November 19th, 2019, 11:04 AM | #1 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
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Ninja 400 intake and exhaust mods with dyno results
This was posted elsewhere, but thought it should be in here as well (I didn't see it anywhere in the 400 section) -
https://www.norton-motorsports.com/2...dyno-shootout/ Some pretty extensive testing, thanks to Norton Motorsports. |
1 out of 1 members found this post helpful. |
November 19th, 2019, 11:28 AM | #2 |
ninjette.org sage
Name: michael
Location: Central Georgia
Join Date: May 2013 Motorcycle(s): 2019 Ninja 400, Sold 2012 Ninja 650, Sold 2009 Ninja 250r, Sold 2007 DRZ400s Posts: 628
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there's really nothing posted in the 400 forum. funny how it started as a 250 forum, had a decent amount of members with 300's when they came out, and maybe three 400 owners here. i have always liked this forum, too bad its slowed down so much. when i joined it was moving along at a pretty good clip.
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November 19th, 2019, 11:58 AM | #3 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
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I probably should have put this is the 400 Tech Talk section.
Maybe mods can move it. |
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November 19th, 2019, 05:26 PM | #4 |
ninjette.org certified postwhore
Name: Rick
Location: Alexandria, Louisiana
Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much.
MOTY - 2017, MOTM - Jan '19, Oct '16, May '14
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Thanks for the link.
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November 19th, 2019, 07:13 PM | #5 |
ninjette.org sage
Name: John
Location: Appleton, WI
Join Date: Apr 2015 Motorcycle(s): Ninja 300 (race), Ninja 1000 (road) Posts: 504
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Funny how all the 400 dyno charts I've seen have a flat top end. My old race 300 gained right up to the redline. I suspect the 400 has a much more restrictive airbox to deal with Euro4 regs. And those racing supersport rules are stuck with it. The bike is choking. Damn the bike could really see gains with pod filters.
My buddy who bought my old 300 is now building a 400. I hope he's not disappointed with the dyno results.
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Ninja 300 - CCS Ultralight Thunderbike Racing I want to "like" your post but I can't due to forum rules. Sorry. |
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November 19th, 2019, 09:59 PM | #6 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Most likely milder cam-specs. Easier to pass emissions that way. Also hefty low-end torque compared to 300 and 20-lbs lighter too!
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November 20th, 2019, 07:12 AM | #7 |
ninjette.org member
Name: John
Location: New Windsor
Join Date: Nov 2019 Motorcycle(s): GSXR 750, GSXR 600, Ninja 400, Ninja 300 Posts: 146
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Yes Norton suggests cutting the air box and removing the snorkels with their velocity stacks.
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1 out of 1 members found this post helpful. |
November 23rd, 2019, 06:40 AM | #8 | |
ninjette.org sage
Name: John
Location: Appleton, WI
Join Date: Apr 2015 Motorcycle(s): Ninja 300 (race), Ninja 1000 (road) Posts: 504
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Quote:
I hated the 400 when it came out, just messing up all the race classes. I was getting pissed off that the makers can't standardize on a class like 600 and 1000. But outside of that there's no denying that it's a nice bike.
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Ninja 300 - CCS Ultralight Thunderbike Racing I want to "like" your post but I can't due to forum rules. Sorry. |
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November 26th, 2019, 05:07 PM | #9 |
ninjette.org member
Name: Bret
Location: Richmond VA
Join Date: Jul 2016 Motorcycle(s): Shopping Posts: 31
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Wonder what just the snorkels hp gain is
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December 28th, 2019, 11:06 AM | #10 |
ninjette.org member
Name: Jesse
Location: San Diego
Join Date: Nov 2014 Motorcycle(s): Kawasaki Ninja 400, Yamaha R3 Posts: 14
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Changing the velocity stacks for ours completely wakes up the top end, even if you don't cut up the airbox. But cutting up the airbox and removing the snorkels just gives it the last little bit to maximize the gains from our velocit stacks.
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Cheers, Jesse Follow my build and racing at Norton-Motorsports.com |
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December 29th, 2019, 10:48 AM | #11 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
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For the Norton motor sports guy. Try my Dual stack idea. Basically make the primary stack as short as possible whilst maintaining a smooth intake radius with the correct taper. Then add a secondary velocity stack mounted in line with the primary one, where the base of the secondary is inline with the top of the primary. Make the secondary as long as reasonably possible, with a proper full curved top.
The short primary gives the best high RPM flow & the secondary catches most of the pulse wave from the short stack at lower rpms & reflects it back as if from a longer stack as well as straightening the air flow. I can send a diagram/picture of the setup I have on my 800. Be worth it to see if it improves airflow throughout the rpm range ! |
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