tuning questions mostly F29 table

[cvcsmkr]

1. my mass air pressure(calculated 3 bar from 1 bar variable) is reading 200+ (thru the aldl values) when i go wot. isnt this pass the range of the f29 table? paul answered, thanks

2. whiling tuning f29 for drivablilty (maintaining one speed, adjust f29, then maintain another speed, adjust f29) my afrs are about 17-18. is this lean for cruising? thanks JS

3. when i turn on ac while in D or R the truck dies, is there a seperate table for adjusting idle when ac is on? or do i have to do it from the f29c table? answered, thanks

4. also if i get going to about 10 mph i can let off throttle and the truck will never lose speed, with 0 tps, is this normal, could a vac leak cause this? answered, thanks
thanks in advance

 

[QUICK STORM]

Re: tuning questions mostly F29 table

i assume that you have read the fuel tuning stickies, but 17-18 afrs are way to lean for this table, get it into the 11s or 12s.

 

[skwayb]

Re: tuning questions mostly F29 table

On the F29 table you can only tune up to 100 kPa (0 PSI), then this is where the F77 Boost Multipler comes in. It provides more fuel with a multipler that helps increase the BPW of the injector.

Learn this formula from the P4 manual and it will help you understand how.

BPW = BPC * MAPP * T' * A/F' * VE * F33C * BLM * DFCO * DE * CLT * F77

BPW = Base Pulse Width - How long the injector is to stay open
BPC = Base Pulse Constant Term - Is the F28 table
MAPP = Manifold Pressure Term
T' = Inverse Temperature Term
A/F' = Inverse Air Fuel Ratio Term
VE = Volumetric Efficiency Term (Both the F29 + F30 table make your total VE. It cannot go over 100 VE with both these numbers added together
F33C = Battery Voltage Correction Term
BLM = Block Learn Correction Term
DFCO = Decel Fuel Cutoff Term
DE = Decel Enleanment Term
CLT = Closed Loop Correction Term
F77 = Turbo Boost Multiplier

Now on the Code59 we are working on, the F29x table goes from 400 - 6400 RPMs and 0 - 300 kPa so you will be able to tune sections above 0 PSI.

This should chart should help you so you know what the ECM thinks is boost and how much it is.
Approx PSI conversions.
100 kPa = 0 PSI
200 kPa = 15 PSI
300 kPa = 30 PSI

 

[cvcsmkr]

Re: tuning questions mostly F29 table

On the F29 table you can only tune up to 100 kPa (0 PSI), then this is where the F77 Boost Multipler comes in. It provides more fuel with a multipler that helps increase the BPW of the injector.

This should chart should help you so you know what the ECM thinks is boost and how much it is.
Approx PSI conversions.
100 kPa = 0 PSI
200 kPa = 15 PSI
300 kPa = 30 PSI

thats exactly wwhat im looking for.
thanks

 

[cvcsmkr]

Re: tuning questions mostly F29 table

i assume that you have read the fuel tuning stickies, but 17-18 afrs are way to lean for this table, get it into the 11s or 12s.

maybe i didnt explain it correctly.
i should be in 11's or 12's just for cruising? maintaining one speed?
that just seems a little rich to me, but i am just learning.

 

[JSM]

Re: tuning questions mostly F29 table

I set cruising for ~14.7, then phase it to ~12:1 as the boost rolls in. If you have alky then about 11:1 as boost rolls in.

 

[leroy]

Re: tuning questions mostly F29 table

maybe i didnt explain it correctly.
i should be in 11's or 12's just for cruising? maintaining one speed?
that just seems a little rich to me, but i am just learning.

IMO, shoot for 15-16 afr for cruising. Go richer in the higher MAP areas. It may be possible to go even higher. That's assuming you are running open loop.

If you can take the time, lean out the cruise areas of the table to obtain the lowest throttle opening. That should give the best economy.

Jim

 

[cvcsmkr]

Re: tuning questions mostly F29 table

thanks for the reply JS.

what do you think about question 3 & 4?

 

[JSM]

Re: tuning questions mostly F29 table

#3 and 4 can't be solved until you have good VE table. Once you have those I suspect #4 will go away, #3 might.

What is your desired idle rpm? There is a table for idle with AC on you may want to change.

Again if the VE tables are off it might cause these issues anyways.

 

[skwayb]

Re: tuning questions mostly F29 table

whiling tuning f29 for drivablilty (maintaining one speed, adjust f29, then maintain another speed, adjust f29) my afrs are about 17-18. is this lean for cruising????

Up the VE numbers in the F29 cells that TunerPro currently shows you are in to get the AFR numbers to be closer in the 14.7 range. Aprox 4 VE = 1 AFR. This varies per turck but on a stock setup it is pretty close.

when i turn on ac while in D or R the truck dies, is there a seperate table for adjusting idle when ac is on? or do i have to do it from the f29c table????

Yes when the throttle is closed it uses the F29c table. You will need to tune this table to get your idle smooth. Also look at your IAC count. If it is way high you will want to adjust the throttle screw to bring them down. I think 20 is the recommended number for the IAC count at idle. I could be wrong, I don't remember exactly what it should be. There is an old BG post on here about the numbers in datamaster what they mean and what the recommended numbers for various things like IAC should be. I will try to find it.

No to tune the F29c table, watch what cells it is in and adjust the VE numbers until you get the idle dead on for 14.7. Then put it in Gear with the brakes on and see what cells you are in and then adjust those until you are at 14.7. Do the same thing with the AC on when in Park and when in Gear with the brakes on. After you got the stall from stopping when putting it in gear, you will want to play with the AFR to see what your truck likes best at idle to make it smooth. Some like it richer in the 13.5 range, others like it leaner at 14.2-14.7. It all depends on the truck.

Also some trucks like a higher RPM for idle. I set mine at 850 in idle when in D and Park. It sure helped mine. The IDLE RPM you want to run is a personal choice. Some like it higher and some like it lower.

Give those things a try and see if it helps.

 

[cvcsmkr]

Re: tuning questions mostly F29 table

thank you very much for the replys this is helping out a ton.

ive been tuning the f29c table for about a week and i have it very good, in gear and out of gear, but i didnt want to screw that all up just for ac.

ill try to look for a ac/idle table again.

ill keep that higher idle speed in mind paul, thanks.

 

[JSM]

Re: tuning questions mostly F29 table

You will like to know so far the new chip has better idle quality on trucks I have tested it on...........

 

[cvcsmkr]

Re: tuning questions mostly F29 table

thats awesome, i CANT WAIT!!
this is like the ultimate teaser.

 

[QUICK STORM]

Re: tuning questions mostly F29 table

maybe i didnt explain it correctly.
i should be in 11's or 12's just for cruising? maintaining one speed?
that just seems a little rich to me, but i am just learning.

me too, but i was under the assumption that the F29 table was a idle table not cruise, but it looks like you've got the help you already need.

 

[JSM]

Re: tuning questions mostly F29 table

F29 is NON TPS >1% and/or rpm over 1200.

F29c TPS < 1% rpm <1200 rpm

F29x is new chip table the is expanded. Not in stock chips.

 

[turbodig]

Re: tuning questions mostly F29 table

F29 is NON TPS >1% and/or rpm over 1200.

F29c TPS < 1% rpm <1200 rpm

F29x is new chip table the is expanded. Not in stock chips.

Actually, the TPS threshold is higher than that, but the point is still the same.

Later,