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Microtech Choosing injectors. Help?

Old 09-29-09, 04:11 PM
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Choosing injectors. Help?

I have been letting my RX3 remain NA for too long. I want to run the turbo now. I still have the stock injectors in it so they will need upgrading. I would like to have good drivability since this is a street car.

What injectors would you recommend for the parts I have?

2 x Walbro 155s (Total flow capacity 45gph @ 50psi)
MicroTech LT-8 ECU
Cosmo 13B-RE (currently stock ports, but will soon street port likely w/ clipped '86 TII rotors)
Garrett TA0413 (Equivalent to a 60-1)
FMIC 24"x11"x3" (2.5" piping)
3" Exhaust (RB universal main and pre silencer)
Tial 46mm (10 psi spring) (more boost to come later, say 15psi)
TII coils w/ MSD 6AL on leading coil

Thanks
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Old 09-29-09, 05:03 PM
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We sell 1200cc injectors go straight into the factory fuel rails. They have an excellent spray pattern. They are bosch injectors. I have tuned cars with them that idle as low as 800rpm so they work very well.
And with 4 of them you are good for 550rwhp. If you are interested. PM me and i can give you pricing.
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Old 09-29-09, 05:06 PM
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My fuel pumps limit me to about 450 flywheel hp and I am OK with that limitation. I just finished playing around with kgparts' fuel injector calculator a bit...

Stock 550cc injectors calculate to being good for about 140hp. The additional 310hp equates to 1220cc secondaries. I know that there is usually some art to connect theory to practice. With no experience my guess is to 1200 or 1300cc injectors with the same resistance as the primary injectors (Don't know that value yet though)

My friend says to just put 1680s in the secondaries and call it done.
I see others going YAW with 1000 x 4.
Some rave for 720/1200.
Saw one impressed with 800/1600.
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