To Anyone With LPG Conversion
Discussion
I had my Monaro converted to LPG over the "summer" and done several thousand miles on it since and generally it's working OK. Only ever so slightly down on power which is better than I expected, and costs pittance to run. There are just a few niggles though I was wondering if they are a common thing, or something with mine that needs addressing. The main ones are it isn't as smooth on gas as petrol which makes it jerky to drive slowly (not that this is often done 
) and probably related to the rev counter moving up and down 100rpm or so when idle. The other is when on long periods of overrun, such as taking your foot off the throttle when going down hill the check engine warning goes off for about 5 secs. Again, all is fine on petrol so I assume the car itself is OK.
Anyone experiences anything similar after a conversion? I know a few guys on here are running on gas.
) and probably related to the rev counter moving up and down 100rpm or so when idle. The other is when on long periods of overrun, such as taking your foot off the throttle when going down hill the check engine warning goes off for about 5 secs. Again, all is fine on petrol so I assume the car itself is OK.Anyone experiences anything similar after a conversion? I know a few guys on here are running on gas.
Had mine done this summer too (6 litre vxr). I have a BRC multipoint injection system with twin evapourators. I've had no issues with jerky running on gas, you really can't tell when its on gas or petrol.
I do however have the check engine light issue. My istallers have spent quite a long time trying to fix this and it seems to be to do with the long term fuel trims. They have succeeded in substantially reducing the amount of "binging" I have to put up with, but its not completely solved yet.
Have you had any fault codes read? I'm hopefully checking mine tomorrow to see what the car thinks is happening, then the gas guys can tune the gas system, so it stops doing it. I'm sure its solvable, because they've already improved it a huge amount.
I'd be very interested to hear if anyone else has had, this and found a fix.
I do however have the check engine light issue. My istallers have spent quite a long time trying to fix this and it seems to be to do with the long term fuel trims. They have succeeded in substantially reducing the amount of "binging" I have to put up with, but its not completely solved yet.
Have you had any fault codes read? I'm hopefully checking mine tomorrow to see what the car thinks is happening, then the gas guys can tune the gas system, so it stops doing it. I'm sure its solvable, because they've already improved it a huge amount.
I'd be very interested to hear if anyone else has had, this and found a fix.
I've got a BRC multipoint system on my 6 litre and it's performance on LPG / petrol is identical as far as I can tell. I think you'd need to put it on a dyno to tell any difference. No real power loss and no jerkyness.
I do have the check-engine issue triggered by the "long term fuel trim (bank 2)" or some-such, but I've not gotten around to going to the converter for a tune yet as it doesn't happen that often. It tends to happen if I start the car shortly after stopping it (fully up to temp).
I do have the check-engine issue triggered by the "long term fuel trim (bank 2)" or some-such, but I've not gotten around to going to the converter for a tune yet as it doesn't happen that often. It tends to happen if I start the car shortly after stopping it (fully up to temp).
I've got a BRC multipoint system on my 5.7 litre which was fitted 25000 miles ago. It's performance on LPG / petrol is nearly identical as far as I can tell. You would need to put it on a dyno to tell the 10 HP difference. No real power loss and no jerkyness. No fault codes that I am aware of, certainly none in the last 10,000 miles since I bought the car
leaf blower said:
Where are you gas tanks fitted? the boot is so small on my car, I was thinking of having the tank fitted in the boot
Usually they fit in the spare wheel well, and you carry a bottle of compressed foam around should you get a puncture, or go to a party and forget to take something to play with 
I get about 47 litres in mine which is does mean I need plenty of trips to fill up, but there are enough stations around for it not to be a problem.Incidentally after posting this thread I had a call from the guys who did my installation saying I should bring the car back for a 'tune up'. It's reassuring to know others are having the check engine problem too but they'll look into it. The guy I spoke too thought that the jerkyness could be caused by the engine using too much fuel and will probably just need a tweak to the mapping.
The only time mine was jerky was when one of the injectors failed. The symptoms were a horrible judder felt through the front wheels. The engine firing on 7 cylinders gave me a misleading sense that the power hadn't dropped at all and the engine was okay. Ignore that at your peril! Luckily there's a long warranty on injectors and it was replaced quickly for free.
For the rest of the 50k miles I've chalked up with the lpg kit, it's driven really well with only one random 'Check Engine' warning (touch wood to all this now that I've said this).
The only time power is an issue is when you're overtaking at exactly the point the gas runs out - and that's very easy to recover from - about a half second of power fade.
