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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #171  
Old 21st July 2019
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madnss madnss is offline
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Quote:
Originally Posted by 60Gunner View Post
The CycleShack slip ons, Rush slip ons, and while my Khromewerks HP Plus wasn't dyno'd against it, Dan and I compared my recent dyno and a Cycleshack dyno and mine was 2-3 hp higher at any given rpm. Not real scientific but the Cycleshack dyno had the same cams on their EFI dyno tuned shop mule. Mine was tuned by ear by myself, is carbed, and I was a little light on the main. I was still doing 87ft.lbs of torque by 4000rpm. 77ft.lbs at 2300rpm.
Like I said, not real scientific, but on the same bike you're going have a pretty hard time beating this exhaust til after 5000 rpm with any 2in1.
It was a favorite at an exhaust shootout at sportster.org years ago because it does so well over the entire rpm range. Not just up top.
Been around forever and the only exhaust baffle I know of with a patent.
One of the best kept secrets in exhaust IMHO.

Rush slip ons had the PD up to 5700rpm. Hammer compared a lot of exhausts to the PD. The dynos are on their website.

Rite on !
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  #172  
Old 21st July 2019
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Originally Posted by bustert View Post
exh only fine tune, cams set where the power lies
What? Lmao ok, sure

That’s a bold statement Cotton lol
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  #173  
Old 21st July 2019
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Quote:
Originally Posted by 60Gunner View Post
The CycleShack slip ons, Rush slip ons, and while my Khromewerks HP Plus wasn't dyno'd against it, Dan and I compared my recent dyno and a Cycleshack dyno and mine was 2-3 hp higher at any given rpm. Not real scientific but the Cycleshack dyno had the same cams on their EFI dyno tuned shop mule. Mine was tuned by ear by myself, is carbed, and I was a little light on the main. I was still doing 87ft.lbs of torque by 4000rpm. 77ft.lbs at 2300rpm.
Like I said, not real scientific, but on the same bike you're going have a pretty hard time beating this exhaust til after 5000 rpm with any 2in1.
It was a favorite at an exhaust shootout at sportster.org years ago because it does so well over the entire rpm range. Not just up top.
Been around forever and the only exhaust baffle I know of with a patent.
One of the best kept secrets in exhaust IMHO.

Rush slip ons had the PD up to 5700rpm. Hammer compared a lot of exhausts to the PD. The dynos are on their website.
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  #174  
Old 21st July 2019
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well, put a set of cams in and choke it, do they work well???
i guess you are one that believes headers are tuned right out the box, man heard that before.
man i got 20 more hp with my new headers but in reality, they lost 20 hp.
lets us not get into expansion chambers.
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  #175  
Old 21st July 2019
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Just to be clear, I'm not saying there aren't good 2in1s or one is better than the other. Just that there's duals out there that make just as good of power. Especially on a street bike thats not doing 7000rpm. I may or may not dyno again with my jetting changed and breathing issue fixed(umbrellas failed) but I'm quite certain conservative numbers are 88/88. Now that might not seem like a lot but for my cams(570s) on a carbed 1250, stock heads, and not dynotuned, it's pretty good when you consider I'm all in by 5500rpm. The torque curve for my exhaust is pretty much the same as my cams. So while it doesnt make huge peak power numbers, it comes on real strong from 3500 to 5500 then levels off. Makes for some really good torque where I want it.
That's why I went with the cams I did. They're a bolt on for stock rubbermounts and they're nice bump where I want but don't lose anywhere else.
So it all comes down to where you want your power. Much like choosing cams. I could get a little better peak HP numbers with something like the PD but I'd be losing some of that power further down.
The PD was an exceptionally good 2 in 1 in the fact it performed pretty good at lower rpm and pretty much sets the standards above 5500.
The supertrapp supermeg is adjustable where you can move the power band up or down the rpm range. But adjust it for best peak HP and it won't do so well further down. If memory serves it had some pretty good reversion issues in some areas at least in some configurations.
So what constitutes a good exhaust is subjective to a point but don't rule out a good 2in2 because you think only 2in1s make good power.
Asking what the best exhaust is is like asking what the best cams are. Depends on what you need it to do.
Why would you want an exhaust that makes it's best power at 5000 to 7000 rpm but doesn't do so well at lower rpm if you never wind you motor out more than 3000. And there's people here that ride like that.
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Last edited by 60Gunner; 21st July 2019 at 18:36..
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  #176  
Old 21st July 2019
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Quote:
Originally Posted by bustert View Post
well, put a set of cams in and choke it, do they work well???
i guess you are one that believes headers are tuned right out the box, man heard that before.
man i got 20 more hp with my new headers but in reality, they lost 20 hp.
lets us not get into expansion chambers.
I guess I am lmao or not.

Headers, tuned, expansion chambers.....sure thing pal

I Test my results with a dyno or 1/4, 1/8 mile mph. I’m good to go in all categories chief.
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  #177  
Old 21st July 2019
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In my experience with the evo 5 speed. Exhaust choice is way more crucial and moves the powerband around way more than a cam sets.
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  #178  
Old 21st July 2019
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It takes very little HP to cruise at 60 to 70 MPH, but when I'm ripping through the gears at 7400 RPM I want all I can get.
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  #179  
Old 22nd July 2019
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Quote:
Originally Posted by madnss View Post
In my experience with the evo 5 speed. Exhaust choice is way more crucial and moves the powerband around way more than a cam sets.
I agree...to a point. It sure can have an affect on how well the cams have an effect if that makes sense. Especially with cams like mine with 56° overlap. The exhaust if plays well with them that overlap really helps performance but that overlap can really hurt if the exhaust isn't up to the task.

Last edited by 60Gunner; 22nd July 2019 at 01:48..
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  #180  
Old 22nd July 2019
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Originally Posted by hexnut View Post
It takes very little HP to cruise at 60 to 70 MPH, but when I'm ripping through the gears at 7400 RPM I want all I can get.
I cruise at higher rpm than most probably. I spend 90% of my time cruising around 3500 or so but rarely wind it out much more than 5500 to 6000 but a lot of upshifting/downshifting.
I'm in my power curve most of the time.
Gotta admit 90ft.lbs.of torque coming on by 4000rpm is a fun ass street bike.

Last edited by 60Gunner; 22nd July 2019 at 01:55..
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