Rev limiter
May 16, 2008 | 07:33 PM
#1
Thread Starter
Joined: Jun 2005
Posts: 4,520
Likes: 245
From: Suburban Chicago
Rev limiter
I posted this at HP Tuners with no response yet:
Today I played around with timing as a rev limiter. At well below the shift rpm to verify what was happening, I retarded the timing at 6000 to 0°, -5° at the next rpm, and -10° at the next. The engine lost all power at about 5600 and crept (relatively speaking) up to 6000, and would not go any higher. For lack of a better description, it felt very natural, unlike when my chin almost hits the steering wheel using fuel cutoff as a rev limiter. I am from now on going to use this as a soft rev limiter, and set the fuel cutoff above it as an absolute limit.
Why have I not heard this idea before? Because I am too lazy to search? Any possibility of harming anything?
Today I played around with timing as a rev limiter. At well below the shift rpm to verify what was happening, I retarded the timing at 6000 to 0°, -5° at the next rpm, and -10° at the next. The engine lost all power at about 5600 and crept (relatively speaking) up to 6000, and would not go any higher. For lack of a better description, it felt very natural, unlike when my chin almost hits the steering wheel using fuel cutoff as a rev limiter. I am from now on going to use this as a soft rev limiter, and set the fuel cutoff above it as an absolute limit.
Why have I not heard this idea before? Because I am too lazy to search? Any possibility of harming anything?
May 16, 2008 | 08:33 PM
#2
I posted this at HP Tuners with no response yet:
Today I played around with timing as a rev limiter. At well below the shift rpm to verify what was happening, I retarded the timing at 6000 to 0°, -5° at the next rpm, and -10° at the next. The engine lost all power at about 5600 and crept (relatively speaking) up to 6000, and would not go any higher. For lack of a better description, it felt very natural, unlike when my chin almost hits the steering wheel using fuel cutoff as a rev limiter. I am from now on going to use this as a soft rev limiter, and set the fuel cutoff above it as an absolute limit.
Why have I not heard this idea before? Because I am too lazy to search? Any possibility of harming anything?
Today I played around with timing as a rev limiter. At well below the shift rpm to verify what was happening, I retarded the timing at 6000 to 0°, -5° at the next rpm, and -10° at the next. The engine lost all power at about 5600 and crept (relatively speaking) up to 6000, and would not go any higher. For lack of a better description, it felt very natural, unlike when my chin almost hits the steering wheel using fuel cutoff as a rev limiter. I am from now on going to use this as a soft rev limiter, and set the fuel cutoff above it as an absolute limit.
Why have I not heard this idea before? Because I am too lazy to search? Any possibility of harming anything?
May 17, 2008 | 05:49 PM
#5
Ok Mike, maybe I misunderstood you. If you started killing timing at 6k then why did it start dropping off at 5600? Are you starting to pull timing at 5600 and gradually dropping it to nothing at 6k or ???????
As for your question, I cant see how it would hurt anything. Basically there are two types of rev limiters. Fuel and timing.
As for your question, I cant see how it would hurt anything. Basically there are two types of rev limiters. Fuel and timing.
May 18, 2008 | 12:40 AM
#6
Thread Starter
Joined: Jun 2005
Posts: 4,520
Likes: 245
From: Suburban Chicago
Thanks, Klive. Since it's such a bad idea, I'll take it out. Too bad I have to get rid of it, because it works so well.
To go from 21 degrees to zero, the program connects the two points on the graph (5600 and 6000) with a downward slanting line. Because there are no setpoints between the two, this is the steepest that the line can go down. So to be 0 at 6000, it has to start decreasing timing at 5600. It seems that it should be able to go to 6000 at 21 degrees, and have the graph's line drop to zero straight down the 6000 line, but that could only take place if you could program both timing numbers into one cell.
To go from 21 degrees to zero, the program connects the two points on the graph (5600 and 6000) with a downward slanting line. Because there are no setpoints between the two, this is the steepest that the line can go down. So to be 0 at 6000, it has to start decreasing timing at 5600. It seems that it should be able to go to 6000 at 21 degrees, and have the graph's line drop to zero straight down the 6000 line, but that could only take place if you could program both timing numbers into one cell.
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