rayward
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| posted on 5/6/09 at 05:04 PM |
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LPG Advice
i know a few of you on here have fitted your own lpg conversion to tintops,
i'm looking a doing the same, and just wondered how difficult it is?
am onk with the actual fitting, but not sure about the "mapping" etc?
cheers
Ray
[Edited on 5/6/09 by rayward]
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bob
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| posted on 5/6/09 at 05:08 PM |
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Ray,drop a u2u to paul beyer, he took a course for licence to fit LPG and will be able to point you in the right direction.
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mark chandler
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| posted on 5/6/09 at 07:04 PM |
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You spend a lot of time planning, the actual fitment is easy enough.
I have a second hand Tartrini TEC99 setup if you want it for £250 (full sequential injection, no loss of power).
It's missing injector nozzles, cost pennies and front to back pipe.
You get ECU, Injector rail, wiring loom (although a few bots need piecing out), vaporizer and toriodial tank to throw in the spare wheel well or under
the car.
I got it for the SWMBO but then the local LPG garage shut.
I run my own car on LPG, it saves a fortune for me.
Regards Mark
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britishtrident
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| posted on 5/6/09 at 07:18 PM |
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A lot depends on what car you are converting.
Most modern systems self map to a great extent, the petrol fuel injector times are used as the basis for the gas injector times. The gas injection
system essentially take the signal to the petrol injectors and applies a correction factor to it and sends the modified signal to the gas injectors.
Because the gas injectors open and close more slowy than petrol injectors the relationship between the times the petrol and lpg injectors are open
isn't constant a correction factor of 1.4 might apply at idle and 1.1 under load.
After installing the lpg kit you connect a PC and from the LPG software start an auto-calibration procedure.
with the Stag system I used the calibration starts at idle speed by switching one cylinder at a time to gas using feed back from the lambda sensor,
manifold depression and rpm to create an initial set of settings.
The next stage is to take the car on road test and gather more data this can be done with or without a laptop connected. Intially the car is run for
a few miles on petrol to gather a enough injection times under various loads to draw the petrol curve, You can then lock the data for the petrol
injectors and repeat the process driving the same route running on LPG
The gas and petrol curves can be compared and by simply using a mouse to click drag the the lpg injection time correction factors the LPG curve can be
fitted to the curve formed by the petrol data. ---- like the Meerkat says simple ! Compare the petrol, Compare the LPG.
The problem comes if your engine puts big demands on the LPG injector and the times start to over lap causing a weak mixture uder some load and rpm
conditions.. If that is the case you have to think about tweeking the size of the hole in the nozzle that meters the flow gas and the gas
pressure.
If you alter either you simple auto-recalibrate then repeat the gas road test and tweek the curve again.
The trick is to choose the correct size of metering hole start with --- with some makes of injector to alter the metering hole you can simply start
small and drill it out others are factory set.
You will find download links to manuals for a couple of systems below http://www.europegas.pl/documents/Instruction_OSCAR-N_ENG.pdf
Oscar-N Software -- works in demo mode
http://www.europegas.pl/?lang=en&content=software
Stag-4 & 300 Software & manuals
http://www.ac.com.pl/download/instructions-and-manuals,409/
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rayward
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| posted on 5/6/09 at 08:58 PM |
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thanks guys,
its a 2003 jeep cherokee 2.4 ( 4 cylinder)
just want to get it right first time!
time to do some serious reading me thinks
Ray
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britishtrident
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| posted on 6/6/09 at 08:49 AM |
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Quite a lot of these have been converted it might be worth find a Jeep owners forum and finding out what type of system they have used and what type
of tanks they installed. That type of info can save a lot of time and money.
With tanks bigger is better unless you live right next door to a lpg station.
the Tinley Tech website is always worth a visit on lpg matters the guy who runs tinley is very helpful and has a lot of detailed knowledge. The kits
are also top quality.
If your vehicle has an alloy inlet manifold rather than plastic you might be able to fit a single point mixer kit which is cheaper however given the
choice I would pay the extra buck fit a sequential system.
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britishtrident
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| posted on 6/6/09 at 11:05 AM |
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Tinley Tech Website http://www.tinleytech.co.uk/
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