Centrifugal Boost Question - Cats

[MontiCristo]

I am at the point where I am ready to pull the trigger and go ESS or Procharger. My local guy is very reputable and he's telling me that If i go with a centrifugal blower It will burn up the stock cats on the car. Is this true? Is there any way around this? I just want to make sure.

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[svega26]

I am at the point where I am ready to pull the trigger and go ESS or Procharger. My local guy is very reputable and he's telling me that If i go with a centrifugal blower It will burn up the stock cats on the car. Is this true? Is there any way around this? I just want to make sure.

best to just get rid of the cats, saves you the headache and thought in the back of your mind every time you make a pull.

 

[Pistol_91]

Cats are useless. If you don't have to have them, ditch them.

 

[engineermike]

I think dfso is actually what’s destroying cats. I’ve programmed mine to not enter dfso once the cats are over a certain temp. Mine have lasted several years at about 900 rwhp in both a Roush truck and Whipple car, but they are gt500 cats as well.

Speed density also does a better job of protecting the engine in the case of a cat failure.

 

[Swtbabybilly]

Depends how hard you are on the car, how hot you get them, how many back to back pulls you make, how many miles are already on them and many other things.

If you think about it the old roush cars and now whipple cars come with cats on them from the factory and they last. Im mot saying you will never have issues one day but it also not going to just melt your cats after 1 pull so it completely depends on you if you should ditch them, best of luck

 

[robvas]

Is the danger to cats different with a centrifugal vs a PD? Trying to see what the ideas are here.

 

[Bob Lob Law]

Depends how hard you are on the car, how hot you get them, how many back to back pulls you make, how many miles are already on them and many other things.

If you think about it the old roush cars and now whipple cars come with cats on them from the factory and they last. Im mot saying you will never have issues one day but it also not going to just melt your cats after 1 pull so it completely depends on you if you should ditch them, best of luck

There have been plenty of people who had cats fail on the Whipple and Roush trucks. The stock cats some people have no issues with boosted, and a bunch do.

 

[stang17]

I've been whipple from day 1 dealer install. Within 2,000 miles running stock whipple tune my cats were failing. Replaced woth kooks headers and their non green , regular high flow cats. Those lasted maybe 700-800 miles and failed quicker than the stock. This was just from daily driving on stock whipple 93 tune with the occasional merge ramp, bridge 3rd and 4th gear blast.

Ran free flow for a while but didnt like the raspy exhaust note or fumes from 93 fuel that would fumigate everything in trunk area.

Bit the $$$$ bullet and picked up GESI cats and have been trouble free for over 2 years now with plenty of 1/4 mile and roll racing days. My buddy runs GESI on his 1070whp hellcat and hasn't had any signs of failure either.

I made 786 whp SAE free flow on a dynapack and 819 whp STD on a dynojet with the GESI running same tune other than the COT protection related tables.

If you decide to go GESI cats, just be sure not to use a 2 step or no lift shift in order to keep them healthy. Also keep COT protection enabled.

You can always have them and lead pipes v banded to make swapping out of track days easier.

 

[SBR70.3]

I am at the point where I am ready to pull the trigger and go ESS or Procharger. My local guy is very reputable and he's telling me that If i go with a centrifugal blower It will burn up the stock cats on the car. Is this true? Is there any way around this? I just want to make sure.

My N=1 says yes....you will fry your stock cats. I have had the Texas Speed LT headers with their cats on for about 10k miles and have not fried them.......yet.

 

[robvas]

Only running 10psi but my 'regular' Kooks cats have held up fine.

 

[engineermike]

Is the danger to cats different with a centrifugal vs a PD? Trying to see what the ideas are here.

Couple of things:

With a centrif and the rising boost curve I would expect the “time at temp” would be lower. Also, with the rising boost curve there’s less chance of thermal shock.

Secondly, the nature of a dynamic compressor (centrif) is that increased manifold pressure will reduce flow. So if the cats clog, pressure will back up into the manifold which will reduce blower output flow. With a pd blower, it’s going to cram basically the same amount of air through whether your cats are totally clogged or not, which is directionally less safe. My Roush truck demolished the stock f150 cats. Pressure backed up into the manifold and calculated “load” went up past 2.2. But since the truck is speed density, it added fuel and took out spark due to the 2.2 load, which protected the engine.

All that said, I think just gutting the rear brick might solve most problems. The emissions stuff would still work due to the front brick, but if the front brick fails it doesn’t clog up the rear brick and cause high backpressure.

 

[robvas]

With a centrif and the rising boost curve I would expect the “time at temp” would be lower. Also, with the rising boost curve there’s less chance of thermal shock.

That would be an interesting log to see, 1/4 mile pass of each

 

[illadvised]

Mine's got about 40k miles with a paxton centri kit with stock cats and they've held up fine. Mine is a daily and I don't do any track time however. Lots of freeway miles and pulls

 

[Golgo69]

Yes, will burn up your stock cats. I could smell mine burning otw home after I picked the car up from getting the supercharger installed. That was years ago.
Since then I’ve done a whole lot, but what I did immediately after that was get kooks headers with hi flow cats. Never had any issues since.

 

[wingnutt]

Mine's got about 40k miles with a paxton centri kit with stock cats and they've held up fine. Mine is a daily and I don't do any track time however. Lots of freeway miles and pulls

ditto here with a ProCharger…but only about 25k on it thus far

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