Det-Cat: Any experience??

[ricardo]

Has anyone experience of de-cat'ing the T350 (or other speed 6 powered monsters)?? I'm interested to know what the results actually are; and ultimately if it's worth doing...

[daftlad]

Hi Richard,
Had my T350c decatted a few weeks ago. It seems to rev more freely and appears to have a little more low down torque although I have no pre and post dyno figure to demonstrate.

The pipes fitted in place of the cats are identical in external appearance.

Combined with a sports exhaust system, noise is 104.5db at 4500 rpm measured at 1.5m.

Car pops a little more on the overrun than before.

[neil.b]

daftlad said:

Hi Richard, Had my T350c decatted a few weeks ago. It seems to rev more freely and appears to have a little more low down torque although I have no pre and post dyno figure to demonstrate. The pipes fitted in place of the cats are identical in external appearance. Combined with a sports exhaust system, noise is 104.5db at 4500 rpm measured at 1.5m. Car pops a little more on the overrun than before.

No experience other than hearing Daftlads car a while back - sounds glorious

[Dookie]

Daftlad

Where did you get the pipes from, and of course.....how much?

[daftlad]

From Hexham Horseless Carriages - still dont know what they cost but it was worth it!

Speak to Tony on 01434 601666 and tell him you saw my advert on here - still time for me to get some discount!!

[Dookie]

I gave Tony a phone and they cost £115 each, don't know if this is inc VAT or not . Peninsula have them for sale at £150 + VAT = £176.25.

[nubbin]

I presume you can stick the cats back on for the MOT at some point in the future?

[mjc]

it would be interesting to know what actual difference they make to the bhp/torque... did they mention anything when you got the prices..?

[daftlad]

Cats go back in for MOT as required....

No mention of any increases when I bought mine.

[ricardo]

Thanks for the replies.

Was the car re-mapped when you had the cats removed and sports exhaust fitted?

And is the whole shooting match a bigger bore, or as per the standard bore??

[daftlad]

Bigger bore I think. On the mapping front, I am told that the ECU reads any changes and remaps without any further input.

[ricardo]

I vaguely recall from somewhere that the engine management uses an open-loop system, rather than closed-loop, and understand that the lambda sensor is before the cats - wouldn't this mean a re-map to gain benefit?

I'm not going to pretend that I know how the system works - anybody know the actual details and modification requirements?

[ricardo]

I vaguely recall from somewhere that the engine management uses an open-loop system, rather than closed-loop, and understand that the lambda sensor is before the cats - wouldn't this mean a re-map to gain benefit?

I'm not going to pretend that I know how the system works - anybody know the actual details and modification requirements?

[fish]

Speaking to someone who has removed them rather than put new pipe in he gained about 20bhp overall

[Dookie]

Apparently, the HHC pipes look like the original Cats, but have the internals removed.

[neil.b]

fish said:

Speaking to someone who has removed them rather than put new pipe in he gained about 20bhp overall

I meant to drop you a line James (on a connected subject). I was speaking to Tony the other day and apparently I owe you a pint (he told me you'd given up your place in the queue for me).

Cheers, that's much appreciated.