Author Topic: 2jz build  (Read 30484 times)

Offline DI-Racing

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2jz build
« on: August 11, 2010, 04:53:35 pm »
















    thought i would share this build with you all,,,as it stands.....
   
 3ltr twin turbo 2jz gte,greddy tdo5s,jun manifold,standard inlet,denso 1000cc injectors,block decked and honed,crank polished and balanced,.acl main bearings,carrillo rods,wiscoe pistons,head pressure tested and faced,valves lapped and seals replaced.hks fuel rail.new oem water and oil pumps,head gasket and front pulley.billet tensioner and hks cambelt.arp fasteners throughout.twin warlbro fuel pumps and all the usual support mods with,of course,VEMS ecu....will keep ya posted,,,

Offline DI-Racing

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Re: 2jz build
« Reply #1 on: August 18, 2010, 05:04:24 pm »
 8)  ok, so we are still waiting for the clutch to arrive and also undecided on what front pulley to use and as such cant install crank,pistons ect,,(balancing),,,dammit!!!,oh well got other stuff to do like mount the vems and install fuel systems,,meanwhile ive just got a vems wide band kit for my 200sx,awesome quality and support,,as usual;-)

Offline DI-Racing

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Re: 2jz build
« Reply #2 on: September 16, 2010, 11:27:57 pm »
update,,,
   the clutch finaly arrived so the build can commence...at fucking last,,,keep ya posted,,should get interesting....;-)..

Offline irishtwincam

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Re: 2jz build
« Reply #3 on: July 16, 2011, 12:10:37 pm »
*cough* updates *cough*

Offline irishtwincam

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Re: 2jz build
« Reply #4 on: July 30, 2011, 11:23:02 pm »
It drove today, after the brakes got a good bleeding :D
Also flushed out the office computer as it was riddled with a virus.
Expect video and pictures posted tomorrow.

Can anyone recommend cam timing for a 2jz with 272/272 cam setup?

Offline gunni

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Re: 2jz build
« Reply #5 on: July 31, 2011, 09:22:53 am »
Best just to see how the current cam timing controls the VE curve and spool and go from there

Offline irishtwincam

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Re: 2jz build
« Reply #6 on: July 31, 2011, 05:31:30 pm »
First successful start
Some vac leaks etc holding the revs up, no wastegate on mani
Damo on the case checking that everything is ok :)
http://www.youtube.com/watch?v=y-TLoIzV4uM

Running vid
More exhaust bits put on to quiten things down :D
Ignore the bit wiht me mumbling about audio.
http://www.youtube.com/watch?v=79-bSPlxl0w

First drive
Hooray :D
http://www.youtube.com/watch?v=vkUPZft3O-Y

Offline irishtwincam

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! ! ! TPS PROBLEM ! ! !
« Reply #7 on: August 28, 2011, 07:22:20 pm »
Hi Chaps,

2jz with KU Engineering plenum & KU Engineering TB.
TB is fitted with Toyota TPS 89452-53010, wiring is as per image below.

Calibrating TPS results in low ADC value greater than high ADC?

With Low ADC 72 / high ADC 1: TPS reads 0-99.6%

The problem is that mechanically the throttle body is opened 50% of the way?

We unscrewed the securing screws on the TPS.
Adjusting one direction made it worse.
HADC approached 0 and we only had 30% of mechanical sweep being measured.

Adjusting the TPS completely in the other direction gave us 70% sweep which could be metered.
HADC 89 / low adc 1


Problems:
TPS reads high to low, not low to high.
The entire mechanical sweep of the throttle plate cannot be measured?

Possible causes:
Wiring is back to front somehow? TPS not wired properly?
VEMS needs to be told the sensor reads high to low, not low to high, or vice versa?

KU throttle body sweeps more than sensor is capable of???

Does anyone have direct experience doing TPS calibration with KU Engineering TB on VEMS?


Please help, we cannot datalog without resolving this and we certainly cant map the car.


