Map editing

[skiptownmcat]

Steve, going back to the DBW table. I take it we have to do quite a few logs in different gears starting at different rpm's to get all of the table done? Or will a couple do, then "smooth" the rest in?

[skiptownmcat]

Steve, going back to the DBW table. I take it we have to do quite a few logs in different gears starting at different rpm's to get all of the table done? Or will a couple do, then "smooth" the rest in?

any help steve?

Log and tune attached, throttle still closing and i have no idea why?
Also, the maf g/s starts wavering around around 4.5-5.5k, i'm sure this is holding me back. is there anything i can do to help this?

actual and desired afr are very different (takes till 4.3k to come together) but when I did a log using the maf cal preset they were no more than .05 apart?

[Steve @ VersaTune]

Are you talking about the throttle closure starting at 6364 rpm? Increase the DBW at 1.563 at 6000 and 6500. Your APP req load is calling for 1.6 load at 6500 so it is interpolating between those values and the values above.

There is a small MAP bump at 4900 that is causing a corresponding rise in MAF. You are all out of turbo at 260 g/s at ~5500.

As for the DBW table calibration, yes you will need to do a fair bit of logging to get it dialed in. It helps to smooth out power delivery.

The logging preset shouldn't make any difference. I would expect to see the same AFR deviation in a WOT run with the MAF Cal preset. Remember that fuel trims are not applied during open loop operation.

[skiptownmcat]

I'm talking about the throttle closure at the start, it starts at 70% and only goes to 75% near 5500 rpm even though my app is 100%. It's causing that dip in load at 3.5k, It just looks kind of messy and I'm sure it could be better. Should I try to smooth the app req load to get that g/s curve smooth?
Anyway the good news is my boost is not spiking as much, I revised the BCS base, I had been raising loads without re-doing that table.

I only went wot @3.3k so I'm presuming the difference in afr up to 4.3k is the time it takes to transition from cl to ol?

Good job I have a pg reworked turbo coming in January, my car actually feels slow now I'm used to going wot everywhere

[Steve @ VersaTune]

75% is max throttle. It takes it a little time to go the last few percent. It averages in previous throttle opening values in order to smooth the throttle response. The throttle is not causing that little dip in load at 3531 rpm. If your APP req load is all over the place, your load and g/s will be too.

[skiptownmcat]

Hmmm.. my req load doesn't dip like that so that's why I thought it was the throttle causing it, Maybe it's because it ramps up quickly then levels out and the ecu is just trying to make it as smooth as possible?
I shall go away and do some fettling!!

[laxplayermjd]

Hmmm.. my req load doesn't dip like that so that's why I thought it was the throttle causing it, Maybe it's because it ramps up quickly then levels out and the ecu is just trying to make it as smooth as possible?
I shall go away and do some fettling!!

just wondering why you chose that turbo? I personally like the BNR stage 3 turbo, Its basically a direct bolt in GT2871 for a great price.

[skiptownmcat]

Hmmm.. my req load doesn't dip like that so that's why I thought it was the throttle causing it, Maybe it's because it ramps up quickly then levels out and the ecu is just trying to make it as smooth as possible?
I shall go away and do some fettling!!

just wondering why you chose that turbo? I personally like the BNR stage 3 turbo, Its basically a direct bolt in GT2871 for a great price.

Simply for the cost, I have already bought the donor turbo off someone on msf. I can have it reworked and sent to me for $700. Bearing in mind I'll also have to pay an extra 20% import tax when it arrives here, pg will mark down the price as $400 so a grand total of $875.
bnr stage 3 will cost $1100 with no mark down, so total cost is $1375. big difference.

[manselainen]

Nice boost in the beginning (no spiking) and in the end, maybe you could have some more load/boost at middle RPM's.

For some reason it does not show KR curve on my PC even if data is there, I have had that several times earlier as well (but not always). Any ideas Ugnius or Steve? Maybe because it's all zeros?

You have more boost and less load than I seem to have, wonder why is that. My log (attached, pull at 362 secs, was taken at 0 degrees C.

I've been modifying my MAF cal after almost every logged pull, by comparing desired and actual lambda, adding 1% here and there, and I still have some differences. When comparing those 2 it's difficult (and sometimes impossible) to set scaling of curves exactly same.

[Steve @ VersaTune]

Load is subject to MAF scaling since load is based on MAF. A very free flowing exhaust will make more load with less boost. The intercooler pressure drop affects the MAP/Load relationship too.

VT auto scales the data so that the highest data point is at the top and the lowest is at the bottom. So, if all data points are zero in a particular PID, it will be a solid line on the bottom of the graph.