964 power upgrade
Discussion
Hi, I own a manual 964 c2 and am thinking about trying to give it a bit more zip. Was thinking about a cat bypass and new air filter. Anybody know what sort of gain this could give me? Are there any sort of reliability drawbacks? Can it fail on emissions come M.O.T. time? Any advise appreciated, Simon.
I have a cat bypas and K&N filter. can't say I noticed much difference with those fitted.
Big difference when I had it re mapped, although I have got used to that now. If you are interested I will give you his details. Top bloke and he knows his stuff on Porsche
I passed the MOT no problem they said I needed one, yet when they put my chasis number in their computer thingy computer said no.
Its an easy job anyway to swap back if needed.
Probably need a new oxygen sensor as the old one will be virtualy impossible to get out so add £80 ish to your budget.
Big difference when I had it re mapped, although I have got used to that now. If you are interested I will give you his details. Top bloke and he knows his stuff on Porsche
I passed the MOT no problem they said I needed one, yet when they put my chasis number in their computer thingy computer said no.
Its an easy job anyway to swap back if needed.
Probably need a new oxygen sensor as the old one will be virtualy impossible to get out so add £80 ish to your budget.
Edited by pesty on Tuesday 28th November 17:06
Can it fail on emissions ? depends on how old is the car ? After '92 IIRC the cat "should" by law be fitted , but they do tend to fall off between MOTs 
The ECU will as Pesty said, need remapping to make the most of the de-cat
There should be no reliability issues whatsoever
You should see a 20-25 hp gain (on a healthy engine) plus a nice increase in torque and driveability.
For a real improvement in responsiveness, fit an RS lightweight flywheel/clutch package at the same time.
You'll fall in love with car all over again !
Good luck
The ECU will as Pesty said, need remapping to make the most of the de-cat
There should be no reliability issues whatsoever
You should see a 20-25 hp gain (on a healthy engine) plus a nice increase in torque and driveability.
For a real improvement in responsiveness, fit an RS lightweight flywheel/clutch package at the same time.
You'll fall in love with car all over again !
Good luck
911wise said:
Its a 90 car so maybe I dont need to worry about taking of the cat. Would be a pain though to keep having to take it of and put it back on again evey 12 months.
No you definately dont with a 90 car. My car is 1992 registered so you are fine. As slippy said the law came in in somewhere between 92 and 93
Here you go. My car must have been registered before August
"The Department of Transport decided that from 1st of January 1996 petrol engined vehicles equipped with catalytic converters and registered after 1 August 1992 must be tested in the M.O.T scheme in-line with European Union requirements for CO and HC emissions. The limits of the test for each model have been determined by car manufacturers ".
Edited by pesty on Tuesday 28th November 18:14
911wise said:
Good news about the cat then. Anyone recommend anyone? I hear neinmeister are good.
ninemeister are good and would not sell crap so you cant go wrong with them.
Plenty of online places sell them. some just a straight pipe like this on ebay at the moment but it is not stainless steel.
http://cgi.ebay.co.uk/CAT-REPLACEMENT
Mine bulges in the middle and looks like teh origonal item. not sure if there is a bennefit to that.
The only recomendation when I was looking was to get one that you could put the Lamda sensor in.
The cat bypass 'with the bulge' will sound different to the straight pipe. Down to personal preference and whether you do a silencer bypass as well.
Has added advantage that it looks like a sports cat, and the MOT tester won't question it if you tell him its a cat ;-)
As I understand the rules on MOT and cats, you don't actually need to have a cat on a 1992 or later car, it just needs to pass the correct emissions, so if your Porker is clean burning you're alright.... ;-) again.
Has added advantage that it looks like a sports cat, and the MOT tester won't question it if you tell him its a cat ;-)
As I understand the rules on MOT and cats, you don't actually need to have a cat on a 1992 or later car, it just needs to pass the correct emissions, so if your Porker is clean burning you're alright.... ;-) again.
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