47 replies to this topic

[TFD]

Hi people,

 

tried a lot of stuff now but need a hand here,

 

Setup:

Z22SE

470cc blue inj.

2.5 TMAP

Turbo 

OBD Tuner

 

What happens?

 

Car starts up fine, no problem

When at idle it gives some puffs every now and then. Not a smooth steady idle. You can see this in the logs. Rpm, TB valve and MAP are bouncing a bit up and down.

When I slowly push the throttle it seems to go well, but with a slight puff/hesitation now and then.

When I push the throttle fast it bogs badly like its chocking and tends to stall. It never stalls cause it can get up pace fast enough once let go off the throttle.

When this bogging happens the car is smoking and tyhe spark plugs came out black within just 5 minutes of running the engine.

 

Other then that all is well. Car drives good.

 

Things I did:

 

Cleaned TB

Cleaned coil pack

Changed spark plugs back to OEM

Sprayed all connectors

Checked spark plugs -> Looked good.

 

Other things I read are:

Intake leak. Tested this and seems fine, but not 100% sure since its shitty to do yourself..)

Leaky injector (how to check?)

 

Thanx for input guys!

 

Grtz,

TFD

 

 

 

Edited by TFD, 19 May 2017 - 02:56 PM.

[CHILL Gone DUTCH]

do you think it's overfueling causing black plugs or oil ??

[CHILL Gone DUTCH]

Check the cam cover pipe and if there's any oil in there That's if it's running to inlet

[TFD]

Smoke is white and the black on the plugs is carbon. I think its fuel for sure. The camcover pipe is routed to a catchcan with breather. Only thing routed back into the intake (pre turbo) is the gastank pressure valve hose thing. This was done as a test as well to eliminate a vacuumleak from that connection. Didn't change nothing.

 

Logs show around 10.7 - 11.1 on the dips and then correct towards 11.6ish. These values are linked back to the transient table.

Edited by TFD, 19 May 2017 - 03:12 PM.

[CHILL Gone DUTCH]

did you try to increase the ignition in troubled area

[TFD]

Yes. At 30 kpa the timing is set at 11,4 instead of 5,4 in the idle table. Adjusting this didn't make it work 100%.

 

[CHILL Gone DUTCH]

Try to increase it to 25 on the main table Then try it on the idle table

[CHILL Gone DUTCH]

[CHILL Gone DUTCH]

As you revs increase your map decreases so be sure to get the right area and the 9 boxes around it

[CHILL Gone DUTCH]

could this being caused by some kind of boost dump ??

[CHILL Gone DUTCH]

OR could it be the boost going through the intercooler

[TFD]

The thing is that I think this situation should be ( almost) the same as when oem 2.2 n/a. Stock TB and engine just idle and a bit reving. Should be no big deal if you ask me. Not big enough to completely rebuild the maps in that particular area. Any leaks or bad stuff pre TB should not be a problem since the air is meassured in the intake manifold by the TMAP sensor. A boostleak for instance shouldnt be a problem at all. I'll try some maps tonight including the stock z22se map, but my gutfeeling goes towards a mechanical issue. Going to test the TB and coilpack with Smiley.

[TFD]

Loaded the OEM transient map in and less hunting, less (no) smoke but still bogging. On accel AFR dropped till 9,XX so a tad less fuel correction in the transientmap is needed.

Tomorrow another day.

[smiley]

Going to test the TB and coilpack with Smiley.

 

Laying ready on the dinner table. (the coilpack and TB)

 

[Exmantaa]

Daan,

 

Is the transient tab in OBD not a "live" accessible table so you can change settings on the fly? During logging it probably also shows where you are in the tables...

[TFD]

Yes, thats why I know where the fuel% is to high. Only thing is the delay in afr readings. When afr reads 9,xx you should go 1 step backwsrds in time to find the momment in the transienttable that made this fuelcorrection happens. All other actions are "on the spot", but afr is meassured about 1m away from where the combustion tiok place. So there is a delay. @ Smiley: Thanx

Edited by TFD, 20 May 2017 - 06:04 AM.

[TFD]

Little update:

 

Adjusted the fule % corrections in the transient and when pushed all goes to 10.9 afr. Still to rich but better. Adjusted the ignitiontiming in the ignition table and I can pull off in 1st now without touching the throttle. Even revving at idle goes way smoother than it was. Still a tiny hesitationm but we're getting there.

 

Now the important thing:

 

AFR delay time:

 

As you can see, the fuel correction seems to happen a tad after the acc. is pushed. Funny thing is that at the crosshair (10.4 afr) the fueltable allready is at 20kPa/coasting (like the rest of the parameters).

I think that the afr timing is not corresponding with the actual reading. In OBD the delay is set at 90 ms but log delay seems about 1,5 sec. Will ask Peter about this as well.

 

An answer would be great... so you can tell if the knock is due lean mixture of something else.

 

 

Edited by TFD, 20 May 2017 - 09:48 AM.

[CHILL Gone DUTCH]

what wide band are you using ??

 

[CHILL Gone DUTCH]

peter has been doing some recent work on the wideband settings in pro 

[TFD]

Innovate LC2