Well i want to put a new exhaust in my car, with only one muffler at the rear.
Should I go for a 3" exhaust or for a 2.5" ?
im plannig to change the chip, maybe in a few months a t3/t4.
there are any pictures of a 3" and a 2.5 " exhaust?
thanks .
Well i want to put a new exhaust in my car, with only one muffler at the rear.
Should I go for a 3" exhaust or for a 2.5" ?
im plannig to change the chip, maybe in a few months a t3/t4.
there are any pictures of a 3" and a 2.5 " exhaust?
thanks .
I think 2.5 is the average size....and what I plan to fit.
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
In a world full of compromise...
...some don't.
___________________________
Opel Astra Sports Tourer 110HP 2017
Alfa 147 1.6 16V 120HP
Alfa 155 Q4 2.0 16V turbo
In a world full of compromise...
...some don't.
___________________________
Opel Astra Sports Tourer 110HP 2017
Alfa 147 1.6 16V 120HP
Alfa 155 Q4 2.0 16V turbo
In a world full of compromise...
...some don't.
___________________________
Opel Astra Sports Tourer 110HP 2017
Alfa 147 1.6 16V 120HP
Alfa 155 Q4 2.0 16V turbo
I run a 2.5" on mine, no Cats and just a single rear box. It is louder than standard but not over the top. I run Hybrid Turbo & uprated chip and it has really put an edge on the performance.
What performance are you ultimately looking for?
The 2.5 on mine seems fine
1993 Alfa Romeo 155 Q4 , 2.0 Turbo
ohh its difficult to answer now that je but by now, i have the std chip and turbo.
Im going to change the exhaust, then new chip.
and when i get bored, ill put the T3/T4 hybrid .
Maybe, in a future (a year or something) ill put forged pistons. But for now, beucause of what ive read here 2.5" will be Ok.
Exhaust size is linked with power output - more power demands a bigger diameter exhaust and on a turbo engine bigger is better, some drag cars run with only a very short pipe which exits at the front. Non turbo engines are different, you have to carefully match exhaust dia with power, go too big and lose power.
I de-catted mine and went for 3" with only one silencer at the rear, the power output went up so much the clutch then slipped.
Problems expected with bigger exhaust and de-cat:
Noise. SS is thin therefore more noisy, less cats and silencers add to this, it can be a PITA on the motorway.
Clearance issues if badly made, although bigger will always hang down further.
De-catting isn't very good for the environment and illegal in many places.
Turbo failure. The small turbo tends to lean against the back pressure of the restrictive cat and exhaust, take this away and it will spin up lovely, so much so It will eventually collapse. A good excuse to trade up to something a little bigger.
What would the power difference between 2.5 and 3.0?
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
what do you guys think of this? Its a CHEAP T3/T4 turbo... its ebay # is
360058642313
jimn~
http://cgi.ebay.co.uk/ws/eBayISAPI.d...3%2B%26fvi%3D1
Ridiculously cheap, which says a lot for me...but not a lot to lose either
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
Personally I wouldn't buy that. I think in the turbo world you get what you pay for. Any weak link in the unit will show itself pretty soon due to the speed they work at.
1993 Alfa Romeo 155 Q4 , 2.0 Turbo
even cheaper with an internal wastegate.. isnt this about 180 British pounds??
http://cgi.ebay.com.au/MonstA-T3-T4-...QQcmdZViewItem
Normally you should go for 3" if you aim a bit over 300 hp. I have ~320 hp and 2,5" with the two standard cats in parallell.
What is best to do is to use the CO-measuring output, just next to the lambda probe, connect a hose from it (first steel pipe, then hose because of the heat) and have a pressure gauge in the cockpit. If the pressure is below 0,1 bar it is ok. If it reaches 0,3 bar it is really bad. I would not let the exhuast back pressure go over 0,2 bar.
It looks like it fell out of a Christmas cracker.
Guys, don't buy your tuning parts from Ebay, it's the last place to go. The only time you can buy something on there is if you are already knowledgeable on the subject of whatever is for sale, then you will know for certain whether it is a bargain or not. If not leave it there, there is usually a good reason something is cheap or somebody is getting rid of it.
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
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