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    Thread: build thread: 16v + cbr900 carbs + high compression

    1. Member yeayeayea's Avatar
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      01-31-2011 10:39 PM #51
      so what youre saying is that you want to run again? Im game

    2. Member OrangeDUB's Avatar
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      02-21-2011 01:15 PM #52
      Hey what did you end up doing for a throttle cable?

    3. Member yeayeayea's Avatar
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      02-21-2011 05:19 PM #53
      Quote Originally Posted by OrangeDUB View Post
      Hey what did you end up doing for a throttle cable?
      i made a bracket that bolts to the old intake manifold brace bolt holes in the head. this was the holder for the stock half of the throttle cable, then i used a cable coupler to attach another length of cable with the right end piece on it, which i believe came from a bicycle brake cable. cant remember 100%. however its eventually going to be a better setup.

    4. Member smoothAMBER's Avatar
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      02-27-2011 08:59 PM #54
      im into this! im doing the same swap right now! i have carbs and motor... where did you buy the 16v intake flange?

    5. Member yeayeayea's Avatar
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      02-28-2011 06:09 PM #55
      Quote Originally Posted by fcrich View Post
      im into this! im doing the same swap right now! i have carbs and motor... where did you buy the 16v intake flange?
      someone in an old cbr carb thread made them and was selling them. the thread is linked in this thread here somewhere. Im not sure he has any left though. Also, someone in this thread was making flanges
      http://forums.vwvortex.com/showthrea...1#post70247686

      if nothing else, contact Weir tec for flanges.



      Pics from yesterday


    6. Member IRDangerDave's Avatar
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      03-16-2011 10:55 AM #56
      Okay, I was slightly torn on doing carbs... but after seeing the dyno and the $$:HP ratio on this, I'm down.

      How large did you say you drilled your jets? And just to make sure I read everything right... 100% stock ignition, correct?
      Someday soon my friends, this ride will come to an end - but we can't just get in line again.

      ( I got a new MkII for you all to make fun of )

    7. Member yeayeayea's Avatar
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      03-16-2011 11:06 PM #57
      well i havnt hooked up my WOT switch yet which will give me more ignition advance. so there is still more power in this setup as it sits. But yes, 100 stock ignition except I havnt hooked up the throttle switches yet.

      The jets i will have to get back to you on that, its written down somewhere in another thread

    8. Geriatric Member steveo27's Avatar
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      03-17-2011 01:22 AM #58



      looks good broham
      YOUR STICKER CLUB SUCKS

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    9. Member yeayeayea's Avatar
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      03-17-2011 05:18 PM #59
      Quote Originally Posted by steveo27 View Post



      looks good broham
      thanks I cant wait to get rid of these wheels though. If 4x100 > 5x112 adapters weren't so expensive...

    10. Member yeayeayea's Avatar
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      04-16-2011 12:54 PM #60
      A bit of an update:

      No photos of anything lately as I broke my digital camera. However monday my new one should arrive (kodak z981) so expect some fancy shots of whats new.

      Also arriving this week: some gauges so I can keep an eye on things. First one is a VDO Vacuum gauge, in the Vision style. I had the VDO Boost gauge in this style back in my old mk3 2.0t, and I loved it.



      I am going to add vacuum ports to cyl's 1-3 so that i get a reading from all 4.

      Next is a Innovate MTX-L Wideband (3844 is the kit number i ordered, 3845 I believe is the same thing except for short wiring for use on powersports vehicles like motorcycles, besure to not order that one)



      I will be doing datalogging with the Logworks included with the Wideband, so we can get some real numbers on what the carbs are doing a/f wise. It also works on all fuel types, which may come in handy with some future plans I have



      44.3mm ITB's with mechanical fuel injection, belt driven fuel pump.
      Last edited by yeayeayea; 11-25-2012 at 03:46 PM.

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      04-16-2011 05:01 PM #61
      that's really cool, how does it meter the ammt of fuel?

    12. Member yeayeayea's Avatar
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      04-16-2011 06:33 PM #62
      Quote Originally Posted by HiFiLongboards View Post
      that's really cool, how does it meter the ammt of fuel?
      The box on the top of the throttle bodies controls fuel flow, in combination with the fuel pump. The Fuel pump flow is directly proportional to engine rpm, and the box on the throttle bodies meters flow directly proportional to throttle position. Its known as Hilborn injection i believe.

    13. Member yeayeayea's Avatar
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      04-16-2011 07:35 PM #63
      heres an ebay listing for the exact setup I have, and all he has is the throttles themselves, no pump or brackets!

      http://cgi.ebay.com/ebaymotors/Vinta...Q5fAccessories

      he is charging an extra 170 for a pump

      http://cgi.ebay.com/ebaymotors/Vinta...Q5fAccessories

      From the listing






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      04-17-2011 01:19 AM #64
      ^^^ What do you plan on doing with the mechanical injection stuff?

