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Author Topic: f recommended injector size  (Read 18110 times)

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f85gtron

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Re: f recommended injector size
« Reply #15 on: May 22, 2014, 06:50:37 pm »
Wow!  I'm glad i asked!  I thought i might be lucky to gain 10 hp tweaking. I can get Ford mustang 17# injectors for next to nothing.  I think they fit, but not sure if they're pintle type?  I'll check the web site to calculate again...
Ron
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f85gtron

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Re: f recommended injector size
« Reply #16 on: May 22, 2014, 06:58:46 pm »
Ok.  The website shows 16.66666. Sooooooo 17# it is. I'd rather be a little rich than lean.  Ron
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Fierofool

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Re: f recommended injector size
« Reply #17 on: May 22, 2014, 08:04:49 pm »
I used Mustang 302 injectors which are rated at 19# in the first 3.4 I was involved with.  They ran rich.  Not as rich as the second engine that had Rochester 17# Multecs, but non-the-less they ran rich.  Only about 20 mpg on a crate 3.4 with a 4 speed.  If they are rating the injectors at 17#, make sure that it's at 43.5 psi.
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f85gtron

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Re: f recommended injector size
« Reply #18 on: May 23, 2014, 01:21:14 am »
Ok
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f85gtron

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Re: f recommended injector size
« Reply #19 on: May 23, 2014, 06:58:57 pm »
I called fic. Talked to a guy named sean?  I explained what i was doing and he advised me to stay with the factor . 15# injectors and have them cleaned/blueprinted. He said if i went 17#, i would get into flashing the computer to reduce the duty cycle if the injectors. Turn around should be a couple days.
Ron
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f85gtron

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Re: f recommended injector size
« Reply #20 on: May 28, 2014, 02:51:39 pm »
Ok. I sent off the injectors to fic. I'm hoping they're clogged and I'll see a huge improvement!  I was EXTREMELY tempted to buy a set of 4 hole Bosch "upgrade" injectors, but i think those may be disc type, so i didn't chance it. Please tell me i did the right thing!
Ron
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Fierofool

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Re: f recommended injector size
« Reply #21 on: May 28, 2014, 04:18:45 pm »
What kind of HP do you think you will be generating?  Plug that number into the FIC injector calculator.  With a good set of 15# injectors that are matched flow, you will probably be just fine.  You would need a gain of 20 hp before having to go to 17# injectors. 
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f85gtron

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Re: f recommended injector size
« Reply #22 on: May 28, 2014, 04:44:07 pm »
On the advice of the guy at fic, I'm sticking with the stock 15# injectors. The ones i was tempted to buy are the Bosch type 2 fat body for 2.8 6000,celebrity, fiero.....and so on....
I explained about opening the exhausts and new rocker ratios, but he said stick with what i have.
If i run into a lean condition, i can always upgrade anyways.
Ron
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Fierofool

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Re: f recommended injector size
« Reply #23 on: May 28, 2014, 04:55:01 pm »
...and you could probably sell a good rebuilt set very easily and recover your cost. 
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f85gtron

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Re: f recommended injector size
« Reply #24 on: May 28, 2014, 05:43:19 pm »
I was thinking the same thing. He (the guy at fic) said the 15# injectors are not being made anymore. I thought that didn't sound right, but they do seem to be scarce, so if that's the case, i have at least one egg in the basket. 
Ron
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f85gtron

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Re: f recommended injector size
« Reply #25 on: May 28, 2014, 07:34:19 pm »
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TopNotch

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Re: f recommended injector size
« Reply #26 on: May 28, 2014, 09:10:01 pm »
Quote from: f85gtron on May 28, 2014, 07:34:19 pm
This is the listing I was looking at:
http://pages.ebay.com/motors/link/?nav=item.view&id=191175161885&alt=web
Ron

Those are disk-type injectors. The Fiero ECM doesn't like them.
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Fierofool

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Re: f recommended injector size
« Reply #27 on: May 28, 2014, 09:12:45 pm »
I see in the description that they are Multec.  They'll probably be rated at 17#/hr.  Like Topnotch said.....
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There are three kinds of men:

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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

Raydar

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Re: f recommended injector size
« Reply #28 on: May 29, 2014, 01:55:18 am »
Quote from: f85gtron on May 28, 2014, 04:44:07 pm
On the advice of the guy at fic, I'm sticking with the stock 15# injectors.
...

For the mods that you are doing, those should be fine.
There is a good amount of "headroom" built into those injectors, and the stock program. As long as it's going to remain a 2.8.
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f85gtron

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Re: f recommended injector size
« Reply #29 on: May 30, 2014, 01:41:17 am »
2.8 all the way....until it dies.  ???
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85 GT manual NOW powered by 7730
3.4 bored to 3.5, cammed out and DIS'd
F23 connecting power to ground
My wife won't ride in it. It's "the other woman" ;)
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