Ok, so i have had the car off the road for over a year. It needed some work. It got new suspension, koni's and ebach springs. Also some new bushes. The later HP2 s6 brakes. It needed more power so it got a GT2871R turbo from 034, RS2 injectors, RS2 exhaust manifold and a front mount intercooler. The intercooler ment a new RS4 style bumber was required. I would of liked to stay standard, but that just wouldnt allowed the intercooler. The head came off and all the valves were ground in. Arp studs were used with a steel gasket. I wanted a good 350hp maybe 400 tops. But quick spool was really what i wanted hence the 2871.
I made inlet pipes from Stainless steel 316 and welded with a stick welder on 316 rods. I made a 3 inch exhaust at the front and made a Y piece into the stock after were the cats "should" be.
I have it all on v bands and can swap in a 3 inch magnaflow cat for mot in 30 mins.
Paul did a map for the car that is 99% perfect without even seeing the car! He is working an a second version that will perfect things.
Now while i like audis (have a URQ) i dont like petrol prices. Thats why im called diesel des and my daily driver was a TDI Mrk2 golf with 2 turbos making close on 300hp. So the 20 mpg at best the s4 got was a kick in the nuts. Especially on a fast run when it goes down to 5 or so mpg... The answer was LPG.
So I did a fair bit of research and picked a kit made by KME. I fitted all the bits and did the wiring myself. The tank is in the spare wheel well and is a 76L tank. They only fill to 80% to leave room for expansion on a hot day. Thats about 60L then.
Now the "gas man" i got the stuff off told me i would have no problem with 400hp+ with his special version of his kit. I reckoned i would need 10 injectors, so i drilled and tapped 10 injection points while the inlet manifold was off. I then connected these to the 5 injectors i had, but always had the scope for 5 more.
So i went to the gas man (called peter) and we started setting the gas ECU up. We hit a few glitches but now the car runs 100% to just over 6K rpm. We spent a few hours trying to find the problem over 6K rpm. It turnes out that my RS2 injectors/petrol ecu go to 100% at that point! That means the gas ecu looses its pulse signal and drops out.
Now im talking to Paul about tweeking the motronic to reduce the fueling at the top end to keep the petrol injectors going 100%. By the way the 5 gas injectors i worried about are only at 60% when the RS2 units are full open. No need for another 5 then!
So whats it go like? Well i have a wideband AFR gauge and that helped setting the gas up. I have feel no/very little difference on petrol/gas. Really. It goes like stink to 6K on both. Obviously it wont run over that on gas yet but that will be fixed soon.
It does 17 MPG on gas when it does 20 on petrol. Gas is 48.5p/L !!!
The only other glitch is that after a long time at flat out the vapourisor temp reduces untill it passes liquid not gas. This takes about 30 seconds of WOT. BAsicly i need to replumb the water circuit so that i get more hot water through it. Will do that this weekend. If that doesnt do it then i will fit a second vapourisor.
But the 99% of the time your not above 6K rpm and flat out for 30 seconds it drives like petrol. Have had it to 150+ on gas on a test track
Any questions work away.
Cheers,des.
I made inlet pipes from Stainless steel 316 and welded with a stick welder on 316 rods. I made a 3 inch exhaust at the front and made a Y piece into the stock after were the cats "should" be.
I have it all on v bands and can swap in a 3 inch magnaflow cat for mot in 30 mins. Paul did a map for the car that is 99% perfect without even seeing the car! He is working an a second version that will perfect things.
Now while i like audis (have a URQ) i dont like petrol prices. Thats why im called diesel des and my daily driver was a TDI Mrk2 golf with 2 turbos making close on 300hp. So the 20 mpg at best the s4 got was a kick in the nuts. Especially on a fast run when it goes down to 5 or so mpg... The answer was LPG.
So I did a fair bit of research and picked a kit made by KME. I fitted all the bits and did the wiring myself. The tank is in the spare wheel well and is a 76L tank. They only fill to 80% to leave room for expansion on a hot day. Thats about 60L then.
Now the "gas man" i got the stuff off told me i would have no problem with 400hp+ with his special version of his kit. I reckoned i would need 10 injectors, so i drilled and tapped 10 injection points while the inlet manifold was off. I then connected these to the 5 injectors i had, but always had the scope for 5 more.
So i went to the gas man (called peter) and we started setting the gas ECU up. We hit a few glitches but now the car runs 100% to just over 6K rpm. We spent a few hours trying to find the problem over 6K rpm. It turnes out that my RS2 injectors/petrol ecu go to 100% at that point! That means the gas ecu looses its pulse signal and drops out.
Now im talking to Paul about tweeking the motronic to reduce the fueling at the top end to keep the petrol injectors going 100%. By the way the 5 gas injectors i worried about are only at 60% when the RS2 units are full open. No need for another 5 then!
So whats it go like? Well i have a wideband AFR gauge and that helped setting the gas up. I have feel no/very little difference on petrol/gas. Really. It goes like stink to 6K on both. Obviously it wont run over that on gas yet but that will be fixed soon.
It does 17 MPG on gas when it does 20 on petrol. Gas is 48.5p/L !!!
The only other glitch is that after a long time at flat out the vapourisor temp reduces untill it passes liquid not gas. This takes about 30 seconds of WOT. BAsicly i need to replumb the water circuit so that i get more hot water through it. Will do that this weekend. If that doesnt do it then i will fit a second vapourisor.
But the 99% of the time your not above 6K rpm and flat out for 30 seconds it drives like petrol. Have had it to 150+ on gas on a test track
Any questions work away.
Cheers,des.
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