Aftermarket pipes on efi systems

Mojavekid18

Mojavekid18

So im sure thumper talk already has good stuff on this somewhere, and if so feel free to link me up.

Anyways one of my close friends just got a 2014 yfz450 from the stealership over the weekend and already wants to put an exhaust on it. Since i'm the group mechanic i want to know if any changes need to be made to the efi mapping to account for more airflow, or will the system ritchen up on its own?

Thanks
 
Mihylo33

Mihylo33

none that I have ever heard of.... try FMF or Pro circuit for more info


Just checked up on this because I like being "in the know".....

No jetting changes required.....
However both site have now updated their jetting and fuel specs.

They now use 100% VP C-12 race gas to do their specs with 32:1 mix on 2Ts and VP U4.4 is recommended for 4Ts, but they use premium non ethanol pump gas for their 4Tspecs.
 
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jeremymach2015

jeremymach2015

Mojavekid18:
So im sure thumper talk already has good stuff on this somewhere, and if so feel free to link me up.

Anyways one of my close friends just got a 2014 yfz450 from the stealership over the weekend and already wants to put an exhaust on it. Since i'm the group mechanic i want to know if any changes need to be made to the efi mapping to account for more airflow, or will the system ritchen up on its own?

Thanks
Click to expand...
"group mechanic", i know your struggle
 
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