Fuel Injectors (Page 3/3)
fierofool APR 19, 05:41 PM

quote
Originally posted by Modesto:

Didn't the 3.4s use 17lb injectors? Is everyone doing fine with the 15lb? I've got my 3.4 short block being inspected before I install it and I've been wondering about this...



The injectors for my 3.4 are rated at 17# which actually flow 16.76 at 43.5 psi, stock Fiero fuel pressure.

Bosch EV1 Fuel Injector
Jetronic port / 4 hole nozzle

Flow rates @ 43.5 psi / 3 bar
16.76 lb per hour (My Note: 17# rated injectors flow at approximately 16.666 lb/hr at 3 bar or 43.5 psi. See calculator chart below)
126.5 G per min. (N-Heptane)
176.1 cc per min

15.90 Ohm resistance

Bosch Part # 0280150415
BMW part # 13641730060

CHART FROM MOTOR MAN FUEL INJECTOR SUPPLY

Fuel Injector Size Calculator
Horsepower (at the flywheel) 160
Number of Injectors 6
B.S.F.C. *

Max Duty Cycle in % 80


Required Injector Static Flow Rate @ 43.5 psi lb/hr 16.666
Modesto APR 19, 08:35 PM
Beautiful! 17s it is then.
Patrick APR 19, 10:00 PM

quote
Originally posted by fierofool:

I would suggest you take jjd2296's set, have them refurbished and flow matched. Injector Planet, Motorman Injectors or Injector Connection can do it for you and if there's an unrepairale problem with any of them, they can recommend the equivalent replacement set.




I went with rebuilt injectors from Precision Auto Injectors... although keep in mind, this was five years ago.


quote
Originally posted by Patrick:

I just ordered a set of these fuel injectors for my Formula - total price (with discount and including shipping to WA)... $77.20 Not too shabby. And no cores are required to be returned.


[This message has been edited by Patrick (edited 04-19-2020).]

Monkeybean007 APR 20, 02:06 AM

quote
Originally posted by Patrick:





Well if you click on that link they want 1000 bucks for them so probs not lol
Patrick APR 20, 03:43 AM

I believe that's their way of saying that they no longer have them in stock.
Modesto MAY 10, 02:38 PM
So I ended up with a set of the recommended Bosch EV1 injectors. The number on the ones I removed from my motor is 5235210. Just to make 1000% sure, this means I'm going from pintle to pintle and not disk to pintle, correct? I've been reading too many threads again and some people are saying some '88s came with disk style, but I can't imagine that would be the case.
fierofool MAY 11, 06:39 PM
There have been some reports of disc injectors in the 88's but there was some speculation that they were only in the last of the production run. What you have are pintle. You can verify it by looking into the business end. Should be only 1 hole. The EV1's you purchased are a 4 pintle injector so you will see 4 tiny holes in the spray nozzle.

5325210 was used in Pontiac Firebird 2.8L V6 1985-1986-1987-1988-1989 . They would probably be 15# injectors unless the Firebird ran a fuel pressure higher than 43.5 psi. It was also listed for the 85-88 2.8 Fiero and at 43.5 psi, should provide 15#/hr. In actuality, it's 14.65#/hr.

When you push the HP up from 140 in the 2.8 to 160 in the 3.4, the required flow is 17# which is actually 16.66#/hr so you see you need an extra 2 #/hr for the bigger engine. The EV1 you purchased flow 16.7#hr at an 80% duty cycle. Resistance is the same as the 5325210 injectors at 5.90 Ohm.

.
There are three kinds of men:

1. The ones that learn by reading.
2. The few who learn by observation.
3. The rest of them have to pee on the electric fence and find out for themselves. Will Rogers

[This message has been edited by fierofool (edited 05-11-2020).]

Modesto MAY 11, 10:00 PM
Awesome. Thanks for the info!