Max donut tank size you can fit into a CV8 spare wheel cavity is 60L with 48L max fill capacity
For the rest of the 50k miles I've chalked up with the lpg kit, it's driven really well with only one random 'Check Engine' warning (touch wood to all this now that I've said this).
The only time power is an issue is when you're overtaking at exactly the point the gas runs out - and that's very easy to recover from - about a half second of power fade.
Max donut tank size you can fit into a CV8 spare wheel cavity is 60L with 48L max fill capacity
Not quite the same car (I had a Prins system on BMW 330) but can relate to the 'jerkiness'. It drove me mad in the beginning and I was in few times for tweaks to the system. They said it was due to the Prins system having it's own ECU that would never be as well set up as the cars own Bosch ECU hence the throttle response would be different.
The main difference was in the 'anti-stall': in slow traffic on petrol I could gently let the clutch out (in gear) and the car would give itself enough juice to creep along and not stall. The lpg didn't do it quite as well but I learnt to drive around it.
That's my 2p worth.
The main difference was in the 'anti-stall': in slow traffic on petrol I could gently let the clutch out (in gear) and the car would give itself enough juice to creep along and not stall. The lpg didn't do it quite as well but I learnt to drive around it.
That's my 2p worth.
kjmac said:
bathcv8 said:
Max donut tank size you can fit into a CV8 spare wheel cavity is 60L with 48L max fill capacity
Pffft, I've got a 62L spare wheel tank 50L max fill in my 6.0
Either the VXR's wheel cavity allows 2 more litres in lpg tank space than a CV8 or I got duped by the sales guy
I had my VXR8 converted about 3 weeks ago; just coming up 1000 miles. I have the tank in the former spare wheel position in the boot floor.
I can tell little difference - except it costs ~£20 to fill up. I can fill about 48 litres, which lasts me just over two days of commuting (so a bigger tank would have been preferred). There may be some reduction in power but it is hard to tell when in traffic (maybe I have 400 bhp instead of 430 at max?!).
My system is BRC fitted by Greenfuel - the same as KJMAC. They are doing a promotion for October (now past I know) & November £1850 +VAT for 8 cyl vehicles.
I drive about 1 mile from cold before changeover.
Hope this help
Steve
I can tell little difference - except it costs ~£20 to fill up. I can fill about 48 litres, which lasts me just over two days of commuting (so a bigger tank would have been preferred). There may be some reduction in power but it is hard to tell when in traffic (maybe I have 400 bhp instead of 430 at max?!).
My system is BRC fitted by Greenfuel - the same as KJMAC. They are doing a promotion for October (now past I know) & November £1850 +VAT for 8 cyl vehicles.
I drive about 1 mile from cold before changeover.
Hope this help
Steve
Got LPG on another vehicle and get the jerkiness at lower revs/around town and when on cruise control.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
Trailermasher said:
Got LPG on another vehicle and get the jerkiness at lower revs/around town and when on cruise control.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
I too have two evaporators, but not two ECUs; are you sure that is correct? The evaporators (so I've been advised) will need adjustment after they 'settle in' and will be dealt with at 1k miles (imminently).
Any help...?
Steve
stevemj said:
Trailermasher said:
Got LPG on another vehicle and get the jerkiness at lower revs/around town and when on cruise control.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
I too have two evaporators, but not two ECUs; are you sure that is correct? The evaporators (so I've been advised) will need adjustment after they 'settle in' and will be dealt with at 1k miles (imminently).It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
Any help...?
Steve
When it was fitted, there were no 10 cylinder LPG ECU's available only up to 8 cylinders, so they used two, working 5 cylinders each.
Also have two evaporators and twin tanks
I'm getting mine checked over in a couple of weeks, I'll let you know if anything useful arises. I'll probably get the ECU's changed for a single 10 cylinder one and have all the electrics renewed.
Trailermasher said:
Got LPG on another vehicle and get the jerkiness at lower revs/around town and when on cruise control.
It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
Where do you guys get LPG for <50p/litre? Seems to be around 58p at the main petrol stations (Ipswich area)It's like it's either on or off - no balance in-between.
Does anyone know, can this be tuned out?
Have other problems with it, being a V10 it has 2 LPG ECU's that don't always cooperate. Sometimes runs 5 cylinders on gas, the other 5 on petrol, but 80 litres for £38 means I am willing to persevere.
Cheers
Jerry
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