One more time Vibration experiment

[Wildrice]

I took your advice and did a search. After doing lots of reading, I stand by my opinion. There are opinions on both sides of the question, but after evaluating the sources, I still feel free-revving isn't a good practice. I'm not here to hijack your thread, and as it's a moot point since it doesn't matter to either of us what the other does with their own machines. It is somewhat interesting, however, to note that many modern engines (my 2016 Z06, for example) have software to severely limit free-revving.

I agree with you on cetain rpm limits--or to do it every day---for a longer period of time. To do my vibration experiment would take --at 3 sec per rev level would equal 18 seconds or less for the entire experiment with 3 sec or less at 6000..
I get an uneasy feeling standing next to an engine that is continually being rev'd up to a highest rpm---something about the noise---or fear it will blow up in my face--it's an irritating unpleasant intimidating sound--and that sound naturally gives the impression of impending damage. If performing my experiment once or twice damages that engine---the engine was already on its way out before the experiment. I don't know the rpm redline or free reving limit on your Z06 but I'm guess if the redline is 6400 the limit would be in the 4000 rpm + or - range to prevent the sound freaks from high rev everytime there's a crowd to observe & they feel the need to show off. I'm thinking Chevy may have placed this Z06 free-rev limit after a 2015 Z06 blew it's engine with 891 miles on the new car. Somehow some people always find a way to avoid "common Sense" Peace Out---Darrell

 

[PMK]

I do not know if the Spyder has the engine management system change parameters out of gear vs in gear.

There are some motorcycle that have a sensor on the shift drum. In neutral the engine timing and peak rpm may be limited to aid in passing sound tests. Probably also to minimize people grabbing a handful of throttle and causing damage.

 

[Xyzzy]

I do not know if the Spyder has the engine management system change parameters out of gear vs in gear.

The limiter is set at 7,500 RPM in neutral and 8,100 RPM in gear.

 

[PMK]

The limiter is set at 7,500 RPM in neutral and 8,100 RPM in gear.

OK, not sure where that info is found, but sounds viable.

They probably also detune the timing also, if noise standards are measured at a given rpm in neutral.

The end result of this vibration plot will be interesting.

 

[Xyzzy]

OK, not sure where that info is found, but sounds viable.

It is on page 645 in the service manual.

The 7,500 RPM limiter also applies to a disengaged clutch when in gear.