piehole1983

iTrader: (7)

Hi folks! I've recently installed ESL in my 97 T2000. On doing so I removed the Blitz boost controller that was already there and reconnected the Subaru BCS as I now have full control over boost through the ECU.

This, however, seems to have caused boost oscillation at WOT. I increased the target pressure slightly to no avail and then reduced the solenoid duty cycles again not making any noticeable difference.

Boost was better on the Blitz controller but still oscillated slightly. All vacuum hoses are new silicone hoses and any tee's etc are new also. The restrictor pill is still fitted and in the correct place too.

Any suggestions on what could be causing this? Could my actuator be the culprit?

The fact that the boost target is being exceeded constantly means the boost is being cut loads and I can't make any progress with mapping

Andy Stevens

Is it oscillating on the standard map?

piehole1983

iTrader: (7)

Yes Andy, it is indeed. I noticed it got worse once I recommissioned the stock BCS instead of the Blitz controller.

I had the gain adjusted pretty well on the blitz controller to keep it steady.

I don't think its a software thing, it seems to be actuator but I haven't adjusted it yet. Damn work is crazy this weekend!

Andy Stevens

Is mani pressure etc logging correctly?

piehole1983

iTrader: (7)

The ZT-2 is logging the oscillation along with it being visible on the boost gauge. It's also visible on the ESL log tables.

Andy Stevens

Doe the manifold pressure in the ESL log match what is showing on the reference gauge? (Or just open up a quick watch window and check from there). Is it a stock MAP sensor?

piehole1983

iTrader: (7)

I'll just double check before I say yes, but I'm sure it does. I've referenced them against each-other before just out of curiosity. Yes, still on the stock MAP sensor. You think it might be causing some issues?

Like I said before, it occurred on the Blitz controller but to a lesser extent.

Andy Stevens

Just checking the calibration is ok. You can map it out but might be better to get it working as Subaru intended with the stock map before continuing with the map. If you log mani press and wastegate duty and see if the duty is moving in time to the boost IYSWIM.

piehole1983

iTrader: (7)

Yeah, I understand. I'll hopefully get a go at it later on. That's my thoughts too, I want everything to be working before I start mapping. I just adjusted the duty cycles to see if it would help. I'll put them back to normal and check calibration

This might also be the surging I can feel at 2-3000rpm at cruising speeds. I mentioned it to you before thinking it was knock being detected and the timing being retarded by the ECU.

Thanks mate!

piehole1983

iTrader: (7)

Andy, took the car out for a while there and compared pressure readings from ESL, ZT-2, Blitz controller and Apexi boost gauge. All the same!

I've logged info from ESL and ZT-2 to compare as well. I had them both running at the same time.

Andy Stevens

If the calibration is ok then would check the boost circuit over carefully to make sure it is all stock. Does is oscillate on a steady throttle or full throttle or both?

piehole1983

iTrader: (7)

Just been having a look at the graphs from the ZT-2 and matched them up to the csv file from ESL. They show exactly the same events at the same time, so that's a good thing.

I did a run in 4th gear on a clear road. Rolling start at 2000rpm then floored it. The boost climbs in an almost perfect straight line to 1.22bar then starts to oscillate. Peak boost reached at roughly 2900rpm (great spool!).

Everything is stock, apart from the hoses themselves which were replaced as the stock ones were cracked.

piehole1983

iTrader: (7)

http://s12.postimg.org/f9wzclyzh/Log_screenshot.png

piehole1983

iTrader: (7)

piehole1983

iTrader: (7)

Only noticed on full throttle to be honest, I'll look back through the logs now.........

piehole1983

iTrader: (7)

Had a look through mate, the manifold pressure graph follows the TPS graph perfectly at partial openings. They are nearly identical. No oscillation or creep happening that I can see. Only at full throttle do I see the excess pressure and oscillation.

piehole1983

iTrader: (7)

Andy Stevens

Can you show me a plot of mani press and wastegate duty from the ESL logger on a full throttle pull using a CSV viewer like DeltaDash Demo? It's shwoing alot of overboost for a standard map (0.87bar target).

piehole1983

iTrader: (7)

No problem, I'll download that now and see what I can do. I noticed tonight's ESL log has logged wastegate duty in what seems to be raw data?

piehole1983

iTrader: (7)

I forgot to mention the boost target is currently 0.98 bar and wastegate duty is reduced slightly still. I forgot to revert to standard settings lol. Nonetheless it still does the same thing at standard settings.

piehole1983

iTrader: (7)

Here ya go mate:



Wastegate duty is looking like its having fun!

piehole1983

iTrader: (7)

And thanks for the tip on viewing CSV files, this will make life much easier.