FI adjustment

[Fatboy]

I am fitting a set of Yoshi Slipons to my 08 ZX14, will I need a Power Commander or can I just get the bike retuned at a bike dealer??

Cheers

Fatboy

[MickLC]

With just slipons you won't need to do anything, it should be fine with the factory mapping. If you still wanted to change it you would need to use a powercommander.

[Fatboy]

Thanx Mick, I will try it without adjustment.

[hoffy]

yeah mate, slip ons are good as no changes required...it was only if you wanted more HP you would go a PC....but do you really need more ??

however, you may benefit from the secondry butterfly's being removed, Ive heard this is a good mod to improve low down power....speak to the 14 boys re this....

[Fatboy]

Not chasing any power improvements, just wanna make it sound less like an electric prius.

[Neilp]

The only way to be sure you are not harming your engine by running it to lean (after fittment of slipons) is to run it on a reputable dyno with a gas analyser attached (AF ratio), this will also show up any flat spots.


Neil

[Gosling1]

......The only way to be sure you are not harming your engine by running it to lean (after fittment of slipons) is to run it on a reputable dyno with a gas analyser attached (AF ratio), this will also show up any flat spots.....

Fitting slip-on mufflers only *WILL NOT* cause your engine to run lean, or harm it in any way shape or form. Why do people still think this is the case ?? Its just an old wives tale that dates back to the dark ages. (Fitting a full system with air filter mods etc etc *may* require re-jetting in some cases.) Any dyno shop that recommends a full diagnostic dyno-tune, when all you have done is just installed a slip-on muffler to replace a stock muffler, is ripping you off.

Every motorcycle made in Japan is set up *rich* from the factory - go and ask any workshop mechanic. They are set up rich, in order to ensure that if/when people change things, like mufflers, the engine will easily cope. They are set up rich to cope with shit-grade fuel. They are set up rich for a heap of other reasons as well. .....

As one example, when I had my ZX12R dynoe'd last year, the first thing the shop asked was 'what mods have you done ?' At that time, the only mods were a *BOLT-ON MUFFLER (Yoshi RS3), and a set of DNA filters......The shop owners exact words were " well that should get the a/f ratio right about where we want it. " he was dead right, the a/f ratio was now 'almost perfect' as a result of ditching the stock restrictive muffler, and this in turn leaned the factory 'rich' setting to a better position. No PCIII needed, no engine damage, no *nothing*, other than a great a/f ratio.

Flat-spots can also be tuned-out by fitting a PCIII, mapped properly on a dyno.

[MickLC]

Not chasing any power improvements, just wanna make it sound less like an electric prius.

I'm riding a borrowed 14 with a set of Akropovic slip on's and they sound veeeeery nice.

As NeilP said, the only way to be 100% sure is the dyno run with gas analyser, but I'd put money on it being fine (for the reasons Gos listed) and you'd just be wasting your money. Your best bet would be a dyno day where you might be able to get a run for $30 or something similar for a bit of piece of mind for not much outlay.

[Neilp]

......The only way to be sure you are not harming your engine by running it to lean (after fittment of slipons) is to run it on a reputable dyno with a gas analyser attached (AF ratio), this will also show up any flat spots.....

Fitting slip-on mufflers only *WILL NOT* cause your engine to run lean, or harm it in any way shape or form. Why do people still think this is the case ?? Its just an old wives tale that dates back to the dark ages. (Fitting a full system with air filter mods etc etc *may* require re-jetting in some cases.) Any dyno shop that recommends a full diagnostic dyno-tune, when all you have done is just installed a slip-on muffler to replace a stock muffler, is ripping you off.

Have to disagree with on this one Gos, when I had my slipon Muzzy's fitted to the ZZR the idle and just off idle was to say the least for want of a better word fluffy. So decided to have it put on the Lae dyno. The AF ratio was discovered to be averaging out at nearly 15 (bike was absolutely stock except for mufflers). An AFR going higher than 14.7:1 is considered to be a lean mixture and going below 14.7:1 is considered a rich mixture. Hence my ealier comment! (The only way to be sure you are not harming your engine by running it to lean (after fittment of slipons) is to run it on a reputable dyno with a gas analyser attached (AF ratio), this will also show up any flat spots.) Better to be safe than sorry in my opinion.

Neil

[Fatboy]

Hi Guys, thax for the advice
Just had the yoshi's fitted & took it for a quick blast with no obvious issues so with any luck it will run as sweet as it sounds.