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Author Topic:   Rear Dentures
cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 12:57 AM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
Asked this on DRR & get the old I dont know much about Fords. I run a 68 Fastback with CJ iron heads on a 460, 13.50 comp, Holley 950HP alky carb, flat tappet 268*-282* @.050,.676-.688 lift, 5300 conv. 1.76 PG with a 5.43 rear, have been running a 5.43 for 15 yrs. I am thinking of going to a 5.14 or maybe a 4.88. I run 1/8 mi only. Best 60' is 1.28 with 16X32 tires, have lost a few races due to running off dial, it was all in 60' Would you change gears in the hopes of consistancy or leave it alone? Which gear? Been launching with 3600 chip, shift at 5800 cross line at 6700. Runs within .01-.02 till track gets hot, then a .04 off out of nowhere.

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BAD COMPANY TILL THE DAY I DIE!!!!!

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Dave_C
Gearhead

Posts: 744
From: Gadsden, Al
Registered: Aug 99

posted 12-21-2002 08:44 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
I don't think you would see much difference with a 5.14. I would go with the 4.88. They also make a 5.00 that might be just about right. You are shifting at 5800 so I think you need something that puts you closer to 6000 at the stripe vs 6700.

The 5.00 or 4.88 would hit the tires easier and help the consistency as well as drop your finish line rpm.

BTW, how loose is your converter? My 69 Mustang had (sold it this fall and bought a dragster) a 1.76 glide, 15X32's's and 5.43 gears. I had a stroker 383W. Left at 3100, shifted at 6700, but only crossed the line at 6400. If you are having a higher finish line rpm, perhaps your converter is a little loose. My converter stalled 5400 on the brake.

Later,
David Cole

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-21-2002 09:22 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
What compound tires you running? Sounds like what my car would do when it had the soft compound tires on it. It would 60' within .005 all day unless the track was hot, then the 60' would be off by as much as .03 from pass to pass. I now have a medium compound tire and the 60's are consistent no matter what the track temp is.

But, changing to a little taller gear should help your car do what you are wanting. But, I have seen guys with torquey motors put a taller gear in and go faster while still getting the same 60' times. One friend went from a 5.38 to a 4.88 and the car ran exactly the same et but with more mph.

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 02:24 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
The conv. is a 5300, & it stalls 5300 on T brake.Every run is 107 mph plus or minus a few hun. wind, etc. could affect it that much. I have used GY, Hoosier, Stones of different compounds & settled on MT stiff sidewalls, they are more consistant in 60' more than the others. They have put me in more finals than all the others combined. The tracks I run at are extremly competitive in that you better run dead on with a five O light or you are gone, especially after 4th rnd. I went to PG to help with wheelies (18 in high)different launch methods & RPMs, different shock valving on front, diff tie downs etc.got it now to 6 to 8 in. Car has stock type front end, backhalved rear with ladder bars,there is no obvious tire spin, it just shows on time slip. EX. one run (down to 4 cars)had been running 6.00-6.01, dialed a 6.00, had a 517 light to his 528,mid track times & stripe mph almost identical to prev. runs, he ran a 619 on a 619 to my 6.04 on 6.00, this happens with way too much frequency. So most of you think a 4.88? that is what Im thing, just wanted some more voices of experience. Anyhing else you can add? Thanks all, Bob Carr

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-21-2002 03:54 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
It seems almost everywhere you go now days that Top ET (delay box) class is that tuff. I try to shoot for a .515 or better, and dial it "on" every pass.

Am I understanding this right? Your car runs 6 ohs, but only at 107 mph? Or was that a typo? The reason I ask is, my car runs mid 6.20's, but I'm running almost 110 mph (a touch over 1009 generally), and I use a c4 trans so my mph is generally slower than 'glide equiped cars. Is your fuel system big enough for the alky carb? I assume it is since you are obviously successful, but I figured it wouldnt hurt to ask.

This doesnt relate to your qquestion but, I really loved my stiff sidewalled Hoosiers, but only in the spring and in the fall. They were a soft compound, and during the heat of the day in the summer, they would spin, but as soon as the sun would go down and the track would cool off a bit, my 60' would pick up a ton.

Which hole are you running the ladderbars in? Sounds like your suspension works pretty good, but my opinion is that something in the car is "off" somewhere just a little bit.

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 04:27 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
KV The track this time slip was from is only 600' Your times were on a full eighth. If mine were on a 660', sounds like they would be close. I moved the ladder bar brackets upward to gain a little more hit/separation. They are almost level now, seem to work best there. Car lifts wheels every pass,goes straight, no pull whatsoever, should be 100% hook. Have used tape/string on coilovers, they are not extending to limit of travel. The cam was ground to my specs to take away bottom end & add to mid & top, it helped a lot & made car faster. I know from weighing car that rear percentage is off (54 front 46 rear) & that is with 8 in engine setback. I know if I had a tube chassis it would help, but due to health prob., that is out of the question. Im thinking a gear change might cure my ills. But you know yourself its hard to slow down, to quote "Faster horses, older whiskey,younger women & more money"
PS probably the biggest off you spoke of on this car is between the steering wheel & the seat LOL
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BAD COMPANY TILL THE DAY I DIE!!!!!

