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Author Topic: 90 LX with a cobra motor and silicate hoses  (Read 87463 times)
289nate
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« Reply #15 on: November 12, 2015, 11:05:11 pm »

Cool
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\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
David Claflin
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« Reply #16 on: December 09, 2015, 07:26:41 pm »

Just realized I made this thread almost 2 years ago and have yet to make a clean pass with this turd...
I think I got all of the issues corrected, hopefully the weather will cooperate so I can go up there this Sunday.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
thunderjet302
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« Reply #17 on: December 09, 2015, 08:19:47 pm »

Isn't the TFS box intake going to make it slower than the GT40? After all it has just a stock HO cam........... Wink
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1988 Thunderbird LX: 306, Edelbrock Performer heads, Comp Magnum 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 80mm PMAS slot MAF, 30lb injectors, FMS stainless shorties, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, subframes.
2011 Focus SE, 2012 Mustang 3.7, 2017 Honda Accord EX-L V6
Mr.Blue
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« Reply #18 on: December 10, 2015, 09:12:45 am »

Isn't the TFS box intake going to make it slower than the GT40? After all it has just a stock HO cam........... Wink

Naw, tfs box is the least of that cars problems....i'm sure the driver can slow it down just fine









J/K!
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Rodney Tolleson/VP SBFTech van club
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« Reply #19 on: December 10, 2015, 01:15:04 pm »

Isn't the TFS box intake going to make it slower than the GT40? After all it has just a stock HO cam........... Wink

Naw, tfs box is the least of that cars problems....i'm sure the driver can slow it down just fine









J/K!

His car has the same problem my car does: the driver  Grin
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1988 Thunderbird LX: 306, Edelbrock Performer heads, Comp Magnum 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 80mm PMAS slot MAF, 30lb injectors, FMS stainless shorties, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, subframes.
2011 Focus SE, 2012 Mustang 3.7, 2017 Honda Accord EX-L V6
David Claflin
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« Reply #20 on: December 14, 2015, 06:53:35 pm »

Isn't the TFS box intake going to make it slower than the GT40? After all it has just a stock HO cam........... Wink
It makes more power with the box than the Gt40. I did make it up to the track with it finally, and did make some clean passes, finally. Learned a few things, figured out I need to change a couple parts. First among them is I need to swap the cobra flywheel which weighs 13 pounds for the ford motorsport billet one I've got. The cobra one is just too light for the power level of the car, at the launch the front end comes up, it deadhooks and then as it's coming down it starts to go forward. I thought on the way home I should have gone up on the rear tire pressure to maybe get a little wheelspin, but I think the flywheel would be helpful to get it rolling.
I started out launch RPM at 3500, and worked up to 5500, and probably should have gone higher too.
60 ft: 1.611
1/8 ET: 7.75
1/8MPH: 87.50

Weather was 1300 feet above sea level, 75 degrees, 65% humidity, typical Florida "winter" day 
Next Sunday is supposed to be a little cooler, so am going to try to get that flywheel swapped this weekend. I'll make a few runs with it as is, then if Rod remembers to bring the TFS-R upper we'll swap that on and make a few more.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
Outlaw Bill
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« Reply #21 on: December 14, 2015, 07:51:59 pm »

I don't think the flywheel is the issue., leave it be.
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www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
David Claflin
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Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #22 on: December 14, 2015, 07:55:29 pm »

I don't think the flywheel is the issue., leave it be.
I know the stock HO cam isn't really good to use with the TFS-R box, but it's what I had, I wasn't going to buy a systemmaxII, or spend more money for another cam. I figured as it was stuff I had here I could use them to make some passes and learn about suspension tuning.

I kept upping the launch RPM, and tightening the front shocks, but didn't really get rid of the bog off the line.
https://youtu.be/7Bx5v_-Yaks
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
Outlaw Bill
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« Reply #23 on: December 14, 2015, 08:03:16 pm »

More tire pressure, plus might need to revisit timing and fuel.

Shit point?.
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www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
David Claflin
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 7907


Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #24 on: December 14, 2015, 08:11:16 pm »

More tire pressure, plus might need to revisit timing and fuel.

Shit point?.
I've got spark at 37 total. I'd have to look but I think fuel was in low 12's. I started out shifting at 5500, and was working my way up, fastest pass was shifting at 5800, ain't skeered to go higher. Would like to get it on dyno to see where it peaks as I'm not consistent enough yet to be able to tell difference from one run to the next.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
Outlaw Bill
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Location: Canton, Michigan

« Reply #25 on: December 14, 2015, 08:12:41 pm »

Keep shifting higher. GT-40 heads/intake with stock camshaft peaks at 5400 rpms usually, give or take 100 rpms. So about 5700-5800 rpm shift point is usually what works best. That TFS box should want more.
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www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
David Claflin
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 7907


Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #26 on: December 14, 2015, 08:48:45 pm »

That's the plan to run it higher, I've got 1.7 rockers on it, and beehive springs, so it'll go higher without any issues.
I should have put more pressure in the rears last night, might just try it again the way it is, and start out at 20 PSI in the rears.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
Outlaw Bill
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Big Block
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Posts: 4760


Location: Canton, Michigan

« Reply #27 on: December 14, 2015, 08:55:13 pm »

I'm guessing its needs more gear also.
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www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
David Claflin
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 7907


Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #28 on: December 14, 2015, 09:32:07 pm »

Has 4.30s in it, with a stock T5, 4.56s would be nice, but would need a 2.95 first trans, that's not in the cards.
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
thunderjet302
Big Block
*****
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Posts: 578


Location: Chicago, IL

« Reply #29 on: December 14, 2015, 09:35:45 pm »

Isn't the TFS box intake going to make it slower than the GT40? After all it has just a stock HO cam........... Wink
It makes more power with the box than the Gt40. I did make it up to the track with it finally, and did make some clean passes, finally. Learned a few things, figured out I need to change a couple parts. First among them is I need to swap the cobra flywheel which weighs 13 pounds for the ford motorsport billet one I've got. The cobra one is just too light for the power level of the car, at the launch the front end comes up, it deadhooks and then as it's coming down it starts to go forward. I thought on the way home I should have gone up on the rear tire pressure to maybe get a little wheelspin, but I think the flywheel would be helpful to get it rolling.
I started out launch RPM at 3500, and worked up to 5500, and probably should have gone higher too.
60 ft: 1.611
1/8 ET: 7.75
1/8MPH: 87.50

Weather was 1300 feet above sea level, 75 degrees, 65% humidity, typical Florida "winter" day 
Next Sunday is supposed to be a little cooler, so am going to try to get that flywheel swapped this weekend. I'll make a few runs with it as is, then if Rod remembers to bring the TFS-R upper we'll swap that on and make a few more.

I figured that would be the case. I'm just repeating what the "experts" on Corral say Wink.

Have you tried shifting at 6000rpm? There might be some more in it shifting higher.
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1988 Thunderbird LX: 306, Edelbrock Performer heads, Comp Magnum 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 80mm PMAS slot MAF, 30lb injectors, FMS stainless shorties, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, subframes.
2011 Focus SE, 2012 Mustang 3.7, 2017 Honda Accord EX-L V6
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