Mazda RX8 LPG Conversion

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six_impressive_hours · Fri Jan 26, 2007 12:29 pm

Hi, A friend of mine was impressed with the prins autogas conversion on my 330ci and was wondering if a conversion could be done on his Mazda RX8. Bearing in mind that this is a rotory engine - is there any reason that a conversion shouldn't be carried out? Perhaps one of the professional installers could offer their opinion <IMG SRC="http://www.my90.co.uk/lpgforum/clipart/happy.gif" ALT=":-)" BORDER=0> Cheers James

woody · #2 Post by **woody** » Fri Jan 26, 2007 10:23 pm

Hi James, i dont know any one who has converted an RX8 yet. Petrol injection strategies seem to be the stumbling block,rotaries need an awfull lot of fuel in relation to engine size. Cheers Keith <a href="http://www.gastech.org.uk" target=_top>www.gastech.org.uk</a>

go_lpg · #3 Post by **go_lpg** » Sat Jan 27, 2007 9:43 am

I haven't done one either. I'd relish the challenge but there is a lot of intertia against it. Research takes time and many cannot do without their cars for that long. Add to that the fact that folk will try and use a company that has done the job before. Result is that no one gets to go first! The only way I can get around that is to buy a car (I often do that for development) but I'm not sufficiently curious to go and buy a Rotary. Are there any Rotary models out there that would provide a good research platform whilst not being too high in price? Regards Steve <a href="http://www.go-lpg.co.uk" target=_top>www.go-lpg.co.uk</a>

classicswede · #4 Post by **classicswede** » Sat Jan 27, 2007 11:20 am

I do know of rotary engines that have been converted on mixer systems. To convert a RX8 you will need to use gas injection. I don't see the Piro having any problems running this engine but as Steve has pointed out the conversion is going to take some to make sure it is running correctly. This is not a conversion the avarage installer would take on.

simon_egas_uk · #5 Post by **simon_egas_uk** » Sat Jan 27, 2007 3:10 pm

Hi All and in particular James e-GAS has sucessfully converted this car. It was done by one of our french installers. If I knew how to I would put the picture here, But I will email them to anyone intrested. Simon

go_lpg · #6 Post by **go_lpg** » Sat Jan 27, 2007 6:28 pm

Simon, That's good to hear. If the rotary can be converted with one make of equipment it is very likely that can be done using others. Regards Steve <a href="http://www.go-lpg.co.uk" target=_top>www.go-lpg.co.uk</a>

simon_egas_uk · #7 Post by **simon_egas_uk** » Sat Jan 27, 2007 7:55 pm

Steve & All I guess it’s possible; we did not do this so I am not sure of any difficulties. But I know you will remember our system is fundamentally different to most of the others on the market. We DO NOT have a fuel map nor do we have a hidden map. We use injector duration and event analysis to predict our injection times. This is fundamentally different to any other system. We also have EOBD software that allows our ECU to monitor fuel trims and recalibrate the SLY Gas Injection system in real time, again something that no other system can do. Coupled with the above we also have one if not the fastest injector on the market, which gives us very precise timing advantages. It would be nice to know if it were possible with other makes as I feel sure it probably is. My only concern is that usually our system needs little or no additional setup from the installer once the calibration at idle has been done, unlike may of the others which require a substantial amount of setting up time refining their fuel maps. Simon

simon_egas_uk · #8 Post by **simon_egas_uk** » Sat Jan 27, 2007 9:05 pm

Here they are Reducer, Solenoid, Pressure sensor & Filter top left ECU almost just out of view top right <img src="http://www.my90.co.uk/lpgforum/messages/898/3977.jpg" alt=""> Four outlet Matrix HD344 just behind suspension top mounting four injector pipes going to twin rotors. <img src="http://www.my90.co.uk/lpgforum/messages/898/3978.jpg" alt=""> Cramped, small hands and tools required !

six_impressive_hours · Mon Jan 29, 2007 9:36 am

Nice one - thanks for the help <IMG SRC="http://www.my90.co.uk/lpgforum/clipart/happy.gif" ALT=":-)" BORDER=0> Might see an RX8 on gas in Northern Ireland then sometime! jamesy

philmanns · #10 Post by **philmanns** » Fri Jun 10, 2011 8:17 am

I can confirm having had our rx8 converted by Simon at Egas / Hardys that it is a successful conversion. Ours was converted at 57,000 miles and has now covered 91,000 with no issues other than now being well overdue for an LPG service! We get around 150 miles to the tank currently costing around £30 to fill whereas we'd get about 220 miles on £75 of fuel.

Phil

philmanns · #11 Post by **philmanns** » Fri Jun 10, 2011 8:20 am

I can confirm having had our rx8 converted by Simon at Egas / Hardys that it is a successful conversion. Ours was converted at 57,000 miles and has now covered 91,000 with no issues other than now being well overdue for an LPG service! We get around 150 miles to the tank currently costing around £30 to fill whereas we'd get about 220 miles on £75 of fuel.

Phil

stype3 · #12 Post by **stype3** » Sun Jun 12, 2011 4:14 pm

Hi, if you check on the mazda rotary forums, you will see that this sort of conversion does get done fairly often, more so with RX-7s than RX-8s, where mpg was usually in the region of 18-20, and after market CPUs for controlling boost as well as ignition timing and injection are the norm.
The rotary engines need something different than fully sequential injectors; and their effective capacities are a lot larger than their swept volumes; depending on the porting you are looking at duties of 100HP per injector for normal tuned 13B engines. for the wildly tuned, and turbocharged engines you could easily get 250 plus HP.

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