MS3x for Lexus 3uz

A general forum and a place for initial or prospective users. See MSExtra Documentation
Click here to enter
Contact a Forum Administrator
If unsure where to post, post in this sub-forum.

Moderators: jsmcortina, muythaibxr

MS3x for Lexus 3uz

Postby Hiluxfan » Mon Apr 23, 2012 12:51 am

Hello everyone.

I am new to the MegaSquirt family.

My plan is to fit a unit to the Lexus 3uz motor. I am thinking of the MS3X.

I have read all I can find so far and pretty confident. :RTFM:
My only concern is the VVTI. Can this be managed by MS3x and how?

Many thanks.
Last edited by Hiluxfan on Mon Apr 23, 2012 8:37 pm, edited 1 time in total.
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby jsmcortina » Mon Apr 23, 2012 3:49 am

VVT is supported on some engines. It depends on how the lexus 3uz handles it.

http://www.msextra.com/doc/ms3/vvt.html

James
I can supply, repair or upgrade Megasquirts in UK.

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
jsmcortina
Site Admin
 
Posts: 27923
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Mon Apr 23, 2012 4:59 am

Ok Ive done a bit more searching and came across this:

http://www.msextra.com/doc/ms3/vvt.html

It seems that you need the 1.1 alpha code. Only that code supports VVTI.

Does anyone have experiance with this?

I really dont want to buy and assemble everything without being sure if it can be done.

Many thanks
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Mon Apr 23, 2012 8:50 pm

Thanks James
I only now see that you have posted the same link. :oops:
I believe the 3uz would be similar to the 2jz VVTI but only X 2 cams.
See:
viewtopic.php?f=125&t=41606&hilit=vvti
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Sat Jul 21, 2012 4:42 am

Hi Guys
I am slowly but surely building my first MS3X. It has really been fun and I have learnt a lot.
I am now at the point where I have to do the configuration of the IAC valve. I’ve done a lot of searching but cannot find how to do this for the Toyota (Lexus) 3UZ.

The UZ family of engines uses a six wire stepper motor valve.
This is what I was able to find on it.
IAC Valve check and wiring.gif

Has anyone been able to addapt the MS3X to opperate with this?

Thanks in advance
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby SymTech Laboratories » Sat Jul 21, 2012 11:16 am

The stepper motor driver signals are brought out through the main connector, not the MS3X. The stepper motor driver is meant to drive bipolar stepper motors, but it sounds like your IAC uses a unipolar stepper motor. You can often use unipolar stepper motors as bipolar stepper motors, though. In this case you would probably leave B1 and B2 disconnected, then use the other four wires as if they were from a bipolar stepper motor.
SymTech Laboratories, LLC ----- MSQ File Repository: megasquirt.symtechlabs.com
Image
SymTech Laboratories
Super MS/Extra'er
 
Posts: 2188
Joined: Sun Aug 31, 2008 4:02 pm
Location: South Florida, USA

Re: MS3x for Lexus 3uz

Postby Matt Cramer » Mon Jul 23, 2012 5:04 am

SymTech Laboratories wrote:In this case you would probably leave B1 and B2 disconnected, then use the other four wires as if they were from a bipolar stepper motor.


You may not even need to disconnect B1 and B2. We actually managed to get the bipolar driver to work with a unipolar stepper with the power supply wire hooked up on a 5MGE motor. We just set it to "moving only" mode and got it dialed in.
Matt Cramer
Super MS/Extra'er
 
Posts: 8980
Joined: Thu Apr 16, 2009 8:08 pm

Re: MS3x for Lexus 3uz

Postby SymTech Laboratories » Mon Jul 23, 2012 8:44 am

Matt Cramer wrote:You may not even need to disconnect B1 and B2. We actually managed to get the bipolar driver to work with a unipolar stepper with the power supply wire hooked up on a 5MGE motor. We just set it to "moving only" mode and got it dialed in.

That might be best. The motor will be driven like a bipolar stepper motor (more, but unnecessary torque) if B1 and B2 are disconnected, but the driver functions more like a unipolar stepper motor driver with B1 and B2 connected.
SymTech Laboratories, LLC ----- MSQ File Repository: megasquirt.symtechlabs.com
Image
SymTech Laboratories
Super MS/Extra'er
 
Posts: 2188
Joined: Sun Aug 31, 2008 4:02 pm
Location: South Florida, USA

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Tue Jul 24, 2012 1:57 am

Thanks for the replies guys!
I am not that clever with all the electronic stuff (yet). :oops:
If I understand correctly I have to set up the MS3 main board for the 4 wire stepper motor

(from the manual)
"i)Stepper Idle Valve: If using a 4 wired idle valve (or using as two spare outputs) then solder wires from:
a) JS0 to IAC1A
b) JS1 to IAC1B
c) JS2 to IAC2A
d) JS3 to IAC2B"

And then also connect B1 and B2 to +12V.
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby SymTech Laboratories » Tue Jul 24, 2012 11:57 am

That's correct, but also be sure to connect JS9 to S12C.
SymTech Laboratories, LLC ----- MSQ File Repository: megasquirt.symtechlabs.com
Image
SymTech Laboratories
Super MS/Extra'er
 
Posts: 2188
Joined: Sun Aug 31, 2008 4:02 pm
Location: South Florida, USA

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Tue Nov 20, 2012 11:15 pm

Thanks for all the help guys!

I didnt get a chance to play with my MS for some time now.
The IAC is now working on the bench with the Stims.

My next question is related to the VVTI.
At the moment I am just trying to set it up for VVTI on/of.
So far I've managed to get VVTI1 working but no luck with the second one.
Ive tried different outputs such as VVT2, NOs1, NOs2 and boost.
Do I need a seperate input for VVTI2? Ive tried PT4 but I suppose it needs to be connected to somewhere on the Stim.

The manual does not give a lot of info and I cannot find too much here.

Please help!
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby jsmcortina » Wed Nov 21, 2012 5:03 am

Post your MSQ, it is difficult to answer your question without seeing your exact settings.

James
I can supply, repair or upgrade Megasquirts in UK.

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
jsmcortina
Site Admin
 
Posts: 27923
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Thu Nov 22, 2012 12:43 pm

Tanks James
Attached is my MSQ
This is still "a work in progress" and so far only used for bench testing.

2012-11-22_23.40.29.msq
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am

Re: MS3x for Lexus 3uz

Postby jsmcortina » Thu Nov 22, 2012 5:07 pm

I'm not actually sure if on/off is supported with more than one VVT valve, it doesn't really make a lot of sense - you need to use the closed loop true position system instead.

EDIT: I double checked and this is correct. On/off only works on a single output. I've updated the ini file for a future release so that the other cams will be greyed out in this case.

James
I can supply, repair or upgrade Megasquirts in UK.

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
jsmcortina
Site Admin
 
Posts: 27923
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK

Re: MS3x for Lexus 3uz

Postby Hiluxfan » Fri Nov 23, 2012 12:42 am

Thanks a lot James.
So, if I want to run on/off VVT on the engine I have to connect the one output to both solenoid valves.
I wanted to test closed loop next in any case.
Will give it a go!
Hiluxfan
MS/Extra Newbie
 
Posts: 26
Joined: Mon Apr 23, 2012 12:13 am


Return to General, New users, Purchasing

Who is online

Users browsing this forum: Bing [Bot], Yahoo [Bot] and 1 guest