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Old 07-30-2010, 10:51 PM   #1
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Question Max Fuel pressure on stock injectors?

I think the stock injectors on the Zetec motors run about 2.7BAR / 39.5PSI

Is anyone having problems running slightly higher pressures like 3 or 3.2BAR?

I'm wanting to push a little more volume though a set of 30Lb injectors that are rated 30lbs @ 2.7BAR. Bosch PN# 0 280 156 095

Opinions?

FYI - Before everyone starts shouting that these are too small...... this is NOT for a FI build, but I know you guys have the most experience tinkering with this kind of stuff so I posted here.
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Old 07-31-2010, 10:59 AM   #2
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The way Inj are rated is by psi , If you take a set of 30lb and go from 40psi to 50psi then they basicly would make them a larger Inj , didnt do the math but in the 35-38 guessing

If you go on line and look there are calculators that will do the math , My opinion is as cheap as Inj ar buy some 39-42 Inj

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Old 07-31-2010, 12:28 PM   #3
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is it not safe to run a higher PSI on a stock injector? or any injector for that matter?
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Old 07-31-2010, 10:13 PM   #4
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Tom,

I'm not going FI, I just need about 32-34lb injectors.

These should work fine with about 42-45PSI.

I'll know for sure when I start the dyno work.
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213 whp / 160 wtq D23 NA with stock intake and TB.

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Old 07-31-2010, 10:21 PM   #5
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Quote:
Originally Posted by mlbbaseball View Post
is it not safe to run a higher PSI on a stock injector? or any injector for that matter?
I guess if you are running a significantly higher pressure it could be a problem.

Actually it looks like these injectors are designed to run 39-43PSI as they would have been used on a conventional fuel system with mechanical regulator and return.

I'll be using these in a Dtec with closed returnless and a variable output fuel pump. You can adjust the fuel pressure set point. While there are limitations, adjusting the pressure a little bit is not a problem.

The Dtec's are designed to run close to 50PSI, so I should be able to dial it back for these injectors with no problems. I'll probably start off with 43PSI.
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