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SPIKES
Riding on 13's
Joined: 28 Nov 2007
Tech posts: 3
Location: arima
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 Posted: Sat Jul 12, 2008 11:42 am
Post subject: QG 18 ?? |
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| could a QG18 direct injected engine be converted to fuel injected if so what do i need to get and would the same brain be used . reason for this is that i want to put on a cng kit and it cannot work on direct injection only fuel injected |
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Nissan QG15DE
I LUV THIS PLACE
Joined: 18 Jul 2006
Tech posts: 1093
Location: San Fernando/ Cross Crossing
My 2NRide: Nissan Y11 AD WAGON
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Posted: Sun Jul 13, 2008 12:08 pm
Post subject: Re: QG 18 ?? |
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| zantopec wrote: | | could a QG18 direct injected engine be converted to fuel injected if so what do i need to get and would the same brain be used . reason for this is that i want to put on a cng kit and it cannot work on direct injection only fuel injected |
I think someone asked this similar question on tuner concerning brain and parts of a QG18DD and a QG18DE. they use different brain and some parts of the engine are different. (meaning- some parts are not interchangeable on the diesel and gas QG).
And it is easier to switch gas to diesel than diesel to gas (much difficult). Someone on tuner has the information u need, i can't remember who...anyone willing to help out? |
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Strugglerzinc
3NE2NR is my LIFE
Joined: 01 Jul 2005
Tech posts: 752
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Posted: Sun Jul 13, 2008 5:44 pm
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the compression ratios on a diesel and gas engine are very different ^^
the QGDD he refering to is'nt diesel. it is gas direct injection (doh kill me if ah wrong)
in that case the compression would be different again to the normal QG. |
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SPIKES
Riding on 13's
Joined: 28 Nov 2007
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Posted: Sun Jul 13, 2008 11:47 pm
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the engine i am enquiring about is a gas engine direct injection and not diesel.
the QG18 engines come gas fuel injected or gas directed injected |
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Nissan QG15DE
I LUV THIS PLACE
Joined: 18 Jul 2006
Tech posts: 1093
Location: San Fernando/ Cross Crossing
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Posted: Mon Jul 14, 2008 1:23 am
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Phew! i always knew it was gas but i got confused when on another forum a guy said he has a QG18DD diesel.
Sorry, i really got confused |
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david_nissan
Riding on 13's
Joined: 14 Jul 2008
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Posted: Mon Jul 14, 2008 2:04 am
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Hi all,
I'm new bie here, i own a nissan mitsuoka ryoga with qg18dd two months ago, just recently find out the car is lack of power especially from 0-40km and high fuel consumption, i.e full tank petrol only can clock 320km after the warning light up. i still remember before that full tank (normally i fill up 45 liters after a fuel light comes up)can clocked 450km. Is that any wear & tear parts have to replace ?
Any solution can overcome this problem?
Thank in advance for your all advise.
David// |
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Strugglerzinc
3NE2NR is my LIFE
Joined: 01 Jul 2005
Tech posts: 752
Location: Out There........Thatta Way.
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Posted: Mon Jul 14, 2008 2:18 pm
Post subject: |
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| zantopec wrote: | the engine i am enquiring about is a gas engine direct injection and not diesel.
the QG18 engines come gas fuel injected or gas directed injected |
 both is fuel injected chief just different methods of injection. DE is multi port FI and the DD is direct FI.
i'm guessin that the heads and intake manifolds would be different in both cases. not to mention the ECUs and i think (THINK not know) the DD requires a higher fuel pressure to facilitate the direct injection so the fuel delivery system might be different as well.
Cant say if a conversion can be done but it looks like it may be tough. |
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SPIKES
Riding on 13's
Joined: 28 Nov 2007
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Location: arima
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Posted: Mon Jul 14, 2008 10:20 pm
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| keep the advice coming thanks |
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biggy82
3NE2NR Diesel Boyz
Joined: 14 Aug 2007
Tech posts: 146
Location: far, far away.....
My 2NRide: Nissan D40 Navara
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Posted: Tue Jul 15, 2008 2:19 am
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| Strugglerzinc, you are correct. GDI (DD) is higher pressure, sometimes as high as diesel fuel line pressure in CFR. therefore the delivery system will more likely than not be different. |
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Strugglerzinc
3NE2NR is my LIFE
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Tech posts: 752
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Posted: Tue Jul 15, 2008 8:55 am
Post subject: |
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| david_nissan wrote: | Hi all,
I'm new bie here, i own a nissan mitsuoka ryoga with qg18dd two months ago, just recently find out the car is lack of power especially from 0-40km and high fuel consumption, i.e full tank petrol only can clock 320km after the warning light up. i still remember before that full tank (normally i fill up 45 liters after a fuel light comes up)can clocked 450km. Is that any wear & tear parts have to replace ?