[This message has been edited by cracing (edited 12-21-2002).]

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-21-2002 05:26 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 cracing:
PS probably the biggest off you spoke of on this car is between the steering wheel & the seat LOL


LOL My car has that same exact problem too!

It is hard to slow down. I have actually been kicking aroud the idea of putting together a lower compression, flat tappet cam, 2v headed motor for my car that should run around 6.80's. But, I kinda like going fast with the wheels up.

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jsracingbbf
Gearhead

Posts: 1677
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 12-21-2002 06:30 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Bob, Which track is this at? Fulton, byhalia? I have to dail my car up for the right hand lane at Byhalia. Also, what does your car weigh? I run 4.56 gears in mine and it used to weigh 2700lbs with my big butt in it. It may weigh a tad less now with the tubular A arms. Unless your car is real heavy I wouldn't think you would need that much gear. I am wondering if the convertor is too loose also. Mine stalls at 4500 rpm. I had to change it when I switched to the BBF. Kenny re-worked it from a 5800 rpm stall, set-up for a 351C.

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Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car

"This is FORD Country, on a quiet night you can hear a chevy RUST!"

"A self assured person can be perceived as arrogant by someone who is pulling their radio flyer full of self doubt."

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 07:42 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
It was at Fulton Jerry, the last time I ran there. My car weighs 3075# with me in it. I dont have near the motor you have either. Kenny & me came up with this 5300 conv. when I changed to a PG. But if you have a 4.56 & yours is lighter with more motor, a 4.88 or 5.00 should be close for mine. Although you brought up another consideration,that being, if I do go 4.88 will it drop my rpm range down into conv. slippage? HMMMM? things to ponder. Dont want to get into too many changes, hopefully just one. Hey K.V. were you around the Ala. Nats. in Steele in 94 & 95? If you were that was me wrenching on the 67 Fastback running in Pro Mod.

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-21-2002 08:18 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
No I wasnt. I just moved to NC from Iowa a couple of months back. Until then, the farthest I had been to race was Topeka, KS and Indianapolis.

As for convertor slippage, I was always told you should shift at least 1000 rpm over your stall speed to insure the convertor was locked up on the gear change.

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Dave_C
Gearhead

Posts: 744
From: Gadsden, Al
Registered: Aug 99

posted 12-21-2002 10:07 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 cracing:
were you around the Ala. Nats. in Steele in 94 & 95? If you were that was me wrenching on the 67 Fastback running in Pro Mod.

I remember the car. It was a cool ride. I was impressed with it. The car was holding it's own against big $$$$ operations.

Steele is my home track. Only live 15 minutes away.

Wish the track owners would play nice with the IHRA and get our National Event back.

Later,
David Cole

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 11:32 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
It was a single 4 bbl 632 running against Scotty Cannon, Tommy Mauny, Shannon Jenkins amoung others. Won Drag Review Editors choice at Bristol. Lance Johnson from Columbus Miss. was owner/driver. Best run at that event was 7.01 @ 192 mph, burned 2 pistons at 1,000 ft on that run. Those times were when I found out the hard way that I wanted nothing more to do with Pro Mod. Too much work & pulling car around, no fun time or BS time! Lance wrecked the car at Steele the next year at Steele in a fast eight show. Car was totaled. Sold Lenco,clutch & rear to Earnest Jones, engine to some guy in Canada,remains of chassis traded to Jerry Rasberry for work on Late Model dirt car.

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-21-2002 11:44 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
Hey buncha thanks to all of you, Dave C, KV, & Jerry for taking time with an old man & his dreams. I think Im going with the 4.88 & see what happens.Maybe it wont put too much strain on this HRA PG. Hope I can see some of you at the races! BTW Fulton Dragway will run its final race this Sunday with a Footbrake only show, He will reopen 2nd week in Jan.

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BAD COMPANY TILL THE DAY I DIE!!!!!

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Dave_C
Gearhead

Posts: 744
From: Gadsden, Al
Registered: Aug 99

posted 12-22-2002 08:36 AM     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 cracing:
Lance wrecked the car at Steele the next year at Steele in a fast eight show. Car was totaled.

Hated to see it wrecked. I was there that night. Saw the wreck. Looked at the car later when they got it back to the pits. It was a mess.

Later,
David Cole

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 12-22-2002 11:19 AM     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 cracing:
Hope I can see some of you at the races!

Maybe we can pick a weekend next summer where a bunch of us can get together and race. Maybe find someplace "in the middle" or close to it.

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cracing
Journeyman

Posts: 55
From: Saltillo Miss. USA
Registered: Jan 2002

posted 12-22-2002 12:34 PM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
Well you know how it will turn out, Most Sundays Mine will be the only Ford in Pro,but if there is another one or two or a Mopar for that matter, you can bet we will run each other!

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BAD COMPANY TILL THE DAY I DIE!!!!!

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