Why is my car so slow?

da89cup · 06-11-2001, 02:06 AM

I'm running a 351W with a 9" K&N cone, 80mm MAF, 70mm tb, GT40 lower, Cobra upper, stock 5.0 heads, long tube Hedmans (1-5/8), no cats, 2.5" H-pipe, Dynomax race bullets, & 4" tips, 2.73s, 190lph pump, 30lb injectors, I bought the car with most of this stuff done to it allready, it has some kind of cam but I don't know what it is, my car idles @ 1000rpm, & I don't see a chip plugged into the computer so I'm still running the stock computer with the 5.8L. My best run was 14.665 @ 95.9 mph, my reaction time was .523. I hear of all these guys running almost stock Mustangs & they're getting low 14s. With all these mods, my car is damn slow. I know that if I get heads & gears, my car will just fly. I found a set of BBC heads bare for $1200 canadian. I'm not too familiar with BBC, can anyone give me some advice on these heads. If I get heads & 3.73s, what kind of numbers could I expect in the 1/4.

thanks

crewzin · 06-11-2001, 02:52 AM

Get ride of those gears! When I went from the 273s to 355s I cut 3/4 of a second off my time.

Skyman · 06-11-2001, 03:38 AM

Well there is more than one problem with your car. Everything is completely mismiatched.

Do you know what kind of 351w you have? Is it a roller block? What compression ratio, it could be an older low compression 351. The stock heads are killing you on that big a motor. 4" Tips are unncessary, and the 2.73's are crap. The 30lb injectors are wayy to big and making your car go very rich I'm sure. Probalby the biggest source of your low power. Not to mention if the cam you have doesn't match your stock heads. Also what is your timing at?

Go with a set of TW heads, fine out about your short block and cam. Do your research before you mod your car, as the person that had it before you didn't.

Good luck...

Skyler

------------------
-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
50-175 Nitrous Works WET Kit just added.

Dark Knight · 06-11-2001, 05:51 AM

BBC usually means big block chevy...

------------------
84 convt,'95 302,AFR's, performer
3.55's, underdrives stock shorties
stock cam, 1.7's
14.06@100.21, 255RWHP on a hot day
265 on the mph/weight chart

Stang Runner · 06-11-2001, 04:58 PM

Man it has to be more than just the gears I have 2.73 and get 96-99 MPH with about the same ET.

------------------
1988 LX 5.0
Drivetrain: 2.73 Stock Gears, World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack
Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks
Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles
Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\back

exgmguy · 06-11-2001, 06:16 PM

I think Pep Boys sells Mr. Gasket adapter plates to use those BBC heads though....

Not only do you have a lot of the wrong parts, your car is probably horribly out of tune. You should have someone that really knows Mustangs look at it.

Problem is, every idiot will tell you they know the best way to tune it......hhhmmmmm. I would say pick the brain of someone going fast in a Mustang at the track. Most people are really helpful.

------------------
1988 Mustang GT
12.0 @ 122
1992 BadAzz Wrangler
1993 Explorer

06-11-2001, 02:06 AM	#1
da89cup Registered Member Join Date: Feb 2001 Location: edmonton, alberta, canada Posts: 55	Why is my car so slow? I'm running a 351W with a 9" K&N cone, 80mm MAF, 70mm tb, GT40 lower, Cobra upper, stock 5.0 heads, long tube Hedmans (1-5/8), no cats, 2.5" H-pipe, Dynomax race bullets, & 4" tips, 2.73s, 190lph pump, 30lb injectors, I bought the car with most of this stuff done to it allready, it has some kind of cam but I don't know what it is, my car idles @ 1000rpm, & I don't see a chip plugged into the computer so I'm still running the stock computer with the 5.8L. My best run was 14.665 @ 95.9 mph, my reaction time was .523. I hear of all these guys running almost stock Mustangs & they're getting low 14s. With all these mods, my car is damn slow. I know that if I get heads & gears, my car will just fly. I found a set of BBC heads bare for $1200 canadian. I'm not too familiar with BBC, can anyone give me some advice on these heads. If I get heads & 3.73s, what kind of numbers could I expect in the 1/4. thanks

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06-11-2001, 02:52 AM	#2
crewzin Registered Member Join Date: May 2001 Location: Sour Lake, TX Posts: 211	Get ride of those gears! When I went from the 273s to 355s I cut 3/4 of a second off my time.

06-11-2001, 03:38 AM	#3
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Well there is more than one problem with your car. Everything is completely mismiatched. Do you know what kind of 351w you have? Is it a roller block? What compression ratio, it could be an older low compression 351. The stock heads are killing you on that big a motor. 4" Tips are unncessary, and the 2.73's are crap. The 30lb injectors are wayy to big and making your car go very rich I'm sure. Probalby the biggest source of your low power. Not to mention if the cam you have doesn't match your stock heads. Also what is your timing at? Go with a set of TW heads, fine out about your short block and cam. Do your research before you mod your car, as the person that had it before you didn't. Good luck... Skyler ------------------ -1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows. 12.55@107mph 50-175 Nitrous Works WET Kit just added.

06-11-2001, 05:51 AM	#4
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	BBC usually means big block chevy... ------------------ 84 convt,'95 302,AFR's, performer 3.55's, underdrives stock shorties stock cam, 1.7's 14.06@100.21, 255RWHP on a hot day 265 on the mph/weight chart

06-11-2001, 04:58 PM	#5
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	Man it has to be more than just the gears I have 2.73 and get 96-99 MPH with about the same ET. ------------------ 1988 LX 5.0 Drivetrain: 2.73 Stock Gears, World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\back

06-11-2001, 06:16 PM	#6
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	I think Pep Boys sells Mr. Gasket adapter plates to use those BBC heads though.... Not only do you have a lot of the wrong parts, your car is probably horribly out of tune. You should have someone that really knows Mustangs look at it. Problem is, every idiot will tell you they know the best way to tune it......hhhmmmmm. I would say pick the brain of someone going fast in a Mustang at the track. Most people are really helpful. ------------------ 1988 Mustang GT 12.0 @ 122 1992 BadAzz Wrangler 1993 Explorer