If you are reading this you are well aware of the famous jumper mod that can be done on the 05-08 ZX6R's. If you don't know about it you have been living in a box!
j/k...
Now that I've done more research on it looking at other dyno charts I'm 99.99% sure it's ignition timing advance at 13,000 rpm and up. We already knew it opened the exhaust valve in the upper rpm's. Probably why they had to retard the timing to reduce building up too much backpressure in the exhaust. Here's my proof. Look at these two different dynos comparing the before and after the jumper mod. Notice how the power curves are exactly the same and then you get the continuing slope after 13k and up. The air/fuel ratio is unchanged on the i-hacked dyno proving it's only an ignition advance. In the meantime here are the two different charts and a post from an R6 forum. (proof that they are spying on us kawis!
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The famous i-hacked website dyno w/ 636. Check out the air/fuel before and after. Unchanged. The power curve prior to 13,000 rpm. Unchanged.
A post from an R6 forum...
Just for the records, the ECU mod adds about 7hp and this has been proven on Louie's dyno Lloyd! The story behind the Kawi's is the the US spec 6RR and 6R's timing are retarded an "X" amount of degrees. With the ECU mod, you're just bringing the timing back. The stock 636 dyno'd at 107hp, less than 5 mins later, with the jumper in place, reran it on Louie's dyno and peaked at 114hp.
My buddy's 6RR dyno'd 103hp on pump gas with a full system, PCIII, ignition advancer. He did the ecu jumper mod and threw it back on the dyno and gain 7hp just just from the mod pushing it to 110hp for a 6RR! Not too shabby.
B4 the ecu jumper=103
After the ecu jumper=110
Check out the top portion of the dyno sheet on the first run. Then check out the top end after the jumper mod. Notice how it peaks more instead of flattens out.
The reason why this won't work on a Yamaha or any other bike is because the timing is already advanced. Unless someone can crack open the ECU and find a way then they can prove me wrong.
Again, the same exact slope until 13,000 rpm. If fuel/air was affected, then we wouldn't have the same power curve. Proof that it is only ignition timing advance and not a hidden fuel map in the ECU.
Finally, here's a comparison between SLIDER's dyno map and mine. We basically have almost the same setup.
SLIDER has the jumper mod "activated"
Now here is my dyno without the jumper mod... Hmmm It seems to flatten out a little at top end while SLIDER's slope is steadily rising...
Oh and look... A 6-7 HP difference between the two dyno charts. I wonder why that is...
So jumper mod or not you are still running the stock fuel mapping regardless if you have a PCIII or not. The PCIII manipulates fuel delivery based on what the injector is putting out already.
I already said this but my guess is since they had to install the exhaust valve to limit the noise they also had to retard the timing.
I hope this was helpful and cleared up some confused minds!
