Hello folks, I have 2 quick questions I need some help on. I'm running Microsquirt on a heavily moddified yamaha banshee. I'm running alhpa N tuning and have the rev limiter set to 13000rpm with a 100rpm soft zone. The issue I have is when the rear wheels come off the ground or crest a whoop and lose full traction under heavy/full throttle between 6K and 10K, engine power is immediately cut for a split second. If the tires never break load, I can rip through all 6 gears to 10,000rpm (where power falls off) with no limiting kicking in of any kind. Do you guys have any suggestions of some simple setting I'm missing?
Second question relates to getting the spark plug to fire at exact TDC to check my locating mark. Just double checking things here; If I set the cranking advance to zero and my 1000rpm cells in the ignition table to zero, that should make the plug fire at TDC and then I can adjust the #1 tooth offset to get it to exact zero right?
Thanks for the help folks!
Rev limiter settings and zeroing timing to check TDC mark
Moderators: jsmcortina, muythaibxr
Rev limiter settings and zeroing timing to check TDC mark
Last edited by Whitbread on Sun Jun 21, 2015 9:57 am, edited 1 time in total.
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billr
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Re: Rev limiter settings and zeroing timing to check TDC mar
Easier than that, for checking timing, is to change from "use table" to "fixed timing" and set in a convenient number for the "fixed". If the only crank mark you have is TDC then "0" for fixed will work. Power will be down, but good enough to rev it all the way up and verify timing isn't drifting with rpm.
Re: Rev limiter settings and zeroing timing to check TDC mar
D'oh. Yup, that's simple. I'm 99% sure I have it right, I just wanted to double check as I had to change flywheels and reluctor wheels last week.billr wrote:Easier than that, for checking timing, is to change from "use table" to "fixed timing" and set in a convenient number for the "fixed". If the only crank mark you have is TDC then "0" for fixed will work. Power will be down, but good enough to rev it all the way up and verify timing isn't drifting with rpm.
Re: Rev limiter settings and zeroing timing to check TDC mar
No one happens to know of a setting or conditions that cause power to be suddenly cut when rear wheels lose/break traction under WOT? Is there such a thing as an RPM/dot rate for damage prevention if you break a driveline component? Or is this just a quirk of alpha-N and I need to switch to speed density or ITB?
Last edited by Whitbread on Sun Jun 21, 2015 9:57 am, edited 1 time in total.
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billr
- Super MS/Extra'er
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- Joined: Sun May 15, 2011 11:41 am
- Location: Walnut Creek, Calif. USA
Re: Rev limiter settings and zeroing timing to check TDC mar
Can you post a run log of when this happens? That "1st deriv prediction" for ignition control sure hints that it may be an rpm/dot condition that is triggering the rev limiter.
Re: Rev limiter settings and zeroing timing to check TDC mar
it could have happened because on the rev limiter window you have a limit 6000 rpm when in tps bypass, try change the rev limiter clt based to normal and see if that fixed your issue.
Re: Rev limiter settings and zeroing timing to check TDC mar
I would love to, but trying to carry a laptop on an 80hp atv at WOT when leaving the ground is slightly tricky haha. My only laptop is a 17" screened monster, I really need to get one of the little tiny net books so I can put it in a backpack.billr wrote:Can you post a run log of when this happens? That "1st deriv prediction" for ignition control sure hints that it may be an rpm/dot condition that is triggering the rev limiter.
I'll give it a whirl and report back! I did the CLT rev limiter to prevent dumbasses from hopping on my bike and ripping on a cold motor like I always see everyone do.yzn wrote:it could have happened because on the rev limiter window you have a limit 6000 rpm when in tps bypass, try change the rev limiter clt based to normal and see if that fixed your issue.
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billr
- Super MS/Extra'er
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- Joined: Sun May 15, 2011 11:41 am
- Location: Walnut Creek, Calif. USA
Re: Rev limiter settings and zeroing timing to check TDC mar
Isn't this an MS3 of some sort? Stick an SD card in there for logging...
Re: Rev limiter settings and zeroing timing to check TDC mar
No, Microsquirt running msextra code. The B&G code didn't want to play reliably.billr wrote:Isn't this an MS3 of some sort? Stick an SD card in there for logging...