Cowboy
Pro
Posts: 1061
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posted July 25, 2003 09:48 AM
Muzzy high pressure fuel pump
Anyone know how much % more fuel the Muzzy pump puts out over the stock 2000 pump?I have a good map and wonder if i could just minus 5%(or whatever it is)out of each block in the fuel table when i instal the pump?
  
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blink
Novice Class
Posts: 48
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posted July 25, 2003 11:30 AM
When I put the Muzzy pump in it was really bad from 9,000 to 11,600 running so rich I was loosing 10 hp in places. Ran like crap, your experience may be different, you might want to run it at night so you can make huge flames but it isn't anywhere close to a uniform minus 5 %. Ask Kevin if he can send you a map from John's bike.
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted July 25, 2003 12:04 PM
That doesn't make sense. The pressure regulator is downstream from the pump, so you would not see higher pressure or greater flow at the injector. The stock pump simply can't deliver enough fuel for 200+ horsepower. The muzzy pump can.
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Cowboy
Pro
Posts: 1061
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posted July 25, 2003 12:32 PM
 Edited By: Cowboy on 25 Jul 2003 13:34
Swft,ive heard numerous times that you had to get the bike remapped after installing the pump.Is this wrong info?Should do a dyno run and get a air fuel reading then install pump and repeat?
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blink
Novice Class
Posts: 48
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posted July 25, 2003 05:48 PM
Cowboy that is what I did but on different days. First I went and had some baseline runs then the next day installed the pump in the morning and went back to the same Dyno that afternoon. It was before there was a tuning link at that Dyno so it took more than 20 runs to get the map back to where it was. It wasn't to bad at lower revs but it would break up badly on top. I think it was more like -12 on top. At the time I had a 1270 kit so I don't know what effect different motor mods would have. I think I might have an old PCIIIr map with the pump adjustments but it would not be of much use to you if your motor's stock. It might not make any sense but I don't think I'm the only one that had to go through a re-map after installing the pump. Sometimes you don't always get the best advice from Muzzys but way back then they said I would probably have to re-map and in my case they were right. But on the other hand I am old and it was a long time ago and it is the way I remember it.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted July 25, 2003 08:05 PM
Clarification in order here. The pump is not a "high pressure" pump but a high flow pump. The system regulates the pressure via it's maximum flow capability and a small pressure regulator forming a "plug" in the system. The Muzzy pump has the ability to flow (in pounds per hour or gal per min- whatever measure you like) about 3 times what a stock pump will flow. With a stock pump it is "pumping all it can" at about 220 hp which is about 110 lbs./hr. That is, it just can't fill the injectors AND maintain the pressure required. The pressure will trail off regardless of what the system does to try and maintain it. Think of a bucket with a hole in it and a garden hose with the faucet wide open. With a small hole in the bucket (say a 200 hp hole) you can keep the bucket full. Make the hole bigger and the city can't supply enough water to keep the bucket full. You need to call and ask the water department for more FLOW. The Muzzy pump will keep the bucket full with a 600 hp hole in it. Your map shouldn't vary more than 5% or so unless your stock pump was really bad. Certainly nothing like you've described.
Lot's of pleased users out there.
Doug
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Cowboy
Pro
Posts: 1061
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posted July 25, 2003 08:36 PM
Thanks for the reply Doug.If my map should very some should it be the same amount at all tps and rpms?
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted July 26, 2003 08:10 AM
Cow,
No, it is not uncommon to have different needs at different spots (cells) in a properly constructed fuel map.
Doug
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kcadby
Pro
Posts: 1733
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posted July 26, 2003 10:17 AM
More to what Doug just said...The numbers go "all over the place" as rpm/TP changes...from -25 to +3 in 500rpm in some areas...(just an example)...
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Cowboy
Pro
Posts: 1061
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posted July 26, 2003 01:56 PM
So if i put this pump in I will have no choice but to have a custom map done again?
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted July 26, 2003 02:21 PM
Of course you have a choice. The effects on your bike may be minor or may be something you can live with, that don't bother you. MAybe you don't need to change the pump at all- What is your engine combination?
Doug
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Cowboy
Pro
Posts: 1061
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posted July 27, 2003 08:33 AM
engine has Stock bore forged MTC Pistons and spraying 60 hp dry.Its just the map thats in there now works real good but want to install the pump just to be safe when spraying.Was hoping it would affect each cell equally and i could just take a couple points away from each.Oh well,well see what happens.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted July 28, 2003 07:54 AM
You could probablly benefit slightly from the higher flow pump. The pistons don't increase the engine's need for fuel beyond what the PC can provide. But the "60 hp" dry shot could certainly benefit from it, if you can actually get it in there by greatly enrichening the the appropriate values in the PC (90-100% throttle above XXX rpm).
Doug
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Cowboy
Pro
Posts: 1061
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posted July 28, 2003 05:55 PM
Doug,I have already purchased the pump.Right now i'm using the Yosh ems with the map switch and on the nitrous map I've done just what you just said(bumped the values up by 15% from 6000 rpm and up at 80-100%throttle).
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