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Old 02-06-2010, 01:38 PM
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BAD300 BAD300 is offline
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Join Date: Feb 2010
Location: Melbourne, Australia
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After reading a pretty concise doc' on the 3 fuels of choice, gas, LPG or LPI, the injection is the superior one although obviously costly. This eliminates the Mixer AFR/tune probs totally by ECU (stand alone I would guess?) controlling each individual cylinder as in EFI

You guys have hinted to & imo right on the button concerning the Mixer being nothing but a pain in the ass. It is difficult to tune & requires re-tuning periodically. Is uneconomical. Unreliable. Damn dnagerous to engine from what I have read. Unless this LPG installer guru can suggest something wonderful to me. Eric, I would be really hesitant to simply try & fix the inlet mani. Sure it makes sense & may help but won't rectify the prob I don't think? Again, right now I believe the mixer shouldn't have been used in the first place the way it is set up. Running on straight LPG via mixer affords slow start ups & dangerous backfiring. EFI fixes this so you don't need dual fuel.

Also, although these cars do orig' have an ECU, it is a very basic one that does little more than control cold-start really. Has no effect on AFR or timing etc from what I read also so, it can't be manipulated as in an EFI set up which utilises the ECU with proper complex sensors such as o2 exhaust sensor & knock sensor as with my 88' Mazda 323 Turbo.

I will be discussing this LPG dilemma with installer hopefully Monday.

Thanks for your help it is priceless! I will let you know how I go on Monday

Here's the article btw: a get-to-the-point doc' on LPI: http://www.lpgli.com/features.html

I've found this a good explanation of the 3 different fuel delivering methods:
Not rocket science but a simple comparison of fuel delivery systems. Perhaps you guys know it in more detail? Along with your points, it helps my to decide whether it's worth the hassle to try with Mixer feed:

Here are a few other informative articles/doc's with good explanations:

http://www.go-lpg.co.uk/Turbo.html

http://www.go-lpg.co.uk/which_conversion.html

http://www.amershamauto.com/pages/how_lpg_works.htm
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Last edited by BAD300; 02-06-2010 at 03:06 PM.
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