Yes. (qualified).
Ignition timing should be the only declining variable as flow increases.
The "qualification" is that, at some point, you will exceed the AKI of the fuel and significant reductions in ignition timing will be counterproductive, so as a safety margin in the event of overboost, I will add 1 point of AFR at the end of the effective Ve of the system.

 

Okay, here's the graph

 

If I am reading that right, you are stopping the graph before 4000 k RPM?
It is supposed to be very lean in that range.

I thought you were having lean issues in the 6k and up range.

EDIT - Reading comprehension FML.
Unless you are touching 15:1 below 4k, that is pretty normal. Even the FI applications are kept in the 13:1 range at full boost below 4k.

 

Last Saturday the 2nd, I made a run on MMCCS v4.0.1 and logged this data. This is a complete data log of every variable for 2nd gear WOT and then 3rd gear WOT.

Looks lean under 3rd gear - I was watching and almost aborted the run... Or is this just the transition from closed loop to open loop?

edit: I zeroed out the transition

 

MAF/3?
lol - Making us work for it.

The lean spots are a bit too lean, but it isn't an area that you will have problems.
The transition and power ranges are still rough.

 

I wish I had more track to get up to 9K - gotta play safe out there.

edit - fixed xls to include mph

 

That axis scale is exagerated for resolution also.

edit: Here is the complete run charted and updated 10/10/10

 

A question from a friend... If one has just recently overhauled the engine, does he has to finish running in the engine first before sending his datalogs or he can do it whilst still running in his engine?

 

I assume you are talking about Jeff's MMCCS e-tune program, correct? I bet you could run the base map, log idle and cruise, and submit those. Run on v4.0.1 map for awhile, until your engine is broke in, then reset the ecu, do your two drive cycles and then go log again with idle, cruise, and 2/3 wot. I would not run WOT until your are comfortable with your breakin procedure.

 

Tried again to log this map better for Jeff. I think the only good method for data logging with the AP is on a dyno in a controlled enviorment, without having to worry about the track ahead. Maybe a two person session would work better.

 

Here's my AFR from a WOT pull

Edit: Redid the plot with better looking results

 

I use the Hymee Scanalyzer on a laptop to log, and it works great IMO. You can view 6 gauges at once full screen and and you can set parameters as to when the logging start, etc. I always forget to start and stop the log on teh Cobb, I guess it just takes getting used too.

 

Why not use my XLS? Here is your run charted out.

edit; made a wide screen version

 

I have to learn to use Excel properly.

 

I wrote this awhile back, and used macros. Now I just struggle to get it to work, but I think it is all coming back to me know.

DarkBrew - you map is not as lean as you thought. Compare it to mine. You can see the jump from closed loop to open loop, by looking at your AFR plunging rich, just about where your calculated load jumps up. Also, instead of throttle position, use the accelerator position.

 

I'm a bit worried about the AFR spikes between 4K and 6K... up over 15!

accelerator position... noted!

 

Don't look at your chart, look at your log. I see 14.26 - 12.35 from 4K-6K, and that is also where your transition takes place due to calculated load.

 

Grrrr
I only have Open Office at home
Excel is at work...
Thanks for the reassurance.
I'll get a new set of logs into Jeff and see what comes of it

 

Here is a version written in Excel 2003. I have both now, one for Excel 2007 also.

Notice this version has the gears all separated for better AFR resolution in each gear.

 

Data log of NASA time trial last weekend at SP
SP is a ten turn two mile track
I was turning 1:28/9s all w/e
HP weather 40-55 degree F
Fuel Trims look good?
Running on MM base tune
Low AFR's (11's) at WOT
Comments/questions

 

As promised MMCSV4.1 WOT runs

 

Bump!!!

@ Darn, your roughly where im at but I dont hit 240g/s, im around 235g/s...

Lets get some more logs!!!

Heres mine on my new engine... On this log I redline gears 2-4....

https://spreadsheets.google.com/ccc?...thkey=CLKK39oH

 

Did you data log on a dyno?

 

Nope... On a flat empty service road that is unpopulated and safe enough to get to that speed

 

OMG! 130 mph. That's 190 ft /sec.
I have only been up to 125mph+ on the track
I do all my datalogs on a dyno.
It costs between $50-$75 for multiple pulls in No. VA.