tuning boost with $58

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Jan 17, 2006 | 04:58 PM

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

tuning boost with $58

I was using the $58 .xdf in tunerpro and looking at some stock bins. The VE table only goes to 100kPa. the spark table goes to 200kPa.

The question is... how do you adjust fuel when in boost?

Jan 17, 2006 | 05:12 PM

Grumpy

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Re: tuning boost with $58

Quote:

Originally posted by ttypecamaro
I was using the $58 .xdf in tunerpro and looking at some stock bins. The VE table only goes to 100kPa. the spark table goes to 200kPa.

The question is... how do you adjust fuel when in boost?

There should be another table.
Boost multiplier or some such thing.
It mutiplies the 100 K/Pa levels above 100 K/Pa.

Jan 17, 2006 | 05:53 PM

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

I figured it was something like that, but I can't figure out which table does that.

Jan 17, 2006 | 07:12 PM

RBob

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From: Chasing Electrons

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Quote:

Originally posted by ttypecamaro
I figured it was something like that, but I can't figure out which table does that.

I'm thinking this may be the table you are looking for:

Code:

/* Item 1: Base Boost Term */
{
/*startAddr                 =60D,
/*columns                   =1,
/*rows                      =11,
/*elementSize               =1,
/*bitMask                   =0,
/*offset                    =0,
/*mulOrDivOrBit             =0,
/*factor                    =0.0078125,
/*map_name                  =BOOST - Base Boost vs MAP,
/*ylabel                    =MAP,
/*yaxis                     =   90  100  110  120  130  140  150  160  170  180  190,
/*xlabel                    =Factr,
/*xaxis                     =,,
};

Multiplies the current PW by the table value based on boost level.

RBob.

Jan 17, 2006 | 08:16 PM

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

In the $58.bin file I am looking at, the values in the chart are mostly 1 with a few 1.7's at high MAP. Which pulsewidth is the current one? the one from the 100kPa column at current rpm after all multipliers? this seems like it would be running lean untill high boost (with 1.7 multiplier).

I hope this doesn't make me look like I don't know what I'm talking about, and I don't.

Jan 17, 2006 | 08:36 PM

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

I opened a different .bin file and opened the 'BOOST - base boost vs rpm' table. It looked different this time. It was a VE table with MAP across one axisfrom 38kPa to 100kPa. I want to assume that these are gauge pressures instead of absolute pressures. the VE's increase from 44 to 95 with MAP. There is also a 'VE adder' table with values around 30. so does this mean the VE of the stock sy/ty motor was about 125% at 14.7 psi? I guess that sounds reasonable.

I converted the PW's of my commander 950 program to approx. VE's for my motor using the injector flow rate and AFR. I got like 159% at 149kPa. that seems impossible, I guess the injectors are smaller than I think. Stock LT1's are 24 lb/hr, right? Or I used the wrong density of air and gasoline.

Jan 17, 2006 | 09:14 PM

RBob

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From: Chasing Electrons

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Quote:

Originally posted by ttypecamaro
I opened a different .bin file and opened the 'BOOST - base boost vs rpm' table. It looked different this time. It was a VE table with MAP across one axisfrom 38kPa to 100kPa.

Do you have the address for that table? And, what ECU/TDF file are you using?

RBob.

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Jan 17, 2006 | 09:22 PM

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

its a bbzb58.bin from moates.net and the 58RR_v14.xdf for tunerproRT v4.13

address: 03C2

6 rows
6 columns

Jan 18, 2006 | 07:42 AM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Quote:

Originally posted by ttypecamaro
its a bbzb58.bin from moates.net and the 58RR_v14.xdf for tunerproRT v4.13

address: 03C2

6 rows
6 columns

OK, that table is the desired boost for wastegate control. The table should be by TPS% and RPM.

RBob.

Jan 18, 2006 | 10:57 PM

#10

ttypecamaro

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From: Baltimore, MD

Car: 09 Cobalt SS Sedan. 92 Z28 vert

Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi

Transmission: F40; 700r4

Axle/Gears: 3.76 LSD; 3.23 posi

Quote:

Originally posted by RBob

Code:

/* Item 1: Base Boost Term */
{
/*startAddr                 =60D,
/*columns                   =1,
/*rows                      =11,
/*elementSize               =1,
/*bitMask                   =0,
/*offset                    =0,
/*mulOrDivOrBit             =0,
/*factor                    =0.0078125,
/*map_name                  =BOOST - Base Boost vs MAP,
/*ylabel                    =MAP,
/*yaxis                     =   90  100  110  120  130  140  150  160  170  180  190,
/*xlabel                    =Factr,
/*xaxis                     =,,
};

Multiplies the current PW by the table value based on boost level.

RBob. [/B]

I can see how this can help tune fuel in boost, but is there a table that depends on rpm also? or does it use the VE table and multply the VE by the boost pressure.

example of what I'm saying:
given:
355cid
4000rpm
MAP=150kPa

From VE% table:
VE[4000rpm,100kPa] = 54% (+30% adder)

so does it calculate:
'current VE' = 150kPa/100kPa(54%+30%) = 126%?

then calculate a 'current PW' for those current conditions according to injector flow rate... then multiply by the number in the table at 150kPa:
for example 1.07

to get: actual injector PW=1.07(current PW)

not counting other adders

It frustrates me when I don't know what the ecu is doing with the values in the tables.

Thanks