Catted downpipe Max BHP ?

[Adrian]

Does anyone have any idea of the maximum power levels with a catted downpipe such as the Active Autowerkes downpipe?

Active Autowerkes say:

The GESi UHO-Series Catalytic Converters are rated for engines putting out between 500 and 850 horsepower while maintaining a high flow capacity.

What is the most people are running with high flow cat instead of catless?

Thanks

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[Supra Jr.]

Does anyone have any idea of the maximum power levels with a catted downpipe such as the Active Autowerkes downpipe?

Active Autowerkes say:

The GESi UHO-Series Catalytic Converters are rated for engines putting out between 500 and 850 horsepower while maintaining a high flow capacity.

What is the most people are running with high flow cat instead of catless?

Thanks

Great question having the same downpipe on my car, but I don't feel like anyone on this site could really answer that question with anything but an opinion. Unless of course they had the same downpipe an ran it until failure and possibly badly cripple their engine. Again you'll just get opinions which really don't matter.

 

[bushido]

i don't know about "max", but:

mikeybotti ECUTEK tune, AA DP, intake
484whp/575wtq

i had a picture of the graph, but the numbers i saw & that he verbally told me do not match the picture.. so i pretend it doesn't exist

edit: i did tell him i was worried about the transmission (because i thought i was going to make more tq, but that's when i learned the AA DP is a restrictive DP, not high flow as users on here claim lol) so i don't know if he made it less aggressive or not. i doubt it though

edit: and E50*

 

[Adrian]

That’s more torque than I make now with my mods and catless downpipe so that’s good to know.

 

[Sub-MkV]

I think the reason Catless DP's make more power than catted has to do with boost creep/overboost.

Stock my peak boost is 15-15.5 psi

with Catless DP it's 16.5 psi

With a piggyback with +3 psi, I saw 22.8 psi!!!

 

[Extreme Power House]

the power is dependant mostly on the cat, as you mentioned in your post, the active autowerke will handle up to 850whp
Unfortunately, most brands do not reveal which cat they are using, so it's tough to know.

 

[razorlab]

I was using a GESI cat on my last car with 640whp without issue. I have seen V8's with two GESI cats put down 800-900whp

KIES uses four cats on their F80 that put down 1000whp.

The "you can't make power with cats" thing is an internet myth that people like to parrot.

 

[Supra Jr.]

i don't know about "max", but:

mikeybotti ECUTEK tune, AA DP, intake
484whp/575wtq

i had a picture of the graph, but the numbers i saw & that he verbally told me do not match the picture.. so i pretend it doesn't exist

edit: i did tell him i was worried about the transmission (because i thought i was going to make more tq, but that's when i learned the AA DP is a restrictive DP, not high flow as users on here claim lol) so i don't know if he made it less aggressive or not. i doubt it though

With those numbers you have to be on E blend

 

[Adrian]

This is reassuring. Thanks for the input all. It is widely stated the only option is decat.
Im not really looking to exceed 600 whp. Just picked up an Active Autowerks catted downpipe and look forward to seeing how it compares to decat which I don’t like.

 

[bushido]

With those numbers you have to be on E blend

i thought i mentioned it. sorry! correct, E50

 

[Supra Jr.]

This is reassuring. Thanks for the input all. It is widely stated the only option is decat.
Im not really looking to exceed 600 whp. Just picked up an Active Autowerks catted downpipe and look forward to seeing how it compares to decat which I don’t like.

What didn't you like about decat???

 

[D3ad_Hand]

If I'm not wrong MST claims their catted down pipe has no CEL and can hold up to 1000hp. I still think AA is better, but idk I didn't see anyone use it. @Extreme Power House Can you provide some info I saw it on your website.

Thanks

 

[ColonelAdama]

I think the reason Catless DP's make more power than catted has to do with boost creep/overboost.

Stock my peak boost is 15-15.5 psi

with Catless DP it's 16.5 psi

With a piggyback with +3 psi, I saw 22.8 psi!!!

Can someone explain this phenomenon? I don't understand how going catless can change your boost level. Boost is read at the charge pipe and the closed loop feedback system shouldn't be affected by turbine-side back pressure.

something to do with wastegate calibration?


Unrelated, but this whole "going AA to avoid CEL" is kind of silly. There are several options for no CEL, both catted and catless. See Function werk and Armytrix. Besides that, just use an O2 spacer/defouler on the post-cat sensor on any other downpipe causing CEL. (No cel for 60k miles on my GTI with 200 cell cat)

Just use a little common sense to understand that the vendors here want you to go AA since they sell it, and its a premium product with premium margins. Dropping $1500 to go from a stock cat (800 cell?)to 400 cell is just ?‍. Don't hit me with the "but you spent 60k on the car" bs either lol

 

[BuyFastParts]

Have constantly attained 700+ at wheel on Dynojet Dyno with AA catted downpipe and using Ecutek

 

[razorlab]

Can someone explain this phenomenon? I don't understand how going catless can change your boost level. Boost is read at the charge pipe and the closed loop feedback system shouldn't be affected by turbine-side back pressure.

something to do with wastegate calibration?


Unrelated, but this whole "going AA to avoid CEL" is kind of silly. There are several options for no CEL, both catted and catless. See Function werk and Armytrix. Besides that, just use an O2 spacer/defouler on the post-cat sensor on any other downpipe causing CEL. (No cel for 60k miles on my GTI with 200 cell cat)

Just use a little common sense to understand that the vendors here want you to go AA since they sell it, and its a premium product with premium margins. Dropping $1500 to go from a stock cat (800 cell?)to 400 cell is just ?‍. Don't hit me with the "but you spent 60k on the car" bs either lol

The ECU is torque/load target based, not PSI target. PSI level can change day to day, hour to hour.

There are some tables in the ECU that basically shows pressure loss in the exhaust system. If you don't tweak those tables after taking the cat out or adding a free flowing exhaust, the boost can raise.

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