Thread: D-gas versus Dieselgas

Originally Posted by PAT303

Paul were are the boost valve and gas feed valve?.Are they reading correctly?.I think the reason you aren't getting power is because you aren't feeding it enough gas.I would change to a 40thou jet.My defender is booked in to be dynoed on the 8th,I also am getting it tuned in both diesel and gas to get it right.Two power runs and a tune for $250.I will post up results but I wonder if a good tune is what most of these vehicles need,I had the disco done when I fitted the gas,it turned it right around. Pat

Oh, and yes Pat, I did extensively test with both 45 and 40 jets. With the 45 it still made the engine noisy, and may have done with the 40 - very hard to be certain above the odd other Land Rover noise! As they say on the D-gas website, you can be doing damage before you hear the knock so I wouldn't regard the 40 as safe given the knock was clearly audible with a 45. Besides, even with the 45 there was really very little improvement at full throttle. Nothing I could measure with the stop watch, but I fancied I could feel a slight difference when I turned the gas on.
Cheers, Paul

Originally Posted by Wilbur

Pat, what worries me is the huge variation in percentage gas use. Even if it could be tuned to give a performance boost, I would constantly be worried about it over-gassing and destroying the engine.

The 300tdi is a glorious engine, and mine has only done 129,000 k's. It is quiet, smooth and economical with excellent performance for a 2.5 litre. My camperback is heavy though with 2 spares, 140 litres of fuel, 120, litres of water etc., and a bit more power would be wonderful, but not if there is a risk of damaging the engine. The way the gas usage varies, I wouldn't trust it an inch.

Cheers,

Paul

Do you have an EGT fitted???

Originally Posted by isuzurover

Do you have an EGT fitted???

Hi, Yes, I do, but it is an analog one so very small differences may not be noticed. As far as I could tell, there was no temperature difference between gas on/gas off at full throttle up the same hill starting at the same landmark on the bottom at 90KPH in fourth gear.
Cheers, Paul

Wilbur I can't hear any knocking at all in my engine at any stage.Why I asked about the valves is that if the boost valve is not reading the correct boost that could be the reason behind the inconsistant gas usage.I find it hard to believe that three control boxes have been faulty.My boost valve is tapped into the ridgid intercooler pipe and the feed valve is into the intercooler outlet flange.Personally I would give it a dyno tune and find out what is coming out the pipe. Pat

All I can say is that I drove the same hill everyday for 6 months without the gas - and I had to stay in the slow lane and hope no one pulled out in front of me just to hold 100kph. With the gas - I didn't need my foot flat to hold 100kph ( or higher) . The other hill is just out my driveway - without gas, it's first gear all the way foot flat, with gas I can change up to second 3/4 of the way up.

I have a 300Tdi with 320,000km on it and run 265/75x16 tyres. Like I said I can't say I'm entirely happy with the fuel consumption claim of saving 20% or more , it seems to substitute diesel for gas so cost were down.

Iain

Originally Posted by Wilbur

Interesting Iain, thanks for the reply. The seat-of-the-pants dyno is fine - but did you feel it while on full throttle? There are many reasons why a particular hill might stop you at 100KPH one day and 120KPH the next day.

l

I have dieselgas fitted to my 300tdi Defender and I am amazed at the difference it has made. Avery good increase in usable power, Ease of highway cruising coupled to a diesel use of better than 8l/100k highway running and around 8l/100k city driving. I couldn't be happier.

Originally Posted by jx2mad

I have dieselgas fitted to my 300tdi Defender and I am amazed at the difference it has made. Avery good increase in usable power, Ease of highway cruising coupled to a diesel use of better than 8l/100k highway running and around 8l/100k city driving. I couldn't be happier.

Wow, I would kill for results like that! Which gas system do you have, and where was it installed? Cheers, Paul

Originally Posted by PAT303

Wilbur I can't hear any knocking at all in my engine at any stage.Why I asked about the valves is that if the boost valve is not reading the correct boost that could be the reason behind the inconsistant gas usage.I find it hard to believe that three control boxes have been faulty.My boost valve is tapped into the ridgid intercooler pipe and the feed valve is into the intercooler outlet flange.Personally I would give it a dyno tune and find out what is coming out the pipe. Pat

Hi Pat,

D-gas did finally admit they had a problem with a seal of some type that was made of the wrong material and prevented gas flow through the solenoid in the control box. The first two boxes had the duff seal material, but they didn't admit there was a problem until they had made me do lots of tests and general farting around.

I am just over it now and just want it removed. I am sick of carrying around dead weight.

Cheers,

Paul