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Last Edit: August 06, 2014, 04:41:19 AM by drifter-paul
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Posted by chief
 - August 05, 2014, 12:00:25 PM

The FI boxes are permanently mounted. With the PCIII you need maps and should really have the bike dyno'd to get the best result. With the Cobra they are set out of the box for certain pipes, but work with many others. POTS (potentiometers) are simply "knobs" / switches which adjust certain ranges of the box.

A pipe exchange usually doesn't require a FI box... but that is dependent upon the pipes. My Big Willys caused decel backfiring so I added a Cobra, made on adjustment and its been fine since (12 years). Try the change without the box... if there are indications you need one you can add it afterwards.
Posted by pcarrell
 - August 05, 2014, 08:17:37 AM

I know that you asked Chief about this, but if you don't mind a little outside input.........

I have the V&H Longshots on my bike with the stock air filter, and I can say that all I had to do was marble the engine to control popping on deceleration and it runs like a champ.  The stock exhaust is so restrictive that opening up the exhaust with these pipes just makes it breath like it should.  The popping was always going on with the stock system, but it was so restricted that you just didn't hear it.

There's 2 ways to cure the popping.  I marbled my engine as it's a 5 minute fix, but I'll give you links to both ways.

http://www.gadgetjq.com/smogstuffremove.htm

http://www.gadgetjq.com/rv_removal.htm

Now, I have both of my pipes on one side, but I don't think adding the 1 foot of extra pipe to cross the already shorter pipe over to the other side would change anything.  By doing that, essentially, both pipes are roughly the same length, so it shouldn't make a difference.

Maybe 49 will chime in, as he's the author of the tip in the mods section?  http://www.vulcandrifterriders.com/vhbag.html

Posted by drifter-paul
 - August 05, 2014, 08:03:30 AM

Chief,

I've been reading/searching this topic on the forum & the Mods section - and getting a little confused.

My old original exhaust neds replacing. I'm thinking Vance & Hines as they seem popular and have model specific pipes on their site.
I have done the toaster fix & removed the emission hoses. I have the original air filter and intend to keep it.

Do I need a Power Commander 3 or similiar when I fit the V & H, or is that only when I replace both the air filter & use the toasters.
If a PCIII is required,  is this unit permanently mounted, or is it a tuning tool to plug in and then remove when it re-maps the ICU -
(assuming this is what it does , or does it override the ICU and need to remain plugged in to the electrics ?)
With regard to Cobra instead  of PCIII - what are POTS ?
I'm assuming that if i need a PCIII, then I need to tune it in using a Dyno tester. Is this correct ?

Thanks

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