After my dyno 2 tuning session, I added some timing advance between 5000 and 8000 rpm which seems to help, but has not been dynoed. That is were I had the big dip in the torque curve. This increase matches what was in that area for some single tubo maps and is close to the stock base maps.

Then we had some very cold and dry weather. The engine started getting high noise levels in the low revs from about 3500 to 5000 rpm. I reduce my timing there back to about dyno 1 settings. My noise levels are again low even in cold weather.

I leaned out fuel on a few upper fuel cells (above 6000rpm) by 1%, and also removed fuel on the PIMS map from 103.9% to 103.1%. By the way, my dyno runs were with 105% PIMS which reduced power. But then I wanted it cooler since I was advancing tiiming back then.

I have rigged up an Apexi 60mm IGT gauge as a piece of mobil test equipment. The probe fits into the O2 sensor bung and the meter resides in a plastic box. Saturday Kyle and I went out to do some more UEGO O2 sensor tests with the EGT gauge. Traffic was very heavy so we could not do too much. With my above leaning out of the fuel, my AFRs were in the 11.8 range at the low end down to the 11.4 on the high revs. Made one run starting in third up to 150mph before hitting traffic. My max EGT was 825C, just right!

The car is running very well and smooth. This was tested on the way to and back back from the WIC in Baytown yesterday. Including shutting down a SVT Lightning from 80MPH in 4th.

My current maps are attached.

Intake: M2 hard pipes with K&N filters.
Non-seq turbos with clipped turbine wheels.
Compressor outlets enlarged. Turbo housing modified for smoother exhaust flow. Enlarged WG.
Efini "Y" pipe set.
Blitz FMIC.
Greddy throttle body inlet elbow.
Secondary vacuum throttle plates and their center support removed.
The complete intake system is port matched to the metal gaskets from the turbo compressor outlets to the side housing intake manifold gasket. Intake port sizes are stock.
The exhaust is ported.
Engine rotating parts were dynamically balanced.
Mind Train down pipe.
Shane Racing resonated MP.
HKS turbo cat back exhaust.
SR power pulley.
Racing Beat aluminum flywheel.
ACT street/strip clutch.
Apexi PFC with commander.
NipponDenso high performance fuel pump.
1200cc secondary injectors.
Craine HI-6R.
Taylor spark plug wires.

 

Chuck,

Think you could post the .dat file from the datalogit?

Thanks,
Alan

 

Since this site will not let me load a DAT file, I have renamed it TXT.

 

Thanks!

 

Looks like the file got corrupted somehow. I'll just cut and paste.

Alan

 

Did you rename it back to *.dat before loading it?

 

where is your EGT mounted...BTW

 

I renamed it of course and it will load in FC Edit but the only valid numbers appear to be the first 5 IGL columns. There is nothing for the settings pages and all other map values are -25 for timing, 0.5 for INJ, and 0 for base. I've found a file formatting bug in the current software version (if any of the text entered in the comments box contains a comma, the file cannot be opened again) so maybe this is another one. Can you download and open it? Has anyone else tried?

Alan

 

Here is one of mine, just to see if it survives the up/download in-tact.

Alan

 

My egt probe was mounted in the O2 sensor bung on the outside curve of the DP about 4" from the turbo housing DP port.

A friend has the datalogit that we been testing. He has not loaded the most current software yet. It still has the BETA verison on it.

I have him download yours and try it. My dat was set by him to me after downloading it from his PC.

 

Chuck,

Down to what row is your map wide band / dyno tuned?

I wouldn't recommend using the map I attached. It's the XS Engineering map which is garbage. My car never ran right on it and it's full of mistakes, I suspect it's a big single turbo map.

Alan

 

Sorry I know this is off topic but.....

Adax, I know we sent our PFC's to xs around the same time for the same exact mods. What were your 02's before you messed with it? Before touching anything once I got my car back together with the XS "tuned" map for my mods my 02 was at an unreal figure of 1.25 under wot at 15psi of boost!!!!!! What was your like?

Thats some tune huh

I'd say it was a tad rich lol

Later,
STEPHEN

 

The sensor was reading around 0.97 FWIW. The car was so rich it essentially would not run. When the secondaries came on, it would buck and stumble all the way to redline. I mistakenly diagnosed this as an ignition problem because the plugs looked fine (not fouled) and the symptoms suggested it. So I replaced the plug wires and primary coil, to no effect. With nothing else to try (other than new 1300 cc secondaries) I started leaning it out as a last resort with my fingers crossed. This improved it a little at low boost but it still stumbled bad when the secondaries started to stage. I then loaded Chuck's maps and it runs great for the first time in 6 months (a long story). Now waiting for my DIY wideband which is plug & play with the latest datalogit update.

