2007 Mustang GT - Loss of power in 1st and 2nd gear after taking off cats.
11/9/09, 05:23 AM
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2007 Mustang GT - Loss of power in 1st and 2nd gear after taking off cats.
I haven't started diagnosing yet as this just happened... I think i know what the problem is but it won't hurt to get a second opinion.
Got my cats sliced off last night.
This morning, 1st and 2nd gear have now power what so ever.... my boost gauge confirms as even at WOT it won't go past 0 psi. It's feels like stock.
3rd gear onwards... power comes back and boost at WOT runs normal (about 13.5 psi).
While at the exhaust shop i noticed the guy used smaller diameter pipes (much smaller) after taking off the cats. When i asked him why he said that it would be better for fitment purposes.
Could this be causing the problem? or maybe an exhaust leak?
I didn't notice last night as i wasn't giving it much throttle. It was way too loud after getting the cats removed and just sounded horrible!!
All my mods are in my signature.
The only ones i haven't put in yet are the cams, oil separator and electric water pump. (was planning on putting them in this weekend)
Got my cats sliced off last night.
This morning, 1st and 2nd gear have now power what so ever.... my boost gauge confirms as even at WOT it won't go past 0 psi. It's feels like stock.
3rd gear onwards... power comes back and boost at WOT runs normal (about 13.5 psi).
While at the exhaust shop i noticed the guy used smaller diameter pipes (much smaller) after taking off the cats. When i asked him why he said that it would be better for fitment purposes.
Could this be causing the problem? or maybe an exhaust leak?
I didn't notice last night as i wasn't giving it much throttle. It was way too loud after getting the cats removed and just sounded horrible!!
All my mods are in my signature.
The only ones i haven't put in yet are the cams, oil separator and electric water pump. (was planning on putting them in this weekend)
11/9/09, 02:34 PM
#2
Do you have an updated tune to account for the lack of cats? Where did the shop plug in the rear O2 sensors?
Smaller diameter piping with a blower is generally a pretty dumb idea anyways...that is definitely not helping. Essentially they just created even more backpressure for the exhaust, as the hot exhaust gas is already expanding in volume in the pipe, then it has to shove that same expanded volume through the smaller "cat delete" pipe.
Smaller diameter piping with a blower is generally a pretty dumb idea anyways...that is definitely not helping. Essentially they just created even more backpressure for the exhaust, as the hot exhaust gas is already expanding in volume in the pipe, then it has to shove that same expanded volume through the smaller "cat delete" pipe.
Last edited by 06GT; 11/9/09 at 02:35 PM.
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