No power

dah · November 12th, 2011, 11:04 PM

Hey guys i recently built a motor for my 91 gt. The bottom end is stock it has gt40p heads, explorer intake, lt headers, 70mm throttle body, 24lb injectors, 1.7rr, and a e303 cam. The car isnt running much faster than it did with the factory motor. I talked with a mechanic and he said the throttle body might be to large so i tried my factory one and it didnt change much. Any suggestions on how to make it faster with what i have would be greatly appreciated thanks in advance

ryanw · November 12th, 2011, 11:20 PM

do you have a matching mass air flow sensor calibrated to the 24lb injectors ? What is your timming set at ?

dah · November 12th, 2011, 11:27 PM

yes its a c&l 76mm and timing is at 14

Chris951 · November 12th, 2011, 11:34 PM

Fuel pressure? Were the heads rebuilt? Worn out heads/valve springs will make a very big difference in performance. My last fox had over 200k on the motor and i swappeud the heads out for some fresh rebuilt e7's and it picked up ALOT of power. Just a suggestion.

dah · November 12th, 2011, 11:58 PM

idk about the fuel pressure but the guy i bought the heads from said he rebuilt them, he said they were trick flow springs but i dont no how to tell

brought_pain · November 13th, 2011, 10:54 AM

What about the fuel rails? Are they from the old setup? Check those for obstructions.

How much faster is it? That combo should be close to 300hp vs stock 225.

Check the fuel lines too, maybe change the filter...

I've seen some kind of Goo/gum stuff that plugs filters. I got a lot of it out of an inline can and seen it in a clear, see through filter. The stuff seems to not get pushed through even though its liquid like. It doesn't break down in gas either.

ryanw · November 13th, 2011, 11:14 AM

C&l maff meters are known to have problems. that would be the last brand of maff id ever use. im not playing, they suck, Try putting your stock maff and 19lb injectors back in, to see if it gets better

gripthenboost · November 13th, 2011, 07:40 PM

When you mean its not much faster? What difference did u feel at all? Thats a nice peppy combo. With your combo you should be running alot better up top around 60-120. Are you running stock exhaust and cat?

dah · November 13th, 2011, 08:36 PM

The fuel rails are stock. ill have to check them out when i swap back to the 19lb injectors and stock mass air. As far as power its alittle better than stock but not anywhere close to what i would have thought. the exhaust is bbk longtubes and a o/r x pipe.

ryanw · November 13th, 2011, 08:47 PM

check your fuel pressure, it should be 39 psi with vacuum line blocked off/ engine running, and for the hell of it check your codes, it only takes 5 min to do

dah · November 13th, 2011, 09:14 PM

could the o2 sensors have anything to do with the low power? i just remembered the guy who helped me put the motor in didnt plug them in because the wires were to short.

ryanw · November 13th, 2011, 09:28 PM

get those o2 sensors pluged in

November 12th, 2011, 11:04 PM	#1
dah Regular 1991 mustang gt Join Date: Jan 2011 Posts: 51 iTrader: 0 reviews	No power Hey guys i recently built a motor for my 91 gt. The bottom end is stock it has gt40p heads, explorer intake, lt headers, 70mm throttle body, 24lb injectors, 1.7rr, and a e303 cam. The car isnt running much faster than it did with the factory motor. I talked with a mechanic and he said the throttle body might be to large so i tried my factory one and it didnt change much. Any suggestions on how to make it faster with what i have would be greatly appreciated thanks in advance

November 12th, 2011, 11:20 PM	#2
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	do you have a matching mass air flow sensor calibrated to the 24lb injectors ? What is your timming set at ? __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 13th, 2011, 10:54 AM	#6
brought_pain Enthusiast Join Date: Aug 2010 Location: Utah Posts: 701 iTrader: 0 reviews	What about the fuel rails? Are they from the old setup? Check those for obstructions. How much faster is it? That combo should be close to 300hp vs stock 225. Check the fuel lines too, maybe change the filter... I've seen some kind of Goo/gum stuff that plugs filters. I got a lot of it out of an inline can and seen it in a clear, see through filter. The stuff seems to not get pushed through even though its liquid like. It doesn't break down in gas either. Last edited by brought_pain; November 13th, 2011 at 11:09 AM.

November 13th, 2011, 11:14 AM	#7
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	C&l maff meters are known to have problems. that would be the last brand of maff id ever use. im not playing, they suck, Try putting your stock maff and 19lb injectors back in, to see if it gets better __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 13th, 2011, 07:40 PM	#8
gripthenboost Hardcore Enthusiast 91 Mustang GT 1991 sliver GT Join Date: Apr 2010 Location: New York Posts: 1,213 iTrader: 0 reviews	When you mean its not much faster? What difference did u feel at all? Thats a nice peppy combo. With your combo you should be running alot better up top around 60-120. Are you running stock exhaust and cat? __________________

November 12th, 2011, 11:27 PM	#3
dah Regular 1991 mustang gt Join Date: Jan 2011 Posts: 51 iTrader: 0 reviews	yes its a c&l 76mm and timing is at 14

November 12th, 2011, 11:34 PM	#4
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Fuel pressure? Were the heads rebuilt? Worn out heads/valve springs will make a very big difference in performance. My last fox had over 200k on the motor and i swappeud the heads out for some fresh rebuilt e7's and it picked up ALOT of power. Just a suggestion.

November 12th, 2011, 11:58 PM	#5
dah Regular 1991 mustang gt Join Date: Jan 2011 Posts: 51 iTrader: 0 reviews	idk about the fuel pressure but the guy i bought the heads from said he rebuilt them, he said they were trick flow springs but i dont no how to tell

November 13th, 2011, 08:36 PM	#9
dah Regular 1991 mustang gt Join Date: Jan 2011 Posts: 51 iTrader: 0 reviews	The fuel rails are stock. ill have to check them out when i swap back to the 19lb injectors and stock mass air. As far as power its alittle better than stock but not anywhere close to what i would have thought. the exhaust is bbk longtubes and a o/r x pipe.

November 13th, 2011, 08:47 PM	#10
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	check your fuel pressure, it should be 39 psi with vacuum line blocked off/ engine running, and for the hell of it check your codes, it only takes 5 min to do __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 13th, 2011, 09:14 PM	#11
dah Regular 1991 mustang gt Join Date: Jan 2011 Posts: 51 iTrader: 0 reviews	could the o2 sensors have anything to do with the low power? i just remembered the guy who helped me put the motor in didnt plug them in because the wires were to short.

November 13th, 2011, 09:28 PM	#12
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	get those o2 sensors pluged in __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

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