Thanks Thanks:  0
Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: aftermarket pipe/ cpu

  1. #1
    Junior Member
    Bike: NC 700 and NC 750, and 2 bonnies
    Join Date
    Feb 2019
    Location
    Upstate NY
    Posts
    7

    Question aftermarket pipe/ cpu

    mY 2018 HAS A delkevic
    My wifes has a Danmoto
    Has anyone flashed? programmed the CPU for richer running or is this not necessary?

  2. #2
    Senior Member
    Bike: 2013 NC700X
    Join Date
    Apr 2019
    Location
    Northeast Alabama
    Posts
    630
    The way I understand it is with these bikes, changing intake (air filter) and exhaust does not mess with the fuel mixture enough to need remapping, and the oem ECU will adjust enough to safely run these aftermarket mods. Which is odd, I thought sure enough air filter, exhaust, and remap would really liven these things up, but that doesn't seem to be the case by the general consensus. I plan to read up more on this though, just doesn't seem right. Every other bike changing to a high flow air filter, more open exhaust, and remapping adds a decent bit of power. I can't see why these NC's should be any different. I need to learn more on the matter.

  3. #3
    Super Moderator aftermarket pipe/ cpu 670cc's Avatar
    Bike: NC700X, GL1800, KLX140G, CRF250L Rally, Ruckus 50
    Join Date
    Aug 2012
    Location
    USA
    Posts
    6,974
    Quote Originally Posted by TacomaJD View Post
    The way I understand it is with these bikes, changing intake (air filter) and exhaust does not mess with the fuel mixture enough to need remapping, and the oem ECU will adjust enough to safely run these aftermarket mods. Which is odd, I thought sure enough air filter, exhaust, and remap would really liven these things up, but that doesn't seem to be the case by the general consensus. I plan to read up more on this though, just doesn't seem right. Every other bike changing to a high flow air filter, more open exhaust, and remapping adds a decent bit of power. I can't see why these NC's should be any different. I need to learn more on the matter.
    One thing that sets the NC apart is the design of the cylinder head. See photo below. One throttle body feeds one intake in the head. The airflow is then split to the four intake valves. The four exhaust valves all funnel into one cylinder head outlet, which goes to the single catalytic converter. You could conclude, although there is no proof, that the amount of air the engine can flow is limited by the cylinder head design.

    The air filter is quite large for the displacement and power output, in my opinion. There is no reason to automatically assume that the air filter and/or the exhaust system is restricting the power output, as if Honda restricts flow intentionally on all bikes. I have a truck with 11 times the displacement and over 5 times the power of the 670cc NC, and it's air filter is at most only twice the size of the NC's filter.

    Lastly, the demographics of NC owners seems to be new riders, experienced and seasoned riders, and riders returning after an absence from the sport, but fewer riders in that stage of riding where they think they need more power, speed, bigger bike, etc. In general I don't think your average NC owner even cares much about adding horsepower, so there may be a lack of experimentation in that area.

    aftermarket pipe/ cpu-cutaway-jpg
    Last edited by 670cc; 7th May 2019 at 21:06.
    Greg
    GWRRA Member
    AMA Life Member
    "Quarter Million Mile Club"

    NanCyX . . . . . . . . . . The 250

  4. #4
    Senior Member aftermarket pipe/ cpu
    Bike: SV,NC,berg 570s
    Join Date
    Jan 2019
    Location
    CA
    Posts
    374
    there are those of us who would always like more power... obviously I knew going in that it'd be an awfully slow bike, at solidly double the weight of the bike I race and significantly less power, but that doesn't mean I don't appreciate a few more ponies and a few less pounds

    that's the main reason I ordered a decat pipe: weight (and space) savings
    12 NC700X
    11 FE570
    11 FS570
    15 450/520XCF SM

  5. #5
    Junior Member
    Bike: NC 700 and NC 750, and 2 bonnies
    Join Date
    Feb 2019
    Location
    Upstate NY
    Posts
    7
    Quote Originally Posted by 670cc View Post
    One thing that sets the NC apart is the design of the cylinder head. See photo below. One throttle body feeds one intake in the head. The airflow is then split to the four intake valves. The four exhaust valves all funnel into one cylinder head outlet, which goes to the single catalytic converter. You could conclude, although there is no proof, that the amount of air the engine can flow is limited by the cylinder head design.

    The air filter is quite large for the displacement and power output, in my opinion. There is no reason to automatically assume that the air filter and/or the exhaust system is restricting the power output, as if Honda restricts flow intentionally on all bikes. I have a truck with 11 times the displacement and over 5 times the power of the 670cc NC, and it's air filter is at most only twice the size of the NC's filter.

