exhaust question

Scarlet · 12-11-08, 03:17 PM

When i bought the type 44 the exhaust was a scafolding pole welded on to a back box, since then i have had a custom stainless steel exhaust made for it, the manifold is a dialynx one and the exhuast is a straight through system.

Could this be strangling the power for the engine? the car does hold back sometimes and i was wondering if its the exhaust thats at fault.
Dont want to go and get another exhaust made for it unless i really have to as the one thats on it sounds good

Was just a random thought that it might not be doing the engine any favours

quattrokid · 12-11-08, 08:43 PM

I would have thought that a straight through would improve the gas flow and make the engine breathe a bit better?

When did you last change your air filter?

spaarky · 13-11-08, 05:06 AM

I'm with quattrokid - surely if you've got custom exhaust pipework & manifold + a straight thru silencer, you've got about as much exhaust breathing as the engine can handle unless you go up to a larger bore system ? i.e. on the list of your engine's limitations, the exhaust system should now be last on the list, not first. Unless there's summat else bothering you about it, that I'm missing ? Is your custom exhaust system made in tubing smaller than the stock bore ? This is the only way that I can see your exhaust system might be 'strangling' the motor's breathing & power

joe90 · 13-11-08, 02:27 PM

Do you have a cat in the system? this could be the problem.

Bryan

4v6 · 13-11-08, 02:46 PM

Quote:

Originally Posted by joe90

Do you have a cat in the system? this could be the problem.

Bryan

Ive just done a set of heads for a chap who strapped them on his converted car which promptly made less power and torque than it should.
It was abysmal.
After some conversations with him i found out he was using a cat converter he'd had squirrelled away in his shed for years.
Turns out the cats too small (2.0litre needs a 3.0litre version) and was absolutely killing power and torque. Replaced it with a de-cat pipe and it flys according to him...
Ive yet to find out if the cats damaged at all but i suspect its got some internal problems as well as being too small.

If you can get the cat off you should be able to see through it with a torch at one end but itll be very directional ie, youll have to be looking straight down the sections to see out the other side.
Could be a cat problem but id still be looking elsewhere first.

Do the basics, plugs and leads, compression test, dizzy cap and rotor, fuel filter and fuel pressures, air filter, ignition timing etc.

Scarlet · 13-11-08, 03:52 PM

Thanks you have all said the same as i was originally thinking, there is no cat on the car its just a straight through exhaust (2.5" if i remember correctly?) .
Got a funny feeling it has something to do with a sensor somewhere just a case of going through everything till i find it, was going to changed plugs, leads, cap etc anyhow.

When i got the exhaust done i thought if its straight through it would help get the gasses out quicker and the guy who done it checked it would be fine before making it up.

Sometimes its a rocket other times it holds back!

Nigel Conniford · 13-11-08, 04:04 PM

Nowt wrong with a streight through system, I had an OEM system on the quattro, changed that for a single box Miltek, still to quite, changed that for a custom stainless 3" system, sounded rather good but still not quite right, now we have a completly streight throw system with a dummy box on the rear 12" x 9" x 3" which is the same size as the Group 4 car's had, except this has no baffles what so ever. Quite liverble with ever though some on here thinks she's a bit load

crisarc · 13-11-08, 05:29 PM

Cannot see it being your system, if the power is on/ off , more likely filter / plugs , or the myriad of sensors on the car, best to do the basic checks first, i have had t44s for years and even ambiant temp can knock the performance!

, a 2.5 system is more than enough for a cooking 10v t44, jet wash the intercooler matrix, and clean the inlet manifold temp sensor, check plugs , rotor etc,
good luck
chris

100turbo c · 13-11-08, 05:58 PM

hi my car was holding back just the same, on the plug leads there is metal shrouds, they are there for interference reasons, i took them off and completly different car no holding bck and a lot smoother try this ...

i thought it was fueling but definetly was not

msh · 13-11-08, 10:09 PM

Straight exhaust is good, if u have problems with ears and if u have turbo engine - there should be both reasons

About cat - interesting, how much does cost new cat?

12-11-08, 08:43 PM	#2
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	I would have thought that a straight through would improve the gas flow and make the engine breathe a bit better? When did you last change your air filter? __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

13-11-08, 03:52 PM	#6
Scarlet Grown up member Classic Audi Club Member Join Date: Jul 2008 Location: South Ayrshire, Scotland Posts: 272	Thanks you have all said the same as i was originally thinking, there is no cat on the car its just a straight through exhaust (2.5" if i remember correctly?) . Got a funny feeling it has something to do with a sensor somewhere just a case of going through everything till i find it, was going to changed plugs, leads, cap etc anyhow. When i got the exhaust done i thought if its straight through it would help get the gasses out quicker and the guy who done it checked it would be fine before making it up. Sometimes its a rocket other times it holds back! __________________ t44 2.2 turbo quattro B4 80 Avant t44 100 2.0 saloon Quattro Nation

13-11-08, 05:29 PM	#8
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	t44 exhaust Cannot see it being your system, if the power is on/ off , more likely filter / plugs , or the myriad of sensors on the car, best to do the basic checks first, i have had t44s for years and even ambiant temp can knock the performance!, a 2.5 system is more than enough for a cooking 10v t44, jet wash the intercooler matrix, and clean the inlet manifold temp sensor, check plugs , rotor etc, good luck chris __________________

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13-11-08, 05:06 AM	#3
spaarky Grown up member Join Date: Oct 2008 Posts: 124	I'm with quattrokid - surely if you've got custom exhaust pipework & manifold + a straight thru silencer, you've got about as much exhaust breathing as the engine can handle unless you go up to a larger bore system ? i.e. on the list of your engine's limitations, the exhaust system should now be last on the list, not first. Unless there's summat else bothering you about it, that I'm missing ? Is your custom exhaust system made in tubing smaller than the stock bore ? This is the only way that I can see your exhaust system might be 'strangling' the motor's breathing & power

13-11-08, 02:27 PM	#4
joe90 Grown up member Join Date: May 2008 Location: Leeds Posts: 450	Do you have a cat in the system? this could be the problem. Bryan

13-11-08, 04:04 PM	#7
Nigel Conniford Chief Sausage Meister!! Classic Audi Club Member Join Date: Jul 2007 Posts: 3,614	Nowt wrong with a streight through system, I had an OEM system on the quattro, changed that for a single box Miltek, still to quite, changed that for a custom stainless 3" system, sounded rather good but still not quite right, now we have a completly streight throw system with a dummy box on the rear 12" x 9" x 3" which is the same size as the Group 4 car's had, except this has no baffles what so ever. Quite liverble with ever though some on here thinks she's a bit load

13-11-08, 05:58 PM	#9
100turbo c Grown up member Join Date: Feb 2008 Location: hampshire in new milton Posts: 350	hi my car was holding back just the same, on the plug leads there is metal shrouds, they are there for interference reasons, i took them off and completly different car no holding bck and a lot smoother try this ... i thought it was fueling but definetly was not

13-11-08, 10:09 PM	#10
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	Straight exhaust is good, if u have problems with ears and if u have turbo engine - there should be both reasons About cat - interesting, how much does cost new cat?