When to shift?

[fadiizzaldin]

Lets say nos is on at 7000 RPM off at 10200 . RPM limiter is at 11200 RPM ... when to shift?

Thanks to all

 

[Johnnycheese]

10200

 

[Draco1340]

Why are you turning the juice off at 10.2k? The motor will pull all the way to 11k on spray? BTW, I am speaking true RPM, not tack RPM. The way you have it set up, I would think you would get a vicious lean spike if you accidentally went past 10.2k. Assuming this is a dry shot using ECU editor, your fuel injector will respond instantly, but the N2O jet(s) can take a relatively long time to bleed down. To safely avoid this you might shift at 10k, but then whats the point.

 

[fadiizzaldin]

Why are you turning the juice off at 10.2k? The motor will pull all the way to 11k on spray? BTW, I am speaking true RPM, not tack RPM. The way you have it set up, I would think you would get a vicious lean spike if you accidentally went past 10.2k. Assuming this is a dry shot using ECU editor, your fuel injector will respond instantly, but the N2O jet(s) can take a relatively long time to bleed down. To safely avoid this you might shift at 10k, but then whats the point.

This is my first time i'm going to be using NOS and i'm still trying to learn... its a wet a shot of 30 hp (i know its not much but its a start) and i'm trying to see how to set up my shifting... i have the ECU editor and a quick shifter (also from greg) ... so is it safe for the engine to run nos (to 11000 true RPM) and shift while the bike is still in nos?
Thanks

 

[Draco1340]

... so is it safe for the engine to run nos (to 11000 true RPM) and shift while the bike is still in nos?
Thanks

Set your limiter 300 RPM above the shift point. Don't bother trying to shut off the spray between shifts. It can take a very long time to stop the flow of nitrous, and the shifting is only taking 100 milliseconds. The Gen II motor with stock valves can be safely shifted at 11.2 or 11.3k all day, but set your shift point at 11.0 and your kill at 11.3 and go at it.

 

[fadiizzaldin]

Set your limiter 300 RPM above the shift point. Don't bother trying to shut off the spray between shifts. It can take a very long time to stop the flow of nitrous, and the shifting is only taking 100 milliseconds. The Gen II motor with stock valves can be safely shifted at 11.2 or 11.3k all day, but set your shift point at 11.0 and your kill at 11.3 and go at it.

Thanks .... that make my life easy ...

Thanks again

 

[Speezak]

nitrous should shutoff as close as possible and right before rev limiter kicks in

.

 

[ogre]

if you have a quickshifter setup, and it cuts ignition while the nitrous is kicking, are you gonna blow your mufflers off when it cuts back on after the shift?

 

[Draco1340]

if you have a quickshifter setup, and it cuts ignition while the nitrous is kicking, are you gonna blow your mufflers off when it cuts back on after the shift?

Small shots pop between shifts. Big shots Bang. Nothing you can do about it. The shifter turns off the ignition for ~100 milliseconds. It can take a full second to empty the airbox of gas, so the thought that you can turn off the gas between shifts is a joke. It doesn't work. Carbon canisters will rupture eventually. Even Stainless or Ti canisters will if there is excessive back pressure. I run without a baffle, and am told there is quite the bang out the back.

 

[ogre]

Any other damage then?

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[Draco1340]

No other damage. Just a loud bang. Damage only occurs if the airbox lights off from a backfire on the intake side. A pop on the exhaust side of things is fine.

 

[dadofthree]

Good advice.

 

[fadiizzaldin]

i'm using the ECU editor to do my quick shifts @70ms and i got the sensor from Greg (Boost by Smith) i'm cutting both ignition and fuel ... no backfires what so ever! not even a hint of it .... very very smooth

 

[Karnak]

Small shots pop between shifts. Big shots Bang. Nothing you can do about it. The shifter turns off the ignition for ~100 milliseconds. It can take a full second to empty the airbox of gas, so the thought that you can turn off the gas between shifts is a joke. It doesn't work. Carbon canisters will rupture eventually. Even Stainless or Ti canisters will if there is excessive back pressure. I run without a baffle, and am told there is quite the bang out the back.

+1-I ran wet with an electric shift on an old Kawi and it scared the heck out of people when I'd jump them by a few bike lengths before shifting. They would see a blast and said it sounded like a shotgun. Consider a lot of this was done after dark, so you can imagine the effect!

 

[Draco1340]

i'm using the ECU editor to do my quick shifts @70ms and i got the sensor from Greg (Boost by Smith) i'm cutting both ignition and fuel ... no backfires what so ever! not even a hint of it .... very very smooth

One thing to remember. As you increase the shot size, you may find you need to increase the shift time. The higher the load on the transmission, the longer it takes to shift the dogs in the tranny. I once had a ZX12 with a 100 shot that required that I increase the shift time to about 150 ms. That added 4/10 of a second to the time I was accelerating. I was going like hell, but it took forever to unload the gears. I dropped it to a more manageable 60 shot and went faster with a 100 ms shift time. The busa tranny is a much better tranny.

 

[fadiizzaldin]

One thing to remember. As you increase the shot size, you may find you need to increase the shift time. The higher the load on the transmission, the longer it takes to shift the dogs in the tranny. I once had a ZX12 with a 100 shot that required that I increase the shift time to about 150 ms. That added 4/10 of a second to the time I was accelerating. I was going like hell, but it took forever to unload the gears. I dropped it to a more manageable 60 shot and went faster with a 100 ms shift time. The busa tranny is a much better tranny.

Sure i will! I havent reached a 100 and i hope one day i will so far im on 30 and its a bit frustrating cause i want to increase but parts/ mechanics are very hard to find here and i know i need to mod my engine to make it handle 75 or 100 shot ... but i gotta say.... I LOVE NOS

 

[Busashot]

no backfires from mine with 50-65hp shots. ECU editor and Cycletek air shifter.

I myself cut the nitrous off about 300rpms before shift. ETs and MPH do not show any change if I run the nitrous well into the shift.

 

[ogre]

So cut fuel and spark, ok, I'll remember that

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[YSI408]

New 65lb valve springs put ss valve in it, a set of crower rods. Then spray the house down..

Sure i will! I havent reached a 100 and i hope one day i will so far im on 30 and its a bit frustrating cause i want to increase but parts/ mechanics are very hard to find here and i know i need to mod my engine to make it handle 75 or 100 shot ... but i gotta say.... I LOVE NOS