From the Datalogit, things were pretty screwed up in my opinion. Changing to 1300 cc secondaries actually requires alteing the initial pulse-width (from 1.5 ms to 0.98 which is 850/1300 * 1.5 ms) in order to get a smooth transition which can only be done with power XL or datalogit software. They didn't do this. Otherwise too much fuel is injected during transition. They also screwed around with the injector overlap settings under boost, again making it too rich. The sloppy timing maps have already been discussed in previous threads, as well as your non-seq problem, altered stock primary lag time, etc.

Also, be warned, if you load an XS map into datalogit, their password or "tuner string" will activate the anit-lag feature. Be sure to disable it.

Like I said earlier, I expect to be disappointed, but these guys are exceeding my wildest expectations.

Alan

 

Chuck when you say your engine started to make some noise, what are you considering noise? I know your speaking about knock. what numbers do you consider "noisey"?

 

I have used the UEGO linear O2 sensor on boost at 10, 12, and 14 PSI; and my AFRs were fine as my latest map has them. Infact at 14 psi they were richer than at 12psi. This equals rows P16 to P18. With the PIM % at 103.1% the AFRs are in the high 11's. With 103.9%, they are more closer to medium 11s.

I have not gone above 14PSI boost yet. My last dyno run is posted on this forum. It was run a little richer (105% PIM) and needed more timing above 6000 rpm.
It was about 312RWHP and 269FTLBS. With the leaner fuel and more timing above 6000, it should at leaste 320.

I plan to do some more14PSI tuning soon and then dyno the car again.

The noise I was referring to was higher knock levels.
Some to around 100. It was between 4000 to 5000 rpm.
Since my two dyno sessions showed the timing changes has less affect down lower than higher, I played it safer.

 

Hey Chuck, I'm curious about something and since you've been using a wideband you might have looked at this.

(Chuck I know you know all this I'm really just spelling it out for the people that dont know it or dont have a datalogit manual)

In the datalogit manual on page 20 the top paragraph talks about the Fuel Correction Map and how the correction figures input relate back to a certain AF ratio mixture. It says the base map represents the thearetical ideal mixture 14.57:1 for a stock 13B-REW. Then it shows the formula that the correction map uses which is ..........
14.57/desired AF = the figure to plug into the correction map.

In other words if you wanted a AF ratio of 12:1 you would do this.......... 14.57 / 12 = 1.214 so you would just type 1.214 into a given field of the correction map and theoretically get the 12:1 AFR for that field.

According to your wideband how accurate is this for your car???? Dont worry I'm not planning on tuning my car this way lol I'm just curious is all

Thanks,
STEPHEN

 

Any mod that affects breathing will invalidate this formular because the engine needs more fuel because of it. You would have to have the base maps changed to reflect the increased breathing first.

I did notice that after logging a linear O2 run. You can then use the recoded AFR for a RPM/fuel cell arear to calculate desired AFRs. This requires also knowing what
fuel cells you were in. Do this by running a ghost map trace. With the datalogit, it records all of this.

(recorded AFR/desired AFR) * (fuel cell value) works fairly close.

 

Great, thats nice to know. It sounds like that could really make tuning faster and easier if I'm understanding you right. You basically saying if I'm in a certain field thats real rich and lets say its a 10:1 AFR according to a widedband I could do something like 10 / 11.5 = cell value to achieve the 11.5afr

To me thats much faster than just playing around with it while on the dyno till it gets where it needs to be.

I can make one run with a wideband datalogged and a ghost trace map then go sit on my computer at the house and change all the fields accordingly then just reload the changes to check them on the wideband and make sure everything is ok.

I'm I understanding you right?

BTW - do you make most of your fuel changes thru the correction map or the base map?

Later,
STEPHEN

 

I have left the base map alone, and do all in the correction maps and PIM maps.


For your example , it should be

(10 / 11.5)*(value in cell causing the 10) = new cell value.

 

Chuck,

I changed the pri/sec time to 0.76 for my 1680cc injectors and used 0.05 lag time and the transition is real smooth. Who says the PowerFC can't control large injectors!

 

Sorry, but your braggin' does not cause me to have "large injector" envy. I am satified with my "1200s".

 

I would like to check out your new map, mostly to compare timing. I have been looking at other peoples maps and the timing values are a lot lower on mine. I put it on the dyno today and was hoping for a little better (325hp, 290tq). The a/f is a little rich, it started out about 11.5 up to 7000 where it went down to 12.8. I richened it up at the top and got that down to the mid 11's, but I guess from the car warming up the rest of my a/f went to the high 10's by my 4th pull. I figured I would look into the timing and get it back on the dyno before I start pulling out fuel. I'm really not too sure what I'm doing with this thing yet, but would like to compare my maps, what programs are you guys using to look at these, I don't have excel, is there anything else that I can use. If you read this Chuck, could you please email me your new maps, I would really appreciate it.

Thanks,

Nick
melon350@aol.com