Jump to content

Mohawk

Member Contributer
 View Profile  See their activity

  • Posts

    1,979

  • Joined

  • Last visited

  • Days Won

    46

 Content Type 

Everything posted by Mohawk

  1. Mohawk
    Its one of the things I want to do once I retire. Just to keep my hands busy. Oil Cooler+line kit, FPR kit. +/- Injectors etc. Unfortunately I'm in the UK so, shipping would be a killer, for US guys, which is mostly where the market would be. But we really could do with a VFR store listing all the custom options we can get & who from.
  2. Mohawk
    You will need to increase the fuel rail pressure for any injectors other than stock. VFR800FI runs 2.5bar Pressure, anything newer runs 3 or 4 bar pressures. 929 is 3bar. I ran mine originally on 2.5bar but had to add loads of fuel using my RBR module. I tried 4bar but even on zero map it delivered way to much fuel. So switched to 3bar & its been great with better mpg to boot. One of the benefits of multi-hole injectors is that they produce finer fuel droplets which means better fuel air mix, which allows less fuel to be injected because it burns more completely. Hence the evolution from single pintle through 4-hole to 12, now 16-hole injectors. The greater the hole count, the smaller the holes the finer the fuel mist produced. Smaller holes require more pressure to deliver similar volumes of fuel in the same time frame. The stock pintle injector shoots the fuel out in a cone shape & relies on deflection off the intake walls to complete atomisation of the fuel. The 4-hole produces a V shaped finer spray directly into the inlet track either side of the intake bridge between the intake valves. This avoids wasted fuel being sprayed on to the bridge & sticking to the intake walls. There are many car videos on U-tube showing good gains from 4-hole compared to 1-hole. either way if you swap out the injectors you will need to correct the AFR with a combination of PC/RBR &/or fuel pressure regulator. There will be a market for an adaptor to use standard automotive FPR's as VFR ones are NLA & are not a standard fit. I had to make mine form a couple of adaptors. 1998 throttle bodies before And after I had to use the 90 degree to drop it below the airbox. There is only just enough room for this.
  3. Mohawk
    All of the add on inline fuel controllers work on a percentage basis. PC3, PC5, RBE, RBR etc. So if ECU commands X-duty cycle, say 50% then you add 10% via the fuel controller, its sends 55% to the injector as a timed signal. So at the same RPM's you can directly transfer any map to any other. They may need a little fine tuning once transferred, but should be pretty close.
  4. Mohawk
    Traxxion Dynamics Cartridges for the win 👍
  5. Mohawk
    5th gen was RC45 engine fitted with 180 crank +2mm added stroke. They were tuned to max ignition advance. Max I have been able to add up to 6k rpm is 3degrees on high octane fuel. The 6th gen revs to same as 5th gen rpm, 11,750 red line & 12,200 ignition rev limiter cut off. 6th gen has narrower included valve angle so valve pockets are cut at a different angle. Otherwise AFAIK pistons are the same.
  6. Mohawk
    You could always use 2-stroke IR EGT sensors, one per header.
  7. Mohawk
    The simple answer here would be to fit 2-stoke reed valve blocks into the plenum, thus if at any point the plenum chamber is at less than atmospheric pressure then they will open & allow air in !
  8. Mohawk
    Vtec has a narrower valve included angle.
  9. Mohawk
    You are s braver man than me to even consider that desth trap in motion 😂
  10. Mohawk
    I just found the wax unit on my Y2K model was fine if allowed to warm up before riding, but if I set off with it on, it would get too hot to soon & disengage, then when you slowed for a junction the bike would die as still to cold and fast idle was already off. Much better now with manual fast idle lever, wait until display says 60C then turn it off 👍
  11. Mohawk
