originally posted by Kyle:
Summit part number HLY-116-10 is the complete kit made by Holley- extensions and float. $17.95.

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That looks like the way to go! I can get the power valve plug locally. Thanks!!!

He said I needed to slow down the body separation by setting my shocks on 4 or 5 and put two clamps on the rear of each of the leaf springs. He thinks the separation is happening so fast that it is causing the weight to come off the rear tires and letting it spin. He wants the separation to occur farther down the track to keep as much weight on the rearend as possible early in the run.

Made a lot of sense to me. I think maybe what I was feeling was the weight coming back down and the tires biting again and pulling hard. Oh well I installed the jet extensions and power valve plug anyway. I will let everyone know how it does. See Ya!!!

quote:

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Originally posted by 67Coupster:
Just got off the phone with Travis at Caltrac .... He said I needed to slow down the body separation by setting my shocks on 4 or 5 and put two clamps on the rear of each of the leaf springs.

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Before I backhalfed my car that was exactly the way I had my 69 setup. I had the Cal-Tracs and Ranchos. Had the Rancho's on 4. Had the leaf springs clamped onthe rear. Had about a bazillion people tell me I had the clamps in the wrong place, but it worked. The Cal-Tracs keep the front of the spring straight, the clamps keep the rear together. Makes it act like a really stiff monoleaf spring.

Later,

It's TOUGH getting a small tired nitrous injected 4-speed to launch well at the track... especially when the track is marginal.

Good Luck!