WRX_Rich

iTrader: (5)

as my car failed its MOT (emmisions) with the tsl sports cat (might be more to it than a faulty cat) would the vf35 with a p18 housing push enough air to notice the difference between a sports cat and de cat


cheers

Butty

iTrader: (2)

Seem to remember Mike Wood stating that the Prodrive sports cat flowed as well as an equivalent decat? Not a lot of hlep I suppose when dealing with a TSL version though.
What did the MOT fail on exactly? The CAT can only deal with so much rich mixture before it is swamped, especially if it wasn't up to temp. There may be a fuelling fault further upstream to deal with.
How are you going to pass the MOT without any cat at all?

Nick

JIM THEO

I had a 2.5" decated Scoobysport downpipe until last week when I fitted an 100cell cat, 3" Invidia downpipe (similar design with Helix, Greddy and Trust downpipes).
As you can see in my other recent post my power is slightly increased and boost builds faster - lower at power band.
Last revision Prodrive downpipe with splitter is if not better at least the same good with any aftermarket 3">2.5" downpipe!

911

With the new MoT laws coming in March there is a growing trend to sports cats with 100 cell cats.
TSL/H&S etc all claim only a 2 bhp loss over a 3'' decat.

Was yours a New Age Jim or Classic?

All the above pipes are 3'' necking to 2.5 at the end though H&S will do a 3'' all the way for you when i asked.

There will be a big crack-down on decats soon i feel by Plod.
Graham.

dowser

Most likely a faulty lambda sensor IMO. Here in Swissieland we pass the emissions check with just a warmed up stock centre cat.

Richard

JIM THEO

New age Graham!
Richard I thought emissions test is the same at all European countries.

Neilo

surely its easy enough to pop the standard center on as well just to make sure?

then youd have 2 cats on and shoudl pass with ease...i do agree though it must be very annoying to fail on the emmisions when youve gone to the expense of getting a sportscat to prevent it in the first place!

dowser

The point is, any decent sports cat will pass an emissions check, especially considering a stock centre is enough to pass a Swiss one (not sure if they're the same in all European countries). Most likely is a failing lambda sensor - it underreads so your ECU will bung in more fuel in closed loop operation.....ergo you fail the emissions test. Try swapping with a friends lambda, preferably at the garage where they are doing the test.

Is the TSL sports cat in DP or centre section? On most of my customer cars they have knocked out DP cat from stock DP, and replaced centre CAT with a sports item.

Richard

WRX_Rich

iTrader: (5)

na tried a different lamda and maf - think theres a deeper problem as the car hunts when you hold 2k revs (fine on idle), been told it could be drawing in air from somewhere but its not obvious, next step will be a compression test then removing the turbo inlet seeing if its split as the induction kit seems to have a bit too much play

just at a shot in the dark, could this be anything to do with maf scaling as the car has a oversized rcm induction tumpet but this was all mapped by Bob so doubt very much

the cats in the downpipe - you watch it I will be the first on here to get pulled by the plod for emissions even though I have a sports cat

mot is now passed with extra ctas etc but be nice to solve this problem

cheers for the replys guys

Davey P

iTrader: (1)

It won't have anything to do with the induction kit