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Old 05-08-2010, 02:50 PM   #1
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Default fuel pressure regulator question

the car is a 1.7L originally a b6 i have bosch 1000cc injectors and a walbro 255 pump i just wanted to no if i would be needing a fuel presure regulator thanks for the help the ecu is a megasquirt pnp thanks guys
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Old 05-08-2010, 06:37 PM   #2
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Originally Posted by mtl_miata View Post
i just wanted to no if i would be needing a fuel presure regulator
yes if u have no fuel pressure regulator then ull have no fuel pressure hope this helps thanks buy
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Old 05-08-2010, 08:59 PM   #3
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no fuel pressure equals bad ok nobody runs with no fuel pressure because there wont be no force in the fuel and when the injectors they will open nothing will happen because the fuel will just sit there in the tank and if you have a pump stuff happens and then you will have to tell the megasquirt there is zero pressure and then it will run fine
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Old 05-09-2010, 10:25 AM   #4
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i just would simply like to no if its a good idea to get the m-tuned fuel rail and fuel presure regulator.
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Old 05-09-2010, 10:28 AM   #5
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i just would simply like to no why you don't have a fpr to begin with.
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Old 05-09-2010, 10:33 AM   #6
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He's asking whether he'll need an aftermarket FPR, not if he should remove one all together.

I have no idea what the limitations of the stock FPR are though.

Hopefully this helps you:
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Originally Posted by olderguy View Post
As I remember, the stock FPR will put out a maximum of 50psi fuel at -0- and will increase fuel pressure 1 psi for each pound of boost.
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Old 05-09-2010, 11:38 AM   #7
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Actually I think you mean an ADJUSTABLE FPR. And if the OP had bothered to read the FAQ he wouldn't be asking this question. But since I'm nice I'll do all the work for the OP and hold his hand... straight from the FAQ located here:
https://www.miataturbo.net/diy-turbo-discussion-14/diy-faq-all-your-answers-one-big-post-4288/

Quote:
You do not need to bother with increasing fuel pressure when running engine management. Since you are in full control, you simply need to add larger injectors (which you can now control) and utilize the stock fuel pressure regulator. The money saved on the FMU is money spent on injectors that can support your goals.

As for the m-tuned fuel rail, that is going to depend on how much power you are running... thanks for telling us that btw.

Last edited by FRT_Fun; 05-09-2010 at 12:23 PM.
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Old 05-09-2010, 12:43 PM   #8
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so this one tyme i was all like 'hey i have a questoin and all these guys were all bein jerks and they were sayin **** (its cool yu can swear in here) like go read the faq' and i jus told them to **** off an left
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Old 05-09-2010, 01:59 PM   #9
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thanks
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Old 05-09-2010, 02:07 PM   #10
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Seriously though OP... 1000cc injectors... wtf are your power goals?

Edit: NM found your thread..
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Old 05-09-2010, 04:20 PM   #11
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Heh.

Ok, in all seriousness, we've had our fun.

To the OP: Normally you won't need an additional fuel pressure regulator if you're running anything like a Megasquirt and have injectors which are properly sized for the application. Just let the stock FPR on the fuel rail do its job.

Now, it's been observed by some that the Walbro 255 is "too much" fuel pump for the stock FPR to accommodate. IOW, it flows so much fuel that the FPR can't bypass enough of it to maintain stock fuel pressure at low load conditions. However, this is typically only a concern when running the stock ECU as, again, ECUs like the MS can be trimmed to accommodate the additional pressure. Just stick a gauge on the fuel rail to make sure that the fuel pressure isn't ridiculously outrageous at idle (100 PSI is probably a bit much) and you should be fine.

And, for the love of Allah, try to use punctuation every now and then.
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Old 05-10-2010, 01:19 PM   #12
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Quote:
Originally Posted by Joe Perez View Post
Heh.

Ok, in all seriousness, we've had our fun.

To the OP: Normally you won't need an additional fuel pressure regulator if you're running anything like a Megasquirt and have injectors which are properly sized for the application. Just let the stock FPR on the fuel rail do its job.

Now, it's been observed by some that the Walbro 255 is "too much" fuel pump for the stock FPR to accommodate. IOW, it flows so much fuel that the FPR can't bypass enough of it to maintain stock fuel pressure at low load conditions. However, this is typically only a concern when running the stock ECU as, again, ECUs like the MS can be trimmed to accommodate the additional pressure. Just stick a gauge on the fuel rail to make sure that the fuel pressure isn't ridiculously outrageous at idle (100 PSI is probably a bit much) and you should be fine.

And, for the love of Allah, try to use punctuation every now and then.
thanks alot you answered my question in simple terms
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