Odd ball mod

[gundoc_iowa]

Okay I have an 04 Vmax. On the left side near the "scoop" there is a small metal toggle switch. I thought it might be for the tail light or headlight to cut off the power. That wasn't it. I thought it might be to disable the bike so if someone tried to steal it. Nope. Turns out it is a three position switch....and with the switch in the middle position the idle drops and seems sometimes to even sputter a bit. With it left or right however, the bike idles perfectly. Running down the highway if you flip the switch to the left or right position you can feel a difference as well....wtf?

 

[johnpclynch]

Vboost short out switch?

Normal operation - Constant boost - boost off ???

 

[ninjaneer]

try to flip the switch into different positions and note at what rpms the vboost hits. 0, 3000, 6000? i wonder if it's a t-boost or z-boost selection switch

 

[[email protected]]

As noted, sounds like the common t-boost mod.

http://vmaxoutlaw.com/tech/TBoost.htm

 

[tugla]

you can look from the right side of the bike and see the vboost servo move, so switch in a position and rev it up and like the guys say should see it move at different rpm's.

 

[one2dmax]

Could also be one of Dale Walker Holeshot Autoboost modules.

 

[Rollie]

Try riding it and switching it at 3-4 K rpms . If there is a difference in sound & power , v-boost has been activated and you have a T-Boost installed . ( or the fan turned on , LOL ) .

 

[gundoc_iowa]

Cruising down the highway at 5000rpm it makes a slight difference. But would these mods affect it at idle?! It audibly and on the tach drops rpms at idle. Maybe 100 revs.

 

[gundoc_iowa]

Rode it into work, the Vboost kicks in at about 6500 like it always did. I don't get it.

 

[Rollie]

Rode it into work, the Vboost kicks in at about 6500 like it always did. I don't get it.

So you flipped the switch to the right and boost kicked in at 6500 , and then you flipped it to the left and the boost kicked in at 6500 as well ? What about the middle position ? Same thing ?

 

[Vendetta]

Cruising down the highway at 5000rpm it makes a slight difference. But would these mods affect it at idle?! It audibly and on the tach drops rpms at idle. Maybe 100 revs.

When the T-boost mod is done two diodes and a 4k resistor have to be wired in. Someone may have tried this mod and did it incorrectly.:confused2:

 

[[email protected]]

Get in there and investigate. Takes about 1 minute of wrenching to remove the faux and scoop. Should be able to trace out the wires from there.

 

[alorio1]

With the Vboost butterfly's in the open position, it does change the engine Idle. Its been so long since I had mine open, I can't remember if idle RPMs go up or down....

 

[gundoc_iowa]

No matter what position the switch is in Vboost licks in at 6500 rpm. Doesn't make any sense. Something is causing a draw in the mid position.

 

[RaWarrior]

Weird. "Old" t-boost things had to be spliced in and the resistors added as said above. The newer ones were plug-n-play, all that was contained in a little puck that had two "intercept" connectors, it just went between the factory harness and the servo controller. Those had switches for 3000-off-6000

Sounds like yours might be a constant boost/stock? Having the boost open at idle would make it way too rich and have a crappy(slow) idle.

Otherwise, yeah, dig into it and grab a picture of what you find attached to the switch.

Wonder if it's some sort of timing adjustment and not related to the boost at all?

 

[Rusty McNeil]

With the Vboost butterfly's in the open position, it does change the engine Idle. Its been so long since I had mine open, I can't remember if idle RPMs go up or down....

Open Vboost at idle will lower RPMS and give it a really nasty/good sounding idle..

If your idle is set low with Vboost closed and you open the vboost at idle sometimes it will even die if you don't raise the idle......

I ditched my whole Vboost system except for the butterflies, wired them open so they could be closed for synching, have never regreted it one time...Vboost is cool but I think it's a little over rated part of the "Myth"