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LinkPlus G1 Master Fuel / Zone Fuel Values


Esa Hintsala
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I have Master Fuel setting 127. When in dyno, it seemed that adding Zone Fuel did not make much change for fuel mixture. We ended up with the best mixture and power output with highest value of 188 in 5250 rpm in Zone Fuel. I realized the possibility of Master Fuel setting afterwards, and now I am wondering should we have first increased Master Fuel instead of adding Zone Fuel more and more. I mean that does the Master Fuel reduce the Zone Fuel (does it work somehow as a limit for Zone Fuel)? Zone fuel maximum is 255 and I have now maximum 188 there, so it looks like that there still is room for adding Zone Fuel only without increasing Master Fuel? Or should I go back to Dyno again and try increasing of Master Fuel first and after this the Zone Fuel? Or is the result same when adding Zone Fuel only? Engine: Ford Zetec-E 2.0 1999 Firmware version: LPV14a 26/11/03 Pcl file: [ConfigByteSize]1 [Memo] [ConfigData],92,0,0,0,146,2,234,1,23,0,0,0,43,0,0,0,0,0,1,2,9,0,10,2,136,0,0,0,98,100,97,32,49,50,53,48,32,61,62,32,49,53,48,48,32,114,112,109,80,0,0,0,199,9,0,0,0,0,0,0,180,9,0,0,34,67,111,108,100,32,101,116,99,34,44,34,40,77,97,112,32,56,51,44,32,51,51,44,32,68,101,99 [LinkMemData],35,127,75,115,53,37,180,15,20,94,48,242,6,60,35,32,30,45,50,52,4,17,16,16,16,16,41,41,41,85,103,103,4,255,103,40,62,140,6,5,21,47,15,20,24,30,50,6,80,10,1,20,160,1,0,32,2,5,20,0,68,62,81,95,102,106,108,109,109,109,109,110,110,110,110,110,110,110,103,103,86,86,87,88,92,100,113,121,126,128,128,127,124,118,113,108,105,105,105,105,93,97,101,105,107,99,92,111,131,138,142,143,140,135,124,115,110,106,106,106,104,110,114,118,121,108,105,133,144,151,152,152,147,141,135,118,114,114,114,114,124,126,128,130,131,127,127,136,146,152,152,152,148,146,140,122,120,120,120,121,130,133,135,137,137,136,140,144,155,158,159,158,153,150,144,131,130,130,130,130,142,143,144,146,148,147,150,154,166,174,175,172,165,156,150,144,140,137,137,140,153,155,157,158,159,158,160,165,178,186,188,182,173,165,160,154,152,150,147,145,153,155,157,158,159,158,160,165,178,186,188,182,173,165,160,154,152,150,147,145,153,155,157,158,159,158,160,165,178,186,188,182,173,165,160,154,152,150,147,145,15,15,5,0,20,29,32,33,33,33,33,33,33,33,35,35,35,35,35,35,7,10,16,22,28,32,33,34,34,34,34,34,34,34,34,34,34,34,34,34,13,13,18,23,28,32,33,33,33,33,33,33,33,33,33,33,33,33,33,33,8,13,18,22,24,26,28,29,30,30,30,30,30,30,30,30,30,30,31,31,8,13,18,22,24,26,28,29,30,30,30,30,30,30,30,30,30,30,31,31,8,13,18,24,25,25,25,25,26,27,29,30,31,31,31,31,31,31,31,31,8,13,23,25,25,25,25,25,26,27,29,30,31,31,31,31,31,31,31,31,13,18,23,25,25,25,25,25,26,27,27,28,28,28,28,28,28,28,28,29,13,18,23,25,25,25,25,25,26,27,27,28,28,28,28,28,28,28,28,28,13,18,23,25,25,25,25,25,26,27,27,28,28,28,28,28,28,28,28,28,100,100,100,100,100,100,100,100,100,100,105,105,105,105,105,105,105,105,105,105,30,25,40,0,8,90,55,0,0,0,0,50,10,26,10,124,0,0,0,10,2,8,52,10,0,46,82,32,0,68,15,0,64,0,0,0,0,0,0,0,0,0,161,160,32,33,34,5,114,171,128,97,138,139,224,195,225,226,162,163,130,129,3,6,260,261,7,120,112,113,38,165,166,131,172,121,164,196,78,116,115,173,227,194,18,197,177,178,175,9,19,132,228,0,391,392,393,126,127,199,0,185,231,83,0,0,0,1100,1121,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1122,1123,1115,1116,1117,1118,1119,1120,2,1131,2,2,1134,2,1136,1137,2,2,1140,1141,1142,1143,1144,1145,370,371,2,2,2,2,2,2,378,379,380,381,382,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 [CheckSum]37951

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Master is like a coarse adjustment for all fueling, while the zone values are a fine adjustment.  The best value for master depends on the range of zone values used.

If your zones range from 130 to 188 then you could have a lower master and maybe range zones from 80 to 130, but the final result would be the same.

Did you check the injector duty cycle wasn't at 100%.  That would explain no change when increasing zone values.  Also inadequate fuel flow is a very common problem.  Do a fuel flow test, even if you have already fitted a big expensive pump, you might be surprised.

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Okay, thank you. Injector Duty cycle was at maximum 89 between 6700 - 6800 rpm. Does this indicate that there were enough fuel flow? I havent done the fuel flow test (yet). Inlet manifold and throttle body are standard whereas head and cams are modified, compression ratio raised and exhaust totally upgraded (including manifold and cat). Poor inlet system probably could be the reason for limited power output and bad response when increasing fuel zones? Or could the reason still be an inadeqate fuel flow, what would you think?

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  • 2 weeks later...

Assuming you were getting the required AFR at 89% then that would suggest just enough fuel flow.  If it was leaning out at that DC% then you may be running out.  Easiest way is to check that fuel pressure does not drop off at full power. 


Remember that increasing the fuel zones is most likely going toreduce power not increase it if the mixture is already rich enough.  If you have an accurate enough dyno and AFR meter then you should be able to see the changes in zone fuel vaules directly in the AFR values.

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