    Lastly, the demographics of NC owners seems to be new riders, experienced and seasoned riders, and riders returning after an absence from the sport, but fewer riders in that stage of riding where they think they need more power, speed, bigger bike, etc. In general I don't think your average NC owner even cares much about adding horsepower, so there may be a lack of experimentation in that area.

    aftermarket pipe/ cpu-cutaway-jpg
    WOW outstanding replies Thank you
    My Air cleaner is stock. The pipes on the bikes give them a nice deep growl at accelerating and slower speeds not for any increased power. these are unique machines and my wife and I get asked about them frequently, especially here in NY state

  6. #6
    Senior Member aftermarket pipe/ cpu
    aftermarket pipe/ cpu
    DirtFlier's Avatar
    Bike: 2013 NC700x/w DCT
    Join Date
    Dec 2014
    Location
    Troy, Ohio
    Posts
    902
    Yup, power is limited by the cylinder head design which by the way, fits perfectly into what they wanted for this bike, plus it is the only Honda motorcycle that I can recall with "undersquare" bore & stroke ratios so not destined to be a high RPM screamer. The NC's cyl head has everything integral so the intake manifold and exhaust plumbing is all done internally.

    It's not a good candidate for the typical hop-up tricks but I didn't buy it to modify anyhow. I'm happy to chug along at 2000-3000 RPM on my NC700X. :-)
    Last edited by DirtFlier; 8th May 2019 at 11:58.

  7. #7
    Senior Member
    Bike: 2013 NC700X
    Join Date
    Apr 2019
    Location
    Northeast Alabama
    Posts
    630
    Quote Originally Posted by Junkie View Post
    there are those of us who would always like more power... obviously I knew going in that it'd be an awfully slow bike, at solidly double the weight of the bike I race and significantly less power, but that doesn't mean I don't appreciate a few more ponies and a few less pounds

    that's the main reason I ordered a decat pipe: weight (and space) savings
    Did you notice any improvements with the decat pipe? I almost went with the Black Widow full system but had read too much about people saying the traditional mods really doesn't net gains on these bikes, so I went for the Yoshi slip on for sound and looks mainly. Catalytic converters definitely restrict air flow, but if the issue is that exhaust air flow from head is already kept to a minimum, I can see where that would not help much.

    As for low rev engines building power with the traditional mods, I know on a Yamaha Road Star Warrior 1700 (1670cc) fuel injected vtwin, a "big air kit, full decat exhaust, and power commander makes a significant power difference, and that engine redlines at 5k rpms. I've had 2 of them, those bikes will fly.

    Sent from my SM-G930V using Tapatalk
    Last edited by TacomaJD; 8th May 2019 at 15:10.

  8. #8
    Senior Member aftermarket pipe/ cpu superdedooperman's Avatar
    Bike: 2013 Red Honda NC700X
    Join Date
    Sep 2017
    Location
    Arkansas
    Posts
    281
    I have a black widow decat pipe and a delkevic 9” oval slip on. I haven’t noticed any difference in how it runs nor did I expect to. But I do enjoy the way it sounds

  9. #9
    Senior Member aftermarket pipe/ cpu dduelin's Avatar
    Bike: NC700XD, ST1300, Elite 80
    Join Date
    Jul 2012
    Location
    North FL USA
    Posts
    3,929
    These bikes aren't designed to "fly". The NC engine was intentionally designed for volumetric efficiency with power developed in the low and mid range. More power from customary modifications to flow more mixture bumps into single throttle body, long intake tract, undersquare long stroke, small valve area, siamesed exhaust port architecture that favors filling the automotive-style combustion chamber at low rpms rather than the usual motorcycle engine that develops power at mid range to high rpms.
    Dave

    GL1800
    NC700XD




  10. #10
    Super Moderator
    Bike: NC700x, ST1300, XR250L, CX500 Turbo, TRX350fwd, CT90, C70, TRX250, TRX 500, VFR1200x
    Join Date
    Dec 2012
    Location
    Wausau WI
    Posts
    1,814
    Quote Originally Posted by TacomaJD View Post
    The way I understand it is with these bikes, changing intake (air filter) and exhaust does not mess with the fuel mixture enough to need remapping, and the oem ECU will adjust enough to safely run these aftermarket mods. Which is odd, I thought sure enough air filter, exhaust, and remap would really liven these things up, but that doesn't seem to be the case by the general consensus. I plan to read up more on this though, just doesn't seem right. Every other bike changing to a high flow air filter, more open exhaust, and remapping adds a decent bit of power. I can't see why these NC's should be any different. I need to learn more on the matter.
    I can go back in the forum archives to 2012-2014 and review numerous threads on remap and tuning attempts. Several with dyno charts........the “pros” quickly gave up because there were no gains. Then add the added costs ..........it quickly lost value and interest by the tuners and the riders. Part of the reason there are no commander or other ECU tunes for the NC.

    Those archives threads mention your statements almost word for word........
    Last edited by showkey; 11th May 2019 at 11:28.

Similar Threads

  1. anybody fitted this shorty pipe?
    By ivenhoe in forum NC750 Modifications
    Replies: 4
    Last Post: 20th November 2017, 15:13
  2. Pipe dreams
    By drstimpy in forum NC700 Mods
    Replies: 5
    Last Post: 18th May 2016, 12:32
  3. Follow-up on my new Leo Vince pipe
    By MichaelJohn in forum NC700 Mods
    Replies: 5
    Last Post: 29th December 2015, 08:43
  4. Yoshimura R77 Slip On Pipe
    By goodrick in forum NC700 Mods
    Replies: 8
    Last Post: 12th August 2013, 14:16
  5. Moriwaki (Japanese) Pipe.
    By happy in forum NC700 Mods
    Replies: 3
    Last Post: 14th November 2012, 05:25

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •