New Fuel Injectors
Thread Starter
Intermediate
Joined: Nov 2008
Posts: 47
Likes: 0
From: Spring Texas
New Fuel Injectors
Just ordered new fuel injectors from Fuel Injector Connection for my 90 TPI. Any tips to make this swap easier would be welcomed. Also is it true that removing and plugging the vacumn lines from the fuel pressure regulator will raise the fuel pressure. THANKS Don
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
In other word if you have a 3 bar regulator non adjustable the vac line will take away pressure at low end because the injectors are pulsing at idle speed. as you increase rpm the injectors supply more fuel so the pressure goes up to accomodate.. you won't get 46 out of a 43.5 reg. why do you want more pressure anyway?
Last edited by FICINJECTORS; Dec 24, 2008 at 05:31 PM.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
the only problem with that Don is that you will actually use more fuel at low end than you need.. these newer tech injectors have optimum spray pattern at 39 psi.. 40 should be your idle rail pressure, so I would leave it alone at first, then record your performance, fuel mileage etc.. then try it disconected and see if there is any difference.. i bet your MPG goes down..
Pro
Joined: Dec 2008
Posts: 658
Likes: 0
From: Lubbock for now, headed for Oklahoma
Well if you add more fuel through pressure, then the ECM is going to see this at the oxygen sensors and just shorten the injector pulse width. It will get you nothing at all except a slightly warmer fuel pump
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
true, but, only in closed loop. while the engine is in open loop it will be using a little more fuel than it needs.
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