HARLEY: Quiet baffle re-tune??
#1
Join Date: Jul 2014
Location: Windwardside, Saba N.A.
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Quiet baffle re-tune??
Got a 2014 SGS with 120R engine. Exhaust is V&H High Output Pro Pipe and it's dealer dyno-tuned with SEST. Exhaust noise doesn't bother me. Recently got a V&H "quiet baffle" to play with exhaust back pressure.
Question I have is does the engine need a new tune with "quiet baffle" installed?
Plan is to have local dyno shop do another tune anyway but wonder if the engine needs two tunes, one with and another without "quiet baffle"?
Question I have is does the engine need a new tune with "quiet baffle" installed?
Plan is to have local dyno shop do another tune anyway but wonder if the engine needs two tunes, one with and another without "quiet baffle"?
Last edited by Sierra977; 12-12-2016 at 01:03 PM.
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Join Date: Jul 2014
Location: Windwardside, Saba N.A.
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#7
Sounds good to me.
FWIW, most folks like the low rpm manners (responsiveness) with the quiet baffle, not to mention the reduction in noise.
Performance/race baffles are designed for higher rpm (ie:4000-up) performance rather than the lower rpm (1000-3500) performance with the quiet baffle.
Bob
FWIW, most folks like the low rpm manners (responsiveness) with the quiet baffle, not to mention the reduction in noise.
Performance/race baffles are designed for higher rpm (ie:4000-up) performance rather than the lower rpm (1000-3500) performance with the quiet baffle.
Bob
Last edited by FLTRI17; 12-20-2016 at 12:22 PM.
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#9
According to Steve at Fullsac, his 2-1/4" core makes less low end power and more top end power than the 1-3/4" That would indicate that the size of the outlet does change the airflow at different rpm. So, the questions are:
1. Is your quiet baffle more restrictive, or does it just use more exhaust packing/holes?
2. Are you running most of your cells closed loop? If so, the ECM will adjust fuel for more or less air flow up to about 10% (and gradually "learn" the new settings).
If you are open loop at 80 kPa and above (like most tunes), you will most likely be rich at full throttle, right when you need power the most. Probably not the best option.
1. Is your quiet baffle more restrictive, or does it just use more exhaust packing/holes?
2. Are you running most of your cells closed loop? If so, the ECM will adjust fuel for more or less air flow up to about 10% (and gradually "learn" the new settings).
If you are open loop at 80 kPa and above (like most tunes), you will most likely be rich at full throttle, right when you need power the most. Probably not the best option.
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Sierra977 (01-30-2017)
#10