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Thread: Gen 5: 2016 -> fuel cut Reply to Thread
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  Topic Review (Newest First)
05-01-2017 10:41 PM
cosmic_ocean
Quote:
Originally Posted by Maniac_ZX10R View Post
Do our gen 5s cut fuel when quickshifting? Or do they only cut the ignition? Does anybody know?
Ignition cut to my knowledge. The fuel continues to be supplied.
01-25-2017 09:26 PM
Vonstallin
Quote:
Originally Posted by chiffeee View Post
I run slicks 200/60 rear , 2070 mm rear 1905 mm front , should be same as street same size
Quote:
Originally Posted by cwrzx View Post
SP V2 front is 1898mm and rear is 2048mm for 190/55 but I think you actually need rolling circumference. So far the only company that list some rolling circumference is Metzeler.
Hey thanks fellas...


I have the SP V2 on the street bike 200/55 so I put it at 2050 for the rear.
01-06-2017 12:00 PM
Maniac_ZX10R Yes your right. Interesting to think about all these things.
01-06-2017 09:09 AM
SpazOnaZX
Quote:
Originally Posted by Maniac_ZX10R View Post
I been just asking cause in chiffees Graphs you can see lean spikes while shifting. First I was thinking this must be fuel cut while shifting. Else it would be rich spikes. But I think i tought wrong. When you cut the ignition you'll have alot of O2 in the exhaust gas, cause there was no spark to burn it. A Lambda sond just measuring this O2 woul not know that there is also unburnt fuel.

So its monitoring lean A/F. Do you think im right?
Quote:
Originally Posted by realpsi View Post
Yes, for the single event
Correct; engine misfires will show up as lean spikes on an AFR/Lambda readout. Funny enough, you can cause an engine to misfire from too much fuel and have it show as a lean spike.... plays hell with figuring out TPS-delta enrichment from scratch.
01-06-2017 08:45 AM
SkyDork
Quote:
Originally Posted by bbsteinnewyork View Post
Really??? You do not understand why...and I get it. Only a tuner with decades of experience at the highest levels of race will. Enough said

Sent from my SM-G930V using Tapatalk
OK, thanks for the informative post.
01-06-2017 08:26 AM
mpp12 I saw a F1 documentary and engine test, to my amazement the test was done simulating racing and the cut was fuel (you could see the inyectors cut), of course I could not see if ignition was cut also...

I use both on my gen4 producing a very smooth shifting.
01-06-2017 07:53 AM
bbsteinnewyork
Quote:
Originally Posted by SkyDork View Post
From an engineering perspective, that would be stupid to combine the different methods and would over complicate everything. The simplest way to accomplish the goal is usually the best way to go.

Bazzaz uses ignition kill. Power Commanders uses fuel cut. Both work equally well using one method and both have specific advantages. Why would Kawi go and combine fuel cut with ignition kill? Or go even further with it. With ride-by-wire they could accomplish the same thing by monkeying with the ETV mapping for the QS function and leave the fuel and ignition maps alone. But what advantage does combining methods serve? It doesn't. We're talking about momentarily killing power to the motor to unload the tranny. Milliseconds of interruption to get this to happen.

I'd suspect that Kawi uses ignition cut for the QS function, but I'm not sure. It's the simplest, most direct method to get the function to happen.
Really??? You do not understand why...and I get it. Only a tuner with decades of experience at the highest levels of race will. Enough said

Sent from my SM-G930V using Tapatalk
01-06-2017 07:49 AM
bbsteinnewyork 5
01-06-2017 04:43 AM
realpsi
Quote:
Originally Posted by Maniac_ZX10R View Post
I been just asking cause in chiffees Graphs you can see lean spikes while shifting. First I was thinking this must be fuel cut while shifting. Else it would be rich spikes. But I think i tought wrong. When you cut the ignition you'll have alot of O2 in the exhaust gas, cause there was no spark to burn it. A Lambda sond just measuring this O2 woul not know that there is also unburnt fuel.

So its monitoring lean A/F. Do you think im right?
Yes, for the single event
01-06-2017 03:31 AM
Maniac_ZX10R I been just asking cause in chiffees Graphs you can see lean spikes while shifting. First I was thinking this must be fuel cut while shifting. Else it would be rich spikes. But I think i tought wrong. When you cut the ignition you'll have alot of O2 in the exhaust gas, cause there was no spark to burn it. A Lambda sond just measuring this O2 woul not know that there is also unburnt fuel.

So its monitoring lean A/F. Do you think im right?
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