Best high-flow injectors for the Fiero V6? (Page 3/3)
Blacktree MAY 29, 02:41 PM

quote
Originally posted by La fiera: Right now I have enough injector for 380WHP


If that's not enough, then all I can say is... DAMN!
La fiera MAY 29, 07:34 PM

quote
Originally posted by Blacktree:

If that's not enough, then all I can say is... DAMN!



At this time I want to see how far I can push the 3.4. Can you imagine If it wants more injector!!!
Then I'll join you like:
pmbrunelle MAY 29, 10:09 PM

quote
Originally posted by Blacktree:
Side note: Not sure how some of these guys are getting away with such small injectors. Maybe they aren't revving their engines very high?



Every time I hit maximum duty cycle, it happened at the fastest speed I've turned the engine: 6300 RPM
La fiera MAY 29, 11:47 PM

quote
Originally posted by pmbrunelle:


Every time I hit maximum duty cycle, it happened at the fastest speed I've turned the engine: 6300 RPM



Yep, that means you ran out of of injectors my friend!

fierosound MAY 30, 10:15 PM

quote
Originally posted by pmbrunelle:

Same for fierosound; it seems strange to me that 21 lb/hr injectors are able to feed a supercharged 3.4 L.



Oops. I thought they were 21 lb'ers...

I know I was given new Rochester/GM injectors for the 3.4L DOHC V6 engine when I built my roller cam 3400 block, iron head hybrid.
When I added the S/C with 8lbs boost, the fuel tables were adjusted and there never appeared to be a fuel shortage.

Rochester/GM part number is 17090849 and is on Stan Weiss' list and appears to be a 30 lb injector.
From online searches it appears the 849 and 844 above it are interchangeable.

[This message has been edited by fierosound (edited 05-30-2020).]

pmbrunelle MAY 30, 10:57 PM

quote
Originally posted by fierosound:
I know I was given new Rochester/GM injectors for the 3.4L DOHC V6 engine when I built my roller cam 3400 block, iron head hybrid.
When I added the S/C with 8lbs boost, the fuel tables were adjusted and there never appeared to be a fuel shortage.

Rochester/GM part number is 17090849 and is on Stan Weiss' list and appears to be a 30 lb injector.
From online searches it appears the 849 and 844 above it are interchangeable.



Does that injector spray two plumes of fuel, one towards each intake valve of the DOHC?

With just one intake valve, I think I would prefer an injector that sprays a single plume of fuel.
fierosound MAY 30, 11:25 PM

quote
Originally posted by pmbrunelle:

Does that injector spray two plumes of fuel, one towards each intake valve of the DOHC?
With just one intake valve, I think I would prefer an injector that sprays a single plume of fuel.



After running this engine for 20 years, I JUST thought about that after I found the part number this past hour.
Never considered it before (if I knew THEN what I know NOW) and while NOT ideal, it has never presented a problem.

Clearly the shop that got them for me considered the flow, but overlooked spray pattern as well...




Now considering swapping to OEM 3800 S/C Bosch EV6 injectors - rated at 34 lb.
PN 0-280-155-868 - but spray pattern doesn't fan out much.

[This message has been edited by fierosound (edited 06-02-2020).]

jjd2296 JAN 01, 08:58 PM

quote
Originally posted by La fiera:



I use the EV6 with the EV1 connector and has better atomization than the EV1



any more details like a part number for the EV6 green injector??
pmbrunelle JAN 02, 01:00 PM
The green injector is known as the "Green Giant", or Bosch 0280155968.

This is how they look like installed in the Fiero V6:


These are my comments regarding these injectors from my project thread:


quote
Originally posted by pmbrunelle:
With La Fiera's injectors, I haven't noticed much different in how the engine runs hot, at the present boost level.

The biggest improvement was in cranking and starting the engine.

With the Accel injectors, I had a hard time to inject the correct amount of fuel when cranking. It was not easy to find the happy medium between flooding the engine, vs. firing up quickly.

With the Green Giant injectors, the tuning window was wider; I converged on a suitable cranking fuel quantity quickly. I suppose that they make a better quality mixture.


Link to source: https://www.fiero.nl/forum/...L/142133-6.html#p213