Any solution can overcome this problem?
Thank in advance for your all advise.
David// |
Full service with TB and injector cleaning would be a good starting point.
MAF and O2 sensors may have to be looked at in worst case scenario. |
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Knight1
TriniTuner WHOoRE
Joined: 17 Aug 2005
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Location: On terra firma
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Posted: Tue Jul 15, 2008 9:16 am
Post subject: |
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| Quote: | I think someone asked this similar question on tuner concerning brain and parts of a QG18DD and a QG18DE. they use different brain and some parts of the engine are different. (meaning- some parts are not interchangeable on the diesel and gas QG).
And it is easier to switch gas to diesel than diesel to gas (much difficult). Someone on tuner has the information u need, i can't remember who...anyone willing to help out?
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Jeezzzzz......
QG18 DIESEL???? !! It's Gasoline Direct Injection.
| Quote: | | could a QG18 direct injected engine be converted to fuel injected if so what do i need to get and would the same brain be used . reason for this is that i want to put on a cng kit and it cannot work on direct injection only fuel injected |
It's very difficult to convert. For starters, the fuel systems are RADICALLY different. The QG18DD's fuel pump puts out 10 X more pressure than a standard fuel pump (or so my mech tells me) as the injectors are injecting fuel DIRECTLY into the combustion chamber. The pumps themselves are also not physically interchangeable. Also, IIRC, the compression ratios are different, and the heads are different. The throttle bodies are also different (the QG18DD has some kinda "dual entry" per cylinder kinda business going on there , and the QG18DD also has DBW (E-throttle - no accelerator cable), whereas the standard QG18DE (older ones) are cable -throttle.
Changing that engine to CNG is ludicrous (can't believe people still use CNG!!!).
You're better off swapping to a standard QG18DE and doing your CNG conversion.
But honestly....yuh kinda moving backwards with the technology there eh.........  |
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david_nissan
Riding on 13's
Joined: 14 Jul 2008
Tech posts: 5
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Posted: Tue Jul 15, 2008 9:27 pm
Post subject: |
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| Quote: |
Full service with TB and injector cleaning would be a good starting point.
MAF and O2 sensors may have to be looked at in worst case scenario.
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Strugglerzinc,
Thanks for your prompt reply, are the TB and injector part need to be clean regulary? actually what is the life span for MAF and O2 sensor? i found out from 0km to 40km the car running reponse not very smooth then felt that engine perform quite heavy and a bit of jerking during acceleration. how to slove the above symptom?  |
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Nissan QG15DE
I LUV THIS PLACE
Joined: 18 Jul 2006
Tech posts: 1093
Location: San Fernando/ Cross Crossing
My 2NRide: Nissan Y11 AD WAGON
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Posted: Wed Jul 16, 2008 12:40 pm
Post subject: |
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| check your engine/ transmission mounts. Once bad you will get jerks especially when gears change or u jump off the gas pedal when car is building up and u mash brakes. |
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david_nissan
Riding on 13's
Joined: 14 Jul 2008
Tech posts: 5
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Posted: Sun Aug 03, 2008 10:51 pm
Post subject: |
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| CVT gear oil = NS-1, what is the rating?? GL4+ or GL5+? |
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david_nissan
Riding on 13's
Joined: 14 Jul 2008
Tech posts: 5
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Posted: Fri Aug 22, 2008 5:31 am
Post subject: |
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| Gear oil, engine oil . pls commend.... |
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Knight1
TriniTuner WHOoRE
Joined: 17 Aug 2005
Tech posts: 1365
Location: On terra firma
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Posted: Fri Aug 22, 2008 8:29 am
Post subject: |
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Gear oil - what tranny do you have? Model year of car? If it's a 99-01 car w/ CVT, you should prob. be using NS-1 fluid only.
engine oil.....pretty much any oil works fine with these once the car's maintained properly. I've used Castrol GTX and Castrol Syntec Blend with good results so far. |
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Aimar
3NE 2NR for life
Joined: 12 Nov 2004
Tech posts: 149
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Posted: Fri Aug 22, 2008 3:11 pm
Post subject: |
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hey i have some problems with Qg18de... need to switch the brain...I.E try a different one that works normal and see if the problem stops...
CAN ANYONE HELP ME OUT WITH THAT 
PLEASE...problem going on 4 more than 3yrs now and no one can figure it out so it might be the brain  |
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