Im from Australia, and my car is an XF Fairmont Ghia, with 250ci fuel injected crossflow alloy head 6. Ive owned it for 6 years and it was on LPG when i purchased it. originally it ran with an italian complex convertor, but i found this to be a pain to tune, so 2 years ago i swapped over to an impco 225 and model L convertor. Im also running megasquirt for the petrol side of things, which has worked flawlessly. about 8 weeks ago i finally bolted on my turbo system, which has been in the pipelines for ages. Im running the stock compression ratio of around 8.9-1, i was going to lower the compression, but decided to try it first. im running a pretty big intercooler so its run great so far, no detonation problems to speak off. Im running the 225 in blow through, and at the moment its my major holdback on making any more power. For timing duties im running a distributor from an older model 250ci which uses the mechanical and vacuum advance, ive recurved this myself by trial and error. Im also using a HKS boost retard box which i adjust in the car. suprisingly at 13psi ive only had to knock off 9deg timing, leaving me with 19deg total at full boost, and still no detonation. I recently dyno'd the car at 6.5psi and it managed to pull 185.5 HP at the wheels this was at 4000rpm, which wasnt to shabby for the boost i was running, now ive increased the boost up to 13psi, and it pulls like a train, but it bottoms out at 4000rpm, the mixer is just to small. the L seems to be marginal at this power level as well, sometimes ill encounter a leanout up high, other times i dont. So as it stands i see my only option is to upgrade to a impco 425 and twin convertors or a gas research Australia 440cfm LPG throttle body. I think ill try the impco 425 first. the only problem ive found with impco is running them on there sides apparently isnt a good idea, as it allows the gas valve to wear, but because of the EFI manifold i really have no choice....
anyways, im not sure if i can post up pics in this forum, but ill give it a go
Gareth