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Catalytic converter 

 

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 Post subject: Catalytic converter
Posted: Fri Sep 28, 2012 8:53 pm 
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What may i expect to find if i took apart a catalytic converter.
This is for off road purpose.
Is there any restrictions inside that would hinder performance..
Would the ECU have a problem with the exhaust gases
I only have the one converter at the moment and dont wish to take apart
Does the ford 4lt six like i free flowing exhaust system or some back pressure..
Iam restricted to the cast iron setup...
thanks
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 Post subject: Re: Catalytic converter
Posted: Fri Sep 28, 2012 10:02 pm 
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Q) What may i expect to find if i took apart a catalytic converter.
A) See Pic
Attachment:
Cat Convertor 2.jpg
Cat Convertor 2.jpg [ 57.78 KiB | Viewed 232 times ]

Q) Is there any restrictions inside that would hinder performance..
A) No

Q) Would the ECU have a problem with the exhaust gases
A) No. the only reading taken is from the O2 sensor prior to the Cat.

Q) I only have the one converter at the moment and dont wish to take apart
A) Please see above Pic.

Q) Does the ford 4lt six like i free flowing exhaust system or some back pressure.
A) Many an argument will be had over this question.
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 Post subject: Re: Catalytic converter
Posted: Fri Sep 28, 2012 10:15 pm 
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geraldo wrote:
Does the ford 4lt six like i free flowing exhaust system or some back pressure..
Iam restricted to the cast iron setup...


No engine on the planet like back pressure. Think about that. BACK PRESSURE.
that is pressure in the exhaust stopping exhaust gases from leaving the combustion chamber.

Your rules state EFI engines must use 'standard exhaust size' to extend past the driver.
Then you just put a 90degree bend on it and dump it out the side.

 

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 Post subject: Re: Catalytic converter
Posted: Sat Sep 29, 2012 10:16 pm 
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You'd be better off removing the cat completely rather then hollowing it out.
Having an open chamber like a gutted cat will impeed the exhaust gas flow and velocity.
Basically the exhaust gasses flow out in little pockets that push eachother out. If there's a large area for the gasses to expand they will get all messed up and not flow out smoothly. Very basic there.
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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 10:21 am 
Getting Side Ways
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Yes you will gain power from removing the converter and replacing it with a straight through pipe...

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 5:52 pm 
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GeZza200 wrote:
Yes you will gain power from removing the converter and replacing it with a straight through pipe...

And that power gain is neglible. It's not worth the effort for a sub 1% gain in power.

 

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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 6:56 pm 
Getting Side Ways
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its about 4-5rwkw, hes using it for offroad so im geussing it not going to be a normal everyday car. Theres no point having a cat if you dont need it.

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 8:48 pm 
Getting Side Ways
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Lol. I've seen (and experienced) 3-4rwkw losses with gutted cats, and 0.5rwkw gain from a straight pipe. Backed up with 0.1sec losses on the 1/4 and 0.01sec gains respectively. This was on a high 14 sec XR6. Surely relates closely yo a stock cast manifold equipped car.

 

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ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam.

51TER - DL LTD. Stock.

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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 8:57 pm 
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In a class with rules as tight as the one he runs in, that sort of gain is worth chasing.

 

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 Post subject: Re: Catalytic converter
Posted: Thu Oct 04, 2012 9:01 pm 
Getting Side Ways
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Ride: 98 EL Futura

Power: 199 rwkw

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67RCE wrote:
Lol. I've seen (and experienced) 3-4rwkw losses with gutted cats, and 0.5rwkw gain from a straight pipe. Backed up with 0.1sec losses on the 1/4 and 0.01sec gains respectively. This was on a high 14 sec XR6. Surely relates closely yo a stock cast manifold equipped car.


I experienced a 7rwkw gain with my 13 second NA6. They restrict power...

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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