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Discussion Starter #1
Hey guys just chasing some or your opions and if this sounds about right to you guys..

I own a 05 model GU DX TD42 intercooled ute. It has 35" tyres, 3" lift, 3"exhaust and a HPD Intercooler that fits on to the original brackets for the standard one. I have also wound the boost up to 15 PSI everything else is standard. I use it to drive to work which is roughly 470kms one way, I sit on 100 - 110 kph. I fill up each time i leave home and when i leave work and roughly put in 83ltrs each time and only seem to be getting 450-500km out of the main tank and there is no weight on the ute just my tool box on the back with my bag in it.. is that about right for fuel usage on ?? When sitting on 100kph it is also on full boost even on a flat secton of road so i dont know if this is normal either.. and the egts never go above 400, they sit on about 350 when crusing at 100kph and only climb to round 400 if i am going up a hill or holding my foot to the floor over taking.

so just some advice if this all sounds about right to you guys.

cheers Scott
 

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GHMBC #3
nissan patrol gq lwb,3"lift.
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500 k is 16.6 ltrs per 100 k
450 k is 18.4 ltrs per 100 k

seems ok with 35's and 3" lift and yr egt is fine

are the 35's big mud tyres? try some at 33's to compare
 

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GHMBC #3
nissan patrol gq lwb,3"lift.
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I'm afraid that driving 470km one way to work is actually very far from normal.:D



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hahaha thats funny, unless you are a miner or someone on roster

Scotty5 i don't know about being on boost all the time.i would guess maybe yr turbo is a bit small but shouldn't hurt it- just use more fuel.try bleeding off a lb or 2 of boost.is yr exhaust clean or is it black smoke?
 

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Discussion Starter #6
I'm afraid that driving 470km one way to work is actually very far from normal.:D



.
ahah 470km is normal i use to do 726km one way to work.. but yea i do roster work ahah..

and i am pretty sure it doesnt blow any smoke at all when up it that i know of had a mate following me to work he said he didnt notice any smoke so its all good there and the turbo is just the stock one.. but thats for the feed back and help.. cheers
 

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nissan gu td42ti
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You could prolly get better results than that. I noticed that GU4s are really conservative with their factory tune. Or should I say that anything that is not working at its optimum tends to drag the chain. Like fuel and air filters dirty, injectors not serviced etc. To me it doesnt sound right that you are at full boost at 100ks. I found a huge difference in fuel economy between 100 & 110. Our trucks are not the most aerodynamic things on the road lol.

You are driving bigger tyres too so they will load the truck up more. Maybe check your air pressures & make sure they are rotated. once the muddies start scolloping they slow the truck down.

You might be worth taking it in for a proper tune on the dyno by a specialist to get the truck to drive efficiently. At least thats what I would do.
 

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Discussion Starter #9
Are you driving into a headwind when it's on full boost ?
sometimes but even when not driving into a head wind still on full boost. feels like i nealy have the foot to the floor but it has a little bit left but not much..
 

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Discussion Starter #10
You could prolly get better results than that. I noticed that GU4s are really conservative with their factory tune. Or should I say that anything that is not working at its optimum tends to drag the chain. Like fuel and air filters dirty, injectors not serviced etc. To me it doesnt sound right that you are at full boost at 100ks. I found a huge difference in fuel economy between 100 & 110. Our trucks are not the most aerodynamic things on the road lol.

You are driving bigger tyres too so they will load the truck up more. Maybe check your air pressures & make sure they are rotated. once the muddies start scolloping they slow the truck down.

You might be worth taking it in for a proper tune on the dyno by a specialist to get the truck to drive efficiently. At least thats what I would do.
yea ahah they def not the best for aerodynamics.. air pressurse are running at 36PSI in the tyres. I just put a new air filter in so that one should be all good, but i think i will have to get it tuned properly to see if it helps. i have not done the injector or anything since i have had it and i have only done 45 000km since i have had the ute. i think it has 187 000km on the clock so its probly near due for new ones or get the old ones cleaned..

thanks for ur help and advice i will see how i go with it and keep ticking things off the list to do..
 

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nissan gu td42ti
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Good idea mate. Sounds to me like you don't have enough fuel. Either injectors or fuel pump needs to be set up better. If your Egts are only 400 at full throttle then to me that would mean it needs more fuel.
 

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Discussion Starter #12
Good idea mate. Sounds to me like you don't have enough fuel. Either injectors or fuel pump needs to be set up better. If your Egts are only 400 at full throttle then to me that would mean it needs more fuel.
yea i can go up a hill in 5th flatout and reach 400 410 maybe even knock it back to 4th and be flat up the hill and still get to 400.. so def needs someone to tune it and play round with it and check a few thing i would say..

if i had the money now i would be doing a ufi 18g turbo 12mm pump and the bigger crack injectors..and 4" snorkel.
 

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I own a 2002 4.2t, factory turbo, no intercooler, 3 inch exhaust, plus wide tyres.
We just did a trip to Melb and back from Jervis Bay NSW with a twin axle box trailer, car and trainer loaded with tools,ladder, wheel barrow etc. on the way down sat mostly on 110 and on the way back on 100k. Fuel consumption, down was 16.8 and return 16.5. lt/100k
Considering the load i"m ok with that :)
 

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It's not normal..I used to get that towing.

My bet is that when you installed the boost gauge or intercooler someone forgot to reattach the pressure line to boost compensator.
 

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Have you checked the gauze filter on the injector pump? Pretty easy to check and tick off the list.
 

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Discussion Starter #16
It's not normal..I used to get that towing.

My bet is that when you installed the boost gauge or intercooler someone forgot to reattach the pressure line to boost compensator.
i did all the install stuff my self with the boost gauge and intercooler, as far as i know i hooked it up all right i shall take a few pic for you tomorrow. if you have any pics of the boost compensator.. can u post and i will see if i conected it back up properly..
 

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i did all the install stuff my self with the boost gauge and intercooler, as far as i know i hooked it up all right i shall take a few pic for you tomorrow. if you have any pics of the boost compensator.. can u post and i will see if i conected it back up properly..

The boost comp is on top of the fuel pump. There should be a small rubber hose that goes from the boot comp to somewhere along the intake after the turbo. Normally it's plumbed into the intercooler or crossover pipe. It's the line you normally tap into to get your boost gauge feed. You just need to make sure it's connected and not leaking off boost. When it's not connected fuel is pulled out and you'll be down on boost, fuel and power.
 

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Discussion Starter #19
The boost comp is on top of the fuel pump. There should be a small rubber hose that goes from the boot comp to somewhere along the intake after the turbo. Normally it's plumbed into the intercooler or crossover pipe. It's the line you normally tap into to get your boost gauge feed. You just need to make sure it's connected and not leaking off boost. When it's not connected fuel is pulled out and you'll be down on boost, fuel and power.
ok hada quick squiz this morning and i have run it into the boost comp, but at the tee pieace the fitting was not very tight so i tightened that back up to tight again.. but the like running to the boost gauge can spin so i think it could also be leacking sligghtly there as well.. i will pull it appart when i get home tomorrow night from work cut the line and redo it again make sure its all good..might even go get a brace tee pieace sincei am only using the plastic one that come with the boost gauge.. thanks timo_ed for the info its helping me tick things off..
 
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