Does hitting rev limiter damage cats??? - MustangForums.com



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Old 02-28-2013, 05:03 PM   #1  
2009 Eleanor
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Default Does hitting rev limiter damage cats???

When I speed shift, sometimes I will hit the rev limiter. Does hitting the rev limiter and dumping extra fuel down the pipes damage the cats?
Has anybody had a similar experience where there cats where damaged from rev limiter?

I am thinking about getting an o/r x pipe to replace my stock h pipe and then just swap back when I need to go through emissions.
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Old 02-28-2013, 05:18 PM   #2  
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Interesting.

I thought the rev limiter cut both spark and fuel, not just spark alone. Any effect would be minimal as that's what the cat is for is to burn off excess fuel, I mean % wise how much or u hitting the limiter compared to time spent not at the limiter? <0.00001%
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Old 02-28-2013, 07:31 PM   #3  
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If it does, my cats are trashed. I've hit the rev limiter on quite a few occasions.
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Old 02-28-2013, 07:41 PM   #4  
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Quote:
Originally Posted by Nuke View Post
If it does, my cats are trashed. I've hit the rev limiter on quite a few occasions.
Nice to know!
I speed shift everytime I take the car out and hit the limiter often enough where I had to ask. But apparently no one else has had a problem which is a good thing!
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Old 03-01-2013, 02:07 AM   #5  
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I cooked my stock cats after a couple seasons of drag racing, but that was with boost.
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Old 03-01-2013, 03:03 AM   #6  
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Stock cats are really tough. I was down a cylinder, WOT a few times and mine are still fine. I even removed the H-pipe to be sure.

I hooked my shop vac to the H-pipe, you'd be amazed at how much actual air can flow through the cats.

[img]http://www.pbase.com/paulyoly/image/96783639.jpg[\img]
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Old 03-01-2013, 03:50 AM   #7  
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i thought our cars cut fuel.
atleast thats what i always heard when people put in FI they tune off the TC
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Old 03-01-2013, 10:45 AM   #8  
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Quote:
Originally Posted by Lem-06 View Post
i thought our cars cut fuel.
atleast thats what i always heard when people put in FI they tune off the TC
Traction control actually closes the throttle body I believe. I can't remember what I was doing, but I had my rear wheels off the ground and was trying to give it gas. The more I pressed the gas pedal, the lower the rpms went until it finally died. TC overrides your foot.
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