Turbo Systems

Submitted: Monday, Feb 10, 2003 at 13:56
ThreadID: 3307 Views:3344 Replies:7 FollowUps:7
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I am having overheating problems with my aftermarket Safari turbo system on my 3l diesel Hilux. Safari are no help at all.
I have carried out everything I can think of to stop the overheating but it is still a problem.
Apparently these problems are common where I live in Cairns - which makes you wonder why Safari don't warn you of this.
I have had the fuel flow screwed right back to reduce the exhaust temp (trouble is it has no more power than a non turbo 3l). The radiator system has been cleaned out, the viscous fan has had new silicone, even removed the driving lights to get more airflow.
Does this problem occur down south or is only in FNQ.
Would appreciate hearing from anyone who has had this problem and solved it.
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Reply By: Kev. - Monday, Feb 10, 2003 at 14:52

Monday, Feb 10, 2003 at 14:52
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.
AnswerID: 12802

Follow Up By: Truckster - Monday, Feb 10, 2003 at 15:04

Monday, Feb 10, 2003 at 15:04
I asked an engineer in Vic about this spacers under hinges, he says 1cm shouldnt be a problem legally wise.....

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FollowupID: 7465

Follow Up By: Kev. - Monday, Feb 10, 2003 at 17:20

Monday, Feb 10, 2003 at 17:20
Thats good to know but i think i went at least 20mm ,near enough i suppose.
Then again there was a few other things i was more worried about being legal , wheels , side pipes ect
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FollowupID: 7474

Reply By: Hendo - Tuesday, Feb 11, 2003 at 06:32

Tuesday, Feb 11, 2003 at 06:32
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.
AnswerID: 12860

Follow Up By: David - Tuesday, Feb 11, 2003 at 11:17

Tuesday, Feb 11, 2003 at 11:17
I'm thinking of a turbo on my GQ too...
What brand did you fit and aside from the heat what's your overall opinion.
Surely they have to give you some guarantee re performance and suitability, ie: if it overheats all the time perhaps you should talk to consumer affairs..
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FollowupID: 7503

Follow Up By: Hendo - Wednesday, Feb 12, 2003 at 00:21

Wednesday, Feb 12, 2003 at 00:21
The turbo was fitted when I bought the vehicle - it is a Luxons (made by Peter Luxon, now called Safari) so it has been there for the life of the vehicle. It goes great - not as quick as a good petrol or the newer turbo diesels, but when I first got it, it felt much stronger than my Maverick on LPG (the previous vehicle). And I get 15 - 16 litres/100km towing a heavy camper trailer, with a roofrack - kills a petrol in that department.

Also, I had the Berrima treatment on my previous viscous coupling, which improved it, but as soon as Reinhold saw it wasn't a factory coupling, he gave me the lecture about non-standard!! And, he was right. The list price for the Nissan part was $470 (ouch) but it has solved my problems. It cost me more than that over the years to buy non-standard units that didn't last or do the job.

In this instance, stay factory.
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FollowupID: 7570

Follow Up By: Nugget - Saturday, Feb 15, 2003 at 22:16

Saturday, Feb 15, 2003 at 22:16
I also have a GQ 4.2 diesel with 310000km just fitted a second hand safari / intercooler system I found for $1500. Done 5000km and have noticed an increase in temps but never above half way, even on the open road the other day in 41 degrees C at 115 - 120 kph. Haven't thrashed around in the sand dunes yet but am interested to see if that makes a difference. My viscous fan seems to be working fine because I can certainly hear it when it put the welly in. I also wonder if the intercooler makes a difference aswell.
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FollowupID: 7737

Reply By: Peter L - Tuesday, Feb 11, 2003 at 22:28

Tuesday, Feb 11, 2003 at 22:28
Young 1,
Is it worth getting your timing checked.

Can be a cause of excess heat if out of spec.
AnswerID: 12929

Reply By: Nordave - Tuesday, Feb 11, 2003 at 23:11

Tuesday, Feb 11, 2003 at 23:11
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.
AnswerID: 12936

Follow Up By: Truckster - Tuesday, Feb 11, 2003 at 23:28

Tuesday, Feb 11, 2003 at 23:28
May be worth a try, but a 3in mandral bent exhaust is around $800.... expensive thing to try and have it not work!
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FollowupID: 7564

Follow Up By: Suzuki Viagra - Wednesday, Feb 12, 2003 at 12:34

Wednesday, Feb 12, 2003 at 12:34
Dont pay the extra for mandrel beds - it's just not worth paying the price they ask. The usual difference in mandrel bends to ordinary is usually 5-10% extra flow for the whole exhaust but look at the price differential - what 200% - 300%????

If you're really concerned about flow it'd be cheaper and flow heaps more to use a 4" truck exhuast without the mandrel bends.

Besides even a non mandrel bent 3" will flow heaps better than a factory system....

Mandrel bends are only really of much benefit if bends get beyond about 60
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FollowupID: 7591

Reply By: Young - Wednesday, Feb 12, 2003 at 10:15

Wednesday, Feb 12, 2003 at 10:15
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?
AnswerID: 12952

Reply By: Young - Wednesday, Feb 12, 2003 at 10:15

Wednesday, Feb 12, 2003 at 10:15
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?
AnswerID: 12953

Reply By: chopper - Wednesday, Feb 12, 2003 at 19:48

Wednesday, Feb 12, 2003 at 19:48
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.
AnswerID: 12985

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