TD 4.2 Diesel Gas conversion???

Submitted: Saturday, Mar 19, 2011 at 09:29
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Hi All , I've had a look at some past posts on this subject that are a few years old and would be interested in hearing from people that have actually had this done with their thoughts and comments a few years on.
I'm interested in the increase in power and whether the conversions have caused anyone grief.

Your feedback and comments would be greatly appreciated.

Cheers
Alex B
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Reply By: Rossc0 - Saturday, Mar 19, 2011 at 15:17

Saturday, Mar 19, 2011 at 15:17
We have a 93 Ford Maverick with TD4.2, DTS turbo, intercooler and Dgas fitted.

The difference with the dgas on is quite significant in terms of power and fuel consumption.

With dgas off (or we've run out of gas) the acceleration is quite sluggish and no feeling of increase in power when the turbo boost kicks in fully.

With dgas on it does not activate until the turbo boost is above a certain level and when it does you can feel the increase in power under acceleration.

Fuel consumption with dgas on is about 12.5l/100km and about 14l/100km without it.

It was on the vehicle when we bought it and we have not changed the tune from what was there. Previous owner had originally installed it with a jet for the lpg double the size of the current one and power was "incredible" his words. Problem was it used three tanks of lpg to one tank of diesel, current set up is one for one.

I don't know how much they cost to install but if it's like the lpg installs on petrol engines you usually need to cover at least 100,000kms before breaking even.

Cheers
Ross
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Follow Up By: Member - Alex B - Saturday, Mar 19, 2011 at 16:37

Saturday, Mar 19, 2011 at 16:37
HI RosscO,
Thanks for the valuable information.
Much appreciated
Cheers
Alex
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Reply By: Member - Peter W (WA) - Sunday, Mar 20, 2011 at 00:52

Sunday, Mar 20, 2011 at 00:52
G'Day Alex B
I have a 1999 Nissan Terrano II 2.7TDI. I had D Gas put on it in April 2009 at 178109km. With all the rebates it cost me $600.
I've had a few problems but whether it was due to the gas or co incidental I don't know.
A few months after I had the gas installed I had the injectors serviced, I hadd'nt noticed a problem but it was getting on towards 200000km so I thought about time. They replaced the No 1 injector as the sensor on it had failed and cleaned the others. $1200 all up. Including $760 for the injector.
All was good for about 6 mths and then it started to miss which over a few months got progressively worse. I took it back to the people who serviced it and they could not fault the injectors or pump and said it was the wiring for the gas being taken from the injector timing circuit(or similar).
I took it back to the gas fitter who wired the gas differently. No change.
I then took it to a diesel injector place in Bunbury WA who couldn't believe that the first place had replaced the No 1 injector and not replaced the needles and nozels on the other injectors, no matter how good they looked.
They replaced them including on the No 1 injector and since then no problems.
$650.
The gas people gave me three venturies, 25, 30 & 35 thou. I experimented with the three and settled on the 30 thou which gives me a consumption of 20% gas to diesel which is what D Gas recommend.
The gas has given me a noticible increase in power, but hardly described as incredible.
Fuel consumption has gone from around 10.5 L per 100km to about 9.5L around town(Mandurah) to about 8.5 on the highway at 100kph.
The cars done just over 200000 km now and I reckon I've recouped the initial $600 out lay in fuel savings.
The oil does appear cleaner but I still change the oil and filter every 5000km.
Hope this helps.
Regards
Peter


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Follow Up By: Member - Alex B - Sunday, Mar 20, 2011 at 13:22

Sunday, Mar 20, 2011 at 13:22
HI Peter,
Thanks for going to the trouble to share your experience. As you mention, hard to tell whether the hassles you've had were a direct result of the Gas installation or just coincidence. Overall you sound happy enough with it now- so that's encouraging.

Thanks again for your reply
Much appreciated
Alex B
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Reply By: Member - Bruce C (NSW) - Sunday, Mar 20, 2011 at 10:45

Sunday, Mar 20, 2011 at 10:45
Hi Alex,

My story is similar to the other replies.

My vehicle, 96 turbo landcruiser 80 series,had gas on it when I got it but it did not perform. After getting the injectors and pump done I had the gas converter replaced and the gas computer reprogrammed by the guys who developed and sold my system and they tuned the gas system at the same time.

The difference is quite noticeable when on gas. I cannot give you fuel consumption figures as I have not bothered to record them with regard to the gas installation, only overall fuel figures. Vehicle weight is around 2.5 T and fuel around town is 11.5 and towing 2.2T van 17.5. These do not include gas as it only costs about $12 for a fill and that lasts about a tank and a half of diesel.

I recently had the motor (290,000K) rebuilt as I was chasing the 1HD FT tick. The rebuild did not get rid of the tick but during the rebuild a significant thing came to light.

The internals of the motor were extremely clean for any motor meaning that there was virtually no soot getting into the motor from the combustion process. This is good news for the oil.

The motor was running well before the rebuild and it is running slightly better now but that could be due to the mechanic who plucked the motor and replaced it fiddling with the fuel settings on the injector pump. I think the motor is being over fueled (diesel) now. This I have to adjust shortly. Was running perfectly before rebuild.

Oil changes were so clean I thought I could stretch services out to 10,000K instead of current 5,000K.

There is virtually no black smoke, unless you are really into heavy power such as towing up a long hill, coming from the exhaust when the diesel and gas are at the correct tune. Even then it was only minimal

In summary I would recommend diesel gas.
There are plenty of people who have a successful gas setup on their vehicles and most hardly talk about.

I've heard a lot of negative stories about gas and even from one of my nephews who is a Toyota mechanic but I have had gas powered vehicles for the last 15 years with never a problem in the engines. Have had a couple of gas problems but they were fixed cheaply.

Hope this info helps.

Cheers, Bruce.
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Follow Up By: Member - Alex B - Sunday, Mar 20, 2011 at 13:26

Sunday, Mar 20, 2011 at 13:26
Hi Bruce,

Thanks for taking the time to reply. It realy is about getting the right people to do the job.
Good to hear you would reccommend it.

Thanks again for the great info
Best regards
Alex B
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Reply By: hallmark1 - Sunday, Mar 20, 2011 at 19:42

Sunday, Mar 20, 2011 at 19:42
Hi Alex I have a 3ltr patrol(you know the the one that blows motors????)and it has done close to 200.000ks,I fitted d/gas at 110.000ks,i have had no problems with the setup,the extra power towing a 2.8 tonne caravan was incredible,have chip fitted but now turned off,oil stayed very clean so now changing every 10,000ks.
The system I fitted does not have a computer,and I dont know the brand unfortunately.
I use about 20% gas to diesel which I believe is about the right mixture.

Cheers Baz
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