entropy
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posted September 17, 2005 02:36 AM
 Edited By: entropy on 22 Sep 2005 09:03
Muzzy fuel pump: mine is fine :-)
OK,
put a guage on my fuel and it putting out 43psi while pump is running.
43psi is spec for OEM pump, but I understand that the Muzzy pump is supposed to put out 50psi???
Comments????
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VincentHill
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posted September 17, 2005 05:09 AM
Edited By: VincentHill on 22 Sep 2005 11:48
Something is wrong and I think you put it "IN LINE" to measure it. You need to put it plugged on the outlet side. Line to the gauge and on the outlet side a line with a plug in it! Then is should read correctly. Hooked in line the Regulator (Corrected by Mr. Muzzy) will control pump pressure in the line and on your gauge. The return valve controls outlet pressure from the injectors to the tank on the 00 & 01.
Yes, YCIS Has a Turbo
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entropy
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posted September 17, 2005 05:14 AM
i did put it in line, just like the manual says????
so the return valve will bleed off pressure until it reads 43???
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entropy
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posted September 17, 2005 05:43 AM
I went back and tested with the gauge outlet plugged and lo & behold got 60#.
Thx VH, I owe you one! 
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VincentHill
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posted September 17, 2005 12:32 PM
DId you expect less (After all of the fun and games I had with these!!) Let me know if you have shipped the Lock up? If not, then I will give you an account number for FedEx so I can get it in a few days.
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entropy
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posted September 17, 2005 01:39 PM
it went out 2 days ago; sent to yr work address. Wifey took it to Postnet, had 'em pack & ship. My guess is you'll get it on mon/tues.
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VincentHill
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posted September 17, 2005 07:00 PM
OK! I will let you know when received. If I had been thinking I would have given you my account # to begin with but I am not always sharp 
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Ra12r
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posted September 18, 2005 01:02 PM
Entropy did you just say that the bleed off won't let the pressure go above 43psi?
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entropy
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posted September 18, 2005 01:20 PM
W.
from the other thread:
(this is my understanding, and NOT to be taken as fact )
I think its about what max rate the pump can supply vs what max rate the motor is eating.
At low hp, with either the muzzy or the OEM pump, the rail pressure is easily maintained at 43psi to the injectors, dumping excess gas back to the tank via the regulator. With a Muzzy pump, it is just dumping at a higher rate.
At high hp (over 210-ish???), the injectors are spraying so much fuel that the OEM pump cannot maintain the 43psi in the rail. The Muzzy pump, putting out a higher pressure/higher flow rate, is capable of keeping the rail at 43psi
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ninja12
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posted September 18, 2005 10:42 PM
IF that's true why does the muzzy pump require a remap?
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entropy
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posted September 19, 2005 03:11 AM
On a "small motor" that's a good question;
on a big motor where you really need the Muzzy pump, here's my guess
the OEM pump isn't keeping the rail at 43 at hi rpm, thus you'd need high numbers in map (higher duty cycle) to get the flow you need to get the right AF
With a big motor you prob go to lower numbers in the map (wrt the OEM pump) cause the pressure of the rail is at 43 so the injectors are flowing more for a given duty cycle.
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VincentHill
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posted September 19, 2005 05:15 AM
Edited By: VincentHill on 19 Sep 2005 07:57
ENT, What you say is the same I thought in "Theory", but the reality was the bike ran lean with the Muzzy pump and a "LOT" of fuel had to be added! What I just said is true, but on the way to work, I amd thinking that maybe because I lowered the compression it needed more fuel?
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Ra12r
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posted September 21, 2005 06:21 AM
The current rational for the muzzy pump is to reduce the duty cycles of the injectors. However, changing the pressure release valve would do the same thing (ie: by increasing the fuel pressure just like the shim in the oil release valve). The maximal sustatinable PSI of the OEM would of course be a limiting factor.
I think YCIS or Psycho is using the OEM pump and spraying at around 250 HP..... This topic about the need of a different pump was addressed a couple of years ago. The end result seemed to lie with the duty cycles of the injectors required to keep the A/F in the correct range on a dyno. However, I believe the results were calculated mathmatically and not actually measured in real time. Thusly, the ability of 200+ HP running on OEM pumps. I do know the PC3 reads the duty cycles in real time, so with a computer it can probably be recorded. But, I have never seen anyone actually posting about that.
Psycho, ?? could you post about why you changed injectors on your turbo?
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your car is slow
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posted September 21, 2005 06:24 AM
Yeh...I was using the stock pump and managed 248hp on spray (dry shot) by maxxing out the values on the PC3R back when the 12 was a nitrous bike.
However on a side note....with the turbo and similar horsepower levels and the muzzy fuel pump...the injectors were indeed maxxed out according to the DTA software.
They were replaced with some 700cc RC injectors (however now the fuel rail doesnt clear the bottom of the airbox/frame and require some "adjustment")
The stock injectors are TINY....ridiculously tiny infact.
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robmuzzy
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posted September 22, 2005 06:57 AM
Fuel pressure is controled by the fuel pressure regulator. The MUZZY pump has increased fuel flow (more Lbs. per hour). By the way 700cc injectors would be good for about 550 hp. you must be running a turbo. If not your injectors are twice as big as they need to be. The tiny stock injectors are good up to 300hp. The stock fuel pump is good for 210hp.
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entropy
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posted September 22, 2005 08:04 AM
quote:
Fuel pressure is controled by the fuel pressure regulator. ...
Rob,
yep, that's what I learned.
I changed the thread title just for YOU!
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your car is slow
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Fuck Nitrous...Got Boost?
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posted September 22, 2005 08:46 PM
Edited By: your car is slow on 22 Sep 2005 21:47
quote:
Fuel pressure is controled by the fuel pressure regulator. The MUZZY pump has increased fuel flow (more Lbs. per hour). By the way 700cc injectors would be good for about 550 hp. you must be running a turbo. If not your injectors are twice as big as they need to be. The tiny stock injectors are good up to 300hp. The stock fuel pump is good for 210hp.
Why yes..it is a turbo 
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psycho1122
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posted September 27, 2005 07:13 AM
I do Run a Muzzy Pump on my 1270 (Cheap Insurance at over 14:1 CR)
I do not run a Turbo or NOS.
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