Turbo Systems

Cheapest way to cool your engine bay is to place spacers under the hinges at the rear of the bonnet.
This way all the hot air will flow past and out.

The only draw back is it may be dangerous / illegal because if your radiator hose blows on the hyway the water may blow through and cover the windscreen thus loss of vision.
I did this to my Holden V6 Hilux and had no problems!

Kev.

I have a GQ diesel with aftermarket turbo, and I have also been chasing overheating for years, particularly when towing. I have put in a bigger radiator (the old one was due anyway), and went through two non-factory viscous clutches (trying to avoid Nissan's extraordinary prices). Eventually, after the second viscous couplings failed (ie was not locking up at all), I replaced it with the factory one, and voila, no more problems. Yes, it certainly runs hotter than a standard diesel, but this clutch really kicks in, and even in the high 30's temperatures we've had this summer it hasn't run too high, and that includes towing down and back up Brown Mountain. After years of sweating on the temp gauge, I am much happier!!

I have also often thought that releasing some of the heat from under the bonnet would be a good idea, but cost etc has prohibited that. The louvres that used to be on the bonnets of racing cars (I"m talking vintage) would be excellent. I will investigate the GU bonnet scoop, so thanks for that tip.

Young 1,
Is it worth getting your timing checked.

Can be a cause of excess heat if out of spec.

I was talking to a Diesel mechanic today and this subject came up. He had the same problem with a nissan. His father had an identical rig except it had a 3 inch exhaust. The father had no problems at all. towed caravans with no problems. May be worth a try the motor would be more efficent so maybe less heat. Stands to reason if you have an after market turbo improving the exaust and if possable the inlet will be a big benifit.

Thanks for the comments so far guys.
I am lifting the back of the bonnet today - hopefully the extra airflow will help.
I had larger exhaust system installed at time turbo system was installed.
When vehicle went back to the Safari certified installer they adjusted the fuel flow to reduce the exhaust temperature.
Since then has certainly been an improvement, but as I said before I may as well not have a turbo on it, because now it's got no better performance than non turbo.
Also had timing checked at last service.
Surprised that there are so many people with over heating problems on vehivles with turbos.
I was told that these problems only occur on vehicles in Far North Qld and that no where else do they have problems. It would be interesting to find out if these problems are generally with aftermarket systems - do factory systems have the same problem?

Thanks for the comments so far guys.
I am lifting the back of the bonnet today - hopefully the extra airflow will help.
I had larger exhaust system installed at time turbo system was installed.
When vehicle went back to the Safari certified installer they adjusted the fuel flow to reduce the exhaust temperature.
Since then has certainly been an improvement, but as I said before I may as well not have a turbo on it, because now it's got no better performance than non turbo.
Also had timing checked at last service.
Surprised that there are so many people with over heating problems on vehivles with turbos.
I was told that these problems only occur on vehicles in Far North Qld and that no where else do they have problems. It would be interesting to find out if these problems are generally with aftermarket systems - do factory systems have the same problem?

I've got the GU scoop going onto the troopy next week. We've (my mechanic and I ) have found that if we keep the boost (fuel) down below 10psi the tempurature is manageble. There is a huge difference in operating temp between even 8 and 10 psi.

If my truck starts to geta little warm i back off slightly (say down to 95kph (7psi) and the themp drops quickly. My bigger concern is the temps that the dual batteries are exposed too.

The bonnet scoop is more for battery life than to lower operating temp, but will be very happy to achieve both.

BTW when we were having troubles initially, my mech got onto the 4wd hire mobs in town to see what they do, all of them somehow 'lock' in the viscous fan. We've done this and i do believe that it has made a difference.