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Author Pro Tech Manifolds
Gregor
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Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
15th Jan 07 at 21:28   View User's Profile U2U Member Reply With Quote
My car seems quite raspy when i boot it , maybe at around 3k revs ?

Would it be due to the 4 branch ?

I do NOT have a decat
IvIarkgraham
Premium Member

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Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
15th Jan 07 at 21:29   View Garage View User's Profile U2U Member Reply With Quote
you fitted that grill yet?
Gregor
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Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
15th Jan 07 at 21:59   View User's Profile U2U Member Reply With Quote
Yes matey , got the bumper to fit though
csweatherston
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Registered: 16th Jan 06
Location: Devon
User status: Offline
17th Jan 07 at 01:32   View User's Profile U2U Member Reply With Quote
my protech was a shit fit (when it still had the orriginal flange)....it kept opening when i booted it, and sounded sh!te
Scotty C
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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline
17th Jan 07 at 02:03   View User's Profile U2U Member Reply With Quote
Mine sounds amazing
VegasPhil
Premium Member

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Registered: 16th Jan 05
Location: Fareham, Hants Drives: Octavia VRS
User status: Offline
17th Jan 07 at 10:11   View Garage View User's Profile U2U Member Reply With Quote
Does it work now Gregor?

Corsa 2.0 16v Vegas - Sold
andyc1234
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Registered: 7th Nov 06
Location: Lancashire
User status: Offline
17th Jan 07 at 18:08   View User's Profile U2U Member Reply With Quote
mine makes a bit of a mad noise with a manifold on like a bit of a rasp but from the front. its sounds best touching 6500 rpm
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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17th Jan 07 at 19:08   View User's Profile U2U Member Reply With Quote
I have one here to try. collector (bit where the 4 pipes come together at the flange) is a shite design so im chopping it off and replacing it ith a straight piece of 2.25" pipe into the exhaust system.

other than that its a decent design.

oh and greg, if you have a decat, thats more likely to cause a rasp.
csweatherston
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Registered: 16th Jan 06
Location: Devon
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17th Jan 07 at 19:54   View User's Profile U2U Member Reply With Quote
uh?..replache the collector with a piece of 2.25" pipe?..

how do you plan on getting the 4 pipes airtight?....
Gregor
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Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
17th Jan 07 at 22:48   View User's Profile U2U Member Reply With Quote
Almost working phil !

Nah I have a cat
Dave A
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Registered: 10th Dec 03
Location: County Durham
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17th Jan 07 at 22:56   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by csweatherston
uh?..replache the collector with a piece of 2.25" pipe?..

how do you plan on getting the 4 pipes airtight?....


by tig welding a proper collector and flange on
csweatherston
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Registered: 16th Jan 06
Location: Devon
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18th Jan 07 at 01:41   View User's Profile U2U Member Reply With Quote
erm...slightly pointless dave... i had the flange cut off mine, and a 2 1/2" pipe with flexi to the cat..... the only way i could stop the rasp...

whats wrong with the standard collector?
Steve X16XE
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Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
18th Jan 07 at 12:13   View User's Profile U2U Member Reply With Quote
I have one, It did rasp for a bit. But that was because the flange on the old downpipe-cat broke.
When fixed, it still rasped!!! Found my de-cat wasn't fitted correctly!!!
Fixed that, Now... Sounds very nice. Next, Backbox!!!
M303CGO
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Registered: 29th Dec 06
Location: Germany & Yorkshire
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31st Jan 07 at 16:17   View User's Profile U2U Member Reply With Quote
I Had my system fitted today. Magnex full system with de cat.
Sounds deeper at tick over but around 2-3k revs is quite raspy. Can this be sorted?

Cheers
Dave A
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Registered: 10th Dec 03
Location: County Durham
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31st Jan 07 at 16:50   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by csweatherston
erm...slightly pointless dave... i had the flange cut off mine, and a 2 1/2" pipe with flexi to the cat..... the only way i could stop the rasp...

whats wrong with the standard collector?


not at all pointless. the design of the collector is poor. it should be longer. also the flange i/d is about 14mm smaller than the collector i/d this causes a big step right after the collector which is a major restriction and the cause for the raspiness.
M303CGO
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Registered: 29th Dec 06
Location: Germany & Yorkshire
User status: Offline
31st Jan 07 at 19:14   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by M303CGO
I Had my system fitted today. Magnex full system with de cat.
Sounds deeper at tick over but around 2-3k revs is quite raspy. Can this be sorted?


Anyone?
Dave A
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Registered: 10th Dec 03
Location: County Durham
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31st Jan 07 at 19:17   View User's Profile U2U Member Reply With Quote
it will be the decat making yours raspy mate. well its not the decat that does it, the rasp is actually a knock on effect of the inlet design.

get a decat with a silencer
M303CGO
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Registered: 29th Dec 06
Location: Germany & Yorkshire
User status: Offline
31st Jan 07 at 19:26   View User's Profile U2U Member Reply With Quote
So would it be better when i sort my inlet? Thinking of Dbilas with cda filter
M303CGO
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Registered: 29th Dec 06
Location: Germany & Yorkshire
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1st Feb 07 at 10:05   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by M303CGO
So would it be better when i sort my inlet? Thinking of Dbilas with cda filter



Anyone
csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
1st Feb 07 at 13:28   View User's Profile U2U Member Reply With Quote
i think he means the inlet into the decat....

the protech collector isnt too bad, but i totally agree with you that the flange is shoot on the protech manifolds.... it reduces from 2 1/4" to 2".
i had the flange removed and a 6" flexi welded in place....it seriously improves the design....

next i need something to guard the lower branches from the road
Scotty C
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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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1st Feb 07 at 13:43   View User's Profile U2U Member Reply With Quote
Mine DID NOT change exhaust note what so ever when I fitted my inlet
davey_jack
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Registered: 28th Jan 06
Location: Horley, Surrey Drives: Clio 182
User status: Offline
1st Feb 07 at 14:20   View User's Profile U2U Member Reply With Quote
my protech manifold fitted fine, I just had to grind it back a bit around the base to allow the thermostat housing to fit! Also I have a decat and a straight through centre pipe with scorpian back box and it sounds lovely, no raspyness!
Dave A
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Registered: 10th Dec 03
Location: County Durham
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1st Feb 07 at 16:19   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by csweatherston
i think he means the inlet into the decat....



no, I meant the inlet manifold on the engine. different inlets affect the exhaust sound a lot. as a general rule, the shorter the inlet the louder the exhaust.
csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
1st Feb 07 at 19:06   View User's Profile U2U Member Reply With Quote
you are joking right?........would be un-noticable, untill you start getting valve bounce/overlap... would also depend on the air filter/ t/b,
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
1st Feb 07 at 19:14   View User's Profile U2U Member Reply With Quote
no, its 100% true.

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