ghetto way to bump fuel pressure - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 14 Old 05-30-2010, 07:23 PM Thread Starter
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ghetto way to bump fuel pressure

Before you try to copy this, you should have a good reason, and do so AT YOUR OWN RISK. If you fvck it up Im not responsible I all most ruined mine so be very careful!!!

So now that thats out of the way, my reason for deciding that I need more fuel pressure is because Im building a bigger motor with bigger cams ect ect. in order to keep duty cycle down you need either more fuel pressure or larger injectors. Last I checked injectors werent free, but this is.

What I did was crush the FPR (fuel pressure regulator) in a vice. this is just like shimming the spring internally making the FPR open at a higher pressure. my most accurate pressure gauge in the range required was on my air pig. I put a few fittings, and an on off valve together and connected that to the fuel rail on the pressure side then turned it on. sure enough air stopped flowing out the FPR at just over 40 psi(stock is supposed to be 41). now the tricky part. take the fpr off and find a way to crush it without damaging it. i cut a piece of pipe to fit, and used a socket to do the crushing part



my goal, 60 psi. but if i go over, up to about 70 is fine from what I have been told/read. (Wolf Racing from Australia and Bear Racing from S Africa).

the first crush showed 48 psi when i put it all back together. this was good, but not as high as I wanted

the second crush looked like this, and THIS IS TOO FAR.

125psi and it wouldnt open. this is why you must be very careful!

I got really lucky and was able to pull it back out a tiny bit with a set of small vise grips. its not pretty, but it will work, and now I have 64psi



this should make the stock 330cc injectors flow like a set of 412cc injectors at normal pressure.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 249.5 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #2 of 14 Old 05-30-2010, 07:55 PM
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I did this on my old hyundai. It was still slow but it would burn tires on the 1st to second shift after i did it. This a creative (and old-school) trick that usually works great.

2000 zx12 turbo, goofy redneck perched on top
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post #3 of 14 Old 01-17-2011, 01:17 PM
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B&M makes a kit #46057 you can use...You cut off 1/4" of the top of the reg. then you use this kit that goes over the top of your stock one and converts it to an adjustable regulator....Looks like it would work....I used it on my Integra FPR for Nitrous use....
B&M CommandFlo #46057 FPR....$56.

Last edited by holeshot; 01-17-2011 at 01:20 PM.
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post #4 of 14 Old 01-17-2011, 01:27 PM
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KZScott,


Fair play to you, 'what needs must'



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post #5 of 14 Old 01-17-2011, 02:51 PM
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surprised you dont have a remote fpr and an fittings
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post #6 of 14 Old 01-17-2011, 03:22 PM
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haha love it. nice trick Scott, and thanks for sharing
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post #7 of 14 Old 01-17-2011, 06:11 PM
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You are right Scott,Ghetto as fuck.....lol...But I guess it works for you huh....Good luck with it....
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post #8 of 14 Old 01-17-2011, 07:46 PM
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Quote:
Originally Posted by holeshot View Post
B&M makes a kit #46057 you can use...You cut off 1/4" of the top of the reg. then you use this kit that goes over the top of your stock one and converts it to an adjustable regulator....Looks like it would work....I used it on my Integra FPR for Nitrous use....
B&M CommandFlo #46057 FPR....$56.
Do you got a website????

Also do you have to pull the motor to get to the regulator or can it be obtined with the motor still on the bike?
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post #9 of 14 Old 01-18-2011, 06:14 AM
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Do you got a website????

Also do you have to pull the motor to get to the regulator or can it be obtined with the motor still on the bike?
I just googled it. B&M Commandoflo #46057...But I got mine at Discount Auto.....Very popular item and takes about 20 min`s to install.....
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post #10 of 14 Old 01-18-2011, 10:13 AM
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I just googled it. B&M Commandoflo #46057...But I got mine at Discount Auto.....Very popular item and takes about 20 min`s to install.....
Cool Thanks
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post #11 of 14 Old 01-18-2011, 11:12 AM
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Hey Scott are you logging how the changes affect performance? I am curious...

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post #12 of 14 Old 01-21-2011, 11:26 AM
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I did the same thing to my fpr but only up it to 48psi mine was 40psi stock.
I had to take 30%to40% out of my map in the low end a mid rage. The only reason i upped my fuel pressure was because of nitrous and some head work.
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post #13 of 14 Old 01-21-2011, 01:18 PM Thread Starter
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Quote:
Originally Posted by edge2edge View Post
Hey Scott are you logging how the changes affect performance? I am curious...
I did a lot of mods at the same time, head, cams , crank. and the logger wasnt really working well last season. i initially took out a lot of fuel down low and needed to add up top.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 249.5 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #14 of 14 Old 01-22-2011, 08:51 AM
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Thanks Scott!

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