My mustang lost some ponys

1Slo5.0 · 02-06-2001, 10:40 AM

When i moved to colorado from Flordia the horses left my mustang seem to have lost alot of bottom end. Befor i moved to CO i swaped the upper and lower to a GT-40p 70mm throttle body and a 73 pro-m mass air. is this the real promlem? timmimg up to 18 and everything else is stock. should i put the stock upperand lower back on?

Godslayer · 02-06-2001, 10:48 AM

Don't forget that your elevation is probably much higher and will result in the motor making less power.

------------------
87 GT
Full exhaust, K&N, KB Subs, BBK STB, homeade dumps...

87 Taurus
New York
Winters Bite!

StreetStang37 · 02-06-2001, 12:43 PM

Yeah, oxygen ALOT thinner up there. That timing is kinda high I think, I see people usually advance it to 14 or so. I don't know, I can't really say anything though cuz I haven't even advanced mine yet!

------------------
1993 Mustang GT - March Ram Air, K & N filter charger, Pullies, Super Competition Hooker Headers, 2 1/2 in. mendrel bent cat back, High Flow H-Pipe, Pro 5.0 Power Tower

StreetStang37 · 02-06-2001, 12:45 PM

Oh yeah, the throttle body might be a tad big, maybe a 65 would work better. Just a guess. How does the car feel on the higher rpms.

------------------
1993 Mustang GT - March Ram Air, K & N filter charger, Pullies, Super Competition Hooker Headers, 2 1/2 in. mendrel bent cat back, High Flow H-Pipe, Pro 5.0 Power Tower

Josh91 · 02-06-2001, 03:47 PM

I can see two main problems:

1) Elevation change
2) TB is too big

------------------
1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now...

The Original GT-40P Tech Page

smooth · 02-06-2001, 04:17 PM

heh what is your elevation?

c95bluegt · 02-09-2001, 07:34 PM

Becarefull with your timing. 18 is a bit much. If you start to hear pinging in your engine, set it back to 13 or 14 because you can blow a gasket and you will mess up your heads.

Five0 · 02-09-2001, 08:44 PM

In my 91 mustang lx we ran 12 degrees timing and 93 octane gas and that is where it ran best at, with octane boost it worked best at 14 degrees timing.

That is where we got the best times at the track; and I have to agree with everybody, your throttle body is too big.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft

Five0 · 02-09-2001, 08:45 PM

BTW: that is when I was still EFI.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft

02-06-2001, 10:40 AM	#1
1Slo5.0 Registered Member Join Date: Feb 2001 Location: Colorado Springs, CO Posts: 2	My mustang lost some ponys When i moved to colorado from Flordia the horses left my mustang seem to have lost alot of bottom end. Befor i moved to CO i swaped the upper and lower to a GT-40p 70mm throttle body and a 73 pro-m mass air. is this the real promlem? timmimg up to 18 and everything else is stock. should i put the stock upperand lower back on?

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02-06-2001, 10:48 AM	#2
Godslayer Registered Member Join Date: Mar 1999 Location: Largo, FL USA Posts: 274	Don't forget that your elevation is probably much higher and will result in the motor making less power. ------------------ 87 GT Full exhaust, K&N, KB Subs, BBK STB, homeade dumps... 87 Taurus New York Winters Bite!

02-06-2001, 12:43 PM	#3
StreetStang37 Registered Member Join Date: Dec 2000 Location: San Jose, California USA Posts: 275	Yeah, oxygen ALOT thinner up there. That timing is kinda high I think, I see people usually advance it to 14 or so. I don't know, I can't really say anything though cuz I haven't even advanced mine yet! ------------------ 1993 Mustang GT - March Ram Air, K & N filter charger, Pullies, Super Competition Hooker Headers, 2 1/2 in. mendrel bent cat back, High Flow H-Pipe, Pro 5.0 Power Tower

02-06-2001, 12:45 PM	#4
StreetStang37 Registered Member Join Date: Dec 2000 Location: San Jose, California USA Posts: 275	Oh yeah, the throttle body might be a tad big, maybe a 65 would work better. Just a guess. How does the car feel on the higher rpms. ------------------ 1993 Mustang GT - March Ram Air, K & N filter charger, Pullies, Super Competition Hooker Headers, 2 1/2 in. mendrel bent cat back, High Flow H-Pipe, Pro 5.0 Power Tower

02-06-2001, 03:47 PM	#5
Josh91 Registered Member Join Date: Nov 1998 Location: Salina, KS Posts: 83	I can see two main problems: 1) Elevation change 2) TB is too big ------------------ 1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now... The Original GT-40P Tech Page

02-06-2001, 04:17 PM	#6
smooth Registered Member Join Date: Nov 1999 Location: illinois, USA Posts: 649	heh what is your elevation?

02-09-2001, 07:34 PM	#7
c95bluegt Registered Member Join Date: Jan 2001 Location: fort worth tx Posts: 9	Becarefull with your timing. 18 is a bit much. If you start to hear pinging in your engine, set it back to 13 or 14 because you can blow a gasket and you will mess up your heads.

02-09-2001, 08:44 PM	#8
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	In my 91 mustang lx we ran 12 degrees timing and 93 octane gas and that is where it ran best at, with octane boost it worked best at 14 degrees timing. That is where we got the best times at the track; and I have to agree with everybody, your throttle body is too big. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX 12.565 @109.38mph 1.764 60ft

02-09-2001, 08:45 PM	#9
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	BTW: that is when I was still EFI. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX 12.565 @109.38mph 1.764 60ft