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Drew1209 said:Magic cheers chaps.
I'm not fussed about MOT as I'd stick the original cats back on, I did think about welding a boss in for the sensors, I've only got the 2 pre cat lamda's on mine.
If a remap is required though, I think buying uprated cats would make sense, dare say I could get it mapped with no cats but when it comes MOT time this could be problematic when sticking the original cats back on
Norfolk & Idea said:Drew1209 said:Magic cheers chaps.
I'm not fussed about MOT as I'd stick the original cats back on, I did think about welding a boss in for the sensors, I've only got the 2 pre cat lamda's on mine.
If a remap is required though, I think buying uprated cats would make sense, dare say I could get it mapped with no cats but when it comes MOT time this could be problematic when sticking the original cats back on
I'm running de cat. But my system has been tuned accordingly and I'm reliably informed it should pass its MOT as it is. I'll let y'all know how I get on :dont know:
Norfolk & Idea said:I'm running de cat. But my system has been tuned accordingly and I'm reliably informed it should pass its MOT as it is. I'll let y'all know how I get on :dont know:
Armagreggon85 said:Norfolk & Idea said:I'm running de cat. But my system has been tuned accordingly and I'm reliably informed it should pass its MOT as it is. I'll let y'all know how I get on :dont know:
I'd be interested to know how you get on. How does your car perform without the cats? What did you do to tune it, just a remap?
911tom said:Norfolk & Idea said:Drew1209 said:Magic cheers chaps.
I'm not fussed about MOT as I'd stick the original cats back on, I did think about welding a boss in for the sensors, I've only got the 2 pre cat lamda's on mine.
If a remap is required though, I think buying uprated cats would make sense, dare say I could get it mapped with no cats but when it comes MOT time this could be problematic when sticking the original cats back on
I'm running de cat. But my system has been tuned accordingly and I'm reliably informed it should pass its MOT as it is. I'll let y'all know how I get on :dont know:
If it's a decat it will fail unless it is the same garage doing the mot as fitted the exhaust for you
Drew1209 said:Is there much to be had on NA 3.4 removing the cats, I know a few responses above are for the turbo, if I decide to do the bypass what would I do with the lambda sensors, I've only got the pre cat sensors or do the bypass pipes have a boss to screw the sensors in.
Exhaust wise just now I'm running the standard Porsche silencers and I'm not really wanting to go much louder
Phil 997 said:Have any of you with decat noticed the supposed low down torque and BHP loss as that was what I was told would happen if I decatted mine and as its a road car it didnt make sense to loss any low down to get top end gain that I would rarely use . So I went 200 cell big bore to get low down gains without any top end loss. but I am interested in what you found , mine is a NA car not a turbo :thumb: :thumb:
poppopbangbang said:Phil 997 said:Have any of you with decat noticed the supposed low down torque and BHP loss as that was what I was told would happen if I decatted mine and as its a road car it didnt make sense to loss any low down to get top end gain that I would rarely use . So I went 200 cell big bore to get low down gains without any top end loss. but I am interested in what you found , mine is a NA car not a turbo :thumb: :thumb:
No, none at all. This is probably the old "you need some back pressure" myth rearing it's head again. Essentially the best possible option regardless of turbo or NA is as little back pressure as possible as this can only help cylinder filling/minimise residuals. In some cases you will need to make changes to the engine calibration to accommodate this but in my experience the single lambda per bank 3.4L cars just work and show gains everywhere.