Yosh Box Fantasys

[OB_Jay Mack]

Has anyone had a good experience changing their fuel injection with the Yosh Box, rather than resorting to the much more expensive POWER COMMANDER II and the dreaded Dynomometer test.

 

[OB_Dennis D.]

What? Wait a minute, I thought the YOSH box is more expensive. Their website lists it at $400. Dynojet lists for $330. Street prices could be lower, but they start out $70 apart.

I'll say this, the YOSH website says squat about the product. All you have to see is a crude picture of the box. I don't think it has any way to hook it up to a PC to look at the map like the PC-II.

At $70 more in price, the YOSH box may still have some virtues, but from what I've heard from the others on this board, almost everyone is recomending the PC-II.

 

[OB_SUPERTUNER]

"Dreaded"...Dynamometer tests?...splain to me this.

 

[OB_WARBIRD]

Thats when someone thinks a dyno run is hard on their bike but runs the heck out of it on the street. [i.e. doing burnouts for their friends bouncing the motor off the rev limiter.]

 

[OB_Johnnycheese]

if you are doing MINOR changes to bike the Yosh box is fine.
But after looking at my plugs and seeeing WHITE with stock pipes and +10+10+10 with the Yosh box.
PC2 is the way to go.
AS far as a dyno you need some one who KNOWS what they are doing.

 

[OB_Jay Mack]

Yes, you see, what I was getting at is that one does not actually BUY a Yosh box, one has ones service technician make the adjustments using an exhaust gas analyser for a one time fee, like $60. I dread the Dynomometer because one ruined my new 2000 Blackbird, which is why I have a 'busa in the first place.
I have come to understand now, from a recent MOTORCYCLIST article, that a Dynomometer is indeed very hard on a motor. However, a Dynojet 150 or 250 isn't a Dynomometer, it's an Accelerometer, and not so hard on a virgin as a dyno. In any case, I'm askeered of'm and I haven't got one handy anyhow.
I don't need to race, I just need to line up my pipe with the fuel injection and if the Yosh box will serve, I'd be happy to pocket the dosh, as they say.

 

[OB_Johnnycheese]

You do not need and EGA machine for the yosh box just set it ride it and change it if it does not feel right.

 

[Guest]

I have a full mod airbox, 1mm over Tbodies, and a PC2. Plugs are perfect, bike runs great.

.01

 

[DaveO]

Yosh box works fine for remaps with pipe/air filter change. It does not have the adjustabilty that the PC2 has. You can only add or subtract up to 10% with the Yosh box, in 5% increments. Most bikes with a pipe will run well by just adding 5% in low/med setting. Leave the idle settings stock to start.

I believe there is more power to be gained with the PC2, and will dyno my Busa using PC2 VS Yosh box to find out.

FYI ALL the Busa's I have dyno'd/mapped with Yosh box made the best power with NO extra fuel up top.

Dave

 

[OB_Dennis D.]

Jay Mack,

I just went through the pros and cons comparing the two boxes. I went for the PC-II because it is more versatile, *if* you have access to a laptop PC, AND it can reset ignition timing (only above 4,000 rpm). The YOSH box cannot alter timing.

Being able to make timing changes would be useful for certain modifications, such as a turbo mod, higher C/R or with high octane racing fuel in the tank. As far as I know, the "consumer" available YOSH box is not able to address these specialized tuning requirements.

Neither product forces you to go to a dyno shop, but if not, they both impose a lot of guess work on the user. An EGA, which I think both OEMs sell as well, would help in tuning process as would an AFR analyzer. Both these type of accessories are likely to be expensive, so going to a Tuner is a viable alternative if he has such an analyzer.

The PC-II has a broader market and appeals to the computer literate, ie. "hackers". There are a bunch of maps floating around out there, being shared and constantly evolving for various bike configurations.

The problem, however, each bike is different and there is really no one ideal map common to all similarly modified bikes; not even two bone stock bikes are truly identical in terms of optimized tuning. And there are environmental factors to consider, ie. OAT, humidity, altitude, etc, in addition to warranty concerns.

The worst thing about the YOSH box, if you go the "service tech" route, is being dependent on a shop for minor changes the average computer hacker and bike owner may be capable of making himself. Personally, I'm getting a PC-II to aid in correcting an
off idle stumble condition, now that my bike has slip on exhaust cannisters, and yes, I am somewhat of a "hobbyist".

[This message has been edited by dsinned (edited 02 August 2000).]

 

[OB_BullDog]

The YOSH box is a tool, that can be used on any F.I. Suzuki. You make a minor adjustment to the ECU unplug it and drive away, the tool stays on the bench. Every Suzuki dealer should have one of these boxes and charge for each use. The box will change your low/mid & high rev range by 5%.

The Dynojet Powercommander II is a compact accessory that plugs into your ECU and stays on your bike holding a different map in it's memory. You can change this map to suit the different mods to your bike. Unplug the PC2 and the ECU is still bone stock, where as the Yosh Box settings are permanent and need to be zeroed out before installing a PC2.


Understand the difference now?