Okay, I've got a 2.5 normally-aspirated Legacy estate, running LPG. This thing has got 3 cats in it - which is at least 2 too many as far as I'm concerned - particularly since the emissions from LPG are so low

As standard, the bloody car seems asthmatic, with no torque below 3,500rpm. I'm not looking to go loopy with performance (after all, it's a non-turbo running on gas!) but I miss the torque I had on my old turbo-diesels - nice to be able to accelerate hard, in 5th, at 60

So, Scoobysport are talking about £800+VAT for a custom replacement exhaust system, taking out all 3 cats and giving me much better breathing. What do you lot reckon? Worth it? Much improvement in torque/performance?

Thanks guys

[Edited by globbits - 4/26/2002 2:34:38 PM]

 

Or, of course, have you got any suggestions on how I can get some low-end grunt out of the car!

Ta

 

If it's running sole on LPG then I would guess that the cats aren't needed (could be worng - have been before) for emmision reasons and would certainly be restricting things. There are a few other LPG users on the BBS so maybe they can comment. You may also want to check out soem of the LPG fitters and get their comments on the need for cats on converted cars. As for performance increase - you will get some, but couldn't put any figures to it.

Julian.

 

You can turbocharge the EJ25 quite effectively at least on the Impreza 2.5 RS - see the Aftermarket Forced Induction Forum on I-club

[Edited by john banks - 4/26/2002 8:32:50 PM]

 

Hmmm, turbocharged 2.5..... (drools in a Homer Simpson styleee

Would love to, but the LPG system wouldn't deal with it properly. Apparently, the next LPG system (available later this year) works more like a fuel-injection, so doesn't mind about a turbo. But, the current, carburettor-like, systems won't cope. In any case, I get the feeling that would completely ruin the 3-year warranty on the car

According to the LPG people, removing the cats won't cause a problem with the MOT (which is the key thing, at the end of the day ) and there's a chance I can justify it to my insurers, saying it's part of the mods for the LPG system. Ditto for an induction kit of some form.

So, I guess the question I'm really asking is am I going to get significant improvements, for my £940 investment?

Comments?

 

Noone can tell me if the performance difference in getting rid of all 3 catalytic converters is worth £800+VAT?
Someone must be able to shed some light?

 

Ditch the cats, it'll give you bags more bottom end.
MOT will be no problem as I run a S14 on LPG with a straight through custom SS exhaust (rated 150mph and still pulling(off the Queens highway ))
Are you sure the new LPG systems can be put on a scooby???

 

The guy who fitted mine (very well, it has to be said) is involved (somehow) in an Impreza STi that's being trialled with the new system. Admittedly, they're having "issues" with getting it 100%, but it's working happily.

I've been promised an upgrade (for a suitable consideration) when the system's trustworthy, but I still miss low-end torque. Not after 150mph+ but the ability to accelerate hard from 60 without having to change down would be nice.....

PS Thanks Mike!

[Edited by globbits - 4/27/2002 6:28:58 PM]

 

Richard I would be very intersted in the developments of the system as I believed the main reason that you couldn't run on LPG was the size of the turbo, can't feed gas that quick.

My next car will be a scooby or a Evo 5 or 6 but wether I gas it or not will depend on developments.
Mike.