High-Flow Catalytic Converters

Birdie2000

Birdie2000

Club Member
What kind of power losses typically are seen through the newer high-flow catalytic converters? I've heard that the losses are actually pretty minimal if you buy decent ones.
 
id also like to know, i think im going to install a couple this year.

anyone know if they are all "pretty much" equal? Ive seen the compact bullet style ones on ebay for about $40.
 
They aren't restrictive. But aggresive camshaft profiles tend to cuase them to overheat becuase of the oxygen and fuel wash of large camshafts. If it is for a near stock engine give me the camspec and I will let you know if the cats can tolerate it.
 
Sean said:
If it is for a near stock engine give me the camspec and I will let you know if the cats can tolerate it.
Click to expand...

TFS stage 1 cam on a blown 302
Duration @ .050" (degrees) - 221 intake/225 exhaust

Cam Lift (intake/exhaust) - .312"/.319"

Lift w/ 1.6 rocker (intake/exhaust) - .499"/.510"

Lobe seperation (degrees) - 112

what 3" cat (very small size) will work?

thanks
 
That borderline. I would look into a MetalCat from Arvin Meritor.

avbcon12 said:
TFS stage 1 cam on a blown 302
Duration @ .050" (degrees) - 221 intake/225 exhaust

Cam Lift (intake/exhaust) - .312"/.319"

Lift w/ 1.6 rocker (intake/exhaust) - .499"/.510"

Lobe seperation (degrees) - 112

what 3" cat (very small size) will work?

thanks
Click to expand...
 
this is just the forum i need because spraying my car has destroyed my cat and i was going to put in a bullet style high flow soon but not to sure what i want to do yet
 
so just go with no cat at all? because right now i have no muffler just straight pipe so maybe take out the cat and do a muffler to tone it down
 
Generally the high flow cats use a metallic substrate vs. the ceramic used in the factory cats. Ceramic cats fundamentally have a higher pressure loss as the wall thickness is thicker; using a metallic substrate will significantly decrease the wall thickness of the substrate resulting in a lower pressure loss across the converter. They all will have the limitation of heat..get them too hot and they melt! Melting them depends on more than just where you put them and how hot the exhaust gets; the flow distribution across the face of the substrate is what counts. In general, the aftermarket cats have poor cone design which leads to poor distribution across the face of the substrate leading to hot spots and then failure. If its designed correctly and the tune up is on there is no reason it will fail. This of course assumes you are using a "pump" fuel..adding alcohol or lead will just coat the brick and cause a bunch of backpressure which in turn leads to heat buildup and failure.
 
I'll stick with my O/R pipes. I have my factory ones with the cats laying around in case I ever have emissions done but other than that I don't know why you'd want to put on cats since people like stealing them. That and the problems with them going bad.
 
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