2JZGTE Pinging

[Phoenix01]

The piggyback isn't somehow interfering with toyota's crazy actuator pulsing on the 2nd turbo?

Could try temporarily locking the actuator open (TTC mod - temporary/test version) to see if that fixes the problem.

[teamdrinkalot]

No, the piggyback only effects the fuel and timing. I would be scared to lock the actuator open, the last time I stuffed around, I overboosted and destroyed the rear turbo. That took me 3 days to change.

[wilbo666]

No, the piggyback only effects the fuel and timing. I would be scared to lock the actuator open, the last time I stuffed around, I overboosted and destroyed the rear turbo. That took me 3 days to change.

Hey mate,

Seen this thread?

http://www.toymods.org.au/forums/showthread.php?t=47226




Cheers
Wilbo

[Phoenix01]

No, the piggyback only effects the fuel and timing.

Yeah I know that's what its supposed to do. But it's only natural to question what was changed prior to the problem appearing.

That and I know the actuator pulsing is controlled by the factory ECU. So if you were to take "control" away from the ECU and force it to run both turbo's full-time then you could atleast see if the problem still exists.

Sorry to hear about the overboost misshap. I had to do the TTC mod after replacing my factory ECU a few years back. Boost was limited by a restrictor in the exhaust after the dump pipe. But then with the factory setup, that was a common way to limit the boost if you put a larger exhaust system on.

[teamdrinkalot]

Hey mate,

Seen this thread?

http://www.toymods.org.au/forums/showthread.php?t=47226




Cheers
Wilbo

Yes I've looked at this thread before, but not that stuff from the British site - those colourful drawings were great.
I set up a video camera under the bonnet and aimed it at the exhaust valve actuator, as it seemed to be the one most likely causing the lack of 2nd turbo, took the van for a spin and sure enough the video showed no operation.
Then the hunt began - blew air into the actuator, which was fine. Then blew air into the pressure tank and could hear the air escaping somewhere.
Found 2 hoses not connected, both at the back on and near the exhaust valve bypass actuator (took 2hrs to get them back on). I must have missed putting these back on when I changed the rear turbo (that took me 3 days).
Getting 8-9lb at high revs, so it's back to the dyno on friday.

So thanks again Wilbo and how is the VVTI going?

[2JZR31]

I never found troubleshooting of the stock turbos too hard. First thing to do is apply some compressed air (not too much!!) into the pressure feed for the pneumatic actuation system with the car not running. The hose for that joins into the middle of the cast intake pipe where the boosted air from 2 turbos joins into one.

Now that you have filled the pressure tank with air, listen for leaks. Pressure should remain in the system and compressed air should be available the feed port of each VSV responsible for opening the intake air control valve and large exhaust valve. To test this pull the hose off and you will hear pressure escape. If there is no pressure, you have a leak.

Now if you do have pressure, false feed the VSVs with 12V and watch the intake and exhaust valves operate. If they don't operate, check the VSVs actuators etc.

The pre spooler can just be tested by blasting some compressed air into the hose for it SLOWLY to see if it opens. Also, test each VSV by feeding 12V to them to see if they operate. Also there should be 12V waiting at each VSV with ign on, the ECU grounds the other wire to operate them. Test for this.

Your prob will most likely have appeared on the very first pressure test as rooted hoses will be the prob 90% of the time,so in reality 90% of "impossible to find" probs can be found in 30 seconds by listening for the leak, but if you have done all this and it still doesn't work, hook a test light up to the VSVs and see if they are being fired by the ECU at the right times.

I'm no mechanic and don't know much, but its not that hard.

[wilbo666]

So thanks again Wilbo and how is the VVTI going?

Glad to see you have it sorrted!

The VVTi is slowly getting there, just in the final movements of getting it to run on the Adaptronic! (Trying to crank it as we speak, this is being typed from the EEE PC in the dash of my Supra!)



Cheers
Wilbo

[teamdrinkalot]

Glad to see you have it sorrted!

The VVTi is slowly getting there, just in the final movements of getting it to run on the Adaptronic! (Trying to crank it as we speak, this is being typed from the EEE PC in the dash of my Supra!)



Cheers
Wilbo

Are you still at Mt Isa?

[wilbo666]

Are you still at Mt Isa?

Yeah, sure am...

By the way, awesome avatar pic! Looks great.

Cheers
Wilbo

[teamdrinkalot]

Been on the dyno today and it is much easier to watch the actuator's while the van is stationery reving it's tit's off.
Found that the air intake valve and the exhaust bypass was not working. Fixed the air intake but no luck with the exhaust bypass.
It is amazing when you get things working - started on the dyno with a max of 144hp at the wheels, finished with 220hp. Even picked up 11hp in the 1st turbo range.

Simon O'dell Fontana that operates McGregor Mechanical in Brisbane is a genius on the dyno. Leaves no stone unturned to get a result.

[Shifty]

edit, just noticed this is an old thread, i was answering the original question lol