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Old Mar 3rd 2017, 05:00 AM   #1
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installed the cored stock exhasut from Phl

I have not had a chance to dyno it yet

but just bolting it on and still on the stock bike tune the bike runs noticeably stronger

there was a dip in the torque curve that you would come through when riding around town that I never was able to tune out. This is deff greatly improved to gone. This translates to a much more connected feel between the bike and your right wrist. I could feel the dip before as I was rolling on the gas, there would be a spot where more throttle didn't provide a linear change in acceleration. This feeling is now gone.

I am very busy and it will probably be a week or two before I can get it on the dyno but very impressed so far. My butt Dyno says around a 5 hp increase , I know from experience a butt dyno can be way off lol. but I would be shocked if it doesn't show a decent gain across the rev range.
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Old Jun 5th 2017, 07:23 PM   #2
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I Ride: Ninja 250R(track), RC390(street), 899 Panigale(street)
Hi, looking forward to the dyno runs, any chance you got them done?
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Old Jun 6th 2017, 06:06 AM   #3
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I did, next time im at the shop ill post them

had a very nice bump in midrange, but loss a few hp on top

I didn't spend hours trying to tune it but I couldn't get the power back on top with tuning

for most people after a nice addition in sounds that ride on the street, I think they would appreciate the midrange bump and not really mind the loss in peak power
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Old Jun 6th 2017, 11:04 PM   #4
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Originally Posted by vcyclenut View Post
I did, next time im at the shop ill post them

had a very nice bump in midrange, but loss a few hp on top

I didn't spend hours trying to tune it but I couldn't get the power back on top with tuning

for most people after a nice addition in sounds that ride on the street, I think they would appreciate the midrange bump and not really mind the loss in peak power
Hi, thank you for your reply! I'm assuming the loss of back pressure is causing some top end power loss, though from what I know back pressure affects torque more than Hp.
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Old Jun 14th 2017, 09:14 AM   #5
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when he modifies the canisters he just guts the internals, I think its getting turbulent inside them and causing to much resistance to exhaust flow

you can not over simplify it like what you said

exhausts work on a combination of scavenging and flow volume and speed.

sometimes if pipe is to big the extra volume will slow the exhaust speed down, reducing the scavenging effect and likely reduce torque at lower rpm's where you have a smaller volume of exhaust gas

sometimes if a stock pipe is to small the extra volume will allow for more flow and maintain good speed to keep the scavenging effect. This scenario will like show gains across the board

The Akrapovic full system showed gains across the range

im not a big fan off the term back pressure, but I get why people use it


Pretty much any time yea hear something that's a blanket rule with tuning its not true.

example you hear all the time would be that adding a full system will make a bike run lean.

sure it will likely be leaner at some spots and will likely be richer in others.

Whats lean and what is rich? To me they are relative terms, but that's a whole other discussion

Originally Posted by psych0hans View Post
Hi, thank you for your reply! I'm assuming the loss of back pressure is causing some top end power loss, though from what I know back pressure affects torque more than Hp.
Thanks from Phl, GunMoto and psych0hans
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Old Jun 27th 2017, 04:40 AM   #6
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here is the dyno run

as you can see it falls on its face on top, the spot where it would drop off would change a little from run to run but it was always there no matter what I did with fueling

for a street bike I think the slip ons are good value, nice sound and nice bump in midrange over the stock pipes
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installed the cored stock exhasut from Phl-6-27-2017-8-39-37-am.jpg  
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Old Jun 29th 2017, 04:24 AM   #7
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Originally Posted by vcyclenut View Post
when he modifies the canisters he just guts the internals, I think its getting turbulent inside them and causing to much resistance to exhaust flow

you can not over simplify it like what you said

exhausts work on a combination of scavenging and flow volume and speed.

sometimes if pipe is to big the extra volume will slow the exhaust speed down, reducing the scavenging effect and likely reduce torque at lower rpm's where you have a smaller volume of exhaust gas

sometimes if a stock pipe is to small the extra volume will allow for more flow and maintain good speed to keep the scavenging effect. This scenario will like show gains across the board

The Akrapovic full system showed gains across the range

im not a big fan off the term back pressure, but I get why people use it


Pretty much any time yea hear something that's a blanket rule with tuning its not true.

example you hear all the time would be that adding a full system will make a bike run lean.

sure it will likely be leaner at some spots and will likely be richer in others.

Whats lean and what is rich? To me they are relative terms, but that's a whole other discussion
Thanks for your reply. You're spot on about the oversimplified bit, there's definitely a lot that goes into an exhaust system design and I won't pretend to know even half of it, despite being a manufacturer of exhaust systems. This is becaus we don't actually design the exhausts we build, we work on customer drawings.

What I'm planning on doing is very different from Phil's work. I'll be gutting the entire internals of the exhaust and replacing it with a perforated "U" pipe, thus converting it into a proper free flow system without adding unnecessary turbulence. That's the plan anyways. If you look closely at the termi slipons it's a similar concept. Here is where I got the inspiration from.
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Old Jun 29th 2017, 05:07 AM   #8
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Yea I for sure only have a very basic understanding of it

I think without a doubt that will work

if it wasn't the most labor intensive exhaust I have ever installed id offer to dyno it for you when your done,


Originally Posted by psych0hans View Post
Thanks for your reply. You're spot on about the oversimplified bit, there's definitely a lot that goes into an exhaust system design and I won't pretend to know even half of it, despite being a manufacturer of exhaust systems. This is becaus we don't actually design the exhausts we build, we work on customer drawings.

What I'm planning on doing is very different from Phil's work. I'll be gutting the entire internals of the exhaust and replacing it with a perforated "U" pipe, thus converting it into a proper free flow system without adding unnecessary turbulence. That's the plan anyways. If you look closely at the termi slipons it's a similar concept. Here is where I got the inspiration from.
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