2jz build

[rob@vems.co.uk]

You *do* have a VEMS at home though...
I can lend you my test harness, its not seeing any action at the moment.

[jrussell]

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.

Which version are you using? I might suggest uninstalling VemsTune, deleting the install directory, then install the latest stable version (7-20-2011 as of today). I've had no problems at all using it in offline mode. Maybe something got messed up along the way? Deleting the install directory will make sure the settings (no gauges displayed) aren't retained from one release to another.

[irishtwincam]

Ive a laptop, no 12v source.

[rob@vems.co.uk]

Car battery... 12v PSU from Maplin...

[irishtwincam]

True dat

[DI-Racing]

yeah!!!

[irishtwincam]

Drove supra with live VE analyser on and autotune on.
Car now drive s abit smoother at low revs/part throttle.
Less prone to cutting out when slamming the throttle closed.




The f1 help suggests burning after changes are made, but this appears to only be possible if autotune is on.
Unless it means you must manually enter data then burn if autotune is off?

Left to right.
1 Before any changes
2 Autotune at idle while free revving slowly, stabbing throttle, slamming throttle closed to deal with cutout tendancy/
3 Autotune while driving up and down the road fairly sensibly.


I imported them in an odd order hence the diffeerences highlighte not being entirely correct.


Does any of this look ok?

[Jim_W]

Autotune seems to work very well when acceleration enrichment is already correct, but does not filter out events where acceleration enrichment is active, nor does it take into account the delay between the injection event and the exhaust gases passing the oxygen sensor.  These are built into the VE Tune by Statistics tool, but I have found that even when most of those events are filtered out it leaves a few bumps.  It would be nice if the filters and options for lambda delay were also built into the default autotune filter.  I guess the bottom line is be careful.

[irishtwincam]

Cheers for that.
I also figured outthe offline guage issue:
The guage icon at the top wasnt selected by default? The Shift+F1 job.
Hit that and all is well Doh.

Still cant turn EGT temp on?

[gunni]

Don´t use Live VE analyzer.

Rather drive and collect as large a log as you can and have the VE tune by statistics do the job.

Live VE doesn´t do the job unless you have configured it correctly. And you should already be proficient in tuning by yourself
before even contemplating using it. Thus you wouldn´t have problems with it not doing what you are wanting it to do.

There are areas and conditions when you do NOT trust a autotune / log review feature.

[irishtwincam]

Big up da ruffest gunark for sorting the tacho


Can anyone explain how to enable the EGT guage on the VemsTune display?
Car has an EGT fitted and wired, just doesnt seem to be any info on screen or in logs showing EGT?

[Jim_W]

Right click on the gauge where you want EGT to be displayed, hover over Change Gauge Data to..., Temperatures, then click on Exhaust 1.

[irishtwincam]

HKS 2202-RT085 intake/086 exhaust
272°      9.3mm      113°      2202-RT085    
272°      9.3mm      115°      2202-RT086
http://www.hkseurope.com/engine/apps/camshaft.htm


The actual cam timing is unknown.
Adjustable verniers are fitted but were left at 0 until the car was being mapped.
Assuming the verniers are the same timing as stock when unchanged

intake centreline 113.5 atdc
exhaust centreline 112.5 btdc

Based on
http://www.turbosupras.com/pages/pages/specifications/JZA80/jza80.htm

So ~113/113 centrelines.


More cam timing/dyno info for 2jzgtes
http://www.supraforums.com/forum/showthread.php?404377-Hks-264-264-272-264-And-272-272-Testing-by-SP-ENGINEERING!!!!

[irishtwincam]

gunni: cam timing above.
S7 config uploaded.
Also enabled the EGT guage on screen to compare against Defi unit.
Damo reckoned there was an issue with EGT but said you might know what was up.

[irishtwincam]

So, car got mapped up, EGTs were high all the time, boost didnt really kick in til 5k rpm and car wasnt as powerful as it should have been.
Suspected cam timing was out, exhaust probably too advanced.

HKS cams and HKS cam gears installed as per factory manual.
Only problem is HKS dont put the dowels in the cam relative to the lobes properly.

Exhaust cam was 36degrees out, intake was out about 5, with a total of something like 2 degrees overlap!


Cams degreed in, 113/115 centrelines as per hks spec sheet.
The car now has a lovely lopey idle, boosts to 1.5bar with boost coming in ~4k rpm, seems to want to rev past 8k rpm .

hopefully fuel and spark maps soon, along with dyno sheet....

Stay tuned.