View Full Version : Cat replacment pipes.
Steve3961
02-11-2001, 18:36
Looking at the ABD website they have a cat replacment pipe for the 1.8T and a dyno to prove it adds 26BHP to a chipped car with a otherwise standard exhaust! Has anyone seen or heard of this before? They go on to mention another pipe. do you need both pipes or does the C R P mate to the standard system?
Yep, its an easy way to get a bit more power from you car, basically you switch the cat for a straight through pipe which means there is less restriction to the flow of gases and so less back pressure and more performance, a more elegant way of doing it would be to buy a sports cat so your car will still have a catalytic converter then you do not have to go through the hassle of changing pipes back an forth come MOT time.
Good mod, chnages the sound too.
Cheers
Do you know ABD's web site address?, i would like one of those cat replacement pipes!, need more power:D
Have got no idea don't know who ABD is if you point me to ABD i'll have a look.
This might be wrong but by reducing the back pressure can you not nacker the valve seats?
Mark
abd web site lots of vag stuff
http://www.abdracing.com/
:cheers:
I was also told that by reducing the back pressure the ceramic bearings in the turbo wont last as long as they rely on this pressure to keep a good seal on the oil seals
Couldn't tell you about these bearing and valve seat problems you guys are on about, doesn't sound right to me, think about it cars with turbos etc were doing fine before the introduction of the cat, remember the cats were brought in for emissions control and not to help the engine in any way shape or form, if anything it killed of a few good cars like the 205 GTi.
Cheers
Steve3961
04-11-2001, 12:47
The turbo's on the 20vt don't have ceramic bearings anyway. These are very expensive turbo's that are normally hybrids. For ABD's web site go to www.impossible-performance.cwc.net/ and click on "VW owner's this way" then on mk4 golf then on "enter" then on perfomance parts and scroll down. Looks good though!
26bhp extra... sounds good!
What was the bhp of the car before and after?
Have you got the dynoplots?
Cheers,
Ben
rriveroll
06-11-2001, 14:51
If you remove the CAT you will get a perpetual Engine Fault Light, which is not a problem, just a hassle. I agree that is better to change the CAT to a high flow version.
Thats very strange, does the Seat have sensors after the cat to check the emissions then? I'm not that knowlegdeable on Seats but the engine management light shouldn't be coming on after removing a CAT is not an electronic device how does it know, interesting? Changing the CAT is like changing your back box really it generally just takes away restriction unless there are any sensors or something there, can anybody explain.
If you are wondering why I am interested being a Fiat Coupe owner, it is because I am looking for a High flow cat to put on mine instead of the straight through pipe and I am look at the possibility of adapting one that already exists out there to go on my car.
rriveroll
06-11-2001, 15:21
On the IBIZA and LEON 1.8T one of the sensors is IN the CAT itself. Since the CAT works at a really high temperature, putting the sensor on the CAT Replacement Pipe will not acchieve the same working temperature, therefore the sensor wont work properly, therefore youll get the fault code. Dont know about other SEAT models.
Trust me Ive tried this before, It just wont work. You wll always get the Fault Light. Putting a High Peformance CAT cost me only $200 US, and cant tell the difference in HP betweet this setup and no CAT at all.
Try http://www.vwturbo.com they have CATS for VW, Audi, that work on SEATS. Theill probably work on your Fiat, youll just have to plug the hole for the O2 sensor with a welder or some kind of bolt.
Steve3961
06-11-2001, 17:27
Originally posted by BenS1
26bhp extra... sounds good!
What was the bhp of the car before and after?
Have you got the dynoplots?
Cheers,
Ben
The dyno's on the site
OK, I'm going mad.... been to the site, done searches on "CAT Replacement Pipe", "Catalytic" etc etc and can't find the damn replacement pipe or the dyno.... please can someone point me to the exactly page.
Thanks,
Ben
Steve3961
08-11-2001, 17:56
Originally posted by BenS1
OK, I'm going mad.... been to the site, done searches on "CAT Replacement Pipe", "Catalytic" etc etc and can't find the damn replacement pipe or the dyno.... please can someone point me to the exactly page.
Thanks,
Ben 1.8T Hi-Flow Downpipe
Constructed from 3" Mandrel bend Stainless steel pipe work, this is a direct fit for any KKK series Turbo unit, Comes with a Cat-Bypass unit which matches the O.E size CAT back exhaust systems and O.e Oxygen sensor mounting locations. On the dyno this down pipe increased Bhp by a massive 26Bhp while still using a standard VW Back Box 'Dyno' (we recommed installing ABD racing Inserts, to limit movment of engine)
http://www.impossible-performance.cwc.net/mk41.8t_dyno.htm
Hope this helps
OK, thanks..... I had just been looking for a CAT replacement pipe, not a whole downpipe!
I guess this would make the exhaust sound a bit more 'meaty' too.
I notice from the Dyno plot that its not a simple bhp increase but the whole power curve is very different. Also, the bhp doesn't cross the torque at 5656rpm, which if I'm not mistaken is normally a sign of a fake/inaccurate plot (As bhp = (torque * rpm) / 5656).
Thanks
Ben
Steve3961
08-11-2001, 18:44
Originally posted by BenS1
OK, thanks..... I had just been looking for a CAT replacement pipe, not a whole downpipe!
I guess this would make the exhaust sound a bit more 'meaty' too.
I notice from the Dyno plot that its not a simple bhp increase but the whole power curve is very different. Also, the bhp doesn't cross the torque at 5656rpm, which if I'm not mistaken is normally a sign of a fake/inaccurate plot (As bhp = (torque * rpm) / 5656).
Thanks
Ben
Dunno mate. Just thought i would be nice but from what i can gather there is a post cat sensor that checks the gas that has come out the cat to make sure it works. i think it would almost certainly be more trouble then its worth! Engine lights etc
ibizacupra
08-11-2001, 19:15
Originally posted by Steve3961
Dunno mate. Just thought i would be nice but from what i can gather there is a post cat sensor that checks the gas that has come out the cat to make sure it works. i think it would almost certainly be more trouble then its worth! Engine lights etc
I noticed on the latest CCC issue that there is an article on tuning a TT Roadster. One of th emods this month was an exhaust system including cat(s). Miltek apparently do sports cats which are of more open design allowing more power and less restriction.
Sports cats eh? How much and where from.
The downpipe would add some power I think looking at the stock size.. especially on a chipped car.
Bill
Steve3961
08-11-2001, 19:37
Originally posted by ibizacupra
I noticed on the latest CCC issue that there is an article on tuning a TT Roadster. One of th emods this month was an exhaust system including cat(s). Miltek apparently do sports cats which are of more open design allowing more power and less restriction.
Sports cats eh? How much and where from.
The downpipe would add some power I think looking at the stock size.. especially on a chipped car.
Bill
Ive driven a TT with the Sports cats and full system at work. i was very impressed drove very well. Spoke to the customer and he said it was the only modification but about £1300 worth!!!
Watch this space for pending news on new 1.8T exhaust system
Will post more when i know more info.
Apparently a REAL 10-12 BHP gain.
rriveroll
08-11-2001, 22:52
You didnt seem to look well in the site.
You can get the Downpipe (for a VW you then need to modify it), and the CAT from
http://www.vwturbo.com/products/catdetail.asp?cat=8
The Cat replacement pipe is part is an option on the downpipe, I recommend you call them, they can probably sell it alone (beware, youll need to do some welding as the stock cat on Seats are welded in, not bolted in)