Dynamo^Joe
Newbie
- Joined
- Jan 4, 2005
- Messages
- 15
- Reaction score
- 0
- Points
- 451
- Location
- Thunder Bay, Ontario
- Website
- www.mxzx-revzone.com
I don't know of another way to educate a novice tuner to be able to talk to an experienced tuner. My goal is for a novice tuner to be able to pick up this clutch book and read it, he/she would have a good idea of what other experienced tuners talk about.
My thinking, the definitions are not supposed to be arbitrary based on someone's way of thinking. The definitions should be built on a set of rules based on facts of the subject. Trying to keep a word from tuners having different definitions of it. Like the word "overshift" is attached to a context of a subject.
In this context (facts that surround an rpm event), relating to this subject matter (accelerating at w.o.t.), what is the true meaning of the word Overshift?
Quotes Aaen: The sole purpose of clutch tuning is to have the system matched in such a way that the engine is held at it's power peak all the way from low ratio to high ratio.
Quotes BRP pulley development: The goal of clutch calibration is to keep the engine, at full throttle, at it's peak power RPM and at the same time to select the highest possible gear ratio dictated by the load on the drive axle. The speed diagram illustrates what the goal of good clutch calibration is.
From tuners views, describing the events they've seen and solutions to a problem like this from experiences....I would say overshift is tied to under rev. Under shift is tied over rev.
If the ratio change "duration" is too small, like the secondary won't upshift,(too low of helix angle/too high of secondary spring forces) then engine speed flares into over rev.
If the ratio change "duration" is too large, like the secondary upshifts too easily, (too large of helix angle/too low of secondary spring forces) then the engine speed lowers into under rev.
Could all the information be overlapped and connected to say that...
Over shift: While accelerating at wide open throttle;
a. (clutch up shift) shifting the clutches out faster than the motor can handle, revealing low rpms.
b. (engine speed) A variation of low rpm caused by a surge of increased secondary load against the primary load.
c. (time) reveals accumulated time not accelerating at rated rpms.
Because of Aaen's reference point of having a straight rpm from low ratio to high ratio, then it could be thought as over shift is a separate detail from under shift.
Would a. b. c. be suitable for the definition of Overshift?
My thinking, the definitions are not supposed to be arbitrary based on someone's way of thinking. The definitions should be built on a set of rules based on facts of the subject. Trying to keep a word from tuners having different definitions of it. Like the word "overshift" is attached to a context of a subject.
In this context (facts that surround an rpm event), relating to this subject matter (accelerating at w.o.t.), what is the true meaning of the word Overshift?
Quotes Aaen: The sole purpose of clutch tuning is to have the system matched in such a way that the engine is held at it's power peak all the way from low ratio to high ratio.
Quotes BRP pulley development: The goal of clutch calibration is to keep the engine, at full throttle, at it's peak power RPM and at the same time to select the highest possible gear ratio dictated by the load on the drive axle. The speed diagram illustrates what the goal of good clutch calibration is.
From tuners views, describing the events they've seen and solutions to a problem like this from experiences....I would say overshift is tied to under rev. Under shift is tied over rev.
If the ratio change "duration" is too small, like the secondary won't upshift,(too low of helix angle/too high of secondary spring forces) then engine speed flares into over rev.
If the ratio change "duration" is too large, like the secondary upshifts too easily, (too large of helix angle/too low of secondary spring forces) then the engine speed lowers into under rev.
Could all the information be overlapped and connected to say that...
Over shift: While accelerating at wide open throttle;
a. (clutch up shift) shifting the clutches out faster than the motor can handle, revealing low rpms.
b. (engine speed) A variation of low rpm caused by a surge of increased secondary load against the primary load.
c. (time) reveals accumulated time not accelerating at rated rpms.
Because of Aaen's reference point of having a straight rpm from low ratio to high ratio, then it could be thought as over shift is a separate detail from under shift.
Would a. b. c. be suitable for the definition of Overshift?