      Also, did you get 11:1 compression just by decking the head? I thought you needed pistons to get 11.

    15. Member yeayeayea's Avatar
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      04-17-2011 08:00 AM #65
      Quote Originally Posted by bmwquick View Post
      ^^^ What do you plan on doing with the mechanical injection stuff?

      Also, did you get 11:1 compression just by decking the head? I thought you needed pistons to get 11.
      Well I was told it was decked to 11:1. however I didnt have the work done, I bought the head as it is. If its not 11:1, im not too worried.

      as for the mechanical injection stuff, i dont know yet. it would require a lower manifoild to adapt the itbs to the 16v head. or I could get a set of gsxr ITB's and just use the fueling from this setup.

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      04-21-2011 01:28 AM #66
      The Hillborn setup would look awsome installed, but do you think you'll get any gains over the R1's? Its supposed to control fueling by varying fuel pressure, which...... is....... exactly how the stock CIS works, right? Looks great and I really want to see where you take this. I've been knocking around the idea of carbs and your thread has been inspirational.

    17. Member yeayeayea's Avatar
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      04-21-2011 04:32 PM #67
      The only power would come from them being 44mm throttle bodies vs the 38mm throttle bodies on the cbr carbs. These hilborn throttle bodies were designed for a ford pinto 2.0L engine, so the displacement is pretty much the same.

    18. Member yeayeayea's Avatar
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      04-22-2011 06:23 PM #68
      New camera, it shoots HD video so assuming the car is back together tonight, I will take some videos of it tomorrow

      Shots for now




    19. Member yeayeayea's Avatar
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      04-23-2011 11:26 PM #69
      So I didnt get to take any pictures of the car today, as I forgot my camera at home. However, I did get my recently repaired header back on, and installed my wideband. I am pleased to say that while the old narrowband AF gauge would read very lean at upper rpms, the wideband is showing steady high 13:1, low 14:1 all the way up to 8k. I dont know if the narrowband was getting a bad reading at upper rpms, but the new wideband does not have any problems. lower in the rpm range the a/f was in the 12:1 range, and cruising was in the 15:1 to 17:1 range.

      I will try to take videos and some logs once i have some spare time. The throttle cable broke on the way to a gtg today, so it is pieced together using a choke cable. Once that issue is resolved I will be able to get some videos put up


    20. Member woodrowstar's Avatar
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      04-24-2011 09:45 PM #70
      Quote Originally Posted by bmwquick View Post
      Its supposed to control fueling by varying fuel pressure, which...... is....... exactly how the stock CIS works, right?
      Who told you that BS??
      Last edited by woodrowstar; 04-24-2011 at 09:48 PM.

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      04-25-2011 01:24 AM #71
      Quote Originally Posted by woodrowstar View Post
      Who told you that BS??
      My Bentley. And OP, which said "The box on the top of the throttle bodies controls fuel flow, in combination with the fuel pump." The Fuel pump flow is directly proportional to engine rpm". Is that not that varying fuel pressure? CIS just varies pressure using the "flap" meter.

    22. Member woodrowstar's Avatar
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      04-25-2011 12:38 PM #72
      No. It is not. CIS is Pulse generated. Hilborne is metered by metering jets much like a throttle position switch. the pump is no different then a power steering pump, making reliable PSI versus a block mounted mechanical pump using an eccentric or push rod.

    23. Member yeayeayea's Avatar
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      04-25-2011 07:11 PM #73
      I will say I have very little idea how the hilborn stuff works, and I doubt I will ever run it. But it is cool oldschool race parts that I saved from going in the trash

      was going to take some video of the car today but the rigged throttle cable is preventing me from doing so
      Last edited by yeayeayea; 04-25-2011 at 07:14 PM.

    24. Member yeayeayea's Avatar
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      04-30-2011 11:49 PM #74
      So its time to make a new throttle cable, since my bicycle brake cable finally died.

      I am using a honda hood release cable, as it has the right size barrel end for the cbr900 carbs


      It has a barrel on one end and a ball on the other, i cut the ball off


      next I cut the J hook off the stock cable, and drilled out the cable that was left crimped inside it


      Here is what ends I will have once I determine my length


      hopefully tomorrow I will cut it to the right length and crimp and solder the j hook on and have a nice new throttle cable with no cable clamps anywhere


    25. Member yeayeayea's Avatar
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      05-01-2011 12:24 AM #75
      Also, now that I have my wideband hooked up I was wondering what A/f's i should be shooting for? Im in the 14's right now, but from what ive been reading the optimum a/f is in the high 12's to low 13's range.

      Guess it is time to play with needle jet settings

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