RomRaider

Hi:
These are the first WOT logs since I rebuilt my engine. Mods are:

CP forged pistons
GT Spec II headers with integrated uppipe
Invidia catted downpipe
Borla exhaust, replaced with AVO 3" mid-pipe -> Magnaflow muffler -> AVO Y-pipe -> AVO mufflers for the OBXT. Noted in this post.
DIY TGV Deletes (rods, motor and sensors remain)
Stock air box, filter, TMIC and turbo

The map is mickeyd2005's from post: topic4468.html
with 20% removed from the WG tables as suggested and 1.05 degrees timing removed from all cells above 1.5 g/rev.

Fuel is Ultramar 91
Today's temp in the morning was 48F and in the afternoon 57F.
Pressure 14.51.

Thanks,
Dale

You need to enable the WGDC ramping fix.

Also, reduce the base timing at 6200 rpm between 1.0 to 1.4 g/rev by 1.05 degrees.

What concerned you in that area of the timing?

There was a knock there in one of your logs when you let go of the throttle.

When I first started tuning, I wasn't sure if it was real or not because the d(load)/d(time) is really high as you let go of the throttle. However, I've been reducing timing in that transition area and the knock goes away.

I did see that but I wasn't sure if I should be concerned. It would seem that I should be.
Thanks for looking things over.
Dale

I don't know if it is dangerous or not. It's probably not that big a deal since it's in the stock tune.

However, if you can get rid of it, then I think you should.

I made the changes to my version 106 and logged some more. There is one log in there which is my drive to work after installing the changes to the ECU where I'm trying to see what all my low load/RPM knock noise is about.
Logs this evening taken at 55F and pressure 14.51.

My observations:

- I see a couple of knock increments during low load 3rd gear pulls and again in the deceleration of my 4th gear pull.
- I feel the engine kinda stumbling like it's bouncing off the boost limit...? If I graph the pressure I see it's jagged above 15psi, not nice and smooth. Is that the affect of -20% WGDC ?
- My low load knock looks like it might be the result of going slightly rich then overcompensating towards lean then settling in

Let me know what you think. I can knock a bit off at the knock points, anything else?

Thanks,
Dale

All the knock below 2000 rpm were almost all at low load. There's no guarantee that it's real knock. It could've been lugging the engine etc...

Where do you see the boost oscillating? The WOT logs were fairly smooth. 5th gear boost will be a little jagged but even on yours it was reasonably smooth.

I would subtract 1.05 degrees of timing at 6000+ rpm between 1.0 and 2.0 g/rev. That's the knock in 4th gear.

You also have a knock in your last 5th gear log. However, it was after driving for 17 seconds at WOT. I think it's just heat soak. I don't think anyone drives like that... Even 1/4 mile drag runs are only 13 seconds long. For 5th gear logs, you only need to do 2000 to 3000 rpm WOT logs. It's just to check overboosting and the timing in the upper right corner of the map.

Let me take a look at the rom. Your total timing doesn't look right. Are you sure you copied all the tables correctly? It looks like the ecu is switching back and forth between tables.

I know a bit of the low load is lugging, shifting into higher gear but letting the RPM drop below 2000.

The boost wasn't really an oscillation, more like something dragging on the car/engine. I think it was most noticeable in the 4th gear pull.

As for the timing adjustments I was thinking of trying this.

to see if it makes a difference down low and to account for the couple of knocks in the pull logs.

Heat soak at 55F? I guess I should take it easy as the road I use is right beside the police station

When I copied the tables from your base ROM to mine I used SimpleTune to do a comparison, then selected the tables that I wanted to copy over to make the changes. Then I dropped timing 1.05 degrees for all cells above 1.5g/rev.

Yes, you can heat soak at 55F. The TMIC is pretty small. If you are pulling WOT for 17 seconds, the TMIC will not be able to shed the heat.

I double checked what I did and the only thing I didn't copy over was the Per Injector Primary Fuel Offset Compensations, I kept my origin values and a couple of DTCs related to EGT as I kept my probe installed.

Here are today's logs after the changes I mentioned yesterday and mickeyd2005's suggested timing change. All logs are free of knock during the pull even during deceleration at the end.

Today was wet and it was raining lightly. I could feel the tires slipping a bit on the wet pavement during the 2nd gear pulls. They're still the OEM tires which I'll replace next spring when the snow tires are ready to come off from the winter months.

Temperature 48F and pressure 14.65.

What do you think?
Dale

I haven't had a chance to look at your rom yet, but I need to take a closer look.

In one of the 3rd gear and one of the 5th gear logs, the timing was super low. Even if IAM was low, it wouldn't have accounted for such a large drop in timing. I don't think your IAM Was dropping since you did a learning view before and after the logs. And, the knock sum wasn't incrementing during the WOT logs. In the next logs, add IAM (1-integer) just to be sure.

Yes I see that now. In the one 3rd gear pull the recorded timing was 2 but the primary and advance tables added together for that cell are about 10. Then I see in the last 5th gear pull the timing appears to be about 5 degrees low as well.

It looks like it's switching between tables.