Outer Limits 4x4 Board

Hey all, I'm looking to get a 4-5" lift on a 105 cruiser, and 315/75R16 tyres (35")

Im thinking it might be a good idea to get it engineered! So im just wondering if anyone can give me an idea on what is a reasonable cost.

I've had 2 other cars engineered in the past (engine conversion in a TA22, and a turbo on a Torana) both were around the $600 mark. Would i be right in assuming engineering costs have sky-rocketed now?

Also, how much difficulty would i have with the above modifications?

Thanks
Mike

No one? I thought this would be a pretty common thing?

when i got mine done the center of the headlight must not be higher than 1200mm from the ground. make sure everything looks good i dont know what regs there are on tyres.

Prices vary depending on which engineer and what exactly you need passed. Ask them.

I' ve recently paid $660 for a rebody on a patrol, 4 inch, 35's and turbo- pretty normal stuff.
Once it starts getting exotic the engineer has to a lot more work, and take more responsibility. Prices go up accordingly.
Some engineers have a schedule of charges- X amount for each area requiring certification. Then you know what your up for.
Most I've had to pay is $3600.

The guys I've used have always wanted to know what the plan was upfront, then not handed over any paperwork untill the car was totally finished and in a roadworthy state - mudflaps, accurate speedo, full exhaust etc.
They'll want to check heights etc, rim width, track, vin numbers, rego details, noise levels etc.

mike_nofx wrote:Hey all, I'm looking to get a 4-5" lift on a 105 cruiser, and 315/75R16 tyres (35")

PM Athol off here..

But Im not sure your gonna be happy with the answer for what you wanna engineer..

Athol doesnt certify 35"

udm wrote:Athol doesnt certify 35"

because they are illegal*

however 315/75-16 which is nominally 34 and a half inches, is legal.

other things to be aware of are that a MAXIMUM of 6" over factory listed max height is allowed - a 5" plus 315's will put you slightly over that. Your tare mass will also be affected, so your load capacity will come down.




* the maximum allowable rim width for 4WDs is 8". 35x12.5-15 tyres are all designed for a minimum rim width of 8.5" **. so whilst the tyre is legal on an 8.5 or 10" wide rim, the rim would be illegal on the 4WD.



** I have heard that some engineers have included in the certificate to derate the load capacity of the tyres to allow 35x12.5"-15's on 8" rims. try your luck. Athol is obviously not amongst them. It may just be a dirty rumour.

dumbdunce wrote:

udm wrote:Athol doesnt certify 35"

because they are illegal*

i wasnt complaining, i was just letting mike_nofx know that Athol is not an option if he intends to engineer 35"

udm wrote:

dumbdunce wrote:

udm wrote:Athol doesnt certify 35"

because they are illegal*

i wasnt complaining, i was just letting mike_nofx know that Athol is not an option if he intends to engineer 35"

didn't say you were complaining . I was just clarifying that there is a good reason why he won't pass them, and that in all likelihood it will be difficult to find an engineer who will, however mike stated he has 315's which do not have the technical legal unroadowrthiness of 35's - 315/75-16 on a 16x8 rim are legal.

I cant see a reason why an engineer would not pass 315/75's on 16x8" rims on the vehicle in question, unless it failed a brake test with such wheels - which a 105 would pass with flying colours unless the braking system had some serious deficiencies. I am not an engineer.

its all good... i just went by the 35" he stated, because i am useless with metric sizes.

dumbdunce wrote: I cant see a reason why an engineer would not pass 315/75's on 16x8" rims on the vehicle in question.

due to the recommended manufacturer min width for the tyres.

bogged wrote:

dumbdunce wrote: I cant see a reason why an engineer would not pass 315/75's on 16x8" rims on the vehicle in question.

due to the recommended manufacturer min width for the tyres.

most? all? manufacturer's minimum rim width for 315/75-16 is 8", for 35x12.5-15 is 8.5" - which is why I can't see a reason etc repeating myself

dumbdunce wrote:

bogged wrote:

dumbdunce wrote: I cant see a reason why an engineer would not pass 315/75's on 16x8" rims on the vehicle in question.

due to the recommended manufacturer min width for the tyres.

most? all? manufacturer's minimum rim width for 315/75-16 is 8", for 35x12.5-15 is 8.5" - which is why I can't see a reason etc repeating myself

most manufacturers say 8.5-10 for 315's - which is what I was told when I asked bout gettin my GU done with 315's. Most I've looked at anyway repeating myself.

bogged wrote:

dumbdunce wrote:

bogged wrote:

dumbdunce wrote: I cant see a reason why an engineer would not pass 315/75's on 16x8" rims on the vehicle in question.

due to the recommended manufacturer min width for the tyres.

most? all? manufacturer's minimum rim width for 315/75-16 is 8", for 35x12.5-15 is 8.5" - which is why I can't see a reason etc repeating myself

most manufacturers say 8.5-10 for 315's - which is what I was told when I asked bout gettin my GU done with 315's. Most I've looked at anyway repeating myself.

which manufacturers? just had a quick look, BFG and Cooper specify 8" for 315's. couldn't find data for Goodyear.

Give John Wilson a call. He's numers on the RTA site. Even though he's in Canberra, he travels around a fair bit.