MAP load question
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Cruiser
Joined: Sep 2007
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From: Dallas / Ft. Worth, Texas
MAP load question
Under what conditions would you typically get MAPs over 80? If a 2007 FLHT were in 6th gear at 2500 RPM at sea level on a level Interstate Highway with no head wind, what would you expect the MAP to be? (Sorry for the basic question, but I've been riding for over 25 years, and this is my first bike with EFI.) Thanks. Dennis
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Joined: Jul 2005
Posts: 916
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From: Mauldin, SC
RE: MAP load question
Dennis, I just looked through a data run I did a couple weeks ago and 80 kPa seems to happenas soon as 22% throttle at 2000 rpm.
It seems to depend on boththrottle position and rpm. The higher the rpm, the more throttle is needed to achieve the same MAP.
Some random data I got from my data file:
2000 rpm, 81 kPa, 22% throttle
2300 rpm, 81 kPa, 26% throttle
3000 rpm, 79 kPa, 29% throttle
3750 rpm, 81 kPa, 36% throttle
4500 rpm, 79 kPa, 38% throttle
Based ondata from my Dyna, it looks like at steady 2500 rpm,MAP would be around 36-38 kPa.
Thetable below is from the Race Tuner manual as a rough indication of MAP vs throttle position. Obviously, MAP at 25% throttle going up a steep hill 2 up is going to be higher than it will be at 25% throttle going downhill solo.
[align=left]This table provides a rough guide to matching throttle position to engine load. Note that a broad range is listed in some throttle positions. This is due to the amount of load on the bike at that time. More Load = More MAP. To identify the exact MAP the symptom is present in, the user will need to record the performance test using the EFI Tuner Data Mode. [/align]
[align=left]Throttle Position vs MAP- (Manifold Absolute Pressure) [/align]
[align=left]0-6% [/align][align=left]10-50 kPa [/align]
[align=left]12% [/align][align=left]40-55 kPa [/align]
[align=left]25% [/align][align=left]55-90 kPa [/align]
[align=left]50% [/align][align=left]90-100 kPa [/align]
[align=left]50-100% [/align][align=left]90 and higher kPa [/align]
It seems to depend on boththrottle position and rpm. The higher the rpm, the more throttle is needed to achieve the same MAP.
Some random data I got from my data file:
2000 rpm, 81 kPa, 22% throttle
2300 rpm, 81 kPa, 26% throttle
3000 rpm, 79 kPa, 29% throttle
3750 rpm, 81 kPa, 36% throttle
4500 rpm, 79 kPa, 38% throttle
Based ondata from my Dyna, it looks like at steady 2500 rpm,MAP would be around 36-38 kPa.
Thetable below is from the Race Tuner manual as a rough indication of MAP vs throttle position. Obviously, MAP at 25% throttle going up a steep hill 2 up is going to be higher than it will be at 25% throttle going downhill solo.
[align=left]This table provides a rough guide to matching throttle position to engine load. Note that a broad range is listed in some throttle positions. This is due to the amount of load on the bike at that time. More Load = More MAP. To identify the exact MAP the symptom is present in, the user will need to record the performance test using the EFI Tuner Data Mode. [/align]
[align=left]Throttle Position vs MAP- (Manifold Absolute Pressure) [/align]
[align=left]0-6% [/align][align=left]10-50 kPa [/align]
[align=left]12% [/align][align=left]40-55 kPa [/align]
[align=left]25% [/align][align=left]55-90 kPa [/align]
[align=left]50% [/align][align=left]90-100 kPa [/align]
[align=left]50-100% [/align][align=left]90 and higher kPa [/align]
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