Tuning box/ remap for LPG (autogas) converted UK XH Hemi?? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 7 (permalink) Old 09-21-2018, 11:47 AM Thread Starter
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Tuning box/ remap for LPG (autogas) converted UK XH Hemi??

Hi guys, so as the title suggests I'm looking for a tuning box for my XH Hemi, that is LPG converted. I want to be able to recalibrate a larger wheel size and then thought it would be fun to try and gert some more user friendly performance out of the Hemi!

However I have spoken to a number of companies including:
Superchips,
Bully Dog,
Barbus (Startech),
Diablo,
Banks Power,
HYPERTECH,
Jet Chip

and unfortunately NONE of them can support an LPG converted car!! Sometimes I hate being a UK Jeep owner, we get none of the fun stuff that you guys get over here, or we have to pay through the nose for it!

Anyway from my research, for any XH owners who are thinking of tuning boxes, a few companies.... Bully Dog, Hypertech, Jet Chip say they do support the XH version but when you cut to LPG all memory will disappear as it flips from the main ECU to the LPG system. I do not know enough about the switch over between the two systems so can't say one way or the other and most of my driving is done on LPG as with a 5.7ltr petrol over the pond would drain my bank in days!! So I appear stuck..

I have four questions really:
1 - Has anyone with a LPG converted XH had any successful experience with tuning boxes?
2 - Has anyone with a LPG converted XH had any experience with professional remaps - I didn't want this necessarily as you can't change it once you've done the remap, you're stuck in that setting? I may be forced down this route if it is even possible.
3 - Has anyone with a LPG converted XK had any experience with tuning boxes? I'm interested to hear if it worked.
4 - Does anyone with LPG experience have more knowledge on the LPG ECU and how it links to the main ECU and therefore how it would be affected by a something like a tuner connected to it or remap.

Cheers everyone

5.7 V8 Hemi!!!
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post #2 of 7 (permalink) Old 09-21-2018, 12:17 PM
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O.K. PCP, I guess I'll be the one to ask; What in God's Green Earth does LPG stand for?

LPG converted?? I'm at a loss.....


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post #3 of 7 (permalink) Old 09-21-2018, 12:39 PM
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Liquid petroleum gas. Propane.
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post #4 of 7 (permalink) Old 09-21-2018, 12:40 PM
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Quote:
Originally Posted by Carbuff View Post
Liquid propane gas.
I didn't know there was such a modification for XK's/XH's.

See, I learned something new today - that's why I like asking questions.

Thanks @Carbuff.


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Last edited by Big Blue; 09-21-2018 at 12:43 PM.
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post #5 of 7 (permalink) Old 09-21-2018, 01:03 PM Thread Starter
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Join Date: Jun 2017
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Quote:
Originally Posted by Big Blue View Post
O.K. PCP, I guess I'll be the one to ask; What in God's Green Earth does LPG stand for?

LPG converted?? I'm at a loss.....
Exactly as Carbuff says....it’s a secondary fuel for me which is half the price of petrol and works as efficiently. The 90ltr tank on my Hemi goes where the spare wheel would go underneath.

You can pretty much convert any vehicle to run it I believe.

Over here where we’re paying cú1.34 a litre for petrol it gets expensive!

5.7 V8 Hemi!!!
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post #6 of 7 (permalink) Old 10-03-2018, 04:30 AM Thread Starter
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Join Date: Jun 2017
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So for any XH owners thinking of tuning boxes with or without LPG conversions I have now had more clarity on this point having spoken to othe LGP users with tuners and also my installer who confirmed with a company he knows that deals with this sort of thing.

It basically makes no difference whether you have the LPG conversion as the LPG ecu piggybacks onto the main ECU and has an adaptive memory that just copies whatever is on the main ecu. Therefor any tuning added will pass across. Also as LPG has a higher octane to petrol there is potential to run the height octane tune when on LPG.

Also, I have confirmed with Superchips that there is a 50/ 50 chance of their tuners working with XHs however Hypertek, Bully Dog and Diablo Sport all work with them.

Looking back at my first post, these companies that said it wouldn’t work just didn’t understand the LPG setup so couldn’t answer correctly and just said no it didn’t work.

5.7 V8 Hemi!!!
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Last edited by PhilCommanderPayne; 10-03-2018 at 04:33 AM.
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post #7 of 7 (permalink) Old 10-04-2018, 01:26 AM
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I drove a propane power truck for the city in the 90's. It was an absolute underpowered dog and ran out of gas very quickly. They apparently need much higher compression to be efficient. Not sure if anything has changed with the conversions. If your system runs the same with either fuel, I can't see why a programmer wouldn't work with both.
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