Powers RV8 turbo kit - where does the main cat go?
Discussion
Ok, so as far as I can see all of the mechanical part of the TVR Power turbo kit comes en lieu of the Y-piece which includes the main cat on Chims and Griffs. So in fact you're de-catting the car at the same time - or are there any provisions made for cars that need to have a catalyst installed - not just pass emissions, but the cat need to be physically present - to remain road legal?
It's ok replacing it at MOT time but if you get pulled at the roadside you are still for the highjump.
I'm sure VOSA keep themselves busy reading these type of websites so could be well aware of the amount of decatting that goes on. Having a defective cat is one thing but I'm not sure how you would fare with one deliberately removed.
That said, I'm not aware of anyone being pinched for it yet.
I'm sure VOSA keep themselves busy reading these type of websites so could be well aware of the amount of decatting that goes on. Having a defective cat is one thing but I'm not sure how you would fare with one deliberately removed.
That said, I'm not aware of anyone being pinched for it yet.
macdeb said:
I think it''s a case of replacing for the MOT, unless some small sport type cats can be used in place of silencer 
Expensive though.
Why, are you thinking of going for it?
A customer of my main TVR man is, but if the whole thing needs to be put back to N/A with every MOT test... frankly I would vastly prefer major alterations of the mechanical layout of an existing car to be tested & certified for road autorities up front Tüv-style... if only to cover ones back for insurance and road traffic officers having a bad day. Expensive though.Why, are you thinking of going for it?
Thought of the cat instead of center silencer idea... but by the sounds of it we'd be guinea pigs. Noise levels and whether the cat gets enough temperature in it to do its job when driving around in normal traffic would be big question marks. I can see such a project becoming an open ended sort of affair.
Ta muchly 
The exhaust fabricating company that my TVR whisperer works with, has said that they might be able to do something like that, too... so it looks a possibility even though it's not the route I would choose personally (it's a std. 4 litre, LHD so no off the shelf S/C solution either, but lots of scope for a bigger/better naturally aspirated lump).
The exhaust fabricating company that my TVR whisperer works with, has said that they might be able to do something like that, too... so it looks a possibility even though it's not the route I would choose personally (it's a std. 4 litre, LHD so no off the shelf S/C solution either, but lots of scope for a bigger/better naturally aspirated lump). SteveSPG said:
on my LS car, which has headers down the sides of the block not forwards, I've opted for cats behind the gearbox under the prop as part of the silencer. not ideal for getting them warm quickly for emissions, but they do work there.
Excellent, just a thought and someone already done it. Which cats did you use Steve?SteveSPG said:
on my LS car, which has headers down the sides of the block not forwards, I've opted for cats behind the gearbox under the prop as part of the silencer. not ideal for getting them warm quickly for emissions, but they do work there.
Should have converted a Precat car Steve.....does away with all that stuff
macdeb said:
SteveSPG said:
on my LS car, which has headers down the sides of the block not forwards, I've opted for cats behind the gearbox under the prop as part of the silencer. not ideal for getting them warm quickly for emissions, but they do work there.
Excellent, just a thought and someone already done it. Which cats did you use Steve?Quinny said:
SteveSPG said:
on my LS car, which has headers down the sides of the block not forwards, I've opted for cats behind the gearbox under the prop as part of the silencer. not ideal for getting them warm quickly for emissions, but they do work there.
Should have converted a Precat car Steve.....does away with all that stuffI got a spare Chimaera exhaust cut the box out and (badly - I can't weld for s
t)) welded in two flanges to install one of my cerbera cats, blocked off the second pipe and hoped this would see me through the MoT,
I was in the early days of figuring out my Megasquirt set up so was some way from gettng it to pass despite a load of fiddling. Would be interested to know if anyone has got.a pass with a single aftermarket CAT.
I was planning to get the local zorst place to weld in two sets of flanges to mount both Cerb cats so at least I have a good base from which to work with the tuning. I think they will both fit where the box used to be. Reminds me that I need to check this... This would be an MOT only exhaust and would be available for a lend if I get round to getting it made.
Without wanting to de-rail, while I think about it any suggestions for best set up for Cat emission test pass on ECU, currently running MAP based, would I be better off with TPS with wideband lamda correction enabled?
Oh and running two turbos, but a self build (not by me) which retains the same locationof Y piece to exhaust connection.
Matt
t)) welded in two flanges to install one of my cerbera cats, blocked off the second pipe and hoped this would see me through the MoT,I was in the early days of figuring out my Megasquirt set up so was some way from gettng it to pass despite a load of fiddling. Would be interested to know if anyone has got.a pass with a single aftermarket CAT.
I was planning to get the local zorst place to weld in two sets of flanges to mount both Cerb cats so at least I have a good base from which to work with the tuning. I think they will both fit where the box used to be. Reminds me that I need to check this... This would be an MOT only exhaust and would be available for a lend if I get round to getting it made.
Without wanting to de-rail, while I think about it any suggestions for best set up for Cat emission test pass on ECU, currently running MAP based, would I be better off with TPS with wideband lamda correction enabled?
Oh and running two turbos, but a self build (not by me) which retains the same locationof Y piece to exhaust connection.
Matt
Quinny said:
Certainly does
Quinny good to see you still about mate :-) I am back and looking for a griff 400 !! anyway the TVR turbo kit I have there are small cats in each manifold I would like to swap these somewere down the line before I use them as I am looking for a pre cat to Turbo charge 
Ste .
From what I understand, the law still isn't 100% about cats, which is why it looks at emissions. I'd like to know what your opinions are. Insurance companies will insure you decatted as a mod? I guess VOSA could still stuff you at the road side if pulled over by the police. However, I think they have their work cut out for them with dodgy HGV's.
However, bolting on a couple of cats in place of the exhaust sounds like a good compromise to me. Surely, the volume levels would only be the same as running catted and sleeved? Alternatively, would it not be possible to add a couple of short cherrybomb style silencers between the backbox and diff if you're worried about volume? It may require a litte alteration on the width of the exits from the box to allow them to clear the chassis main rails. Just a thought.
However, bolting on a couple of cats in place of the exhaust sounds like a good compromise to me. Surely, the volume levels would only be the same as running catted and sleeved? Alternatively, would it not be possible to add a couple of short cherrybomb style silencers between the backbox and diff if you're worried about volume? It may require a litte alteration on the width of the exits from the box to allow them to clear the chassis main rails. Just a thought.
Edited by Chuffmeister on Sunday 18th January 11:41
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