Replacement airbox?
- Thread starter LD609315
- Start date
Because more air in quickly gives more power and quicker revving engines. Historically Polaris restricted some of Victory big bore bikes air boxes to meet emission targets. Flip side of fitting a free flowing exhaust.
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I understand the flow issues.
Exhaust is restricted because of sound output.
Intake may or may not be restricted; it is helpful to know that Polaris has this tendency with the big twins, but that doesn't necessarily make it so with the FTR. Completely different engine.
I am waiting as information becomes available from tuners and others that are in a position to investigate and provide solutions. That may take several more months, as I haven't even seen another FTR in the street in the ten weeks I've had mine.
I have been told that the just released K&N filter only adds 1-2 HP on the top, not worth the cleaning and oiling of a K&N every year, IMO.
Of course, that doesn't prove that a different intake arrangement as you suggest wouldn't work.
Exhaust is restricted because of sound output.
Intake may or may not be restricted; it is helpful to know that Polaris has this tendency with the big twins, but that doesn't necessarily make it so with the FTR. Completely different engine.
I am waiting as information becomes available from tuners and others that are in a position to investigate and provide solutions. That may take several more months, as I haven't even seen another FTR in the street in the ten weeks I've had mine.
I have been told that the just released K&N filter only adds 1-2 HP on the top, not worth the cleaning and oiling of a K&N every year, IMO.
Of course, that doesn't prove that a different intake arrangement as you suggest wouldn't work.
Max Kool
Well-known member
Can you explain what you mean by "too restricted"? In what way?
All the way up to 7500 rpm the airbox does a great job of tuning the engine for bottom and midrange torque, I love the punch it has basically everywhere. I'd be too afraid to loose some of that just to get an extra 10hp or so in the top of the rev range. I think our best bet is waiting for a specialist to change the airbox in a way that doesn't screw up the tuning of the current design. Just don't remove the snorkels in the front, it runs worse without them.
All the way up to 7500 rpm the airbox does a great job of tuning the engine for bottom and midrange torque, I love the punch it has basically everywhere. I'd be too afraid to loose some of that just to get an extra 10hp or so in the top of the rev range. I think our best bet is waiting for a specialist to change the airbox in a way that doesn't screw up the tuning of the current design. Just don't remove the snorkels in the front, it runs worse without them.
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I agree with Max.
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I agree with Max.
In retrospect, after viewing dyno charts, there may be something to the airbox as being an issue.
But pure flow from a less-restrictive air filter is usually not as beneficial as the flow harmonics/ram effect (intake and exhaust) that proper engineering provides.
Unfortunately, manufacturing and packaging issues may compromise airbox shape (and exhaust as well).
Both Scout and FTR share a torque dip from 4000 rpm to 5500 rpm. Scout aftermarket intakes seem to fill this dip, but that is on the Scout dyno runs. Note that the Scout runs about 25 hp short of the FTR, with the same basic engine architecture.
Nothing currently, to my knowledge, is available for the FTR, as far as airboxes or air box mods.
But pure flow from a less-restrictive air filter is usually not as beneficial as the flow harmonics/ram effect (intake and exhaust) that proper engineering provides.
Unfortunately, manufacturing and packaging issues may compromise airbox shape (and exhaust as well).
Both Scout and FTR share a torque dip from 4000 rpm to 5500 rpm. Scout aftermarket intakes seem to fill this dip, but that is on the Scout dyno runs. Note that the Scout runs about 25 hp short of the FTR, with the same basic engine architecture.
Nothing currently, to my knowledge, is available for the FTR, as far as airboxes or air box mods.
There is not. But a tune from Ryan fixes the 4-6k dip.
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Yes on the ftr fb page. Lots of them.
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i don't do social media, are they accessible with a link and no FB account?
Just sent Ryan an email, thanks for the reference.