Lexus V8 conversion

[Sweetlips]

Hi there guys

I need some advice on a Patrol I'm looking at. It used to be a 3.0D but the engine was ditched for a 4.0L Lexus V8 which is married to the standard gearbox. Should I be concerned in anyway. Will any ratios be negatively affected by this conversion?

[Stefan]

Who did the conversion?

[ricster]

Whooooo hooooo Laurence you beauty !!!....

PM Alex
http://www.patrol4x4.co.za/memberlist.p ... file&u=837

His 3.0 blew up and he changed to a Lexus motor. He will give you any info you need!! Tell him Cedric referred you.

I think that will be awesome in the dunes at Atlantis !!!

[Alex Roux]

Hi Lawrence

Main items to check:
1) How many kms since conversion and what kind of milaege
2) Original gearbox or Lexus box?
3) If Lexus box, people have had issues with the temperature of the gear box oil. The Lexus box is not made for 4x4ing.
4) Gear ratios: You should test drive it and decide for yourself. You can of course change the settings on a dyno if you need more or less torque at different rev ranges.
5) Is the vehicle lifted? Check the space between the front diff and the sump. While 4x4ing the two may hit if not done properly. Ideally you should use a Lexus SUV sump (rather than the LS400 sedan's sump) which is shaped such that it is well clear of the diff.
6) Check the exhaust pipe routes. Custom exhausts for a V8 is a specialist job and the bottom of a Y60/Y61 patrol was not made for a V8 exhaust layout. So it depends on who did this job, wether it was done right or not. Also these pipes may be close to other areas underneath that you are not comofrtable with.

[ricster]

Told you Alex is the GURU on the Lexus !!!..... ha ha

[Sweetlips]

Gees you can say that again

[Herrie]

Two Patrols with the Lexus V8's have burned out already!

[Kagiso II]

Two Patrols with the Lexus V8's have burned out already!

Oepsssss -- watter 2 was diet Kobus? Ken ons hulle ?

[ricster]

yip that's true. Although I think Wimpies burnout was due to something inside the cab that went wrong, but could also have been due to a wire in the engine bay getting caught somewhere or too close to the exhaust and melting....

[Alex Roux]

Burnouts do happen. Most common causes:
- Dry drass on you exhuast (more likely Catalysts converters, but free-flow is not impossible)
- Electrical short that is not fused
- Fuel spitting carburators (the old Lamborghini Miuria was a common burnout due to this)
- Turbocharger failure resulting in an engine fire
- Fuel leaking onto the exhaust or the manifold

With regard to wiring on engine conversions. This is actually quite limited:
The only new connections that need to be made on an engine conversion are as follows:
- Temp gauge
- Rev counter and
- ECU
But you can equally easily botch the wiring when installing the auxillary battery.

Fuel leakages:
This can happen if plumbing was bad. Also happens on older cars and bad maintenance.

In Wimpie's case there was a short in his wiring harness that did not kick off the fuse.
He was clear to me it had nothing to do with his conversion.

The second burnout was JG Shields:
His was not a Lexus conversion but a TB48 transplant (although he was waiting for a Lexus, a 4.8 became available after a rear-end accident - engine was unscathed)
In his case he got himself a suspenion lift after the conversion. Then, the break pipe was too stretched and started leaking onto his exhaust (one really needs to check these things after a suspension lift). Hot break fluid was flammable. Not good.

Moral of the story;
What ever mods you do to your car, make sure it is done right the first time.
Be that suspension lift, second battery, engine replacement, conversion, whatever.

The burnout on this thread was a perfectly good Disco (3 or 4) - (if there is such a thing).
http://www.4x4community.co.za/forum/sho ... light=Burn
My guess on the cause is, grass on the cat converter, since wiring and pipes should still have been good as new.