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

will the 720cc injectors of the older FC fit my primary fuel rail???

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Old Nov 24, 2006 | 12:04 PM
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will the 720cc injectors of the older FC fit my primary fuel rail???

guys ißm looking for a pair of 720cc primaries for my '91 S5 TII! will the ones off the older RX-7's (think they are '84) fit my primary fuel rail??

heeeelp!
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Old Nov 24, 2006 | 12:09 PM
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Those would be 680's and the impedance is wrong. But they will fit.
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Old Nov 24, 2006 | 12:11 PM
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http://cgi.ebay.com/ebaymotors/720cc...spagenameZWDVW

+ a pair of 10W 10 OHM resistors from radio shack
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Old Nov 24, 2006 | 12:13 PM
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but the guy selling them says a pair of 720cc injectors! aren't they off the old n/a's?
... or is he wrong?
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Old Nov 24, 2006 | 12:15 PM
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lol why would an n/a have biger injectors than a turbo car... think about that one...
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Old Nov 24, 2006 | 12:15 PM
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nope
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Old Nov 24, 2006 | 12:21 PM
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Originally Posted by junito1
lol why would an n/a have biger injectors than a turbo car... think about that one...
maybe 'cause he only has two injectors (like 13b FB's) compared to the four of the turbo... think about that!
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Old Nov 24, 2006 | 12:23 PM
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maybe 'cause he only has two injectors (like 13b FB's) compared to the four of the turbo... think about that!
WHAT!?
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Old Nov 24, 2006 | 12:27 PM
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Originally Posted by jm85rx7
http://cgi.ebay.com/ebaymotors/720cc...spagenameZWDVW

+ a pair of 10W 10 OHM resistors from radio shack
that's them ...


ok so if the guys right, from what model 7 are they of?? weird...
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Old Nov 24, 2006 | 12:29 PM
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those on the ebay auction are not from a 7 they are aftermarket injectors that can be used on a 7
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Old Nov 24, 2006 | 12:33 PM
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Originally Posted by jm85rx7
those on the ebay auction are not from a 7 they are aftermarket injectors that can be used on a 7
they look as if they have been on a 7 for 20years though...
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Old Nov 24, 2006 | 12:34 PM
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I have the same ones on my car and they look the same as those and they work fine just have them cleaned before you put them on.
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Old Nov 24, 2006 | 12:39 PM
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cool! do you know what make they could be? hope not venom... :/
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Old Nov 24, 2006 | 12:41 PM
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Greddy/ denzo its been a while since i had them its one of them but there not Venom
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Old Nov 24, 2006 | 12:45 PM
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sounds good! i'll try to get them... thanks man!
hope the connector plug is the same...
think the had different ones s4 through s5!
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Old Nov 24, 2006 | 12:45 PM
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If you have an S5 and you get those injectors you will need resistors to go along with them because they are Low Imp and the S5 has High Imp injectors
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Old Nov 24, 2006 | 12:46 PM
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got that, thanks
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Old Nov 24, 2006 | 12:46 PM
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I have my eyes on those too
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Old Nov 24, 2006 | 12:52 PM
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thoes are greddy/denso, low impedance injectors. they will fit your fuel rail with no modification but you might need thoes resistors. are you sure you're talking about the primary injectors? what size secondaries are you running?
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Old Nov 24, 2006 | 02:55 PM
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whats wrong with the vemons? I bought 4x1000cc made by venom. I have not installed them yet but, it looks like those venom ones are upgraded denso's. Cause the ones i have say denso liek the stockers. look like the stockers...
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Old Nov 24, 2006 | 05:08 PM
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Originally Posted by 87 t-66
thoes are greddy/denso, low impedance injectors. they will fit your fuel rail with no modification but you might need thoes resistors. are you sure you're talking about the primary injectors? what size secondaries are you running?

yes looking for the slightly bigger primaries, 'cause my hybrid (bnr II) is going to boost before 3500rpm, and i don't want it to go lean! i'm going for 1000cc secondaries!
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Old Nov 24, 2006 | 05:10 PM
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Originally Posted by junito1
whats wrong with the vemons? I bought 4x1000cc made by venom. I have not installed them yet but, it looks like those venom ones are upgraded denso's. Cause the ones i have say denso liek the stockers. look like the stockers...
just haven't heard enough good reviews about them, some say they are crap, others say they did well...

besides, the look of an injector doesn't tell you that it works properly, right!
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Old Nov 24, 2006 | 05:12 PM
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If you want slightly bigger primaries you can also use the 680cc injectors from the GSLSE Fb
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Old Nov 24, 2006 | 07:14 PM
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Originally Posted by junito1
whats wrong with the vemons? I bought 4x1000cc made by venom. I have not installed them yet but, it looks like those venom ones are upgraded denso's. Cause the ones i have say denso liek the stockers. look like the stockers...
thats because they are the stockers! just more flow
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Old Nov 24, 2006 | 10:42 PM
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The 12aT motor used two 720cc injectors FYI.
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