efi gq - lpg and economy

Submitted: Tuesday, May 08, 2007 at 18:30
ThreadID: 45229 Views:3247 Replies:3 FollowUps:5
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Greetings, I've been searching the archives about GQ's and noticed that dual fuel efi gq's actually start on petrol then swap over to lpg (as opposed to carby models that can start on either). Some questions about this:

How long do they run on petrol before swapping over?
What size are the petrol tanks (under drivers seat?)?
Do efi models get better economy than carby ones?
What are the economy differences between manual and auto in an efi gq?

No doubt some of you will try to convert me to diesel, but the increased purchase price would buy a lot of fuel. Thanks. Rob.
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Reply By: Brew69(SA) - Tuesday, May 08, 2007 at 19:00

Tuesday, May 08, 2007 at 19:00
Lots of info here
AnswerID: 238628

Follow Up By: Robbg - Wednesday, May 09, 2007 at 12:10

Wednesday, May 09, 2007 at 12:10
Thanks Brew. I've now subscribed. Rob.
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Reply By: Dallas from Team Green Autogas - Tuesday, May 08, 2007 at 22:21

Tuesday, May 08, 2007 at 22:21
G'day Robbg,
Not all efi systems start on petrol & change automatically.
The systems that do normally only literally fire the engine on petrol & then change to lpg. It's almost instant.
The auxilary petrol tank that goes under the drivers side half way along comes in 2 sizes, 45Ltr & 70Ltr.
EFI vehicles normally do get better economy than carby ones. Not by much admittedly. Probably not a result of the lpg fuel system.
Auto's are generally 50 - 75 K's worse off.
The GQ normally gets around 350 - 400 K's out of the 92Ltr Usable LPG cylinder.
If you had a choice & you had your heart set on a GQ you'd go the EFI Manual.

Regards
Dallas
AnswerID: 238709

Follow Up By: Robbg - Wednesday, May 09, 2007 at 12:04

Wednesday, May 09, 2007 at 12:04
Thanks Dallas, it sounds like I could achieve a touring range of about 700kms with the 70 lit aux tank - 350 kms on gas and 350 kms on petrol if it had the 70 lit aux tank (assuming 20 lit/100 kms). I guess a staight petrol gq could achieve a slightly better range than this with standard petrol tank (85 lit?) plus the 70 lit aux - say 400 to 450 kms on main tank plus 350 on aux. 750 kms is way better than the 450 I currently achieve in my Jackaroo. Thanks again. Rob.
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Follow Up By: Brew69(SA) - Wednesday, May 09, 2007 at 20:27

Wednesday, May 09, 2007 at 20:27
My 4.2 Carby gets 425-450 on a tank of gas.(doesn't seem to change even towing the camper) And 350kms on my 70lt belly tank. I can carry another 80lt of ulp on the camper too.Mine is Auto.
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Reply By: ExplorOz Team - Kerry W (QLD) - Wednesday, May 09, 2007 at 00:09

Wednesday, May 09, 2007 at 00:09
Hi Robbg,
If your heart is set on a petrol GQ then sus out the 3 lit petrol (RB30) Its an unpopular motor in a Patrol, Mostly unpopular because its misunderstood and rarely driven correctly. (ie It needs to rev out to 4000+ rpm and will do it all day - likes a bit of premium ULP in the tank) These donks have been choked into oblivion for australian anti pollution regulations and hence quite cheap. Once you have the right one at the right price and the right Klms. Spend the saved money on - doing the head up, extractors, straight through exhaust, remove obstructions at base of carby have dizzy and carby serviced etc etc. Use the revs in 3rd and 4th rather than 5th gear when towing and it will still use the same if not less fuel.
Simple mods and tips will keep you happy performance wise and fuel economy wise.
Does approx 14-20 lit/100klm Also needs very little tuning as self adjusting tappets - Motor in a patrol if serviced correctly does approx 400,000-500,000ks even when revved freely. This motor is the high performance engine out of the Nissan Skyline and pushes a patrol very well once "fixed" -- Probably the way Nissan designed it in the 1st place.
(do a forum search on RB30s lots of info)
cheers

Kerry W
Kerry W (Qld)
Security is mostly a superstition. It doesnt exist in nature. Life is either a daring adventure or nothing.
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AnswerID: 238732

Follow Up By: Robbg - Wednesday, May 09, 2007 at 12:07

Wednesday, May 09, 2007 at 12:07
Thanks Kerry, I've noted a few concerns about the RB30 in threads I've read. Some have suggested that you have to push it so hard (esp. towing or in sand) that it consumes as much fuel as the 4.2 anyway. Also, concerns about the strength of the gearbox (again esp. for towing). It was a great engine in the Skyline and Commodore. Rob.
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Follow Up By: ExplorOz Team - Kerry W (QLD) - Wednesday, May 09, 2007 at 19:57

Wednesday, May 09, 2007 at 19:57
Yes Rob those concerns are valid for the standard un modified RB30s
Gearbox issues are rare but have been observed.
I was not saying you need one of these - thats for sure.
I just had to reply cause I had done lots of homework on these. I actually keep a 1991 RB30 in top shape for bush and beach because its lots of fun - and wait for it - it is so good in sand. (It goes like the clappers and sounds great.)
I dont mind if it gets a scratch, bumped or a bit wet, - cause it is so cheap to fix and maintain. Its being used for what is was designed for.
But you have DRIVE it.

Go with your feelings on this but if a really good one of these pops up you will either see potential or too much inconvienence. You really have to be totally happy with the vehicle you buy. You would need a very different style of driving and mindset to enjoy and really have fun with one of these.

cheers

Kerry W
Kerry W (Qld)
Security is mostly a superstition. It doesnt exist in nature. Life is either a daring adventure or nothing.
-Helen Keller

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