Project White Turd - 1.5MPH Increase with Catback!

LXH89 · 05-03-2001, 08:16 AM

Well, its been a long time since I made a posting regarding my 246K mile motor and I ran my best time ever tonight with it. You will be surprised to see how much it picked up with a Dynomax 2.5" Catback with Super Turbos. The catback replaced a non-mandrel bent 2.25" system with 2-chamber flows.
Here's some history on this car:

1989 White LX Hatchback
302ci 246,000 mile shortblock
Ported Stock Heads retaining stock valves
GT-40 Intake (lower cleaned up a bit)
Stock MAF and Throttle Body
Stock Cam
180deg Thermostat
K&N Conical Filter
Crank Underdrive Pulley
1 5/8 Equal Shorties
2.5" Mac Prochamber
2.5" Dynomax Catback w/Super Turbos
Stock 2.73 gears
5 Speed Manual
3365lbs Weight

Previous best in car:
14.15@98.12 (2.06 60ft)
73 deg F
30.01 Barometer
45% Humidity

New Best with catback:
14.008@99.51 (2.053 60ft)
83 deg F
29.98 Barometer
60% Humidity

The car picked up nearly 1.5MPH with a damn catback!! Man, I can't wait to uncork the TB and MAF. I really think I will find another 1.5-2MPH. And with a gear and some traction, this puppy could be running low-mid 13s !!

Now I know a lot of you may be thinking, 14s under a 100mph, big woopie. A compression test revealed a highest compression of 135psi in one cylinder while the average among then was around 127psi and the lowest was 91psi. I really think this car with a fresh shortblock is capable of turning 102-103mph trap speeds with the current mods. With a fresh shortblock, I think 105-106mph isnt completely out of the question.

What's everyone else think? Am I being too optimistic here? Am I happy over nothing or is my tired shortblock performing pretty decent given the mods?

Thanks,
Tony

NO SLO PK · 05-03-2001, 10:30 AM

It's all good. Next I'd say to throw in a set of gears...you'll reduce another 3-4 tenths easily.

I can't believe the miles you have on your short block. That's a testimony to Ford's durability. From your compression test, it sounds like you'll need to freshen it up pretty soon.

------------------
Russ L
'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

dinomite · 05-03-2001, 04:50 PM

DAMN!!!!!! That is a lot of miles! with that compression test, you will need to rebuild pretty soon. My plan is to drive my shortblock till its dead, and then swap it out with a 351, that'll be a great day!

Phantom5oh · 05-03-2001, 09:32 PM

Now thats something that should make all of us proud to drive Fords, let alone Mustangs!!! I think that says something for keeping up with regular maintenance. Congrats and good luck with that beast, maybe you'll make it to 300K, but I doubt it with that poor of a showing in the compression category. I would be excited, we all need goals, and looks like you might make it.

Phantom

------------------
1983 GLX Convertible 5-Speed, knife-edged crank, internally balanced, TRW 11:1, custom cam, ported Windsor Jrs, Manley Valves, CCs roller lifters, dual springs, ARP stud kit, 600cfm Edelbrock Torker 2, Mallory Ignition, Canton 7qt traps windage tray baffles, Hooker Super Comp Headers 1 5/8 primaries 3" collectors, Flowmasters, K&N, ASP puleys, Maximum Motorsports C/Cs strut tower K member brace, through floor subframes, Grant wheel, billet pedals, 93 seats, Keystone rims

05-03-2001, 08:16 AM	#1
LXH89 Registered Member Join Date: May 2000 Location: Mt. Vernon, IL USA Posts: 12	Project White Turd - 1.5MPH Increase with Catback! Well, its been a long time since I made a posting regarding my 246K mile motor and I ran my best time ever tonight with it. You will be surprised to see how much it picked up with a Dynomax 2.5" Catback with Super Turbos. The catback replaced a non-mandrel bent 2.25" system with 2-chamber flows. Here's some history on this car: 1989 White LX Hatchback 302ci 246,000 mile shortblock Ported Stock Heads retaining stock valves GT-40 Intake (lower cleaned up a bit) Stock MAF and Throttle Body Stock Cam 180deg Thermostat K&N Conical Filter Crank Underdrive Pulley 1 5/8 Equal Shorties 2.5" Mac Prochamber 2.5" Dynomax Catback w/Super Turbos Stock 2.73 gears 5 Speed Manual 3365lbs Weight Previous best in car: 14.15@98.12 (2.06 60ft) 73 deg F 30.01 Barometer 45% Humidity New Best with catback: 14.008@99.51 (2.053 60ft) 83 deg F 29.98 Barometer 60% Humidity The car picked up nearly 1.5MPH with a damn catback!! Man, I can't wait to uncork the TB and MAF. I really think I will find another 1.5-2MPH. And with a gear and some traction, this puppy could be running low-mid 13s !! Now I know a lot of you may be thinking, 14s under a 100mph, big woopie. A compression test revealed a highest compression of 135psi in one cylinder while the average among then was around 127psi and the lowest was 91psi. I really think this car with a fresh shortblock is capable of turning 102-103mph trap speeds with the current mods. With a fresh shortblock, I think 105-106mph isnt completely out of the question. What's everyone else think? Am I being too optimistic here? Am I happy over nothing or is my tired shortblock performing pretty decent given the mods? Thanks, Tony

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05-03-2001, 10:30 AM	#2
NO SLO PK Registered Member Join Date: Mar 1999 Location: Arcadia, CA, USA Posts: 731	It's all good. Next I'd say to throw in a set of gears...you'll reduce another 3-4 tenths easily. I can't believe the miles you have on your short block. That's a testimony to Ford's durability. From your compression test, it sounds like you'll need to freshen it up pretty soon. ------------------ Russ L '91 LX Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

05-03-2001, 04:50 PM	#3
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	DAMN!!!!!! That is a lot of miles! with that compression test, you will need to rebuild pretty soon. My plan is to drive my shortblock till its dead, and then swap it out with a 351, that'll be a great day!

05-03-2001, 09:32 PM	#4
Phantom5oh Registered Member Join Date: Mar 2000 Location: Boston, MA Posts: 334	Now thats something that should make all of us proud to drive Fords, let alone Mustangs!!! I think that says something for keeping up with regular maintenance. Congrats and good luck with that beast, maybe you'll make it to 300K, but I doubt it with that poor of a showing in the compression category. I would be excited, we all need goals, and looks like you might make it. Phantom ------------------ 1983 GLX Convertible 5-Speed, knife-edged crank, internally balanced, TRW 11:1, custom cam, ported Windsor Jrs, Manley Valves, CCs roller lifters, dual springs, ARP stud kit, 600cfm Edelbrock Torker 2, Mallory Ignition, Canton 7qt traps windage tray baffles, Hooker Super Comp Headers 1 5/8 primaries 3" collectors, Flowmasters, K&N, ASP puleys, Maximum Motorsports C/Cs strut tower K member brace, through floor subframes, Grant wheel, billet pedals, 93 seats, Keystone rims