Favor to ask of a UK Rennlister...
11-01-2010, 11:56 AM
#1
Racer
Thread Starter
Favor to ask of a UK Rennlister...
I am looking for a catalytic converter bypass pipe and the cheapest one I've found here is the US is around $270. I came across this one on ebay.co.uk for £60.00 / $96.39 USD and emailed the seller but they are unwilling to ship to the US.
http://cgi.ebay.co.uk/DE-CAT-PIPE-FI...4#ht_500wt_715
I was wondering if any of our friends from across the pond would allow me to have the pipe shipped to them and then ship it over to me? I would cover all shipping costs and be happy to throw in a bit extra for a cold pint of beer.
Not sure what the exact shipping costs would be but I imagine it would have to be less than the $170 difference between the US pipes and the UK pipe.
http://cgi.ebay.co.uk/DE-CAT-PIPE-FI...4#ht_500wt_715
I was wondering if any of our friends from across the pond would allow me to have the pipe shipped to them and then ship it over to me? I would cover all shipping costs and be happy to throw in a bit extra for a cold pint of beer.
Not sure what the exact shipping costs would be but I imagine it would have to be less than the $170 difference between the US pipes and the UK pipe.
11-02-2010, 05:55 PM
#5
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If it's not too late.... I already have one of these (in the packaging and unused) that I have decided not to have fitted due to spending money on other jobs first. £50 + shipping?
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12-06-2010, 08:52 AM
#9
09-30-2011, 06:10 PM
#11
can't see the ebay listing anymore but judging by the price it's a straight bit of tubing which will lose horsepower on a uk car. the cat bypass needs to be similar in size to the cat which apparently helps with back pressure and thus horsepower?
was told this by an exhaust fabricator that trialled both on a 964 racecar
was told this by an exhaust fabricator that trialled both on a 964 racecar
10-01-2011, 02:51 AM
#12
Not sure i follow the logic, not because its wrong just that i'm not a race engineer, engine builder or exhaust fabricator. (unfortunately)
But i have a question: If the system is very restrictive due to the cat cell content, wouldn't any pipe of similar diameter flow gas at a less restrictive rate especially higher up the rev range? In a similar way to the primary or "cup" bypass, which is just a straight pipe? Or does it have something to do with low down torque and back pressure?
I understand that this?
Cat bypass
isn't as good as this?
Cat Bypass
But aren't they both better than this for a less restrictive flow?
But i have a question: If the system is very restrictive due to the cat cell content, wouldn't any pipe of similar diameter flow gas at a less restrictive rate especially higher up the rev range? In a similar way to the primary or "cup" bypass, which is just a straight pipe? Or does it have something to do with low down torque and back pressure?
I understand that this?
Cat bypass
isn't as good as this?
Cat Bypass
But aren't they both better than this for a less restrictive flow?
Last edited by Unkle; 01-14-2013 at 10:04 AM.
10-01-2011, 03:51 AM
#13
Three Wheelin'
can't see the ebay listing anymore but judging by the price it's a straight bit of tubing which will lose horsepower on a uk car. the cat bypass needs to be similar in size to the cat which apparently helps with back pressure and thus horsepower?
was told this by an exhaust fabricator that trialled both on a 964 racecar
was told this by an exhaust fabricator that trialled both on a 964 racecar
FVD and Haywood and Scott, among others both sell straight though pipes
I had a bypass that looked like a cat (subsequentoly turned out to be a Dansk one) and replaced it with a straight through one
Apart from a slighly nicer sound there is little or no difference between the 2 versions and certainly no loss of perceptible power from the straight through
The only loss of power commonly quoted on the 964 is when running a cup bypass and G pipe due to loss of backpressure, 1 of the silencers needs to be retained (apprently)
However if this is the case why did Carrera cup cars run exactly that system?
10-01-2011, 06:48 AM
#14
Back pressure does NOT produce power, it never does and never will!!!
A properly tuned exhaust has such a strong effect on performance that the scaveging effect it produces is sometimes referred to as the 5th stroke in a four stroke engine. Back pressure all but kills this effect therefore seriously hindering performance.
I could try and write pages on the subject and finesses such as gas speed, reversion etc. Instead for those interested please click the following link which leads to what imo is the most indepth article ever published on the subject:
http://www.oocities.org/motorcity/tr...92/vizard.html
As the man behind the article David Vizard says: "I don't have opinions, just my flowbench and dyno"
A properly tuned exhaust has such a strong effect on performance that the scaveging effect it produces is sometimes referred to as the 5th stroke in a four stroke engine. Back pressure all but kills this effect therefore seriously hindering performance.
I could try and write pages on the subject and finesses such as gas speed, reversion etc. Instead for those interested please click the following link which leads to what imo is the most indepth article ever published on the subject:
http://www.oocities.org/motorcity/tr...92/vizard.html
As the man behind the article David Vizard says: "I don't have opinions, just my flowbench and dyno"
10-01-2011, 07:39 AM
#15
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can't see the ebay listing anymore but judging by the price it's a straight bit of tubing which will lose horsepower on a uk car. the cat bypass needs to be similar in size to the cat which apparently helps with back pressure and thus horsepower?
was told this by an exhaust fabricator that trialled both on a 964 racecar
was told this by an exhaust fabricator that trialled both on a 964 racecar