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Streetracing.co.za • View topic - 1UZ VVTi conversion questions
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 Post subject: 1UZ VVTi conversion questions
PostPosted: Fri Jun 17, 2016 4:00 pm 
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rookie

Joined: Sun Oct 20, 2013 5:07 pm
Posts: 94
Location: Western Cape
Hi folks

So I want to do a Lexus 1UZ VVTi conversion on a 4x2 2800D Colt bakkie, myself. The Colt is an everyday driver, and shop truck. I need it to be reliable and I don’t have an open chequebook for the build. First off, I would need to make some choices, and here I need your much appreciated input. Most choices would probably come down, to which is the most cost-effective solution.

I want to purchase a pre-wired engine and need to decide between the OEM ECU setup with the Bussmann fuse system, or the Spitronics ECU system. I feel each system have their merits, my only concern is that I probably need to change the diff ratio when using the OEM ECU and auto box, which will add to the cost, while the Spitronics might be fettled to work, but that then points to some time on the dyno, comments will be appreciated.

Furthermore I need to decide whether to use the standard 5-spd automatic which comes with the 1UZ VVTi, or change to a manual gearbox. I would be OK with either setup.
If I go the manual route, I would need to source a suitable manual gearbox, bellhousing, flywheel, clutch pack, and perhaps an adaptor plate. The standard gearbox can’t be used for the conversion, it would not handle the power.
If I use the 5-spd automatic, I think I would need more electronic controllers. I would need to source an automatic shifter, and since the 5-spd autobox makes use of a digital pulse for speed sensing, how does one get the cable operated speedometer working?

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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Sat Jun 18, 2016 8:27 am 
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2 Bar BOOST!
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Joined: Sun Jan 10, 2010 11:03 pm
Posts: 2488
Location: The Flats
OEM ecu with autobox will be the best cost wise, install and start.. Bellhousing+flywheel is R5500.
Luk clutch kit is R3200. Fatboy is R7000. Doubt u can beat OEM for fuel economy plus you still have
use of diagnostics and full function of vvti. If you want to go manual you can still go oem ecu, read
somewhere you hot wire it in the Neutral or park position and can use dicky or spitz gbox controller
and you will have tiptronic function which the the vvti auto boxes can do, then mount up/down
buttons on the steering and auto mode/reverse and park button somewhere else.

AND...you still have all the safety features of OEM ecu .ie knock and lambda control

My 5c

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'81 RWD Corolla 3sgte III
'83 Conquest 4AGC III + Dellies - X
Mk1 Escort 1.6 Banglvan + Cam + Dellies - X
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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Sun Jun 19, 2016 8:09 pm 
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2 Bar BOOST!
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Joined: Wed May 21, 2008 3:10 pm
Posts: 15112
Location: Goorrood
Agreed, use OEM with auto, they work together and you will have much less work to do to complete the setup.

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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 11:07 am 
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rookie

Joined: Sun Oct 20, 2013 5:07 pm
Posts: 94
Location: Western Cape
Not worried about a tiptronic function. And on the manual route, does it have to be a fatboy? Isn’t the W58 sufficient?

Some have suggested I get a half cut/front cut through Engines & More, but not sure it’s worth the cost over loose components. And although I will learn, my knowledge of engine electronics are limited, which is why I feel more comfortable with the pre-wired engine options.


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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 11:58 am 
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2 Bar BOOST!
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Joined: Sun Jan 10, 2010 11:03 pm
Posts: 2488
Location: The Flats
W58 is the fatboy. W55 is the normal "21R" R2000+ not ideal for a heavy bakkie. d4d is 10K.
Half cut is a good idea if the price is good. Wish i could have bought a half cut myself.

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'81 RWD Corolla 3sgte III
'83 Conquest 4AGC III + Dellies - X
Mk1 Escort 1.6 Banglvan + Cam + Dellies - X
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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 1:09 pm 
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rookie

Joined: Sun Oct 20, 2013 5:07 pm
Posts: 94
Location: Western Cape


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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 1:21 pm 
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2 Bar BOOST!
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Joined: Sun Jan 10, 2010 11:03 pm
Posts: 2488
Location: The Flats
:thumb:

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'81 RWD Corolla 3sgte III
'83 Conquest 4AGC III + Dellies - X
Mk1 Escort 1.6 Banglvan + Cam + Dellies - X
--------------------------------------------


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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 2:01 pm 
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2 Bar BOOST!
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Joined: Wed May 21, 2008 3:10 pm
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Location: Goorrood
W58 is more than strong enough, but I would still rather go with the automatic box you get with the engine. Remember you'll have to engineer a flywheel for it, then the bellhousing, and, and, and...

Save yourself a shit ton of work and money and use the auto box.

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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 2:26 pm 
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2 Bar BOOST!
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Joined: Sun Jan 10, 2010 11:03 pm
Posts: 2488
Location: The Flats
Mikes sells the bellhousing and flywheel for R5500 which can be spent better on something else.
With clutch kit thats R8700 + gearbox = R15700 ontop of wired engine. Only thing extra you will
need for the autobox is a oilcooler.

_________________
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'81 RWD Corolla 3sgte III
'83 Conquest 4AGC III + Dellies - X
Mk1 Escort 1.6 Banglvan + Cam + Dellies - X
--------------------------------------------


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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Mon Jun 20, 2016 8:45 pm 
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2 Bar BOOST!
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Joined: Wed May 21, 2008 3:10 pm
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Location: Goorrood
And if you fit a BMW 5 series radiator, it has an oil cooler built in.

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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Tue Jun 21, 2016 11:58 am 
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0.5 bar boost
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Joined: Sun Mar 25, 2012 8:42 pm
Posts: 820
Location: Kimberley
Radius engineering sells their Bellhousing R2200 and flywheel R2200. The clutch you buy at the spares shop.


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 Post subject: Re: 1UZ VVTi conversion questions
PostPosted: Sun Jul 03, 2016 10:44 am 
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Just arrived..

Joined: Fri Aug 14, 2015 1:41 pm
Posts: 22
Location: Pretoria
I thought I just share on how to fix the heating problems (from a friend I know who does this for a living) that a lot of guys are experiencing with the 1UZ swops.

Use the Nissan VG30 thermostat, its 76 degrees and the spring is a lot softer than the Toyota one. Just trim the odd 2mm off the base until it fits.
Behind the thermostat is a hole that needs to get a wells plug. That will prevent hot water from getting forced back into the head. If you use the heater lines at the back then you drill a 6mm hole through the plug.
Problem solved!


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