HP loss with HF Cat
HP loss with HF Cat
DynoFlash,
How much average do you see HP loss with a HF cat over a testpipe, considering a 3" exhaust from the turbo back?
Anyone have any dyno's? Im debating putting on my 3" HF cat (Magnaflow) to quiet down my car, but I don't want it to feel slow.
BTW, I searched, but couldn't find anything concrete except that you said with the 3" UR HF cat, you didn't lose even 1 hp here:
https://www.evolutionm.net/forums/sh...ad.php?t=55371
the UR HF cat uses the magnaflow converter, right? Why did you say you gained low end?
Thanks for the input.
How much average do you see HP loss with a HF cat over a testpipe, considering a 3" exhaust from the turbo back?
Anyone have any dyno's? Im debating putting on my 3" HF cat (Magnaflow) to quiet down my car, but I don't want it to feel slow.
BTW, I searched, but couldn't find anything concrete except that you said with the 3" UR HF cat, you didn't lose even 1 hp here:
https://www.evolutionm.net/forums/sh...ad.php?t=55371
the UR HF cat uses the magnaflow converter, right? Why did you say you gained low end?
Thanks for the input.
Last edited by bo0oost; Jan 13, 2005 at 03:10 PM.
You would probably loose about 10 hp max. That is the stock cat. I saw a dyno comparison and it was 10 hp between stock cat and test pipe. With a high flow maybe only 5 who knows? Not that much hp would be lost. I will get one if I ever need to smog test.
UR high flow cat is almost like cat delete pipe, I heard they smell as bad as a test pipe. If you are considering a HF cat, I would go with APS HF cat or Magnaflow or Works (which actually has resinator in it)
Originally Posted by Evo23IG
UR high flow cat is almost like cat delete pipe, I heard they smell as bad as a test pipe. If you are considering a HF cat, I would go with APS HF cat or Magnaflow or Works (which actually has resinator in it)
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lots of dyno tests on this...search the evo/turbo section. Documented loss's from a high flow to a test pipe err i mean vice versa is about 12-15whp 12-20lbt tq......its a huge difference!
Originally Posted by chapter8
lots of dyno tests on this...search the evo/turbo section. Documented loss's from a high flow to a test pipe err i mean vice versa is about 12-15whp 12-20lbt tq......its a huge difference!
If you don't adjust the boost controller for the cat then there is going to be more difference than if you compare at a constant level of boost.
One thing to keep in mind is that a cat can hurt spool-up even if the max HP isn't too different.
One thing to keep in mind is that a cat can hurt spool-up even if the max HP isn't too different.
Originally Posted by Evo23IG
UR high flow cat is almost like cat delete pipe, I heard they smell as bad as a test pipe. If you are considering a HF cat, I would go with APS HF cat or Magnaflow or Works (which actually has resinator in it)
I have the UR higflowcat on my evo and it smells like my stock cat did. Where did you hear that is smells as bad as a test pipe???
If you asked me, i'd say the main difference is OVERALL horsepower, not peak, I think peak ends up pretty close, but the flow is more even with cat-delete, and there seems to be a lot less turbo-lag as well, other than that....it feels the same once it hits hard