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 Post subject: Injectors
PostPosted: Wed Aug 14, 2013 9:56 pm 
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Joined: Sat Aug 10, 2013 2:25 pm
Posts: 5
Location: Alberta
I have a 91 turbo and would like to know what injectors will fit from other cars. I am looking for 280 cc I believe, is there an interchange site anywhere?


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 Post subject: Re: Injectors
PostPosted: Thu Aug 15, 2013 9:45 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1175
Location: So Cal, USA
The OE fuel injectors (at least for MK1) are 210cc.

Any size high impedance injector should work, you just
have to make sure it's the same "style" in appearance so that it
matches up and fits in the head & fuel rail. The electrical
connector may be different on non-OE injectors,
so be sure to get the connectors if your replacements
look different. You can splice them on to the OE wiring
harness, polarity does not matter.

If you go with a larger injector you should install a wideband
A/F ratio gauge to aid in your injector selection if you are
going bigger or upping the boost. This will tell you if you are running rich
or lean, or tell you if your current injectors are up to par.

If you are just replacing OE, sometimes it's easier to have
your injectors cleaned and rebuilt.

The best way to get a quick lesson is to search for
injectors on Ebay, have one of your OE injectors in hand
so you know what it looks like. 15-20 minutes of browsing
the 1000's of listings, you will get a pretty good idea of
what to look for.


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 Post subject: Re: Injectors
PostPosted: Fri Aug 16, 2013 12:13 am 
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Joined: Sat Aug 10, 2013 2:25 pm
Posts: 5
Location: Alberta
Thanks for the info but I have been beating my head all over the internet trying to find anything that even looks the same for a firefly, let alone anything from something else that might fit. Is there a car that has a 270 - 280 cc injector that I can rob the injectors off of?


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 Post subject: Re: Injectors
PostPosted: Fri Aug 16, 2013 11:35 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1175
Location: So Cal, USA
You have the (3 or 4 injectors) port injection & fuel rail, correct?
Or do you have the single throttle body injector?

A pic would be great


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 Post subject: Re: Injectors
PostPosted: Fri Aug 16, 2013 7:43 pm 
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Joined: Sat Aug 10, 2013 2:25 pm
Posts: 5
Location: Alberta
3 cyl port injection & fuel rail.


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 Post subject: Re: Injectors
PostPosted: Sat Aug 17, 2013 12:06 am 
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Joined: Tue Feb 04, 2003 2:36 am
Posts: 885
Location: Vancouver BC
http://www.ebay.com.au/itm/CHEVROLET-SPRINT-MAZDA-MPV-FUEL-INJECTOR-NEW-89-98-/180946940974?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a2147342e

Some models of Mazda MPV V6's use same injector.


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 Post subject: Re: Injectors
PostPosted: Sat Aug 17, 2013 1:29 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1175
Location: So Cal, USA
Here is my MK1 injector showing top o-ring and insulator,
the lower seal is not shown on the injector.
This is an OE 210cc injector.

Attachment:
injector1.jpg
injector1.jpg [ 37.93 KIB | Viewed 2176 times ]


This side shows the guide placement that fits the OE
electrical clip.

Attachment:
injector2.jpg
injector2.jpg [ 39.88 KIB | Viewed 2176 times ]


These are some Five-O 380cc injectors that I had
ground down on the top to fit the fuel rail.
The flow rate was much to large to use,
even with the modified turbo and 15psi boost.
I would use these if I were closer to 200hp.

Attachment:
injectors380cc.jpg
injectors380cc.jpg [ 52.21 KIB | Viewed 2176 times ]


They also came with the clips which I retrofitted on
a spare wiring harness.

With my modifications, I started at 240cc, 270cc,
then 320cc which worked best to maintain the proper
A/F ratio @ 15psi.

If I remember correctly, there were some Mazda,
Mitsubishi & Toyota injectors. Using a wideband A/F
monitor, I was able determine which injectors worked
best under all conditions.

My search criteria was based on size, then I viewed all
active listings for the size and made my choice.
Try to go with a reputable seller & one that offers
clips as well. Some sellers even clean & recondition them
using ultrasonic methods. Be sure to choose a high impedance
injectors or you can fry the injector driver in the ECU.
You will find mostly used injectors, if they have not been
cleaned, you may want to have them serviced and flow
tested before installing. Expect to pay $50 - 100 for a decent
set, and you will likely only find quantities of 4 which will
leave you a spare.

Lastly, be sure you have new o-rings, upper insulators
& lower seals. Be sure to lubricate them when installing.
Power steering fluid (Esp. Honda) is ideal for lubricating
and conditioning the seals.

Attachment:
seals.jpg
seals.jpg [ 37.01 KIB | Viewed 2176 times ]


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 Post subject: Re: Injectors
PostPosted: Mon Aug 19, 2013 8:56 pm 
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Joined: Sat Aug 10, 2013 2:25 pm
Posts: 5
Location: Alberta
Great info, thanks. My Firefly came with a set of injectors from something else and I was trying to find a chart or some way to identify them. I have a set of the factory ones as well. I fired it up yesterday with the mystery injectors and it starts to crap out at 4000 rpm at 10 pounds boost. The exhaust is open right now as well, so I will button that up and try again. I think an A/F gauge is on my shopping list as well.
Thanks again.


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 Post subject: Re: Injectors
PostPosted: Wed Nov 13, 2013 8:26 pm 
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Joined: Thu Feb 22, 2007 10:51 pm
Posts: 153
Location: boise id
Just type the number off the side of the injector dirrectly into gpogle. It sgould bring up all the info on size and impeedence.


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