Notices
Series I Tech Garage The place to discuss anything technical about the RX-8 that doesn't fit into any of the categories below.

RX-8 LPG Conversion

Old 11-12-2015, 12:43 PM
  #51  
Registered
 
Join Date: Jun 2015
Posts: 191
Received 0 Likes on 0 Posts
Originally Posted by Suby_1996 View Post
Hi all,

Sorry for the long delay.

The gas conversion was a faliure, i was without my car for a total of 28 days having had 2 seperate gas systems fitted and even then they could not get it to run right, There was a delay in throttle responce from tickover which sometimes the rev's dropes so low it cut out, it would start back up but would automatically be on petrol then swap to gas and it was not a plesent swap over and between 4000 - 5000 reves it was seriously holding back, The 231 is a 6 port engine compared to the 192 which is a 4 port engine and they could not control when the two additional ports were going to open so as a result could not compensate with gas injection, I ended getting a full refund after i told the company to remove there system.

Sorry guys but it was worth a shot!!!!!
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.
TomX8 is offline  
Old 05-01-2016, 05:50 PM
  #52  
Registered
 
Join Date: Aug 2013
Posts: 70
Received 0 Likes on 0 Posts
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 is offline  
Old 05-01-2016, 05:53 PM
  #53  
Registered
 
Join Date: Aug 2013
Posts: 70
Received 0 Likes on 0 Posts
oh, I have done 30000k on this system
cisjga is offline  
Old 05-11-2016, 03:43 AM
  #54  
Registered
 
Join Date: Jun 2015
Posts: 191
Received 0 Likes on 0 Posts
The AC STAG conversion was a success! Rx8 does fine. I also need to fine tune it with my own laptop.

Last edited by TomX8; 05-11-2016 at 03:47 AM.
TomX8 is offline  
Old 05-12-2016, 06:22 AM
  #55  
Registered
 
Join Date: Aug 2013
Posts: 70
Received 0 Likes on 0 Posts
Originally Posted by TomX8 View Post
The AC STAG conversion was a success! Rx8 does fine. I also need to fine tune it with my own laptop.
Does it use petrol enhancement or is it only using LPG in the whole RPM range?
cisjga is offline  
Old 03-28-2019, 07:17 AM
  #56  
New Member
 
Join Date: Mar 2019
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
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?
Yiannis Tsarouchas is offline  
Old 03-28-2019, 02:51 PM
  #57  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 18,369
Received 245 Likes on 188 Posts
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 ?
Brettus is online now  
Old 03-28-2019, 02:57 PM
  #58  
New Member
 
Join Date: Mar 2019
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
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.
Yiannis Tsarouchas is offline  
Old 03-28-2019, 03:10 PM
  #59  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 18,369
Received 245 Likes on 188 Posts
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 .
Brettus is online now  
Old 03-28-2019, 03:16 PM
  #60  
New Member
 
Join Date: Mar 2019
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Oh okay
Also: yes and thank you!!
Yiannis Tsarouchas is offline  
Old 03-28-2019, 04:35 PM
  #61  
Certified Fumb Duck
iTrader: (10)
 
Xero Ryuu's Avatar
 
Join Date: Dec 2010
Location: Bakersfield, CA
Posts: 1,267
Received 49 Likes on 42 Posts
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.
Xero Ryuu is online now  
Old 03-28-2019, 05:01 PM
  #62  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 2,247
Received 326 Likes on 299 Posts
^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.

Last edited by UnknownJinX; 03-28-2019 at 05:03 PM.
UnknownJinX is offline  
Old 03-28-2019, 11:42 PM
  #63  
Registered Lunatic
iTrader: (1)
 
Tamas's Avatar
 
Join Date: Aug 2003
Location: SF Bay Area, California
Posts: 3,485
Received 11 Likes on 10 Posts
Originally Posted by UnknownJinX View Post
...130km/h is pretty fast.
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.
Tamas is offline  
Old 04-01-2019, 12:23 PM
  #64  
Registered
 
Join Date: Jun 2015
Posts: 191
Received 0 Likes on 0 Posts
Originally Posted by UnknownJinX View Post
^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.
Originally Posted by Xero Ryuu View Post
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.
Originally Posted by Brettus View Post
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 ?
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.
TomX8 is offline  
Old 04-01-2019, 02:58 PM
  #65  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 18,369
Received 245 Likes on 188 Posts
Originally Posted by TomX8 View Post
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.
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.
Brettus is online now  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JimmyBlack
Series I Major Horsepower Upgrades
270
03-06-2019 10:56 PM
Carbon8
RX-8's For Sale/Wanted
41
04-04-2016 04:05 PM
BillBertelli
NE For Sale/Wanted
4
03-19-2016 03:01 PM
Brokegang
New Member Forum
27
01-03-2016 12:45 PM
Tsurugi
New Member Forum
0
09-07-2015 08:27 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: RX-8 LPG Conversion


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.