I have a 93 with headers, exhaust, cold air intake and a dinan chip. Would I gain any hp by removing the converters...if so how much, and how much weight would I lose. Please spare me the green peace speeches!!! Also, how much louder could I expect the exhaust note to be?
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Catalytic converter removal, hp gains??
- Thread starter Steve
- Start date
Quoting from the FAQ:
"Does Removing Or Bypassing The Catalytic Converter Help?
Removing the cats on an NSX yields no practical performance benefits. I configured my Supertrapp muffler as a straight through with no silencer disks and the torque was miserable below 6000 rpm, less than stock, which proves that messing with the muffler alone will give you all the back pressure reduction that is beneficial."
"Does Removing Or Bypassing The Catalytic Converter Help?
Removing the cats on an NSX yields no practical performance benefits. I configured my Supertrapp muffler as a straight through with no silencer disks and the torque was miserable below 6000 rpm, less than stock, which proves that messing with the muffler alone will give you all the back pressure reduction that is beneficial."
benefit or not, I think you'll save some weight.
- Joined
- 11 June 2001
- Messages
- 124
About exactly how much weight will be saved? I'm thinking of doing the same with my car. I just recently took off all the heat shields for the cats and the exhaust hoping that it would save a little bit of weight.
[This message has been edited by NSX36 (edited 02 May 2002).]
[This message has been edited by NSX36 (edited 02 May 2002).]
NSX36
becareful when removing the heat shield from the exhaust. This can mean the heat transfer better to your trunk. Check your tool foam, make sure it doesn't get cooked.
becareful when removing the heat shield from the exhaust. This can mean the heat transfer better to your trunk. Check your tool foam, make sure it doesn't get cooked.
- Joined
- 11 June 2001
- Messages
- 124
Thanks, I wasn't aware that might happen. I'm gonna check right now! BTW, I didn't remove the heat shield off of the muffler, just the ones on the cats and on the pipes leading to the muffler. It looked too hard to take off the shield for the muffler so I just left it like it was
Perhaps you bought your cat bypass pipes from Placebo Racing?
I agree totally with NSXHK, I feel the same differences with my Comptech cat bypass pipes... and the exhaust's sound is louder too.
The weight's gain is 7 kg
David
The weight's gain is 7 kg
David
- Joined
- 11 June 2001
- Messages
- 124
I'm thinking about getting the Comptech bypass pipes for my '93 NSX. Is there anything I need to know before I install them? Or is it a true plug-and-play installation? I mean, do I just take off my cats and replace them with the pipes and off I go?
Just installed the Taitec by-pass Pipes for a track event this weekend and Holy Crap is this LOUD!!! I have DC Headers and the RM Racing DTM Exhaust I cant believe it Nasty sounding is all I can say.
Steven 91 Blk/Ivory
Steven 91 Blk/Ivory
The cats with heat shields weigh 22 lbs. The heat shields probably make up less than 10% of this figure, so removing them is not worth the risk.
Cat bypass pipes weigh between 3 and 6 lbs, depending on material and model year.
Originally posted by nsxtasy:
Perhaps you bought your cat bypass pipes from Placebo Racing?
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Andrew Henderson
The NSX Model List Page
"We have long acknowledged that enthusiasm for things automotive is a sure
sign of emotional instability if not outright dementia" - Brock Yates
I got 15hp by taking out the cats.....but, that alone won't do it...I had to add fuel to make the power
If you've added fuel but you're claiming a gain from removing the cats, you really don't know that the cats had anything to do with the gain... Or did you measure after removing the cats but before adding fuel? What was the increase? Changing two things and attributing the increase to one or both without verification is fundamentally flawed.
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Andrew Henderson
The NSX Model List Page
"We have long acknowledged that enthusiasm for things automotive is a sure
sign of emotional instability if not outright dementia" - Brock Yates
To the person with the cryptic sig;If you added more fuel then by the gods of stoiciometry you must be adding more air too.That means you are talking about a forced induction motor and I would agree that in that instance you could make more power with cat removal but for an NA motor like mine it does ugatz for power.
With the stock NSX, you may have to add fuel to make power, but doing so will give you 270 more hp than trying it without fuel.
whatever....
yea..ok...whatever
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