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Discussion Starter · #1 ·
Tomorrow I'm having the Kury "skull" air filter/housing put on the X. The guy recommended a Power Commander. There are no other mods to the bike mechanically wise, and I have the stock exhaust. What say ye?

Mark
 

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PC3 is a good recommendation but absolutely not necessary.
 

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The short answer is, No. They are not needed, but you might want to add one to get the best possible performance and fuel mileage out of the additions. Most members run without a fuel manager while having aftermarket air intakes and exhaust and have no problems at all. The following is from the “Sticky” thread called,“Air,Fuel,Motor,Missives…” and the first post by Tapper. The entire post is filled with great information on the VTX engine.

Tapper said:


After Market Fuel Computers

This is a good time to talk about aftermarket fuel controllers, so lets hit on what they do real quick. The 1300 guys can manipulate their A/F ratios by changing jets, but it’s a bit more complex (and expensive) for the 1800 riders. For the VTX, there are basically three types of controller available. All three do exactly the same thing – they manipulate the amount of time the injectors are turned on during the intake stroke, by intercepting the voltage the ECU sends to the injectors. How the decide how much longer or shorter to turn the injector on, varies a bit though, and that variety is important thing to know when selecting which controller to use on your bike (if in fact you choose to use on at all – none of them are ever really necessary, regardless of what pipes or airboxes you add on to the bike.)


It’s also important to understand this: None of these controllers is ever a necessity, regardless of whether you change pipes or airboxes on your bike. The stock ECU will, in almost every case, adjust to the changes in airflow you’ve caused, and give you a reasonably good A/F ratio.
But you should understand, that the ECU is not programmed to give you an A/F ratio that is optimized for horsepower from the factory – instead, Honda worries about things like pollution, engine temperature, and rider perception, and so the ECU can be said to be “de-tuned” in order to address these other concerns. So the real function of these add-on controllers is to correct the error (or eliminate the de-tuning) that Honda induced in your fuel curve on purpose, in order to reclaim the lost horsepower and improve engine efficiency (possibly at the cost of making more pollution, hearing more deceleration backfiring, etc). Adding on aftermarket pipes or airboxes can sometimes exaggerate this de-tuning as well, so we need to be able to modify our fuel curves to match the configuration of our bikes. Got that? These boxes aren’t necessary, but if you’re hunting more horses, they can sure find them.
 

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Discussion Starter · #5 ·
Thanks for the info guys. I think I'll go without a PC and see how she runs. I can always add one later if I'm not happy with it.

Mark
 

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I put the Kury Hypercharger on my 1800 C in the fall. I read the above statements and got the similar, if not the same reponses, when I went hunting for info on the subject back in September. When I asked our counter at the local bike shop, he said the same, but he said if it were him he would do the air intake the power commander and the pipes to complete the bike. And yes, boy did we find some more horses! To the point that when I picked it up, they told me to be very careful for a while until I got used to it. Best decision I ever made regarding the bike. The Vance and Hines sound great, the Hypercharger looks cool, and the bike really turns loose when I want it too (Plus, I get an extra 5 to 8 miles per gallon on the highway). Best of luck, the whole thing cost me about 1,500 with wrech time and parts.
 

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Discussion Starter · #7 ·
That's cool Jaydog. I've got 2 payments left on the Big X. I'm going on a 2 week trip out west next month, so I'm trying to save some green. Next year I will probably do pipes and PC, as I'm sure I'll like the differences of which you speak!

Mark
 

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My 2 cents,
I installed the PCIII a few weeks ago to a completly stock 1800c set up. Man, what a diiference in performance. The mileage went up about 10 %. I am getting the Kury Hyper charger next pay check. The pc came from dyno jet set up for my stock arrangement. after the hyper charger I'll be learning how to program and set up. more fun to look forward to!!
Next year some killer pipes.
My advice... it is woth it, you will notice a performance difference.
 

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ghost-flame.
be careful you're not getting mileage gains by leaning the bike too much. vtx1800's and the pc3 maps are inherently lean at low...mine was darn near dangerous levels before i got it dynoed....and that was with a "perfectly" matching power commander website map....

just my experience....may be different for your bike.


John
 

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How do you know it is lean if you don't have an air/fuel sniffer or o2 sensor??
You can't know, these maps have been around for years and no one has ever complained about them being lean, even the dyno tuners that made most of them WITH the air/fuel sniffer do not make them lean. Especially not "Dangerously lean" as you put it.
 

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Chicago-Spike said:
How do you know it is lean if you don't have an air/fuel sniffer or o2 sensor??
You can't know, these maps have been around for years and no one has ever complained about them being lean, even the dyno tuners that made most of them WITH the air/fuel sniffer do not make them lean. Especially not "Dangerously lean" as you put it.
Could I be doing any damage to the bike if it were to run "dangerously Lean"?
The bike runs better than great, the mileage is still up at 35/36 from about 31mpg before the pcIII Should I get it dyno-ed?
Tom
 

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I seriously doubt it is dangerously lean. The X runs rich as is, and if you're using a map from Bareasschoppers.com or Powercommander.com, they are not lean. The maps on bareasschoppers.com were all custom maps done on dyno's and most of all of them used a load dyno with an air/fuel sniffer. If you feel the need to put it on a dyno, be sure to ask if it is a load dyno and that they use air/fuel sniffer's to adjust the air/fuel mix correctly
 
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