stage one
Stage IV
Joined: Jan 2012
Posts: 4
Likes: 0
From: Brisbane
think its a heavy breather air cleaner and performance pipes and tuner thats pretty much stage one.
someone will correct me if im wrong.
someone will correct me if im wrong.
Seasoned HDF Member
Joined: Oct 2010
Posts: 12,241
Likes: 7,829
From: Along the shoreline in SW FL
http://www.harley-performance.com/stage-1.html
It's become an over-used term...and has gotten fairly "loose" in what it means. Many people slap on an after market air intake and say their bike has Stage 1 mods. Or they'll just do pipes. Or both of those two...and with newer models not much has to be done to the computer module after putting on an air intake and pipes because the newer modules adjust OK.
So yeah, it's fairly loose as far as what it means. It's not any specific part...just generally "after market air intake, after market exhaust, and a new computer control download or controller".
Tourer
Joined: May 2010
Posts: 348
Likes: 5
From: The mitten state
To be precise! Stage ONE is a Harley term for adding BOTH "THE Screaming Eagle" stage one air cleaner AND the Screaming Eagle stage one exhaust. It also involves having your ECM re-flashed to "stage one".
What that means is those parts (A/cleaner and exhaust, THOSE HARLEY parts) have been recalibrated and the flash changes the V.E. ( predicted airflow in the fueling algorythm) for those exact parts. Using "other" open exhaust and or Air cleaner parts and getting a Stage one "flash" will be close but not exact.
The Stage on flash also raises the redline slightly for fuel cut off!
Lastly, Opening the AirCleaner has MORE affect on changing VE's than just exhaust alone.
So stage one is the installation of specific Harley exhaust and air cleaner with the corrisponding changes in calibration, to maintain proper A/F ratios for ALL operating conditions.
--------------------------------------------------------
Generic air cleaner and exhaust discussion:
If you increase airflow (higher flow air cleaner) you should also increase fuel. There is a reason WHY the limits on closed loop fuel learn are set where they are for production calibrations!
And it isn't to account for changes in PARTS airflow.It is for part to part variation of PRODUCTION parts. And to account for extereme and abnormal engine operations.
Under "NORMAL" conditions yes! The "Learn" values may be centered and allow for some changes. BUT! Under other extereme conditions (Ambient/Engine temp/alitutde, etc.) you will use the LIMIT of closed loop learn with just PRODUCTION parts. If you choose to not add any fueling device and depend on just the production adapts to correct for Open AIR CLEANERS and EXHAUST, under some conditions you will be "out of range" of the fuel control.
With the final thought, that under WOT conditions, which are OPEN LOOP, you MAY be far too lean without any fuel adding device and those changes!!
And it is those HIGH load and speed conditions where proper fueling is MOST critical!!
So I would NEVER advise someone to do aircleaner flow increases without also using "something" to adjust either VE's (stage one parts and flash) or a real tune with other aftermarket parts.
Some may "get away" with doing nothing for SOME time, but some will run too lean and do engine damage and/or increase detonation (inaudable)and also incur long term loss of durablity!
What that means is those parts (A/cleaner and exhaust, THOSE HARLEY parts) have been recalibrated and the flash changes the V.E. ( predicted airflow in the fueling algorythm) for those exact parts. Using "other" open exhaust and or Air cleaner parts and getting a Stage one "flash" will be close but not exact.
The Stage on flash also raises the redline slightly for fuel cut off!
Lastly, Opening the AirCleaner has MORE affect on changing VE's than just exhaust alone.
So stage one is the installation of specific Harley exhaust and air cleaner with the corrisponding changes in calibration, to maintain proper A/F ratios for ALL operating conditions.
--------------------------------------------------------
Generic air cleaner and exhaust discussion:
If you increase airflow (higher flow air cleaner) you should also increase fuel. There is a reason WHY the limits on closed loop fuel learn are set where they are for production calibrations!
And it isn't to account for changes in PARTS airflow.It is for part to part variation of PRODUCTION parts. And to account for extereme and abnormal engine operations.
Under "NORMAL" conditions yes! The "Learn" values may be centered and allow for some changes. BUT! Under other extereme conditions (Ambient/Engine temp/alitutde, etc.) you will use the LIMIT of closed loop learn with just PRODUCTION parts. If you choose to not add any fueling device and depend on just the production adapts to correct for Open AIR CLEANERS and EXHAUST, under some conditions you will be "out of range" of the fuel control.
With the final thought, that under WOT conditions, which are OPEN LOOP, you MAY be far too lean without any fuel adding device and those changes!!
And it is those HIGH load and speed conditions where proper fueling is MOST critical!!
So I would NEVER advise someone to do aircleaner flow increases without also using "something" to adjust either VE's (stage one parts and flash) or a real tune with other aftermarket parts.
Some may "get away" with doing nothing for SOME time, but some will run too lean and do engine damage and/or increase detonation (inaudable)and also incur long term loss of durablity!
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