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Old 08-15-2007, 12:51 PM   #1
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2007 27' Safari FB SE
London , ontario
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towing conundrum

Tow vehicle is a 1990 Toyota Landcruiser HDJ81 with 1hd-t turbo diesel, auto, trans cooler, trans temp gauge, stock water temp gauge on dash, boost gauge and pyro. 2.5" exhaust ported out the side with no bends or restrictions.

Trailer is a 28' Airstream FBSE GVWR 7600#

Normal driving at 100kph, boost 9-10, pyro 550-650, trans 160-180, water mid way up gauge.
Towing AS at 100kph, boost 11, pyro 800-900, trans 180-190, water mid way.

All the above in OD.

At 90-100kph with some hills (big hills) I pop out of OD, boost 11, pyro 1250 (I back off at this point), trans 190, water temp starts to climb to 3/4 level.

Water temp did climb more and faster but I removed my offroad lights which pretty well blocked the rad either side of tranny cooler.


So my point? Should I be concerned about these numbers? Biggest concern being water temp. The truck does OK, 168hp and 268 ftlbs but she's pulling maybe 90-95% capacity I feel. GVWR 7700#

Hensley Arrow hitch.

I'm worried that it may be too much and now I'm starting to think about a 3/4 diesel PU. It's just that this year we bought a new house and a new trailer, don't really want to buy anything else "big."

BTW, I tow in OD because I watch the gauges and the truck can handle it, plus it's the difference between 2200rpm and 3000rpm.

Also trans temp probe is in the pan, pyro pre turbo.
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Old 08-15-2007, 01:13 PM   #2
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Quote:
Originally Posted by gowyn
Should I be concerned about these numbers?
Yeah, there all in metric!

Seriously, the general rule of thumb here on the forums is keep the load under 75%-80% of the tow vehicle's rated capacity. Even a 27' Safari is entering the 3/4 ton territory in my humble opinion. I have a 30' Safari and I tow with a 3/4 ton diesel and am very satisfied. I really don't think I would be happy with a 1/2 ton pick-up or SUV for a primary tow vehicle.

My guess is that you have probably exceeded or nearly exceeded your tow vehicle's capacity when you add in the weight of the passengers and tow vehicle's cargo, fuel, etc. Don't forget the weight of the LP and any fluids and gear in the Airstream. They are part of the calculation when you figure where you are on the % of capacity along with everything in the tow vehicle including fuel, clothing, food and don't forget the family pet! (no matter where the pet rides)
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Old 08-15-2007, 01:32 PM   #3
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I don't like to see pyro readings above 1,250 (We are talking Fahrenheit here, right?). When we turned up the pumps on diesel irrigation motors or tractors we would put a full load on them using a dyno. Our instructions was to turn up the pump till it the temp was no higher than 1,300. I always stopped at 1,250 for a little extra insurance.

Vaughan
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Old 08-15-2007, 02:07 PM   #4
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Sounds like you may need to take it to the scales to see where you are on the actual weights.
I would be concerned about the transmission temperature - heat kills transmissions.
What transmission temps do you run with the OD off?
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Old 08-15-2007, 04:05 PM   #5
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we're heading out again this weekend, more big hills so I'll get a better feel re: temps.
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Old 08-15-2007, 06:22 PM   #6
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Seems to me that when I tow in overdrive the lockout disengages frequently and then you get a lot of slippage in the torque converter. This causes the tranny to work a lot harder.
Towing at a higher rpm will mean less strain on the engine. If your fuel consumption doesn't suffer I would tow in drive, not overdrive.
My own setup is a E 150 club wagon with 5.4 litre gas engine and 3.55 gears. Trailer is a 94 31 foot excella.
Manual says gross combined weight of 12000 lbs.
My rig weighs around 13500lbs.
In drive everything works great. No braking issues. No overheating issues.
Only thing is it slows down on really big hills.
So what; I'm on holiday mode when towing so speed on hills isn't an issue.
Next truck will be the same but probably a 3.78 rear end.
I've been using this truck for three seasons of towing, and it now has 245,000 km on it.
Al
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Old 08-27-2007, 07:55 AM   #7
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well an update, found an '04 GMC 2500HD crew cab D/A.
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Old 08-27-2007, 08:44 AM   #8
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well an update, found an '04 GMC 2500HD crew cab D/A.
That will pull anything AS makes , with style
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Old 08-27-2007, 08:11 PM   #9
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yep she is a nice rig. Went out to look at a nice cheap Dodge Cummins 6sp, took some pix of this and made the mistake of telling the wife it had heated leather seats...and here I am in a Dmax with all the bells and whistles....

Have to admit, it's worth the little extra dough.
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