2011 YZ450F What else is needed with an exhaust


15 replies to this topic
  • Pmason718

Posted July 03, 2011 - 10:33 PM

#1

If I bought this exhaust what else is needed? Do I really need a PC III or V?.

http://www.vanceandh.../YZ450/xcr.html

  • Pmason718

Posted July 04, 2011 - 08:53 PM

#2

no one?

  • Quernix

Posted July 04, 2011 - 09:46 PM

#3

No, you will be able to run that exhaust with no further mods. Test it stock and then decide if you like to powerband or not. The Yamaha Powertuner is a great tool (even though limited) and more than most riders will ever need for tuning the engine to their liking. It allows simple and quick trackside changes.

  • Pmason718

Posted July 05, 2011 - 06:01 AM

#4

so you would get the tuner before you bought an exhaust?

  • rdefonce

Posted July 05, 2011 - 08:49 AM

#5

so you would get the tuner before you bought an exhaust?


Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.
Just what I was looking for.

  • SEOINAGE

Posted July 05, 2011 - 09:28 AM

#6

Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.
Just what I was looking for.


Tuner alone made a huge difference for me.

  • Pmason718

Posted July 05, 2011 - 09:35 AM

#7

Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.
Just what I was looking for.


What exhaust did you go with?

Tuner alone made a huge difference for me.


What map are you using

  • SEOINAGE

Posted July 05, 2011 - 09:36 AM

#8

Jay Marmont map. Once I get my exhaust on I will see if it still works great, and tweak and try changes out to see if it matters.

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  • rdefonce

Posted July 05, 2011 - 12:14 PM

#9

What exhaust did you go with?



What map are you using


I went with MRD slip-on, super well made, in the USA! good price too.

  • 92db

Posted July 05, 2011 - 12:56 PM

#10

Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.
Just what I was looking for.


Your experience with slip ons is consistent with my buddies who ride.

The old adage how fast do you want to go=how much money do you have fits kind of fits the header question. Between the two I would go with a slip on over a header but if I had the moola I would go for a complete system.

  • grayracer513

Posted July 05, 2011 - 03:27 PM

#11

What is there about the stock '10-'12 header that needs correction?

  • TripleUp

Posted July 05, 2011 - 03:36 PM

#12

I know on the 09 and older YZ450's the stock header was very restrictive, is it the same on the 2010? Basically is a full system needed or is a slip-on all that is needed because the stock header is not restricting performance?

  • 92db

Posted July 05, 2011 - 03:39 PM

#13

It was actually the 08 and 09 YZ450Fs that had the "ice cream cone" mechanical muffler that really robbed power. 10s and 11s went back to conventional type mufflers.

  • grayracer513

Posted July 05, 2011 - 03:51 PM

#14

I know on the 09 and older YZ450's the stock header was very restrictive, is it the same on the 2010? Basically is a full system needed or is a slip-on all that is needed because the stock header is not restricting performance?

The '08-'09 was not restrictive; just the opposite, in a sense. It was too big to be effective with an unrestrictive muffler in place.

In the case of the '10+, the header is perfectly fine as is, and all that's needed is a muffler of the right length and core size. That's why MRD doesn't build (or charge for) a full system for the bike.

  • MRD RACING

Posted July 05, 2011 - 04:39 PM

#15

Gray is spot on , the 08/09 header was oversized to add volume for the exhaust to escape into to compensate for the baffeled muffler ( not a good design IMO ) so when you just add a slipon to those bikes you are giving up some lowend because of the large dia. of the header

  • Pmason718

Posted July 06, 2011 - 06:57 PM

#16

The '08-'09 was not restrictive; just the opposite, in a sense. It was too big to be effective with an unrestrictive muffler in place.

In the case of the '10+, the header is perfectly fine as is, and all that's needed is a muffler of the right length and core size. That's why MRD doesn't build (or charge for) a full system for the bike.


So if I bought the Yosi slip-on for this bike what else is needed (Power Commander?)





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