Changing my fuel injectors

[mowales81]

Hi guys it\'s been while not join the forum but I decide to change my sec injectors from 850cc to 1600cc so I just need some advice how to do that and what exactly parts I need to do that please and also can I drive the car after to go just remap it or not?

Thanks

Mo

[wolfie1]

you will need a fuel pressure regulator, fuel rail and all the fitting to go along with it and the car wont rev past 4000 rpm till its mapped and set up right

[m1tch]

Do you mean 1600s or 1680s? You will also need some injector spacers and to remove the injector diffusers in the LIM - I had to with my KG rail, although other rails might not need them to be removed.

[mowales81]

Yes I meant 1680cc and there is blitz fuel rail with pair injectors I think they bosch at good price are they good brand to put on car?also what is the best read or a good healthy read for the compression test please because I don\'t know?
Mo.

[m1tch]

I have a set of Bosch 1680s in my FC, they are the \'standard\' large injectors to fit to a rotary.

With regards to compression tests, making sure all rotor faces are even is the important part but here are what is good/not good with compression readings (using the correct rotary compression tester)

8 = very very good, fresh engine
7 = very good compression
6 = good used engine condition
5 = ok, but think about rebuilding soon

My FC is at 89k miles, compressions are 7.2 on the front rotor, 6.9s on the rear, all even, usually the rear rotor\'s compression will go first as its got less cooling for it.

Check out Mazda rotary parts for fueling upgrades

[mowales81]

Thanks for the reply but I\'m thinking to buy 2000cc injectors to add more power hopefully because my car has 850cc all round ATM runs 400ps 0.8 bar so my goal is 450 ps with new injectors I don\'t know if it\'s goons work or not?

[m1tch]

Thanks for the reply but I\'m thinking to buy 2000cc injectors to add more power hopefully because my car has 850cc all round ATM runs 400ps 0.8 bar so my goal is 450 ps with new injectors I don\'t know if it\'s goons work or not?

I got the 1680 secondary injectors to fuel for 650bhp, I think 2000cc injectors are a bit too large for only 450bhp, have you thought about maybe simply adding 2 extra injectors into the intake instead of going larger? A 13B engine can take around 800bhp if pushed.

Also factor in the upgraded fuel pump as well - I am guessing you are already running an upgraded fuel pump anyway, what did you go with?

[mowales81]

Ok and how much u selling for and what brand they are ,new or used ?and I use high capacity sard fuel pump,also do u have the rails and all stuff comes with it?

Cheers

[m1tch]

Mine aren\'t for sale, im sure there are some up for sale somewhere, what turbo do you have?

[mowales81]

Aw right sorry,I run s300 Borg warner and racing street port engine not sure how much power I can posh but my goal is 450ps is that possible if I change the injectors like u said or I need more mods?cheers

[Ed_RX7]

http://www.mazdarotaryclub.com/forums/showthread.php?t=74044

£260

http://www.mazdarotaryclub.com/forums/showthread.php?t=74737

£350

[m1tch]

Check out Ed\'s links above, the first kit has the \'indy blue\' Bosch 1680s, which are known for a better spray pattern than my Bosch 1680s, or his second link has the newer Bosch injectors but are much larger but I believe the controlability on them is top notch for such a big injector.

[mowales81]

Ok I do I have to buy aeromotive regular as well to get better result or it\'s fine without it?also is possible to change the fuel line and put braided hose instead I mean the whole fuel line?cheers

[m1tch]

Have a read of this on FC3S pro, its what I have done with my fuel setup:

http://fc3spro.com/TECH/MODS/FUEL/fsystem.htm

[mowales81]

Thanks but it said for fc not fd or it\'s the same system?