TomX8

We tried it aswell with the same system you used just recently. They already saw early on during the install that it might not work as they couldn't read the RPM signal. They contacted the a british importer of BRC, the headquarters of BRC and other people who have this system in their RX. They said that it will run, but not as it should, so they rather stopped.

We knew that it's a different engine, and knew that failure was a possibility. I really wished it would have worked out, because BRC seems to really be one of the best systems around.

I have done some research on well running RX-8, and the only ones I could find were from STAG and they seem to run great. You can't tell the difference whether they drive on LPG or Benzin, atleast as far as you can see it in the video.

It's the same system that Anubis is using, and there was another british and a serbian RX-8 running on the STAG system, both shown by the installers. As Anubis has told me, it has a "Rotary/Wankel" mode in the STAG ECU which enables the system to run on the RX smoothly.

For the 2nd try I will go for the STAG system, and we will contact STAG beforehand to make sure whether and how it can be done on a Renesis HP.

cisjga

Hi everyone, I thought I might chime in as well. I have the high powered 231 6 speed manual and running on LPG 2+ years now. There are 2 options for successful conversion. 1 the JTG Icom which injects liquid gas straight into the rotors and does not require a piggy back ECU, you will actually get more power with this system than running on gasoline, the downside is that it is very expensive, the positive is increased power and all control is done by the factory ECU. I have a normal vaporizer system by Bigas which has its own ecu, so a piggy back that receives info through OBD and the factory ECU. In order however to maintain the full power output of the engine, ie no difference from gasoline in all aspects it is set up to enhance with gasoline at certain RPM between 2000 and 9000 and only under certain load. So when cruising it only uses LPG and when power is needed it supplements with gasoline. The savings are huge and there is no need for extra lubrication as gasoline that I premix is quite often supplied along with the LPG. The system is dirt cheap as well, it was tuned on a dyno, it took 2 days total and cost about 700 Euro. Car starts and runs great both hot and cold. Downside is a lumpy idle nothing major on lpg only and when starting from hot as it starts on petrol and then switches over to gas. The factory ECU learns the fuel trims on LPG at idle so it doesn't like gasoline at idle. I have personally tuned this to switch over in less than 5 seconds with a hot engine, once in LPG it runs fine. So no real biggy. In summer on very hot days and all accessories on acc etc it occasionally stalls, but I have narrowed that down to fine tuning that I will perform via laptop this summer. Other than that, its great. I highly recommend the conversion.

cisjga

oh, I have done 30000k on this system

TomX8

The AC STAG conversion was a success! Rx8 does fine. I also need to fine tune it with my own laptop.

cisjga

Does it use petrol enhancement or is it only using LPG in the whole RPM range?

Yiannis Tsarouchas

hi to all of you here!!

im a massive fun of rx-8 and im thinking of buying it but the consumption (10 ltr/100km/h) with petrol is too much and i was thinking to install a lpg...help me please...can i keep the rx-8 if i put lpg?

Brettus

iTrader: (2)

Firstly - good luck getting 10L/100km , that's pretty optimistic for an rx8. Secondly - do you realise that your consumption will be worse on LPG ?

Yiannis Tsarouchas

Worse in what language? Xd
Let's say that if i go 130 km/h and i doin at the max 16lt/km/h, with the lpg a good one with let's say over 1,500€, how litre per km/h will do.

Brettus

iTrader: (2)

I can't tell you exactly what the consumption will be but if you compare with a petrol engine the difference in consumption should be the same ............ roughly.

Aslo : it's L/km ....not L/km/hr .

Yiannis Tsarouchas

Oh okay
Also: yes and thank you!!

Ricky SE3P

iTrader: (10)

If you don't even yet own an Rx8 and you are already hesitating just at the cost of petrol, you shouldn't be buying an Rx8.

UnknownJinX

^Yep.

Conversion itself will cost quite a bit of money, and where do you plan on storing the LPG? I don't think the stock gas tank will do.

Buy a Miata if gas mileage is a concern.

Oh and yeah, driving more slowly on highways/motorways helps. I am not saying be the grandma in her Corolla, but 130km/h is pretty fast. Slow down, sport.

Tamas

iTrader: (1)

That's my regular traveling speed on the freeway

But yes, getting 10l/100km is a dream. More like 12 or 12.5 with this constant pace.

TomX8

Conversion costs 1500 euro. In europe, the difference between Euro 95 and LPG can be up to 1 euro. Given that one drives 15L/100km, the system is repaid in 10.000km.
I have a 45L LPG tank in my trunk. Took about 1/3 of by trunk or translated, it's a little bit more than a carry on luggage hardcase.
If I need more room, you can get a skibox. In any case, I always had plenty of space to take 4 people with me on international drives.
Consumption is worse because you will redline it every chance you get, mostly. Otherwise, I still managed to get to 260km on 35 liters, which translates to 13,5L/100km on highway driving at 130km/h.
Having to refuel often is a small price to pay to get great savings and invest those savings in a new engine. Mine got pulled apart at 110.000km, failure due to a clogged oil nozzle and otherwise wear and tear that dropped the compression to 4-4,5 bar. Internals looked otherwise fine after having driven for 10.000km on LPG.

Brettus

iTrader: (2)

Would recommend that you raise the omp rate at low load/rpm . I've learn't the hard way about the loss in lubrication quality when using ethanol . Same applies to LPG.

Nikos.Lc

Hello everyone. I'm looking to buying an RX-8 for a future "project car" but until then i want to use it first for weekend-drive.But I'm a student and don't have the money to throw on Petrol. With what I have heard, LPG could be one option to go but I have also heard that rotary with lpg don't go together. Can anyone here help me with that task. The difference in price is so big because in Greece petrol is 1.6e/ltr and lpg is 0.7e/ltr. and with the small consuption change of lpg the price/km of lpg is pretty much half of petrol.

Vasilis Bankai

Niko, file mou,

εχω lpg εδώ και 6000 χλμ. Rotaries και lpg πανε μια χαρά μαζί γιατί μειωνονται οι επικαθισεις άνθρακα. Καλή εγκατάσταση θες μονο.

i have been lpg for 6000 km. Rotaries and lpg have been fine together because carbon deposits are decreased. You'll need a good installation only.

sybreeder

https://www.youtube.com/watch?v=AzEw...ature=youtu.be

It's only in polish unfortunately. (Rotor on the left was used with LPG)
General issue is with too hight exaust gas temperature that will burn side seals. Unless LPG installation will accomodate that it's not recommeded to have LPG in RX-8

sinkas

does LPG actually increase exh temps?
,
I think there is a chance that engine s sdie seals was gummed up before it went on to lpg,

but aslo the " Dry-ness" of lpg might contribute to needing better lubrication

Vasilis Bankai

My friend, the only correct way to know what lpg does is to get a new engine and run it on lpg, then open it and see what's the situation inside. Also, my installation allows lpg to be used on low rpm and engine load (highway and city driving). High rpm or engine load use gasoline premixed. So the car starts with gasoline, goes to lpg once the correct coolant temperature is there and will go back to gasoline if i rev too high.

sinkas

so it computer managed?

Vasilis Bankai

Of course, there is programming involved. I also have a button to do it manually if I feel like accelerating hard.

UnknownJinX

Kinda reminds me of the hydrogen RX-8 that can also run on gasoline.

It's a bit of over-engineering to me... But I guess you do you.

Vasilis Bankai

Not as much as you think. It's part of the standard programming. This is as complicated as it gets.