H/C with and without CATS Results
Thread Starter
Teching In
Joined: Nov 2002
Posts: 38
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From: CT
H/C with and without CATS Results Off road pipes 431 hp 404 tq. With cats 410 hp tq 389. I put the cats back on 2 years ago to pass emmissions. I had a check engine light so i had it re tuned . I new i was down on power because of the cats. The only thing i didn't like about the off road pipes is that after driving the car for a 1/2 hour I turned green and had watery eyes. Cats kill the smell but kill your hp numbers.
Oh well maybe i'll go back in June.
Oh well maybe i'll go back in June.
Last edited by CGLHawk260; Mar 16, 2007 at 06:23 AM.
Wow that's a big gain, 20hp. I can't wait to see what my car puts down. The #'s in my sig are w/ cats too. I know taking them out at the track gave me another .15+ and a mph.
I agree though the smell sux and after you go for a ride that's what you smell like all day.
I agree though the smell sux and after you go for a ride that's what you smell like all day.
I wonder what my car would do without the cats and just open headers...
Might have to find out this summer before the pinks allout shoot @ MIR, maybe the exhaust will find itself taking a vacation for that weekend
Might have to find out this summer before the pinks allout shoot @ MIR, maybe the exhaust will find itself taking a vacation for that weekend
Thread Starter
Teching In
Joined: Nov 2002
Posts: 38
Likes: 0
From: CT
Originally Posted by 2MCHPWR
so you are saying two years ago, with cats it made 410hp?
but now with a new tune it makes 431 with cats removed?
what brand cats? did they look clogged or collapsed?
but now with a new tune it makes 431 with cats removed?
what brand cats? did they look clogged or collapsed?
NO, I lost 20 hp by adding the CATs. 2 Years ago with NO Cats I had 431 Hp and 401 TQ ..I wish i gained!
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SLP Cats are horrible.I wonder what you would make if you ditched the SLP header and go with Kooks or QTP.We've seen 10-20rwhp gains.
Kook header Cats work very well.Ussually 5hp or so difference on a H/C car.
Kook header Cats work very well.Ussually 5hp or so difference on a H/C car.
You can't compare a car tuned without cats to just putting the cats back on without re-tuning. If you re-tuned with the cats I bet the hp loss would be closer to 5-10 hp at the most. It's like dynoing stock manifolds to headers without tuning. Why bother even dyno it.
Originally Posted by JL8Jeff
You can't compare a car tuned without cats to just putting the cats back on without re-tuning. If you re-tuned with the cats I bet the hp loss would be closer to 5-10 hp at the most. It's like dynoing stock manifolds to headers without tuning. Why bother even dyno it.
An acception was Brent's Vette which gaine 60rwhp getting rid of the Cats.But this was a 427 FI setup.
I dunno about hp, but my ta passed with a hollow cat, no tune. So cant see why a hollowed or something that appears to be a cat couldnt be added and left at that and no mess with swapping then,
Originally Posted by Slowhawk
I've done it.Some cats lose alot more than others tuned 100% back to back.Most good cats only lose 5-10rwhp.
An acception was Brent's Vette which gaine 60rwhp getting rid of the Cats.But this was a 427 FI setup.
An acception was Brent's Vette which gaine 60rwhp getting rid of the Cats.But this was a 427 FI setup.
