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Author Topic:   60'
67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 07:56 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Went back to track last night and beat my personel best 1/8 mile time twice. The only thing is my 60' time didn't improve any actually it was a little worse. I moved my rear tire psi around some and changed rear shock settings but it didn't really seem to change much. On the last run I think I noticed what was going on, let me know if sounds like it could be the problem. I'm launching at 5000rpm, the second I dump the clutch the car really bites hard then it doesn't bog but it feels like the motors not accelerating cleanly. Then about two to five feet out it really pulls hard. I have a stock holley 850dp. It has a power valve and no jet extensions in the rear. Could I be uncovering these during launch causing it unload the rear suspension? It hooks spins hooks. It's the only thing I could think of since tire pressure and shock setting don't really have much affect. I'm also moving the left tire on the rim each run about a 1/2". I'll trying loosening up the right shock some more next time out. Here are the times I run last night:

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!!

------------------
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).]

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

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chips67
Gearhead

Posts: 663
From: louisville, ky, usa
Registered: Jul 2001

posted 03-16-2002 08:32 AM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
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.

------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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capri man
Gearhead

Posts: 7611
From: doerun, ga.
Registered: Nov 2000

posted 03-16-2002 11:06 AM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote

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?

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 11:27 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
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.


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

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

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 11:38 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
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?


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!!!!

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

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-16-2002 12:42 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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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capri man
Gearhead

Posts: 7611
From: doerun, ga.
Registered: Nov 2000

posted 03-16-2002 01:02 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
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

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.

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RPM289
Gearhead

Posts: 155
From: Phenix City, AL
Registered: Feb 2002

posted 03-16-2002 02:24 PM     Click Here to See the Profile for RPM289   Click Here to Email RPM289     Edit/Delete Message   Reply w/Quote
COOL James, I wish I would have made it out
to watch. Talk to ya later.

------------------
66' Mustang
95' Lightning
84' 351w Ranger

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 03-16-2002 02:31 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
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!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 05:03 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
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.


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!!

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

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 05:06 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
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


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!!

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

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 05:09 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
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!


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

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

IP: Logged

67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-16-2002 05:12 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by RPM289:
COOL James, I wish I would have made it out
to watch. Talk to ya later.


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!!

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

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-16-2002 05:42 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 67Coupster:
Who sells the screw in type jet extensions. I haven't seen them in the Summit or Jegs mags.



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

Or,
Moroso screw in extensions, part number 710-65440..they are $11.99 a pair.

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Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 03-17-2002 01:36 AM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
Summit part number HLY-116-10 is the complete kit made by Holley- extensions and float. $17.95.

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-17-2002 08:03 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Kyle:
Summit part number HLY-116-10 is the complete kit made by Holley- extensions and float. $17.95.

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

------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.34 @ 96MPH 1/8
1.66 60'

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 03-21-2002 04:44 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Just got off the phone with Travis at Caltrac and wanted to pass along a few tips he gave me. I described to him what my car was doing and this was his suggestion.

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!!!

------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.34 @ 96MPH 1/8
1.66 60'

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Dave_C
Gearhead

Posts: 1069
From: Gadsden, Al
Registered: Aug 99

posted 03-21-2002 05:06 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
quote:
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.

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,

David Cole

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 03-21-2002 06:12 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
I tried to set mine up like that, but launching on the bottle would just make the tires spin as the whole back of the car bounced down the track. A softer suspension would absorb more of that initial shock.... Of course, a softer setting on the clutch would accomplish pretty much the same thing.

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!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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