    So I did a load of digging into this when I did mine. 4 hole from many car tests are much better than single hole, but 12 hole is more the norm, but the step up is not the same as 1-4 when compared with 4-12 but 1-12 is better. Some newer injectors are 16 hole. CBR600F4 & CBR929 injectors are the same 4 hole units with the same connector as 5th gen, just use the 5th gen mounting washers & remove the plastic orientation stub, which 5th gen does not have. But are designed for higher pressure. I tried with VFR regulator & had to add loads of fuel. I then tried 4bar, but was to much. So switched to 3bar & its great. I run 14.2 AFR on my RBR + MTB, runs clean, better MPG & no over heating even in silly 33c temps. The early Hayabusa used the same injectors as the 5th gen. You can buy fairly expensive Hayabusa aftermarket units, 12-16 hole. The simplest upgrade is a 6th gen throttle body, plus airbox, bottom half will do, as tops are the same. Just switch the TB harness at the large multi block that you tap for PC3/V or RBR etc. I can't guarantee the pinout is the same so consult a wiring diagram first. 2014+ 8th model looks the same as 6th gen, but I've never compared them in the flesh. YMMV A few people on here with 6th gens with 5th engines installed have reported better mpg with PC or RBR installed. The one advantage of the single hole pintle injector is that its effectively self cleaning & very hard to gum up. The tiny multi hole units are much easier to block. Hope that helps.
  12. Mohawk
    Fitted a nice Ti Rear brake lever clevis with Ti pin an nut. Saved 20grams & goes well with my PSR M/C Reservoir 👍
  13. Mohawk
    That Looks ready to roll, enjoy 👍
  14. Mohawk
    Alternately get those blasted & ceracoted 👍
  15. Mohawk
    If you need a replacement system then predator exhausts in the UK do a single silencer full stainless system. I had one on my 86 model. Made 59HP on the dyno with 56K/miles on the clock 👍
  16. Mohawk
    Hi Mohawk, Thank you for your donation of --. We look forward to improving the forums with your donation. Thanks VFRDiscussion
  17. Mohawk
    If you replace the ducati carrier with an Afam, JT or Renthal 5 bobbin Quick Change carrier, then Afam do a 520 45 tooth light weight steel sprocket for the 916, which I have paired with a 16T Yamaha R1 (15-16) 520 Rental light weight sprocket (309V-520-16P). They use the same output shaft splines as VFR800 ! Who knew 🤔 They may well do same for 6 bobbin carriers for 848/1098/1099 panigale etc
  18. Mohawk
    Which is which ? 🤔
  19. Mohawk
    Cleared the garage around it so I could get to it. Then refitted a charged battery. Wheeled it out & it fired up first press of the starter. I topped up the tyre pressures, tested everything still works & booked it in for an MoT on Tuesday morning 👍
  20. Mohawk
    What you are selling your baby ? Castrol for sure, but if you have both sets of panels, then both 👍
  21. Mohawk
    I ended up with a similar pig tail for my MTB wideband O2 sensor too ! 👍
  22. Mohawk
    Yes, they both operate on a % duty cycle change value. So +X value in one is similar to the other.
  23. Mohawk
    Well RB can claim whatever they like. I had my 5th gen running PC3 with custom dyno tune before RB install. I ran it for 500 miles on narrow band and it was nowhere near as good as the custom tune. So I bought a wideband AFR sensor & fitted that to the dash temporarily. I used it to modify the cells where it was out of whack. It got much better very quickly. Would have been better if I'd had a logger. Took it for a dyno run & it was still off a bit. Fitted an MTB & it was much better, next dyno run was much better. YMMV
  24. Mohawk
    The problem with the lambda sensor tuning is its fixed for 14.7 AFR lean running state. It only sends rich or lean not actual AFR values. Thus it can correct areas that are rich or lean but not set a specific target AFR you may desire. The wideband sensor MTB allows you to set a target AFR & it will auto tune to that target.
  25. Mohawk
    Racebolt UK do a couple of full Ti engine bolt kits. https://www.ebay.co.uk/itm/Honda-VFR800-98-2009-Titanium-Socket-Cap-Engine-Bolt-Kit-/303933918551?_trksid=p2349624.m46890.l49286 Either the cap heads above or with hex heads drilled for lock wiring.
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy.

  I accept