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VBoost problems
  #1  
Old 08-23-2011, 05:49 PM
jjones1990@sc.rr.com's Avatar
jjones1990@sc.rr.com jjones1990@sc.rr.com is offline
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Location: Florence, SC - USA
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My VMax: 1993 violet
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Unhappy VBoost problems

I have a 1993 VMax with a TBoost installation. I have had the bike since 2005. The VBoost has been working perfectly all this time. Even after I installed the TBoost, 4 years ago, everything worked as it should, 3K, 6K, off. The first time I noticed any problem was 2 weeks ago. I went out for a ride and the VBoost started opening @ 6K like it should, since the TBoost switch was set on 6K. On the way back home, I felt like berserking a bit, but the Boost did not kick in at all. The bike still has massive power with no dead spots, but now, I can't tell the difference in the power, no matter what the TBoost switch is set on. I don't hear the whirring sound of the VBoost in the startup phase and can't see any linkages moving, either. Could a faulty TBoost module create this scenario?

Help!

J J
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Re: VBoost problems
  #2  
Old 08-23-2011, 06:33 PM
Rhoy Carter's Avatar
Rhoy Carter Rhoy Carter is offline
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Default Re: VBoost problems

Check the connections under the left side scoop, they could have some corrosion causing it not to work.
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Re: VBoost problems
  #3  
Old 08-23-2011, 06:49 PM
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95spfldmax 95spfldmax is offline
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Default Re: VBoost problems

Quote:
Originally Posted by Rhoy Carter View Post
Check the connections under the left side scoop, they could have some corrosion causing it not to work.
after that "torque" the black box they are connected to a bit with the key on and see if you can make it "work". The black boxes are known to develop bad solder connections and sometimes burn up all together....
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Re: VBoost problems
  #4  
Old 08-23-2011, 10:11 PM
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jjones1990@sc.rr.com jjones1990@sc.rr.com is offline
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Join Date: Feb 2011
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My VMax: 1993 violet
My other bikes: 2002 xvs1100cl
Default Re: VBoost problems

Thanks a bunch, guys. I'll try all that stuff after I take the TBoost off and return everything back to the original state.

J J
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Re: VBoost problems
  #5  
Old 07-30-2013, 10:47 PM
tg77th tg77th is offline
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My VMax: 1986 Yellow
My other bikes: CBR600F3
Default Re: VBoost problems

I have the same problem on my 86. I wiggle the box and connectors and I can get it to cycle. But not consistently. Is there a way to chase down the problem to a solder issue or a power issue?
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Re: VBoost problems
  #6  
Old 07-31-2013, 02:11 PM
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VMAX1260 VMAX1260 is offline
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Default Re: VBoost problems

despite you don't hear the v-boost servo working , is good to take a look and with your eyes, go in N , as you raise the rpm look under the carbs to see if the v-boost is working. if not then you should check the plugs where you interfered when you installed the t-boost upgrade.
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