TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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How much psi can i run before injector seal failure or driver failure. Looking at other post I think some one said they where tested to 70 psi, but for how long? How well will my 15 year old drivers hold up to that kinda abuse?
__________________ 91 Firebird, 40 over 350, 190cc 64 cc aluminum heads, LT4 Hot cam kit, Vitor Jr intake, 454 TBI, Vafpr, 80pph injectors, Hooker 1 3/4 long tubes, T-56 swap, 4.10 gears, ASCD 97 ram air hood, air pump delete, 17x8.5 ARR Lemans rims with 255 40 17's.
From an email message from Walt Sherwin dated 8/25/03:
"17084304 is the stock (1990 - 1993 454) SS injector. The service part number is 17112560. It is rated at 75 lbs/hr of spec fuel, at 10.5 psig differential pressure. There was once a larger flowing injector manufactured and used in the early 80's, and in fact I have one that I've tested on the bench. The engraved number on top is RPD 17111784. It flowed around 80 lbs/hr, versus the 17084304, under the same conditions. However, you want to stay as far away as possible from those as the electromagnetics were terrible, they were quite sluggish, and beyond about 18psig they don't flow properly. There were larger alcohol injectors made for the Brazil market, but the last time I checked they were no longer available. Bottom line, stay with the 17084304 and crank the pressure until you get the delivery you need. I've run those puppies at 70+ psig fuel pressure !!!"
