Could some one give me the part # from the ND 720cc injectors, the one thats written on the side of the injector. Im looking to get a set through a parts supplier real cheap but they need a part # the size and discription is not enough for them to find it. Also did these injectors ever come stock on any production car?

Thanks
Ryan W

 

I don't believe they came stock on any production car but the 84 to 85 GSL-SE RX-7 13B came with 680cc injectors. Many people argue that they are the same but the part #'s are differnt so are the colors of the injectors.

crispeed
87Rx-7 TII
9.20@150mph
2600lbs

 

I believe they are stock from a 1984-1985(?) 1st gen 12A Turbo J-spec.
These injectors are easily purchased from any GReddy dealer for about $130 each.



-Ted

 

1st gen 12A turbos came with a much bigger injector than 720cc's. I believe it was either 800 or 850cc's. They also have a different color and part# than the ones from GReddy and HKS.

crispeed
87 Rx-7 TII
9.20@150mph
2600lbs

 

Ive got a set of the 680s from a GSL-SE and would like to use them but im going to be using a haltech and the only maps I could find to get me started were for 550s or 720s from hitmans site. I still have my 550s but im scared that that might not be enough fuel for the mods I have and puting the 680s in and useing a map for 550s would make me run really rich to start off with right? Then I would have to mess with the map to take out fuel and I have know idea how to tune a fuel computer yet. So I figured I would be better off geting the larger injectors to start off with and using hitmans map to learn to tune on. Plus later on I would have the extra fuel to add more mods and retune the computer to match. What do you think I should do?

 

I run 12A turbo injectors on my car, they come with light green coloured tops, flow 720cc/min @ 40 psi fuel pressure on a test rig.

They come in dark blue coloured tops as well and these flow up to 850cc/min at the same pressure.

Cause these injectors are so old now (when off import) when you test em MANY will flow almost 1000cc/min as they have basically worn pintle's and seats. Recently I had tested over 12 of these injects to get 2 matched pairs, found BIG variations in actual flow rates.

So what ever you get make sure you test em on a bench before you put them in you're vehicle and select the pressure you want to run them at. I am turning up the pressure on mine so they run at 800+cc/min as they are not effected with the higher fuel pressures.

 

The Haltech has a function which you can change all the maps to a certain precentage all at the same time.&nbsp I believe it's Alt-R to select all ranges, and then Alt-P to enter a percentage.&nbsp This way you do a quick calculation from 550 up to 680 - I would adjust a little smaller than necessary to give you a slight margin for error on the rich side.



-Ted

 

I've got 2 brand new Greddy 720cc injectors still in the plastic that I need to get rid of. I was going to use them for my Rebic but changed the setup all around. If your interested then make me an offer.....remember they are "brand new".

Thanks

 

Thanks for the offer silvr94r2 but I think im going to stick with the 680s and just do what RETed said. By the way thanks for the info Ted.

 

I have found thru having had 4 GSL-SE's that after I had the injectors cleaned thru R/C Eng , the 84's came back in the 680 range, and the 85's were in the 720 range.
just a bit of info I've found along the way.