New type Engine Rev Limiter
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New type Engine Rev Limiter
What is the new type of rev limiter that I am starting to hear? It is real loud and does not seem to break up much. I have heard it several times on those small tire no prep races.
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Re: New type Engine Rev Limiter
Not sure what you are talking about.. some are throttle stop. So all cylinders are still firing.. some are your basic 2 step, spark cut.
Re: New type Engine Rev Limiter
Probably a type of traction control, timing retard through the ecu.
You can hear it, but depending on the tune how aggressive it works and sounds.
Maybe
You can hear it, but depending on the tune how aggressive it works and sounds.
Maybe
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Re: New type Engine Rev Limiter
You may be referring to a lower rpm 2 or 3 step limiter to spool the turbo?econo racer wrote: ↑Tue Aug 09, 2022 5:13 pm What is the new type of rev limiter that I am starting to hear? It is real loud and does not seem to break up much. I have heard it several times on those small tire no prep races.
Re: New type Engine Rev Limiter
Pumped up exhaust valve lifters ?econo racer wrote: ↑Tue Aug 09, 2022 5:13 pm What is the new type of rev limiter that I am starting to hear? It is real loud and does not seem to break up much. I have heard it several times on those small tire no prep races.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
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Re: New type Engine Rev Limiter
Do you folks know how bad the added loading of a crank is when a rev limiter system is employed that drops out cylinders!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: New type Engine Rev Limiter
Retarding ignition would work and sound loud in normally aspirated engines. Although many for bangers seem to cut off the fuel to the outside cylinders as the soft revlimiter.
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: New type Engine Rev Limiter
In a turbo application there has been a trend of retarding timing to build more exhaust heat thus spooling turbo quicker.
Re: New type Engine Rev Limiter
That makes sense, but I think the way those calibrations work is by pulling timing temporarily after the gas pedal has been floored.
In turbo car and by my thinking, regarding timing alone is not the best way to create a soft revlimiter. It may spin up the turbine even more, trigger a boost spike, and preignition. I think that in a turbo car, either fuel or air has to be cut off (closing the throttle and/or opening the wastegate) to limit the revs.
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: New type Engine Rev Limiter
It was so bad on the Indy IRL engines, it caused valve float/bounce. They had to add a soft limiter to keep the engine from hitting the mandated hard limiter.
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Re: New type Engine Rev Limiter
Might just be a soft limiter with timing retard and the rpm on off times set close together?
Thats how i do my turbo car. Holley efi soft limiter. The timing table around the limiter rpm starts dropping as boost starts building, further lighting up the turbo. Want full timing to get on converter to get to the limiter and dont wanna pull too much timing too quickly so engine doesnt fall off the limiter. I go from 34-36 deg down to 15-16 deg as i get up to 8 psi
Thats how i do my turbo car. Holley efi soft limiter. The timing table around the limiter rpm starts dropping as boost starts building, further lighting up the turbo. Want full timing to get on converter to get to the limiter and dont wanna pull too much timing too quickly so engine doesnt fall off the limiter. I go from 34-36 deg down to 15-16 deg as i get up to 8 psi