Automatic Re-mapping
Ultimate HDF Member
Joined: Sep 2005
Posts: 8,641
Likes: 26
From: Ozark Country
To put it in simple terms, think of your engine as noting but a big 'air pump'....
Air is pumped in, mixed with fuel, ignited, and then the exhaust exits through the pipes.
From the factory the 'computer' tables on EFI bikes are set assuming that a fixed amount of air will be entering the engine, and a fixed amount of fuel is added to that air to provide a 'semi accurate' air/fuel mixture.
When you add a 'high flowing' air intake system more air is pumped into the engine, and when mixed with the fixed amount of fuel the mixture will be too lean. This fixed amount of fuel is determined by either the jets in a carb or the current 'fuel map' in the computer of EFI systems.
That is why it is more critical to verify that you have the correct air/fuel mixture after adding a high flowing intake. It will probably be too lean, meaning you will need to rejet the carb or 'remap' the computer on EFI bikes.
Not as critical on the exhaust side as pipes aren't actually impacting the air/fuel mixture being pumped into the engine.
Air is pumped in, mixed with fuel, ignited, and then the exhaust exits through the pipes.
From the factory the 'computer' tables on EFI bikes are set assuming that a fixed amount of air will be entering the engine, and a fixed amount of fuel is added to that air to provide a 'semi accurate' air/fuel mixture.
When you add a 'high flowing' air intake system more air is pumped into the engine, and when mixed with the fixed amount of fuel the mixture will be too lean. This fixed amount of fuel is determined by either the jets in a carb or the current 'fuel map' in the computer of EFI systems.
That is why it is more critical to verify that you have the correct air/fuel mixture after adding a high flowing intake. It will probably be too lean, meaning you will need to rejet the carb or 'remap' the computer on EFI bikes.
Not as critical on the exhaust side as pipes aren't actually impacting the air/fuel mixture being pumped into the engine.
Cruiser
Joined: Oct 2009
Posts: 225
Likes: 0
Hi themac 51510
I have not read about this one but I notice-
"Data recording is activated with a push of a button, so the VCI can be used to gather data during true race conditions"
Does that mean you have to take the seat off to activate it by pressing the button?
I have not read about this one but I notice-
"Data recording is activated with a push of a button, so the VCI can be used to gather data during true race conditions"
Does that mean you have to take the seat off to activate it by pressing the button?
But...the VCI does store a copy of the map you load to the ECM on it, so if you are ever on the road and need it, like at a shop, you've got it if you have it on you.
Last edited by themac5150; Nov 22, 2009 at 03:38 PM.
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,594
Likes: 4
From: Moore, Oklahoma
So, if I was to restrict the air flow in some way, I would be fine until which time I could install a PC5? I could cover the filter with something that restricts airflow but for an opening the same size as what is on the stock air cover.
Cruiser
Joined: Oct 2009
Posts: 225
Likes: 0
I'd just run the stock airfilter/intake setup until you can manage the AFR.
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,594
Likes: 4
From: Moore, Oklahoma
Already got the AC and all other take-off parts listed on ebay. Not a big deal though, can't ride much here in Wyoming this time of year anyway. I will get the PC5 and tune it, then take it to the stealer and have them fine tune it. I already emailed Power Commander and asked them what the best map is for my set up. So, I can buy the PC in a few weeks and install it, and go from there.
Stellar HDF Member
Joined: Oct 2007
Posts: 2,806
Likes: 1,754
From: New Bern NC
To put it in simple terms, think of your engine as noting but a big 'air pump'....
Air is pumped in, mixed with fuel, ignited, and then the exhaust exits through the pipes.
From the factory the 'computer' tables on EFI bikes are set assuming that a fixed amount of air will be entering the engine, and a fixed amount of fuel is added to that air to provide a 'semi accurate' air/fuel mixture.
When you add a 'high flowing' air intake system more air is pumped into the engine, and when mixed with the fixed amount of fuel the mixture will be too lean. This fixed amount of fuel is determined by either the jets in a carb or the current 'fuel map' in the computer of EFI systems.
That is why it is more critical to verify that you have the correct air/fuel mixture after adding a high flowing intake. It will probably be too lean, meaning you will need to rejet the carb or 'remap' the computer on EFI bikes.
Not as critical on the exhaust side as pipes aren't actually impacting the air/fuel mixture being pumped into the engine.
Air is pumped in, mixed with fuel, ignited, and then the exhaust exits through the pipes.
From the factory the 'computer' tables on EFI bikes are set assuming that a fixed amount of air will be entering the engine, and a fixed amount of fuel is added to that air to provide a 'semi accurate' air/fuel mixture.
When you add a 'high flowing' air intake system more air is pumped into the engine, and when mixed with the fixed amount of fuel the mixture will be too lean. This fixed amount of fuel is determined by either the jets in a carb or the current 'fuel map' in the computer of EFI systems.
That is why it is more critical to verify that you have the correct air/fuel mixture after adding a high flowing intake. It will probably be too lean, meaning you will need to rejet the carb or 'remap' the computer on EFI bikes.
Not as critical on the exhaust side as pipes aren't actually impacting the air/fuel mixture being pumped into the engine.
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,594
Likes: 4
From: Moore, Oklahoma
now I am confused. I searched a little harder on the PC site and they list a 15-013 for my bike as "under developement". I checked ebay and there is one for 289.00. Is this BS or is the PC site behind?
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Thread Starter
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Novice
Joined: Nov 2009
Posts: 17
Likes: 0
From: Southampton
HI Guys, I am now understnding how the things work and why I need one thanks for all your imput. I am still leaning towards the ThunderMax though just because of ease of use and the bit where it auto tunes itself. But like I say if there is somthing better in 6 months time, let me know
cheers Derek
cheers Derek