Shifting

Greg H · **Joined:** Tue Dec 22, 2009 11:04 pm **Posts:** 36

Hi Guys . Well I've just finished reading all the posts on Shifting and now my head hurts

. My launch technique is quit simple , give it loads of revs, hold on a fixed throttle hold the clutch at the bite point and when the first orange comes on clutch out and full throttle and hang on, simples . I have the Mini Max set at 60% and 2secs and if I get it right the nitrous should just be nibbling at the top of first gear and full on in 2nd . My shift light packed in recently so at the moment I'm shifting by instinct and occasionaly glancing at the tacho , so far every thing is going fine and nobody with similar set up is going any quicker in fact most are slower so the shift light can wait .To be honest the only thing that seems to affect the ETs is how agressive I get on the clutch , quicker 60ft = quicker ET .

suzook12 · **Posted:** Sun Aug 15, 2010 10:48 pm

Greg H wrote:

Hi Guys . Well I've just finished reading all the posts on Shifting and now my head hurts

. My launch technique is quit simple , give it loads of revs, hold on a fixed throttle hold the clutch at the bite point and when the first orange comes on clutch out and full throttle and hang on, simples . I have the Mini Max set at 60% and 2secs and if I get it right the nitrous should just be nibbling at the top of first gear and full on in 2nd . My shift light packed in recently so at the moment I'm shifting by instinct and occasionaly glancing at the tacho , so far every thing is going fine and nobody with similar set up is going any quicker in fact most are slower so the shift light can wait .To be honest the only thing that seems to affect the ETs is how agressive I get on the clutch , quicker 60ft = quicker ET .

Well, theres ya answer, everyone running the same or similar set-up. The idea behind the launch technique is to give you a quicker 60ft with less likelyhood of wheelying. I for one will certainly be giving it a try when i get some track test time. If it gives me an extra 2 tenths then its 2 tenths i havent got to find further down the track where its not so easy to find..... As we all know, its all in the 60ft

Steve

yamhamr · **Joined:** Thu Aug 25, 2011 2:38 am **Posts:** 33

Sorry for re- awaking an older post, but I'm new to nitrous and working toward effeciency and better 60 ft. time. This seems to be right up my alley as my bike (a big yamaha v-twin) make lots of torque at low rpm and remains high to just before the 5500 rev limit.

Noswizard wrote:

I'm currently trying to re-educate my American bike customers on this subject.

They have had to 'adjust' their method of using nitrous to allow for the CRUDE & BRUTAL way that US kits deliver the power and as a consequence they CAN'T use it at low rpm and they've found that using it at high rpm allows them to use more, because less is being used per cycle.

However, to take full advantage of what nitrous offers and how it works (when you have a WON system ONLY), it is better to launch at as low a rpm as possible (1,000 if you can manage it) and INSTANTLY add as much nitrous as you can manage, then use as few gears as possible (even if that means skipping 2nd & 4th or even launching in 2nd and skipping 1st, 3rd & 5th) but failing that shift earlier than NA and only track results will show where optimum is for your vehicles.

BTW EVERYONE who has followed that advice has run QUICKER. :idea:

I've been launching @ 2500 to 3000 rpm and not adding nos till second gear from fear of wheel spin, wheely(no bar) or detonation. Now the above approach seems obvious. I guess my question would be should I start with a little extra ignition retard and say 25% nos initially in first gear, till I dial it in.
Thanks, Jim

Noswizard · **Posted:** Sat Aug 27, 2011 10:33 am

In general you shouldn't need ANY retard at such low power settings.

Please provide the following details so I can be more specific;
Compression ratio
Existing timing
Plug grade
Fuel type
A picture of the installation of the nitrous system
Type of progressive
Pumped or gravity fed fuel

yamhamr · **Joined:** Thu Aug 25, 2011 2:38 am **Posts:** 33

Noswizard wrote:

In general you shouldn't need ANY retard at such low power settings.
Trying to error on the side of caution, I used 2 deg. retard with a 50 hp shot with good results but did not spray off the line in first gear. I have the PC Ignition Module so I can program the ignition retard/advance anywhere throughout the rpm in 500rpm steps. I am currently jetted for 75hp.

Please provide the following details so I can be more specific;
Compression ratio

R Big Bore(110") steel liners with 10.25/1 cr forge pistons
Existing timing : Adjustible + - 10 deg. currently -2deg. from stock.
Plug grade : one step colder than stock, trimmed back electrode as per your book.
Fuel type : Sunoco Race Fuel CA Phase 3 unleaded 100 R+M/2 Octane
A picture of the installation of the nitrous system : I have the Street Blaster 50 w/twin fuel jets and a an adjustible fuel pressure regulator (nice)

http://i296.photobucket.com/albums/mm177/yamhamr/nitrouswarrior001.jpg[/img]
Type of progressive : Maxextreme Race
Pumped or gravity fed fuel :Fuel Injected 50 psi upgraded to 255 lph pump.

Thanks

yamhamr · **Joined:** Thu Aug 25, 2011 2:38 am **Posts:** 33

I'm a little disfuctional on a computer lets see if I can attach the second picture I attempted on my earlier reply sorry for the quality. Not shown in the pictures, I have fuel and nos pressure xducers.

Thanks, Jim

Noswizard · **Posted:** Sat Aug 27, 2011 4:51 pm

If you PRIME the system before the run (give it a short burst during a burnout), you should be fine to activate the system as described for optimum launches.

yamhamr · **Joined:** Thu Aug 25, 2011 2:38 am **Posts:** 33

Thanks, can't wait to try it out. Have a test & tune day Sept 10, friend of mine runs the Vmax forum here, rented the local strip for the day so I'll be playin with a bunch of Vmaxes, should be fun. I'll let you know how it turned out.

Noswizard · **Posted:** Sun Aug 28, 2011 11:18 am

I'll be looking forward to hearing how you do.

There's just one thing to keep in mind, you don't want to bog/overload the engine too much and add too much nitrous at the same time. What you need is a balance between pulling the revs down and adding enough nitrous to instantly make the bike accelerate.
Too big a bog/drop in rpm and too much nitrous is to be avoided at all costs.

Get the balance just right and you'll be AMAZED at the results.

Start with a 20% start power settings rising to a modest power level in the launch gear over the estimated time in that gear and once you have that working well you can start cranking up the settings.

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