2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

After Market injectors

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Old Mar 3, 2008 | 02:12 PM
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After Market injectors

Curious to see what kind and size of aftermarket injectors the turbo guys run, and how much of a market there is..
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Old Mar 3, 2008 | 02:22 PM
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it all depends on the rest of your set up...i run 720/1600 on my 87 and 550/1600 on my 90
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Old Mar 3, 2008 | 02:56 PM
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Common stock sizes are the GSL-SE's 680CC.

Then you get to aftermarket. Anything 720CC and above with common values being 720CC, 850CC, 1000CC, 1680CC. Sometimes a bit larger.
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Old Mar 3, 2008 | 03:39 PM
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I run 750/1600
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Old Mar 3, 2008 | 04:25 PM
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720/1680
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Old Mar 3, 2008 | 04:26 PM
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720/1000 to go with mod list in my sig.
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Old Mar 3, 2008 | 04:45 PM
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Originally Posted by Aaron Cake
Common stock sizes are the GSL-SE's 680CC.

Then you get to aftermarket. Anything 720CC and above with common values being 720CC, 850CC, 1000CC, 1680CC. Sometimes a bit larger.
Here's some nice to know/ fact about so-named "GSL-SE 680cc" injectors (courtesy of "renns")
"FSM says GSL-SE injectors flow 173 cc/15 seconds at 39.7 psi, or 692 cc/min. Multiply this flow by sqrt(43.5/39.7) to get nominal flow at standard 43.5 psi(3 bar) test fuel pressure = 724 cc/min."

I've seen enough posts confirming these things flowing more then 700cc's @ 3 bar. Actually if you look at witch hunter performance's website ,they have higher flow rates listed for these denso"195500 0900" then the blue top "greddy 720's" i.e. denso "195500 0830".
So it's kind of funny reading post's of people that don't want to use the so-called 680's over the 720's.
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Old Mar 3, 2008 | 05:24 PM
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Originally Posted by The Griffin
Here's some nice to know/ fact about so-named "GSL-SE 680cc" injectors (courtesy of "renns")
"FSM says GSL-SE injectors flow 173 cc/15 seconds at 39.7 psi, or 692 cc/min. Multiply this flow by sqrt(43.5/39.7) to get nominal flow at standard 43.5 psi(3 bar) test fuel pressure = 724 cc/min."

I've seen enough posts confirming these things flowing more then 700cc's @ 3 bar. Actually if you look at witch hunter performance's website ,they have higher flow rates listed for these denso"195500 0900" then the blue top "greddy 720's" i.e. denso "195500 0830".
So it's kind of funny reading post's of people that don't want to use the so-called 680's over the 720's.
is there a big market for bigger injectors in FC's?
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Old Mar 3, 2008 | 05:45 PM
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550/850cc moderatly modified
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Old Mar 3, 2008 | 07:05 PM
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Originally Posted by AnarchyFC
is there a big market for bigger injectors in FC's?
Anyone who is upgrading turbos or upping boost will need to upgrade injectors.

But if you are considering selling them, there are already a million sources.
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Old Mar 3, 2008 | 07:13 PM
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Originally Posted by Aaron Cake
Anyone who is upgrading turbos or upping boost will need to upgrade injectors.

But if you are considering selling them, there are already a million sources.
Thats what i was wanting to know.. we will probably offer them anyway.. guess ill have to find what other companies are charging
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Old Mar 3, 2008 | 08:08 PM
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From: dallas
what other kinds of Mazda injectors will fit on a 13B? im just looking to increase the flow of fuel.
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Old Mar 4, 2008 | 09:09 AM
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Nothing Mazda used is larger then what is used in the RX-7s. The biggest injector Mazda put on an RX-7 are the secondaries in an FD; 850CC.

The RX-7s use HUGE injectors for an OEM application. There aren't really any other OEM injectors that you can swap for higher fuel flow besides the 1680CC natural gas injectors used in some Fords.

Also, based on your signature your car is an NA anyway, so you don't need more fuel.
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Old Mar 4, 2008 | 10:14 AM
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right on - thanks for the info. this is the first rotary i've ever owned and dealt with, so i'm still learning about it.
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Old Dec 20, 2008 | 12:14 PM
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im running 550/720 in my t2 with these current mods

stock turbo @ 10lbs with manual boost controller
stock tmic
3 inch turbo back
fcd
walbro pump
rc eng. 550s
greddy denso 720s
safc

i upped the boost on my car from the stock 6-7lbs so i needed the extra fuel safety cushion...but im putting out 230hp and 201tq. @ 5k rpm before my stock clutch slips...lol
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Old Dec 20, 2008 | 05:29 PM
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http://www.racetronix.com/3145FM.html
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Old Dec 21, 2008 | 11:00 AM
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Originally Posted by The Griffin
Here's some nice to know/ fact about so-named "GSL-SE 680cc" injectors (courtesy of "renns")
"FSM says GSL-SE injectors flow 173 cc/15 seconds at 39.7 psi, or 692 cc/min. Multiply this flow by sqrt(43.5/39.7) to get nominal flow at standard 43.5 psi(3 bar) test fuel pressure = 724 cc/min."

I've seen enough posts confirming these things flowing more then 700cc's @ 3 bar. Actually if you look at witch hunter performance's website ,they have higher flow rates listed for these denso"195500 0900" then the blue top "greddy 720's" i.e. denso "195500 0830".
So it's kind of funny reading post's of people that don't want to use the so-called 680's over the 720's.
This summer I had a set tested at 3 bar. I think the flow numbers were close to 1000CC. Based on how much fuel I had to cut out of the map compared to stock 550s, I'd say that calling these injectors "800CC" is probably most accurate.
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