Question for those with tuning experience. VE tables
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Road Warrior
Joined: Jul 2014
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From: VA
Question for those with tuning experience. VE tables
Bike was a Stage1 114ci Heritage. Got Stage1 Power Vision map from Fuel Moto. Bike ran great. Added Woods 22X cam and got a map made for the cam from Fuel Moto. Bike runs fine. Today just out of curiosity I compared the Stage1 and Stage2 maps with WinPV. I was surprised to see the VE tables numbers for the Stage2 map were lower in the lower rpm range than the Stage1 map. I expected the cam would require more fuel in the lower rpm range and thus the VE tables numbers would be higher. Can someone explain this? Thanks
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Bike was a Stage1 114ci Heritage. Got Stage1 Power Vision map from Fuel Moto. Bike ran great. Added Woods 22X cam and got a map made for the cam from Fuel Moto. Bike runs fine. Today just out of curiosity I compared the Stage1 and Stage2 maps with WinPV. I was surprised to see the VE tables numbers for the Stage2 map were lower in the lower rpm range than the Stage1 map. I expected the cam would require more fuel in the lower rpm range and thus the VE tables numbers would be higher. Can someone explain this? Thanks
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Road Warrior
Joined: Jul 2014
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From: VA
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the reason I asked when you flashed is I do believe I read that it takes some miles for the fuel tables to adjust completely.
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Road Warrior
Joined: Jul 2014
Posts: 1,584
Likes: 520
From: VA
You are correct. I got some good info from another site. A guy was kind enough to compare his Stage1 and Stage2 maps and his VE tables were similar to mine. The VE tables in the Stage2 map were lower than the Stage1 map at low rpms but higher above 2000 rpms. So sounds like that's typical with a mild cam. I was just surprised it was that way.
Stellar HDF Member
Joined: Mar 2017
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You are correct. I got some good info from another site. A guy was kind enough to compare his Stage1 and Stage2 maps and his VE tables were similar to mine. The VE tables in the Stage2 map were lower than the Stage1 map at low rpms but higher above 2000 rpms. So sounds like that's typical with a mild cam. I was just surprised it was that way.
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HDF Community Team
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Volumetric Efficiency (VE) tables indicate how efficiently your engine pumps air. A value of 100% indicates you are pumping air at full capacity based on engine rpm and displacement. It is possible to go above 100% under certain conditions where intake flow momentum and exhaust scavenging add to flow capacity. A cam that is operating off design (higher rpm cam at lower rpm) will pump less air.
Fuel flow is determine by the Lambda tables (Air Fuel Ratio AFR tables in the old days). At Lambda = 1 the oxygen and fuel are in balance for complete combustion. At high power and high rpm Lambda is reduced (more fuel is added than can be burned completely) this done to reduce combustion temperatures to a level the engine can tolerate.
Fuel flow is determine by the Lambda tables (Air Fuel Ratio AFR tables in the old days). At Lambda = 1 the oxygen and fuel are in balance for complete combustion. At high power and high rpm Lambda is reduced (more fuel is added than can be burned completely) this done to reduce combustion temperatures to a level the engine can tolerate.
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Road Warrior
Joined: Jul 2014
Posts: 1,584
Likes: 520
From: VA
Volumetric Efficiency (VE) tables indicate how efficiently your engine pumps air. A value of 100% indicates you are pumping air at full capacity based on engine rpm and displacement. It is possible to go above 100% under certain conditions where intake flow momentum and exhaust scavenging add to flow capacity. A cam that is operating off design (higher rpm cam at lower rpm) will pump less air.
Fuel flow is determine by the Lambda tables (Air Fuel Ratio AFR tables in the old days). At Lambda = 1 the oxygen and fuel are in balance for complete combustion. At high power and high rpm Lambda is reduced (more fuel is added than can be burned completely) this done to reduce combustion temperatures to a level the engine can tolerate.
Fuel flow is determine by the Lambda tables (Air Fuel Ratio AFR tables in the old days). At Lambda = 1 the oxygen and fuel are in balance for complete combustion. At high power and high rpm Lambda is reduced (more fuel is added than can be burned completely) this done to reduce combustion temperatures to a level the engine can tolerate.
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