THUNDERMAX: Pathetic Fuel Economy - T-Max Experts HELP!
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Elite HDF Member
Joined: Aug 2008
Posts: 4,133
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From: Japan
I have just two more questions for you, Max, then I'll leave you alone (if that doesn't lead to more questions - LOL):
1. Why did you advance the timing so much on your 103 in the the lower RPMs (under 2000)?
2. Why did you retard it more in the higher RPMs (over 3500)?
1. Why did you advance the timing so much on your 103 in the the lower RPMs (under 2000)?
2. Why did you retard it more in the higher RPMs (over 3500)?
Seasoned HDF Member
Joined: Dec 2005
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From: poway
I have just two more questions for you, Max, then I'll leave you alone (if that doesn't lead to more questions - LOL):
1. Why did you advance the timing so much on your 103 in the the lower RPMs (under 2000)?
2. Why did you retard it more in the higher RPMs (over 3500)?
1. Why did you advance the timing so much on your 103 in the the lower RPMs (under 2000)?
2. Why did you retard it more in the higher RPMs (over 3500)?
Advancing the timing at partial throttle at lower RPMs helps a little with throttle response and exhaust popping. It also helps burn all the fuel that is available which helps with closed loop AFRs. One thing to remember is that cylinder pressure is low at partial throttle.. Low cylinder pressure takes longer for the fuel to burn.
In the upper RPM ranges partial throttle is pretty much the same as lower rpm but at wide open throttle it has to be less. The cylinder pressures are much higher. Fuel burns faster.. I've used a dyno on occasion and simply tune WOT timing to where it makes the most power.
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Elite HDF Member
Joined: Aug 2008
Posts: 4,133
Likes: 125
From: Japan
Not sure what you are asking. Is this simply in reference to other maps?
Advancing the timing at partial throttle at lower RPMs helps a little with throttle response and exhaust popping. It also helps burn all the fuel that is available which helps with closed loop AFRs. One thing to remember is that cylinder pressure is low at partial throttle.. Low cylinder pressure takes longer for the fuel to burn.
In the upper RPM ranges partial throttle is pretty much the same as lower rpm but at wide open throttle it has to be less. The cylinder pressures are much higher. Fuel burns faster.. I've used a dyno on occasion and simply tune WOT timing to where it makes the most power.
Advancing the timing at partial throttle at lower RPMs helps a little with throttle response and exhaust popping. It also helps burn all the fuel that is available which helps with closed loop AFRs. One thing to remember is that cylinder pressure is low at partial throttle.. Low cylinder pressure takes longer for the fuel to burn.
In the upper RPM ranges partial throttle is pretty much the same as lower rpm but at wide open throttle it has to be less. The cylinder pressures are much higher. Fuel burns faster.. I've used a dyno on occasion and simply tune WOT timing to where it makes the most power.
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