Estimated 1/4 with Motorsport 351/5-speed combo

[Brute]

Estimated 1/4 time with Motorsport 351/5-speed/3.50:1 combo

Mustang-lovers:

I'm wondering how quick the following car might be in the quarter-mile. It is a 1980 Mustang hatchback, running the Ford Motorsport 351ci engine (385hp/377 ft-lbs torque, current part number M-6007-A351R). It runs a Holley 750 dual-feed carb, has full-length headers, true dual exhaust, coupled to a Motorsport T-5 trans, and a 9" posi rear with 3.50:1 gears. Chassis-wise the car is stock, except for subframe connectors and different front springs to cope with the additional weight of the 351. How quick do you think this car will be with drag radials and a decent driver behind the wheel?

 

[powershift351]

low-mid 13's

 

[T_5.0_N'works]

low-mid 13's

I run a low to mid 13 with about 100hp and lbs less than that.

You would def be in the mid 12's with a very good launch. I'd say with slicks very high 11's.

Did the 1980 hatch come with a 9'' rear? If not you really don't need one, they suck up a lot of power.

 

[powershift351]

thats flywheel hp there,and ford over advertises the HP there, tq is pretty accurate, but the true rwhp on the block is around 330-340(no block is the same). I used to have the same block, and the bottom end didnt hold together, so now I got a built dart winsor. Re-enforce the bottom end with a girdle and windage tray, and a canton pan wouldnt hurt either. I have a built 351w and I run a 12.38, and a 12.08 with meats. I will give you low 13's. If I could do it over again, I would re-enforce the bottom end of that Ford 351w

 

[T_5.0_N'works]

Well I disagree, oh well. I still say 12's.

 

[Brute]

Estimated 1/4 time for 351/5-speed/3.50 geared 1980 Mustang

Fellas:

Thanks for the input. Someone else pointed me toward a 1/4 mile time estimator on Prestage.com. Let me show what it predicted, and let me know if this makes sense.

Weight of 1980 Mustang: 2606lbs (Encyclopedia of American Cars, 2001)
Additional weight of 351: 50lbs (http://www.team.net/sol/tech/engine.html)
Additional weight of scattershield:48lbs
Addional weight of other mods: 80lbs
Weight of driver: 190lbs
Total race weight: 2974lbs

RWHP = 327 (385hp X 85%)

Prestage predicts a time of 12.15 @ 112mph.

Now, I did a sense check of two vehicles I am very familiar with. One weighted 4700 lbs and had 260rwhp, and ran 15.35 @ 89 mph consistently with myself behind the wheel. Prestage predicted 15.27 @ 89mph. My buddy has a 2003 Corvette automatic that runs a consistent 13.4 @ 105 mph, and Prestage predicted (using a 3450 race weight) a time of 13.2 @ 103 mph.

However, I'm sceptical this Mustang will REALLY be that fast. Anyone have dyno data on the 351/385hp engine?

 

[Brute]

TTT. We'll see if anyone else has a new opinion on this. How fast would you expect it to run on street radials? On slicks? I'm afraid I would tear up the transmission if I ran slicks...

 

[stock50LX]

thats flywheel hp there,and ford over advertises the HP there, tq is pretty accurate, but the true rwhp on the block is around 330-340(no block is the same). I used to have the same block, and the bottom end didnt hold together, so now I got a built dart winsor. Re-enforce the bottom end with a girdle and windage tray, and a canton pan wouldnt hurt either. I have a built 351w and I run a 12.38, and a 12.08 with meats. I will give you low 13's. If I could do it over again, I would re-enforce the bottom end of that Ford 351w

I am running that cam in my EFI 351. My best is a 12.36 on DR's using Edelbrock heads. The best with ported Ford iron heads was 12.55. What is the compression on that engine? I am running stock pistons, so my current compression with the Edls (60cc heads) is about 9.3 to 1.

 

[JimBowy]

Fellas:

Thanks for the input. Someone else pointed me toward a 1/4 mile time estimator on Prestage.com. Let me show what it predicted, and let me know if this makes sense.

Weight of 1980 Mustang: 2606lbs (Encyclopedia of American Cars, 2001)
Additional weight of 351: 50lbs (http://www.team.net/sol/tech/engine.html)
Additional weight of scattershield:48lbs
Addional weight of other mods: 80lbs
Weight of driver: 190lbs
Total race weight: 2974lbs

RWHP = 327 (385hp X 85%)

Prestage predicts a time of 12.15 @ 112mph.

Now, I did a sense check of two vehicles I am very familiar with. One weighted 4700 lbs and had 260rwhp, and ran 15.35 @ 89 mph consistently with myself behind the wheel. Prestage predicted 15.27 @ 89mph. My buddy has a 2003 Corvette automatic that runs a consistent 13.4 @ 105 mph, and Prestage predicted (using a 3450 race weight) a time of 13.2 @ 103 mph.

However, I'm sceptical this Mustang will REALLY be that fast. Anyone have dyno data on the 351/385hp engine?

well if you want to know for sure, go out to Milan or Norwalk the next test and tune night.... stop guessing!

 

[speedracer238]

well if you want to know for sure, go out to Milan or Norwalk the next test and tune night.... stop guessing!

I'm with JimBowy.....just don't run at Lapeer or u wont hook up and you'll slide around and just get pist off

 

[stock50LX]

Mustang-lovers:

I'm wondering how quick the following car might be in the quarter-mile. It is a 1980 Mustang hatchback, running the Ford Motorsport 351ci engine (385hp/377 ft-lbs torque, current part number M-6007-A351R). It runs a Holley 750 dual-feed carb, has full-length headers, true dual exhaust, coupled to a Motorsport T-5 trans, and a 9" posi rear with 3.50:1 gears. Chassis-wise the car is stock, except for subframe connectors and different front springs to cope with the additional weight of the 351. How quick do you think this car will be with drag radials and a decent driver behind the wheel?

What is the compression on that engine?

 

[Brute]

I should have included the head specs. Ford iron castings, ported, polished and pocketed by Andy Konya. 1.94" intake /1.60" exhaust valves. 9.5:1 compression. Technically, the engine is not the SVO crate engine, but has the same cam and compression as the SVO engine. I guess a LOT of headwork was done to the factory castings, so I'm estimating it to be in the same ballpark to the SVO 351 power-wise. It revs very quickly, and runs strong (from the one drive I took it on).

I do not own this car, which is why I have not been able to find out firsthand what it would run. I know the guy who is selling it and I am thinking about adding it to my "stable", but only if it is faster than my daily-driver Corvette...

Also, the early Body style has the sleeper factor!

 

[stock50LX]

I should have included the head specs. Ford iron castings, ported, polished and pocketed by Andy Konya. 1.94" intake /1.60" exhaust valves. 9.5:1 compression. Technically, the engine is not the SVO crate engine, but has the same cam and compression as the SVO engine. I guess a LOT of headwork was done to the factory castings, so I'm estimating it to be in the same ballpark to the SVO 351 power-wise. It revs very quickly, and runs strong (from the one drive I took it on).

I do not own this car, which is why I have not been able to find out firsthand what it would run. I know the guy who is selling it and I am thinking about adding it to my "stable", but only if it is faster than my daily-driver Corvette...

Also, the early Body style has the sleeper factor!

Are these C90E castings?

How fast is your Corvette?

You know that the performance of the same combo can vary substantially, and much depends on the headwork you are describing. With that in mind, and based on your criteria for buying the car, you could tell the seller to take the car to the track and if it runs _______ you'll buy it. You should go to the track with him. You have many tracks in Mich, right? All this should be done after you've agreed on the price, of course.