High tensile chassis

tomsoffroad · Post by **tomsoffroad** » Fri Dec 23, 2011 7:06 pm

Just doing some research for a really cool job coming up in the new year and was talking to the certifier about it.
It a 02 4wd d/cab lux. He mentioned that it might have a high tensile chassis.

Can anyone confirm this?

Cheers Tom

Smurf · Post by **Smurf** » Fri Dec 23, 2011 7:19 pm

Apparently yes..

Fundamental to the IMV design is a rugged new chassis that shares the same ladder type design as its predecessor but is bigger in overall dimensions and in the dimensions of its side members. The double box side rails go up from 60mm in width to 90mm while the height goes up from 120mm to 160mm. An additional cross member is added to the chassis to reduce torsional twist and improve the handling characteristics. High strength steel is used for the chassis which, together with the larger section size and additional cross member, improves the overall rigidity and strength of the chassis. The number of welds has been reduced to improve both quality and durability.
Copied from
http://www.4x424.co.za/?func=mod&pid=ne ... ils&id=100

The strength of the Hilux lies in the vast volume of data Toyota has amassed in years of building reliable and rugged pickups. All models feature a laser-welded high-tensile steel body and chassis that has been subjected to exhaustive CAE simulation resulting in light weight with excellent torsional rigidity for precise handling. Hilux range is available in 2WD/4WD single and double cabins and gasoline and diesel engines.
copied from
http://www.kojomotors.com/index.php?opt ... Itemid=216

IcedJohnno · Post by **IcedJohnno** » Fri Dec 23, 2011 7:22 pm

Lots of chassis's are made of High Tensile steel.
One of the first was the Model T Ford, about 1909.
The Austin 7 was as well, 1922.
The usual way to find out practically , is whether you can easily drill a hole in it. Is it like drilling MS plate or harder?

Being HT does not make the chassis any more rigid. I wondered this when re-creating a GP race car chassis from 1912. When I looked further, I saw that the Modulus of Elasticity, known as E is very similar for all steels.

So for more rigidity, the usual way of more triangulation still applies. Easier on a 4 by than with a delicate geriatric chassis design.

Rural53 · Post by **Rural53** » Fri Dec 23, 2011 7:27 pm

Recently I heard third hand, so I can't swear it as fact, of a Hilux high tensile chassis that was drilled for air bags, to help the leaf springs, by a suspension shop. When it went for it's next WOF the WOF guy refused to put a WOF on it. The owner appealled to NZTA and they agreed with the WOF guy and ordered the Hilux off the road. The suspension shop's insurers ended up buying the guy a new Hilux.

As I said, this is third hand info but might be worth talking to your certifier about.

tomsoffroad · Post by **tomsoffroad** » Fri Dec 23, 2011 9:08 pm

Just been googling. :mrgreen:

The difference between the old and new chassis is easy as to spot. Old ones which are easy to weld are square section and high tensile chassis are not

Couldn't actually find a pix of a 02 hilux chassis so dont know which they are :oops:

The welding procedure for high tensile ones would make it not worth doing. pre heat, post heat, blah, blah. The chassis would have to be stripped bare :shock:

Need to do more googling

IcedJohnno · Post by **IcedJohnno** » Fri Dec 23, 2011 10:22 pm

Tom, do you think the factory robotic welding system does the pre & post heats? I doubt it, cos it would not be cost effective.
I would imagine that they use the correct grade wire and a relatively cold weld.
Why can you not do the same?

juz · Post by **juz** » Sat Dec 24, 2011 7:09 am

Panel shops weld Hs and UHSS all the time, Ive seen a couple of beam axled 05+ Hiluxs kicking around lately, surely they had some welding done? Just ask the cert man if its legit before you start the job. If hes not keen, ask the next cert man.

sakoman · Post by **sakoman** » Sat Dec 24, 2011 7:31 am

HI I do a lot of truck chassis lenghtening etc i would be pretty sure that you could just weld up your hilux chassis without any pre heat or post heat, i wouldnt think the steel toyoda use would be over 600 mpa other wise it would just create to many issues in production and also would be that hard it woul fall to bits.

tomsoffroad · Post by **tomsoffroad** » Sat Dec 24, 2011 9:01 am

IcedJohnno
Post subject: Re: High tensile chassis

Tom, do you think the factory robotic welding system does the pre & post heats? I doubt it, cos it would not be cost effective.
I would imagine that they use the correct grade wire and a relatively cold weld.
Why can you not do the same?

No reason at all. Wayne also wants all welding documented if high tensile.
I need to do some more homework

Shit of a time of year for that :lol:

niblik · Post by **niblik** » Sat Dec 24, 2011 10:44 am

all i'm pickin up is

"blah blah, its not gettin built, blah blah, not out pedallin yet, blah, rocks be callin, rah rah rah, missin trips, etc etc etc...."

Fakey · Post by **Fakey** » Sat Dec 24, 2011 10:56 am

Search bubs username on outer limits forum he's done two sas post 05 hiluxs an both are engineered in Queensland, ( one actually lives in emerald where I work, it's pretty cool)
Can't imagine you'd run into too much trouble welding the chassis on them

KIWI_TERRANO · Post by **KIWI_TERRANO** » Sun Dec 25, 2011 8:32 am

I have a 02 hilux you can measure up on way past to check tom but theres plenty of this model beam axled out there, buds customs in oz is sas sheep shager hiluxs so there mustnt b to much of a issue