mark524
Expert Class
Posts: 297
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posted September 12, 2007 02:31 AM
Has anyone maxed out the injectors?
Took my bike to a dyno to see if my a/f was safe with nitrous. I had added 15% with a 40hp jet. The plugs looked alright but the a/f read around 13.3, so we tried to richen it up and couldn't get it much better. Then we saw that the duty cycle on the injectors was going to 100%. So no matter how much fuel we threw at it, it stayed the same. I haven't heard of anyone having this problem yet.
It was pushing 70-72% duty cycle on motor, that just seems high to me. could I need a bigger fuel pump? Is there a way to check the flow of the fuel pump? The bike only has 2200 miles on it so the injectors should be clean since I occasionally run oxygenated fuel through it and drain it often.
  
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Halvefast
Zone Head
Posts: 806
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posted September 12, 2007 05:47 AM
Check to make sure Fresh Air System is disabled, it can throw of AFR.
Heard this from a guy in Australia on another board, meesed with his tune. ???
Orient Express is pushing 400hp out of stk injectors on a turbo kit!
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chunter
Expert Class
Posts: 195
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posted September 12, 2007 05:54 AM
Yep, I've sprayed 100 dry on top of my 210hp motor w/out maxing out on duty cycle.
When dynoing the operator needs to block off or crimp off the fresh air system.
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hopeitsfast
Novice Class
Posts: 75
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posted September 12, 2007 06:12 AM
quote:
Yep, I've sprayed 100 dry on top of my 210hp motor w/out maxing out on duty cycle.
When dynoing the operator needs to block off or crimp off the fresh air system.
can you please list your upgrades that make 210H.P. on motor. that is sweet.
____________
06 zx14 black ( stock)
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mark524
Expert Class
Posts: 297
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posted September 12, 2007 07:15 AM
when you say fresh air system, you mean the tube above the engine that goes into the bottom of the air box? I have that plugged.
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R Muzzy
Parking Attendant
Posts: 22
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posted September 12, 2007 09:32 AM
50% over 0 map will max the injectors.
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chunter
Expert Class
Posts: 195
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posted September 12, 2007 10:30 AM
crank, pistons, port work, valve springs
need to pinch off the tube from the air box to the pair valve that injects air into the exhaust ports
sounds like you have the crankcase breather blocked
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mark524
Expert Class
Posts: 297
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posted September 12, 2007 08:03 PM
where does the pair valve hose go into the airbox? the hose I have plugged goes into the airbox right above the spark plugs. I plugged it with the red plug included with my brock's pipe.
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BlackMagic14
Needs a job
Posts: 2058
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posted September 12, 2007 08:13 PM
Chip, I am assuming that is stock bore 13.5 CR pistons??? I hope if that is a 1417 it is making more power then that...
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mark524
Expert Class
Posts: 297
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posted September 13, 2007 09:04 AM
if you guys can think of anything that could possibly cause this, I will check it. Any help is greatly appreciated. There has to be a restriction or something. I'm at 100% duty cycle at 230hp and I'm reading about guys with turbo's making 300+hp with the stock fuel system.
I'm going to check the fuel pump as described in the manual. I highly doubt that's the problem with only 2200 miles on the bike.
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iflyems
Expert Class
Posts: 233
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posted September 13, 2007 12:12 PM
I'm making 400hp with stock injectors. I do have an aftermarket high pressure fuel pump though.
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chunter
Expert Class
Posts: 195
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posted September 13, 2007 12:51 PM
Lower compression pistons, stock bore, built for NOS not motor power...apples and oranges.
It'd make much more if I put MR9 or MRX01 into & and an oem tire. That 210 is on C16 with a Shinko tire.
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bayou boy
Expert Class
Posts: 147
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posted September 14, 2007 04:24 AM
i got same excact thing , port&pol heads, cams, tit valves, falicon rods,pistons- 210-215 on motor, with 65 shot, my compression is 13-5-1.
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chunter
Expert Class
Posts: 195
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posted September 14, 2007 04:49 AM
stock cams here
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bayou boy
Expert Class
Posts: 147
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posted September 14, 2007 06:06 AM
ye i got webcams,
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Sticks_n_Stones
Needs a job
Posts: 3930
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posted September 14, 2007 09:38 AM
Sorry Mark they apparently are too busy stroking each other, I havent seen it but I'm familiar with air 'injection' systems. they simply add clean air to the exhaust dillute the emissions parts per million. look for a tube that goes from your airbox (should be after the filter, breather tube from crank plugs in to airbox before the filter) to your exhaust, might be a actual air pump hooked up inline, not sure, but it has too hook up to your exhaust by your oil pan. just back track it. the plug that damn thing with the Brock red plug. good luck
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chunter
Expert Class
Posts: 195
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posted September 15, 2007 10:16 AM
Air valve is located on the top front of the valve cover (some call it the pair valve). Hose from it to the air box runs on the right side (throttle side) of the underside of the air box.
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mark524
Expert Class
Posts: 297
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posted September 15, 2007 12:56 PM
I've got that hose plugged. I think maybe the dyno operators air/fuel sniffer was not working right. Going to a different dyno this week.
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