Do replacing header pipes make a difference?
I've spent many days regretting trading in my CBR for that reason. Now I'm trying to convince a coworker to sell me his RC51
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
I have a dyno tune with my 2-into-1 as I did for the previous true duals, both done by the same chap at the same shop. No contest between the two! So no doubt the big radius will give their best with a good tune, but when compared with a 2-into-1.....
I'm sure that a full dyno tune will yield better results than an autotune or a canned tune. I'm not wanting to squeeze every last HP out of the bike, just want it to run a bit smoother. Last year I did adjust a canned tune with autotune and got better performance when I opened her up but didn't do much for just regular putting around town. Might need to look into a dyno run this summer.
Tourer
Joined: Sep 2014
Posts: 443
Likes: 87
From: Australia
yep, a good tuned length 2-1 will reap rewards, and a lot of the time right in the powercurve where you most feel it. Especially on a big twin with a bit of comp where the gains are really pronounced.
It's all personal preference, but I do love the sound of a well built/thought out 2-2. Proper hot rodding stuff with a decent sized bumpstick.
It's all personal preference, but I do love the sound of a well built/thought out 2-2. Proper hot rodding stuff with a decent sized bumpstick.
real world experience counts:
My Roadster with the Bobcat 79 HP
Customer's Roadster with V&H Grenades 69 HP
Both had same air cleaner and were tuned using same software and dyno
My Roadster with the Bobcat 79 HP
Customer's Roadster with V&H Grenades 69 HP
Both had same air cleaner and were tuned using same software and dyno
Winner winner chicken dinner
Last edited by cvaria; Jan 24, 2017 at 10:29 AM.
Grand HDF Member
Joined: Jan 2017
Posts: 3,837
Likes: 1,430
From: NJ
I'm sure that a full dyno tune will yield better results than an autotune or a canned tune. I'm not wanting to squeeze every last HP out of the bike, just want it to run a bit smoother. Last year I did adjust a canned tune with autotune and got better performance when I opened her up but didn't do much for just regular putting around town. Might need to look into a dyno run this summer.
2. Only going to be a good tune IF you know an incredible tuner,..good luck with that.
3. You have a PV. Call Dynojet and tell them about your concern. You may not have the appropriate base map. Once you have the best map and you've auto tuned,...dynojet can help you tweak from there.....for free. Why spend $400 on a PV if you're not going to take advantage of it?
4. When I went from big radius to 2 -1, my lower gears and slower riding were greatly improved. I may have lost a step at WOT on big end,..but I don't care. This was not a computer issue,..it was an exhaust flow issue.
The dyno tune will only squeeze the $$$ out of your pockets...as far as I've learned.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
I disagree - that's a far too simplistic view!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Grand HDF Member
Joined: Jan 2017
Posts: 3,837
Likes: 1,430
From: NJ
He has a simple set up. My point is he bought an expensive good tuner....you gotta use it. My bike runs awesome and I have a lessor tuner than he. If you want an HP sheet for bragging rights....get a dyno tune.
