Cam Swap Pointy?

Originally Posted by SV650Racer

^ I would disagree on one part that riding the bike aswell as using a dyno is the best way to tell if an improvement has been made as a dyno will show fueling and power, torque and gains but riding also backs up what the dyno is telling you.

You can also have dyno not backing up riding.
Tune pointy so your mixture is perfect. Now take throttles off and put set of flatslides on bike. You will have more power, better throttle response and faster bike. Put it on dyno and your mixture will not look as good as first one.
Just because dyno shows flat mixture across rpm's does not mean your bike will run perfect on track. It is common to end up with on/of switch for throttle.
This graph here shows pretty good map but bike is terrible to ride. It is nice and smooth once you are on throttle but when you go in to corner, downshift couple gear, closed throttle to the apex and than when you get back on there is hesitation. Bike bugs and than you open little more throttle and all sudden you get power kick.


Or this one, why is power curve perfect and mixture bad?

Carbs and FI react very differently hence why we also ride aswell as dyno specifically on bikes with carbs, especially flatslides, you know that anyway.

FI is the future LOL

First graph is FI.

Originally Posted by zadar

First graph is FI.

Thats a full throttle run?. Whats it show on loaded part throttle runs?.

Originally Posted by SV650Racer

Thats a full throttle run?. Whats it show on loaded part throttle runs?.

I don't know, did not tune bike. I rode it and it was bad so I called guys that tuned bike and they sent me dyno print out.
The point is that print out looks good but bike runs bad. I found problems riding bike which are not present when bike is on dyno.
In this case bike will go back to mapping and than tried again, repeat until bike is ridable. Dyno will be used as tool to see change and what end result will be which does not have to be dyno's ideal line.
If dyno is ultimate test what would be point of having 2 or 3 different maps on bike that you can switch between?

[yorkie_chris]

Dyno could be an ultimate test, you could do transitions and roll-ons etc but it would be a bit of a bugger to program for. Easier to just print one sheet of paper eh :P

Look at the fueling on a loaded part throttle run. that will show exactly what's happening. the print outs only really show bhp / torque or what people want to see but aren't indicative to how the bikes ridden. part throttle runs show a truer picture and are more relative to real riding. bet the fueling way off on them.

It is not part throttle that is problem, it is closed throttle

Originally Posted by yorkie_chris

Dyno could be an ultimate test,

Maybe but if you tune it today on dyno and next day ride in rain your ultimate dyno map (if such thing exists) may not be hot ticket
Ultimate test is lap time, at least in racing

I think you may be misunderstanding a Dyno Tune, with just a Dyno Run...

A Dyno Run does not change anything to the bike... It Just shows where the bike is at... Part of a Dyno Tune is making a Dyno Run to see the differences from and to... For a Dyno Tune, the Engine Builder / Tuner checks and adjust the Air Fuel mixture from idle to full throttle, at 5% throttle opening intervals under load... Then he prints out a Dyno Run and inspects it... From there, he goes back and tunes, adjust to make a smooth throttle response at any given point on the RPM range...

At the end, you end up with a bike that it's smooth a silk to ride... With optimized air fuel ratio and maximum power from the combination of power upgrades you have on your bike... A good Dyno Tuner can do a custom map in a few runs...

You can not do this from riding, and a screw driver or wrench... You can tweak your own bike, an probably get it to where you think it rides nice... A good engine tuner can make it ride even better with a Dynamometer... Maybe you have had bad experiences with an incompetent Engine Builder / Tuner... Just saying.

There is probably 20 shops in Arizona that claim to have Dyno Tuners... I trust only one... and, it is not the shop.... It is the guy that works there I trust... He is good!!!

As for the guy who tested the SV650 with and without snorkels, he is Zoran Vujasinovic from TWF Racing... www.twfracing.com

Luis