more power for patrols

Submitted: Thursday, Apr 18, 2002 at 00:00
ThreadID: 986 Views:1479 Replies:4 FollowUps:4
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hey guys, i have a gq 2.8td, anyone else who has driven one will know they are fine once the boost is up to pressure (over 1800rpm), however taking of up a steep hill in first gear can be a slow process. so i need more power, i've had a snorkel and 2&1/2 high flow exhaust fitted which doesnt help much in the low rpm range, the next step is either an intercooler or work the turbo and injector systems, at the moment the i/c is out of budget, but i have had advice not to mess with the turbo to much or else its likely to cause troubles, has anyone done either of these, any advice for working the turbo or any other horse power tips? go the nissans. p.s how prone is the head to warping? does that only happen due to overheating? thanks.
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Reply By: Peter Moore - Thursday, Apr 18, 2002 at 00:00

Thursday, Apr 18, 2002 at 00:00
I have a GQ 2.8TD. Had an intercooler & snorkel fitted when i bought it at 40k and it seems to make a huge difference to what I here of them without the I/C
I have now done 80k been up& down the coast of WA a couple of times plus lots of beach work in the southwest. Never had any problems with heating and seems to have a fair amount of get up and go when climbing of from a steep start
Have been told not to mess with the turbo as if you increase boost. burnt valves will follow soon.
Don't know about the warped head as has not been a consideration for me.
AnswerID: 2935

Follow Up By: Andrew - Friday, Apr 19, 2002 at 00:00

Friday, Apr 19, 2002 at 00:00
thanks peter, i was always had concerns about playing around with the turbo, and an i/c has always been my preference, however the 2 grand i was quoted is a bit out of reach at the moment. did you put a bonnet scoop on? where does it get mounted, to the right of the turbo manifold? are the steep starts you talk about in high or low range, (low is obviously no problem for me)? i only heard about warped heads through this forum, aparently due to intense overheating. do you regard the front hub in the lock position as a true diff lock? if so i wonder why other people put airlockers on? andrew.
FollowupID: 1151

Follow Up By: Ted - Saturday, Apr 20, 2002 at 00:00

Saturday, Apr 20, 2002 at 00:00
Just a quick comment - the front hub locks have no effect on the diff and are not in any way related to a diff lock. They simply lock the front wheels to the front axles and prevent the wheels from spinning on stationary axles as happens on a 2wd vehicle.
FollowupID: 1155

Reply By: Peter Moore - Friday, Apr 19, 2002 at 00:00

Friday, Apr 19, 2002 at 00:00
I don't know the cost of the I/C as it was on the car when i bought it.
As for the mounting appearance it is mounted in front of the A/C condenser and radiator with pipes etc back injust above the turbo.
Looking at the car you cannot see it is intercooled until you lift the bonnet and take a closer look
When driving yeah it is a bit slow up to 1800rpm when you start off in 1H but above that can change up to the next gear no probs,
3rd is asking a bit much though on a good incline. I am happy with mine and yes you will not pull a 25foot van up a steep hill in top gear but driving within the vehicles capabilities it performs really well.
AnswerID: 2953

Follow Up By: Peter Moore - Friday, Apr 19, 2002 at 00:00

Friday, Apr 19, 2002 at 00:00
The rear diff is LSD(not the wacko stuff) and the front diff is like any other part time 4WD, if a wheel looses traction it will spin.
Diff lockeers work to supply the same amount of power to each wheel so the loose wheel will not spin any more than the one with traction
Hope this stuff helps
FollowupID: 1152

Reply By: andrew- Saturday, Apr 20, 2002 at 00:00

Saturday, Apr 20, 2002 at 00:00
hey ted, what is the advantage of the hub lock then, what is the diference between lock and auto, and when would it help you. i was told it did lock the diff, and whenever i have used the lock position i have found it to be a more capable climber over rocks or heavily rutted terrain than in the auto position,as well as that the turning circle seems to be alot bigger which you would expect if the front diff was locked. maybe it was just in all my head to make me feel more confident. confused, andrew.
AnswerID: 2959

Reply By: John Sullivan - Friday, Apr 26, 2002 at 00:00

Friday, Apr 26, 2002 at 00:00
Andrew, I fitted an adjustable turbo boost controller to my 2.8 TD GQ, available at most auto stores for about $100.00, brings the boost in lower and allows for the boost to be set at the correct setting. Made a lot of difference to the way it drives. Hope this helps.
AnswerID: 3138

Follow Up By: Andrew - Friday, Apr 26, 2002 at 00:00

Friday, Apr 26, 2002 at 00:00
thanks john, what do you mean by correct setting, is that increasing the pressure, if so are you concerned about overheating your valves/head? what psi do you increase it to and what do they run at standard? can you change the boost while driving, eg, doing extended freeway trips would you reduce the boost to protect the turbo/valves? very interested to learn more. p.s. do you understand the hub lock, i was told it was a diff lock but am not so sure, the description i have is the front drive shaft is engagded to the front wheels at all times, that sounds locked to me? happy patroling, andrew
FollowupID: 1245

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