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Author Topic:   How much quicker?
BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 05:10 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
How much quicker do you think that my car will be once I take the 2.79 open out and put in the 3.25 trac-lok? Right now I have a lot of wheel spin off the line. I know a friend with a gtp that has a supercharged 3800 in it. Needless to say I lost by a car length. My front bumper was on his rear bumper. Do you think that the gears and some traction would put me in front of him? He gives me a lot of crap and I am getting sick of it!

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 04-14-2003 05:14 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I think it will help alot.But you'll need good tires too.The trac lok helped my car alot but it still spins but at least now it's going forward.
GTP,don't they run a low 15's ?

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 05:22 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
I don't know how they run, but it is fast! I have cooper cobra 295/50/r15 tires on it right now. They have 10.8" of tread on them, so if I can get the power to both of them instead of just one, I think my traction problem would be solved. Does a supercharged GTP run 15's or is that the regular GTP?

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 04-14-2003 05:48 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
The supercharged GTP runs low 14's to high 13's I dont think the traclok and 3.25 gears will be enought for you.I'd go with 3.70 gears at least.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 05:58 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
Holy cow! If the supercharged GTP goes that fast in the quarter then my car isn't so slow, especially for the gears I have.

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 04-14-2003 06:02 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by BLstangin:
Holy cow! If the supercharged GTP goes that fast in the quarter then my car isn't so slow, especially for the gears I have.


Those times are with some mods NOT stock.Stock cars run in the high 14's.Your car should be able to run high 14's the way it is.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

[This message has been edited by Fastymz (edited 04-14-2003).]

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 06:04 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
Where do you guys think I should shift at? My cam has .448 lift on the intake, and .472 on the exhaust. Right now I shift at 6000 rpm when racing. Should that be higher, lower, or just right?

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 04-14-2003 06:07 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by BLstangin:
Where do you guys think I should shift at? My cam has .448 lift on the intake, and .472 on the exhaust. Right now I shift at 6000 rpm when racing. Should that be higher, lower, or just right?


Is that the performer cam?
I think 6000rpm is too high.I shift at 4800 most of the time,and I've tried 4000-5600rpm at the track.And shifting at 4800-5200 seemed give me the best times.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 06:13 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
I think so, I am not sure it was in there when I bought it. When I shifted at 5500 rpm instead of 5000 rpm my speedometer read about 7 mph faster.

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 04-14-2003 06:18 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
The best way to test it is at the track.
The lift of your cam is the same as mine.It's a mild cam with good lowend power.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 06:20 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
Thanks for the help Fastmyz. Anyone else have opinons on the gears? I hope that going from 2.79 to 3.25 would be enough to gain about a car length and a half in the quarter as I already have a set in another rear end that I was planning on putting in the trac-lok rear end.

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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Rory McNeil
Gearhead

Posts: 1210
From: Surrey, B.C. Canada
Registered: Nov 2000

posted 04-14-2003 06:30 PM     Click Here to See the Profile for Rory McNeil   Click Here to Email Rory McNeil     Edit/Delete Message   Reply w/Quote
That .448, .472" lift cam sounds like the same one I have in my 302 Fairmont. If so, it will be 204,214 duration @ .050. I think just about every cam company makes this grind for a SB Ford, mine is a "Blue Racer" brand.My Fairmont has a T5 with 3.55 gears, and it likes shifting 1-2,&2-3 at 5500 rpm, although it runs quicker if I short shift the 3-4 shift at 5200. This is with the early 351W heads, which give about 9.2 compression ratio. When I was using the original 78 large chamber heads,(about 8.3 compression) it worked best shifting 4800-5200 rpm.

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78 Fairmont 428 4 speed [email protected]
80 Fairmont 302 5 speed [email protected]
85 Mustang NHRA Stocker under construction, 302 5 speed
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd

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SteveLaRiviere
Administrator

Posts: 33371
From: Saco, Maine
Registered: May 99

posted 04-14-2003 06:39 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
If Pontiac's numbers are right, that GTP is a 240 hp, 3559 hp car. That be a low 15s, if my calculator is right.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-14-2003 10:29 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
I don't know much about my motor because it was already built when I bought the car, but the casting numbers on the heads are d5te-eb, which my friend's books say are 351 heads with 302 size valves and 69 cc chambers. I don't know if I have flat top pistons or dome tops, but I think they are flat tops. What would some 58 or 59 cc chamber heads do for my engine, if indeed it did have the flat tops with the 69 cc chambers right now?

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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mustangboy
Gearhead

Posts: 652
From: Ont, Canada
Registered: Mar 2002

posted 04-14-2003 11:44 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
If your buddy is only beating you by a car length I think you will have him covered after you change your gears.The posi alone will make a huge difference.Experiment on your launch technique and rpms to try to get going without bogging but with not too much wheelspin. Sometimes the adreneline gets the better of the throttle foot off the line

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1968 mustang j-code [email protected] 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-15-2003 11:24 AM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
Yep, the adreneline gets the best of the throttle off the line most of the time, but if I keep the tires from spinning the motor bogs for a while before it really takes off.

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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'69Stang
Gearhead

Posts: 180
From: Detroit, MI USA
Registered: Jan 2002

posted 04-15-2003 01:50 PM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
I think you should go with 3.50 gears at least. This will get you past that pesky GTP. Have you played with your timing at all? My 302 liked 18 degrees of intial and 36 total, made a big difference in performance.

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68DARKHORSE
Gearhead

Posts: 337
From: Austin, Tx
Registered: Aug 2002

posted 04-15-2003 02:05 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by '69Stang:
I think you should go with 3.50 gears.

I've read an article where a 3.50 t-loc in a '66 coupe picked up .4 in the 1/4.

[This message has been edited by 68DARKHORSE (edited 04-15-2003).]

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BLstangin
Gearhead

Posts: 357
From: South Central MN
Registered: Apr 2002

posted 04-15-2003 04:33 PM     Click Here to See the Profile for BLstangin   Click Here to Email BLstangin     Edit/Delete Message   Reply w/Quote
Yep, I advanced the timing until it pinged then backed it off just a little at a time until it quit pining, and yes that did make a big difference in the performance of my motor. Mission beat that pesky GTP is on!

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1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans

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