entropy
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posted May 28, 2006 12:26 AM
 Edited By: entropy on 28 May 2006 01:28
AF screwy
went to the track on Fri; mph WAY off but motor sounds fine.
The AF log was strange: after shifting 1-2, 2-3, 3-4, 4-5, AF was 12.75 (fine), but rose to 13.5 (not fine) at 11.4 shiftpoint.
I'm gonna replace the 4 YO Muzzy fuel pump; any other suggestions???
BTW: while I was struggling with lo 9's, Sleeperbusa aka BADZXELEVEN ran a 7.95@175 in his ole nitrous Vette!!!!!
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supra5677
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posted May 28, 2006 02:06 PM
perhaps it was the ram air?
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entropy
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posted May 28, 2006 02:38 PM
quote:
perhaps it was the ram air?
not too likely, i used to log MAP along with AF, and the motor doesn't lean out because of RAM air. It could be the MAP sensor tube is broken, bit then the bike would run like shit. I'll check all hoses, boots etc tomorrow.
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osti33
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posted May 28, 2006 06:29 PM
I agree. I would start with all the vacuum lines etc...
Then go from there. :shrug:
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osti33
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posted May 28, 2006 06:37 PM
7.95 @ 175!! DAMN! That vette is haulin.
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zrxdean
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posted May 28, 2006 09:58 PM
Can you log fuel pressure? Or borrow an O2 sensor?
7s in a car is impressive.
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entropy
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posted May 28, 2006 10:50 PM
Edited By: entropy on 29 May 2006 05:15
dropped the oil pan yesterday; not a fleck or chunk to be seen, zilch in the pickup screen. WOO HOO; motor has made 31 passes with cratering!!! 
Osti,
today i checked all vac lines, MAP sensor, boots for leaks; none apparent.
Dean,
I can't log fuel pressure, but i do have an extra O2 sensor.
I'm really thinking its the fuel pump, will install new Muzzy pump mid this week; when i pulled the current pump(Muzzy), some slimy shit came out of the pump; it didn't quickly evap like the gas which spilled out. hmmmmm... In line, in tank filter appears clear, and the bag filter on the pump intake doesn't appear clogged from the outside
BTW: checked cold cranking cc pressure: 305-315 all 4; that's were it ought to be.
BUT for some damn reason I was running NGK CR9EK's, NOT the PA's; wonder how that happened???
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VincentHill
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posted May 29, 2006 04:50 PM
You can Log the MAP by Hooking up the Vacuum to the Data Logger. Put a "T" In the vacuum line to the MAP Sensor and it will read it!
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entropy
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posted May 29, 2006 11:21 PM
quote:
You can Log the MAP by Hooking up the Vacuum to the Data Logger. Put a "T" In the vacuum line to the MAP Sensor and it will read it!
VH,
i have logged MAP; simply tap into the the 0-5V output of the mAP sensor, hook it to the logger input and walla
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psycho1122
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posted May 30, 2006 08:04 AM
entropy;
What Snorkel are you using??!!
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entropy
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posted May 30, 2006 11:42 PM
quote:
entropy;
What Snorkel are you using??!!
Hans.
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psycho1122
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posted May 31, 2006 05:03 AM
That's why the system leans out.
As you gain speed, the Hans shoves too much air into the system and the pressure drops.
Too much air?! Yes! The volume of air has to SLOW DOWN as it enters the airbox to gain Ram Pressure.
The ECU "see's" this and will lean out the engine.
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psycho1122
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posted May 31, 2006 05:07 AM
I would also do a Flow Rate test of the Muzzy Pump before replacement.
My Muzzy pump new flowed 240 ml in 3 seconds. The stocker flowed just over 100 ml in the same 3 seconds.
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NOX
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posted May 31, 2006 05:16 AM
Could this same effect happen with no air filters, just running the screens? On a stock motor?
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psycho1122
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posted May 31, 2006 05:38 AM
If you are asking about the Ram Air....Filters have nothing to do with Ram Pressure.
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entropy
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posted May 31, 2006 09:11 AM
quote:
That's why the system leans out.
As you gain speed, the Hans shoves too much air into the system and the pressure drops.
Too much air?! Yes! The volume of air has to SLOW DOWN as it enters the airbox to gain Ram Pressure.
The ECU "see's" this and will lean out the engine.
hey, anything is possible, but i have about 30 passes with the hans (an 5 or so with the OEM) snorkle and the AF is more or less flat 12.7-13.0-ish 8000 - 11400 or so
This flakyness just started happening last fri
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entropy
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posted May 31, 2006 09:15 AM
psycho,
I have been wondering about the pump for a couple years, figured i would just replace it. Already out of the tank; new one coming today.
I am wondering about the fuel pressure regulator also...
who knows anything about tunable fuel pressure regulators???
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ninja12
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posted May 31, 2006 10:58 AM
Dave O has a dry kit that uses the adjustable fuel pressure regulator.
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entropy
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posted May 31, 2006 12:08 PM
quote:
Dave O has a dry kit that uses the adjustable fuel pressure regulator.
Off this topic; let's hi-jack my own thread:
couldn't you just jack up the fuel pressure to lower the duty cycle of the injectors, rather than buying bigger injectors?
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ninja12
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posted May 31, 2006 02:22 PM
I only mentioned the dry kit because it uses an adjustable regulator.
Doug M wrote a detailed article about increasing fuel pressure and hp.
full report at : http://www.schnitzracing.com/technical_corner.htm
short answer :
To increase the fuel flow needed on the ZX-12 when raising the power from 165 to 200, would require an 8% increase in flow through the nozzles. If it were to be done with pressure alone, without changing the duty cycle, that would take an increase in pressure of 36%. On a stock system that would necessitate an increase of fuel pressure up to 61 psi., something the stock pump is clearly not up to. Again, the "bigger" pump will allow for more fuel to be pumped at a given pressure. Increase the duty cycle (orifice size) and the pump can "keep up".
The muzzy pump is designed to support 700 hp it would have to be worn very badly to not support 230 hp.
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ninja12
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posted May 31, 2006 02:24 PM
I'll bet you have a pinche fuel line.
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aliveagain
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posted May 31, 2006 06:25 PM
pinched line would show in the lower gears also,no?Entropy,is it only in 5th or 6th gear?Running out of fuel(in the tank) at the end of the track?
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ninja12
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posted June 01, 2006 08:28 AM
We'll see. 
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entropy
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posted June 01, 2006 09:33 AM
AA & G,
yep it was happening in all gears; could have been a pinched line, but new pump goes in tonight, will assure no pinched lines.
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01zx12r
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posted June 06, 2006 11:13 AM
Update?
So what happened? Did you find the problem?
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