04 Silverado turbo 6.0 help.

[Janke]

Yea I'm missing some major power cuz when mine spools it's not impressive. What injectors are you running and what type of fuel system? I've got 60ld's, twin intanks, and return style.

[64camino]

Injectors are regular old siemens/mototron 60s. Single intank walbro255. At 17-18lbs(the most i've pushed it) it still had 11.5 afr(after leaning it down from 11.0). I would love to try e-85, but none around here, and I know I would need more pump. I already looked into the new aeromotive 340 in tank.

[Janke]

I probably should have gotten the tune ironed out on pump gas first but I was to eager to try e85 since the station down the street has it on tap. I'm sure its my tune but my gas mileage is horrible, but it smells good.

[Janke]

Can anyone point me in the direction on a thread that shows me how to calculate injector flow rates for a return style fuel system?

[joecar]

See the spreadsheet here: showthread.php?4821-Calculating-Injector-Flow-rate

[Janke]

ok so check my math Im pretty sure I have it correct. 60*sqrt((60)/43.5) =70.4664lb/hr=8.8786g/s I have a map referenced regulator on the rail with vac hose attached it measures 58, with it removed it measures 60

[joecar]

So, your injectors are rated to flow 60lb/hr @ 43.5 psi, and your FPR-exposed-to-BARO rail pressure is measured to be 60 psi...

your IFR calculation looks correct and my calculator gives the same numbers;

for MAP-referenced FPR, the calculated IFR value is used in all cells of the IFR table (flat static).

[Janke]

Ok my next question pertains to e85 part of it. In table B3601 do I plug in 9.765 or equivalent afr as per plx website, which I think is 14.57?

"All PLX wideband air/fuel ratio devices are compatible with E85 fuel. E85 consists of a blend of 85% ethanol and 15% petroleum and it is becoming a popular alternative fuel worldwide. Perfect combustion is defined as 1.0 lambda or 9.855 air/fuel ratio for E85. Here are some equations to help you calculate your air/fuel ratio.

Air/Fuel Ratio (E85) = 9.855 x lambda

Air/Fuel Ratio (E85) = 0.67 x Air/Fuel Ratio (Gasoline) "

Fuel ........................ AFRst ........ FARst ....... Equivalence Ratio ... Lambda
E85 stoich .................. 9.765 ....... 0.10235 ............ 1 ................... 1

[joecar]

Set B3601 to 9.765, or 9.77, or 9.8.

Then from your PLX use Lambda to correct the commanded fuel...

e.g. in your calc_pids.txt file define BEN to be "{GM.EQIVRATIO}*{EXT.WO2LAM1}"

See CALC.WO2BEN in attached file.

Do you FlashScan V1 or V2...?

[Janke]

Im using v2. Ok so I believe my cal_pids file is already correct? "Then from your PLX use Lambda to correct the commanded fuel..." Elaborate on this please. Im using analog signal from plx btw.
calc_pids.txt