Deceleration Popping
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
Likes: 224
From: Glendale AZ
I'm still really green with my PCV but learning fast with some expert advice from this forum and I've tried emailing the map. For some reason it doesn't transfer. I end up having to take a pic then emailing it to myself, then upload it to Photobucket then and only then can I post it....It's a PITA. With a fuel map for each cylinder, another for the timing.... tedious to say the least. Maybe a quick tutorial from a magnanimous savvy tuner would be awesome>
Ultimate HDF Member
Joined: Dec 2010
Posts: 7,776
Likes: 2,252
From: wet coast BC
Ral819 - I could be wrong but that SEPST might be your issue. It isn't as tunable as the SERT. The 0% column is how much gas is given when the throttle is at 0. Not being tunable shouldn't be a big problem because the fuelpak I have isn't tunable either and I have no decel popping. I do also have the Harley stage 1 download and never had decel popping before the fuelpak. I have BUB7 slip-ons and V&H dresser duals. Guess I am just lucky with the whole popping issue
PS - I have never had a dyno tune. Don't plan to either
PS - I have never had a dyno tune. Don't plan to either
Club Member
Joined: Jun 2007
Posts: 3,435
Likes: 28
From: Living in open carry state :D
kPa is the manifold absolute pressure measured and not the throttle position. Same throttle position with different loads will give you different kPa numbers.
Last edited by Airborne350G; Jun 17, 2012 at 12:27 PM.
Cruiser
Joined: Nov 2008
Posts: 107
Likes: 3
Originally Posted by RichardH
Luckily the beauty of TTS Mastertune allowed me to eliminate the popping exactly as the manual suggests. By enrichening (lowering) the AFR between 1500 and 3500 RPM in the 20kPa column by 5-10%.
Richard, Is the kPa on the TTS the 20% throttle position or does it mean something else?
Luckily the beauty of TTS Mastertune allowed me to eliminate the popping exactly as the manual suggests. By enrichening (lowering) the AFR between 1500 and 3500 RPM in the 20kPa column by 5-10%.
Richard, Is the kPa on the TTS the 20% throttle position or does it mean something else?
Or the Lambda table. Depending on your bike.
kPa is also displayed on the Closed Loop Bias table.
The percent TPS is seen during the VTune process when you try to get the cells green.
On the AFR table it is 9 columns (20-100kPa) x 17 rows (750-7000rpm). The AFR table is one of the 1st things you set. To Stoich.
The TTS manual is on their web site. P 57 displays the AFR Table.
Check it out. Lots of pictures, lots of tables. It only begins to make sense after reviewing the manual 5-6 times.
http://www.mastertune.net/files/calibrations.asp
You should see HD Motorcycle Files on the right side.
Delphi, assuming your bike uses Delphi
Manuals
Master_Tune_Tuning Guide-v133
Once you start tuning the bike you work with the VTune table.
This displays % TPS x RPM. P 65.
Grand HDF Member
Joined: Jun 2007
Posts: 4,598
Likes: 421
From: Lansing mi
My Son came over and tuned out my decel popping on my RK with my PCV. With advice I got from Keith at FM. We put 15 in the first column from 1500 rpm and up, nice improvement. Then we went up to 20's and now all the popping is gone.
Keith said if we had to go over 40 then he would had sent me a new map.
Keith said if we had to go over 40 then he would had sent me a new map.
Ultimate HDF Member
Joined: Feb 2012
Posts: 7,855
Likes: 11
From: Oroville,Washington.
Yeah,sounds like a Harley should. My stage ll 103 in the '10 RK pops a little on engine braking,and it runs a little rich. Not soiling my shorts over it.
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