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Registered:
August 2002
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turbo cat convertor
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Wed, 13 November 2002 21:35
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Im currently doing some work to my ma70 supra, and have taken the cat converter off. Iv been told that if i gutted the convertor hollow it will give better fuel economy and performance, but ive also been told that turbo cars need the back pressure to operate properly. What is fact and what is fiction?
BTW my car is a turbo.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: turbo cat convertor
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Wed, 13 November 2002 22:30
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If you took a dump before driving your car you would get better economy and performance than gutting the cat converter!
And you dont need the back pressure because you have a turbo!!
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Location:
Adelaide
Registered:
May 2002
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Re: turbo cat convertor
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Thu, 14 November 2002 04:09
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Turbo Cars need back pressure: Horse-shit, Backpressure in a turbo car is bad. In fact backpressure in any car is not good.
Also todays Highflow cats dont lose very little power over an equivalent straignt pipe at all, so compared to the fines if your bodgy tactic was discovered it's better to just invest in a decent high-flow cat.
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Location:
Ipswich
Registered:
July 2002
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Re: turbo cat convertor
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Thu, 14 November 2002 06:56
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Actually backflow in any car can be benificial if setup correctly. When the backpressure causes the right pulsing in the airflow it can actually extract more gas from the engine than no backflow at all.
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Registered:
August 2002
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Re: turbo cat convertor
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Fri, 15 November 2002 00:48
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so should i gutt the cat or not?
somebody just give me a straight answer please
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Location:
Southern Sydney
Registered:
August 2002
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Re: turbo cat convertor
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Fri, 15 November 2002 02:25
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If the cat is already broken (ie. melted) then Yes.
If there is nothing wrong with it leave it be. The performance gains are not worth the risk of being done, its a bloody huge fine.
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Location:
North Sydney
Registered:
May 2002
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Re: turbo cat convertor
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Fri, 15 November 2002 11:56
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Just for the record, i had a piece of pipe put in for testing purposes instead of the 3 inch hi flow cat. The cat came from Queensland and has the largest gap area between the honeycomb runners, so it was quite a good one.
With the cat in, 270rwhp.
With straight pipe, 300rwhp.
Same dyno, same day. A/f ratios had to be re-aligned because the straight pipe leaned the ratios out cause it flowed better.
But cool1 i'm sure will tell you "good quality cats dont restrict at all".
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Location:
Montrose, VIC
Registered:
May 2002
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Re: turbo cat convertor
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Fri, 15 November 2002 13:48
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Well of course a cat converter is going to have to restrict the flow a little bit to actually do its job properly - but then its also muffling the sound a bit at the same time, so can maybe be used instead of one of your mufflers.
As for backpressure, the whole theory of gas flow etc. is very little understood and a bit complex - generally it works best to just stick the biggest pipe on the end of the turbo possible. Also remember the massive amount of restriction that a turbo places in the exhaust 
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