28-03-2012, 09:50 PM
I would like to add my experience to this thread...
First off my inlet manifold cost £40 posted and was fitted a few weeks later by Carl Chambers for £30. I bought all my own fuel lines off ebay. The inlet manifold I got has a resonator bung in it which...
i feel that it makes it louder and perhaps makes a small flat spot at around 3.5k. However after 4k and especially 5k it definitely seems to kick in. The noise this manifold makes is brilliant. You can hear the air being sucked in as soon as you plant your foot.
So the bad things... my PAS pipe is currently rubbing up along side the manifold so that is one thing that definitely needs a good whack out of the way when youre fitting the manifold. However this is my main point... fuel lines! Obviously make sure they are rated for high pressure fuel and that they are not colourful ones for motorbikes. Main reason being our engines are injected so the fuel lines are under pressure where as on a bike the fuel is just sucked by the engine. My main problem has been the settling in of pipes. Once you have fitted your manifold I would recommend tightening up all fuel hose clips or at least checking them before every journey.
The first drive i did there was no leaks... the second there was no leaks... after 260 miles to liverpool there was a slight leak. So i tightened them. A 10 mile drive through liverpool and the smell was pungent and they were tightened again. Last week I did the same trip through liverpool again and there was petrol all over the top of the engine and the underside of the bonnet was coated. As the engine was running you could see it spurting out. I tightened them and it then wasnt leaking... I didnt even go for a drive today but i thought id see how it was going and it was still dripping out so a few more turns.
So yes my two cents... keep tightening the fuel clips!
First off my inlet manifold cost £40 posted and was fitted a few weeks later by Carl Chambers for £30. I bought all my own fuel lines off ebay. The inlet manifold I got has a resonator bung in it which...
cwspellowe Wrote:Resonators are used to "tune" air flow in the inlet chambers to assist the pulsing flow of air into the cylinders. NASP cars obviously don't have anything to force air into the cylinders so the pulse tuning of the resonant frequencies can assist the flow of air. Basically so each "pulse" of air hits the mouth of the cylinder as the valve opens. On the GTI6 there are two resonators, one on the airbox to adjust the inlet noise and one on the inlet manifold to fine tune the air flow.
On the GTI6, replacing the one on the manifold actually creates MORE noise, more of a throaty low down grunty noise.
There would normally be no need to change the helmholtz resonator on a standard gti6 engine as it has been designed in such a way as to improve air flow in that particular engine. Change the engine and it has nowhere near the same effect. Change the induction setup of the GTI6 engine and again, it alters how effective the resonator is. I ended up using a bung as 1. my induction setup was a lot different to standard and 2. I felt like it.
I don't think anyone really knows exactly what difference it makes on the 1.8 as noone really knows the science of the airflow of the GTI6 manifold in combination with the 1.8 engine. It may make more noise, maybe less noise, more or less power, different torque spread, who knows? It won't create a "massive flat spot" all by itself though.
i feel that it makes it louder and perhaps makes a small flat spot at around 3.5k. However after 4k and especially 5k it definitely seems to kick in. The noise this manifold makes is brilliant. You can hear the air being sucked in as soon as you plant your foot.
So the bad things... my PAS pipe is currently rubbing up along side the manifold so that is one thing that definitely needs a good whack out of the way when youre fitting the manifold. However this is my main point... fuel lines! Obviously make sure they are rated for high pressure fuel and that they are not colourful ones for motorbikes. Main reason being our engines are injected so the fuel lines are under pressure where as on a bike the fuel is just sucked by the engine. My main problem has been the settling in of pipes. Once you have fitted your manifold I would recommend tightening up all fuel hose clips or at least checking them before every journey.
The first drive i did there was no leaks... the second there was no leaks... after 260 miles to liverpool there was a slight leak. So i tightened them. A 10 mile drive through liverpool and the smell was pungent and they were tightened again. Last week I did the same trip through liverpool again and there was petrol all over the top of the engine and the underside of the bonnet was coated. As the engine was running you could see it spurting out. I tightened them and it then wasnt leaking... I didnt even go for a drive today but i thought id see how it was going and it was still dripping out so a few more turns.
So yes my two cents... keep tightening the fuel clips!