TPS & wiring
http://s223.photobucket.com/albums/dd186/irishtwincam/280820113229.jpg

Engine TB and plenum pic
http://s223.photobucket.com/albums/dd186/irishtwincam/300720113186.jpg

Offline irishtwincam

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Re: 2jz build
« Reply #8 on: August 28, 2011, 07:53:59 pm »
We appear to be using all 4 wires on the loom, although the harness should only need 3 wires (5v, earth and signal)?

VTA is the true signal wire as it measure TPS from .5v to 4.5v
VTA2 is only for error correction on stock ecu.

http://www.turbosupras.com/pdfs/JZA80%20TSRM/DI.pdf
Page ref "DI-40"

Assuming we have 5v and Earth wired correctly TPS voltage should go .5v to 4.5v giving a low adc (tps 0%) less than high adc (tps100%).

If VTA2 is being used for a signal, it may only wor for a narrow sweep range, this may be the issue?
5v and earth back to front, also VTA2 used for signal instead of VTA.

Offline rob@vems.co.uk

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Re: 2jz build
« Reply #9 on: August 29, 2011, 11:57:55 am »
What I would do is speak to the person who installed the system, and who calibrated the TPS before starting the car the first time.

Offline irishtwincam

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Re: 2jz build
« Reply #10 on: August 29, 2011, 04:06:33 pm »
NA tps fitted, not the turbo one I posted voltage sweeps for.
Backprobed voltage to VEMS which showed it worked fine.
.5 to 4.5v sweep.

KU engineering tb is designed with throttle cable on oposite side to stock supra item.
Probably to clear the PAS pump fitting on which it would otherwise foul.
TPS needs to work back to front, hence high to low issue.
TPS needs to be "sprung" to keep TB swing arm in contact with it when reversed.
The TB wasnt adjusted to allow TPS to be in calibrated range.
IT was sweeping until there was no contact with the tps arms.
We undid the grub screw holding the tps contact arms against the TB shaft.
Rotated it 90 degrees or so until it kept in contact with tps throughout the full sweep.
So starts at 4.5v and as you increase throttle, voltage drops to .5.

It could be possible for someone to hit the throttle faster than the ts spring can keep up, but unlikely.
Its also possible that the spring will go weak from being kept bound tight sitting at idle.
But as it stands its fine.
0 throttle is ~230adc, 100% throttle is ~50adc.

Wiring was fine :D
I could reverse the 5v and earth wires to have it sweep low to high, but thats a non issue it seems.
The spring is more of a concern,, but not a great one, unless osomeone else says otherwise.

Going to have a go at datalogging it with current map.

Lesson I take for the future, check that tps outputs what you want before you start the car.
note: ive had a quick google and it seems the Q45 TB is preferred for the KU manifold as it has the TPS on correct side.

There you go :D

Offline rob@vems.co.uk

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Re: 2jz build
« Reply #11 on: August 29, 2011, 04:34:26 pm »
The voltage sweep is changed by swapping the +5v and gnd wires over - but there is no point because VEMS works perfectly in either direction.

Offline irishtwincam

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Re: 2jz build
« Reply #12 on: August 29, 2011, 06:32:28 pm »
Dunno if you can figure out from the images below but the turbo TPS swigs different from the non turbo tps.
Guess the KU engineering TB is designed to suit that tps.
Assume nothing in future :D

http://i223.photobucket.com/albums/dd186/irishtwincam/290820113230.jpg
http://i223.photobucket.com/albums/dd186/irishtwincam/290820113232.jpg

Car runs much better now, hits a brick wall if it tries to boost.
If we can get a turbo tps thats working Ill fit that so everything is correct.


How does one get EGT displayed on the screen and does a datalog automatically log everything even if its not on a guage on scren?


Offline irishtwincam

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Re: 2jz build
« Reply #14 on: September 05, 2011, 12:02:13 pm »
Cheers for the vids Gunni.

I am playing with Vemstune at home and everytime I start it there are no guages displayed, unlike when an ECU is connected.
There doesnt apear to be away to turn on / bring to front, the standard set of guages.

Also, trying to add EGT crashes Vemstune?
Most things crash Vemstune when there is no ECU connected.
Its making it difficult to learn.