Member Since: 02 Jan 2015
Location: pontyclun
Posts: 433
9 MPG
Ive recently bought a 2004 4.4 v8 HSE with LPG conversion.
Ive read that people have been getting low 20's to the gallon which i thought was fine.
However, Mine is doing 9 - 13 mpg. Im driving as careful as i can and its still shocking. Monitoring this by the vehicle and a fill up app.
Air filter is brand new and inlet is all clean.
Read that tyre pressures front 38 and rear 40 psi helps improve
The mpg. But this just showed me what 2.7 ton's does when it slides. Complimentary wipe was needed.
Any ideas on how to solve this ?
14th Jan 2015 12:11 am
doz
Member Since: 15 Jun 2014
Location: Southampton
Posts: 436
I think what lpg system you have fitted will make a difference, also around 15-20% drop when running on gas should be expected but plpg still sounds shocking. Ive got an old P38 4.6 running gas here and i get around 18mpg. I've fitted and mapped a couple of lpg cars now maybe thatsthe problem it's not set up right. See if you can find out what kit is fitted, when it was fitted and how many miles it's done since fitting. Sometimes gas injectors wear and leak gas into the manifold. Lots of variables but need more info before we can narrow it down
14th Jan 2015 12:21 am
yaxman
Member Since: 02 Jan 2015
Location: pontyclun
Posts: 433
Brc lpg system. Fitted mid 2012.
Not sure on mileage. Not alot though.
I came back once and the inside smelt of gas. I spent ages looking for leaks and covered everything in a soapy solution and nothing. Never had the smell appear again.
14th Jan 2015 12:25 am
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26742
I used to run a V8 D2 on LPG. With normal use, it did around 12 mpg.
14th Jan 2015 12:27 am
doz
Member Since: 15 Jun 2014
Location: Southampton
Posts: 436
Well you've got one of the best systems fitted on the market, that and Prins but the problem you have is they don't allow Jo Bloggs access to the software to map it. They only let fitters/garages who arnt allowed to fit any other make of kit. It maybe worth finding a local BRC agent to service it and give it the once over. The gas in the cabin is a concern but sometimes it can just be some old gas which has flashed off in the manifold and managed to find a way out
14th Jan 2015 12:37 am
Dusty
Member Since: 23 Sep 2013
Location: London
Posts: 1022
What mpg are you getting on Petrol? Always best to investigate that side first so you can narrow it down to the LPG system. Ignition system has to be spot on to maximize LPG economy. Have a look at MAF sensor, plugs and leads first. Sometimes the simple things do the job.
Having run many V8 RR's (Never a D3) on gas, around the houses 12 mpg was the norm, getting up to 18ish on a run. With a D3 being even less aerodynamic than a RR I'm guessing it wouldn't fair any better in the economy stakes, although LPG mated to the 4.4 Jag engine might be an improvement over the old 4.6 in the P38 and the BMW engine in the L322.
Because you need more gas to achieve the same bang as petrol I've never really found a lot of difference when either 'pushing on' or driving like Miss Daisy when it comes to MPG. I used to draw satisfaction from the fact that when you bury the go pedal in the shag pile, it is a far more enjoyable experience than the artificially induced experience you get with a Diesel. The reality is you are never going to achieve half price motoring running a V8 on gas.Discovery 4 HSE
SDV6
2015
14th Jan 2015 4:16 pm
astonbuilder
Member Since: 29 Sep 2006
Location: MIDLANDS
Posts: 8079
Disagree that LPG isn't 'half price motoring', or certainly getting close to in my experience. My D2 4.0 V8 was doing around 18mpg over all. Working it out brim-to-brim on both LPG and gas costs over a period of time (car starts in petrol mode from cold for few minutes/mile or so) I'm sure, cost wise, mine was returning equivalent of about 28 mpg or so, whatever it was it was way better performance (economy, speed and driveabilty) than the poor diesels.....
I'd never have a diesel D2 again but I'd have a V8 LPG anytime if one turned up at decent price
14th Jan 2015 5:04 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Until one of the liners drops
Of course the TD5 engine is perfect you understand!
14th Jan 2015 6:26 pm
astonbuilder
Member Since: 29 Sep 2006
Location: MIDLANDS
Posts: 8079
I've had many 'Rover' and Jag' V8's over the years and never had a 'liner drop', don't think I even know anyone who has?
Anyway you can't worry about what 'may' happen or you may as well go live in cave......
14th Jan 2015 6:31 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
My mates into his rover v8s and hes had quite a few problems with them, incl dropped liner and an internally cracked blocked both different engines, cant remember if they were 3.5 or 3.9 hes had quite a few, 110 snatch is his latest one
But after being in the D3 a few times he may have seen the light and can start fixing tdv6 engines instead!
14th Jan 2015 6:45 pm
Dusty
Member Since: 23 Sep 2013
Location: London
Posts: 1022
I first had an LPG vehicle 10 years ago and in that time the price per litre of LPG has always been more than 50% of the cost of petrol, currently 62p for LPG and £1.05 for Unleaded at my local station. Factor in it's approx 10/15% less mpg on LPG, cold starts run on petrol and the extra cost of maintenance and an LPG V8 will never be 50% the cost of a petrol only V8.
Some say running an LPG V8 will have similar running costs to a Diesel D3, but having run an LPG RR and Diesel D3 side by side for the last 14 months, in my experience the D3 is still cheaper to run. That's worked out on brim to brim fills on both and routine maintenance.
I love V8's and LPG will certainly soften the blow, but for convenience of use I've turned into a bit of an Oil burner these days Discovery 4 HSE
SDV6
2015
14th Jan 2015 6:50 pm
Mogwyth
Member Since: 03 Oct 2014
Location: Pwllheli
Posts: 3976
Mixed motoring and I am getting 17.6mpg on Petrol and 15.3 on LPG, which means even with the current price drop on diesel I am still getting about 26mpg cost equivalent. Servicing for the LPG system only costs me £50 pa, other servicing I do myself.
And yes dropped liners do exist, my DII dropped a liner and ended up being a 4.6 as result
Bill==================================
05 D3 HSE V8 4.4
04 MG TF 135
03 MG TF 115 Cool Blue Edition
02 MG TF 160
00 Hymer B564 Lionheart
1971 Series III 109
15th Jan 2015 12:15 am
yaxman
Member Since: 02 Jan 2015
Location: pontyclun
Posts: 433
What do you get done the the lpg system servicing side of things?
15th Jan 2015 6:33 pm
Mogwyth
Member Since: 03 Oct 2014
Location: Pwllheli
Posts: 3976
Not a lot really, safety check, filters changed and emissions test.==================================
05 D3 HSE V8 4.4
04 MG TF 135
03 MG TF 115 Cool Blue Edition
02 MG TF 160
00 Hymer B564 Lionheart
1971 Series III 109
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