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evo 8 injectors and evo 8 fpr swap

ashley

Well-known member
Joined
Oct 1, 2009
Messages
48
Location
medford oregon
how to on a cheap fuel upgrade alternative.
the reson i did this is because:
A) According to my sources, evo8 f.p.r.'s do not have issues with f.p. creep.
B) The evo 8 fpr is rated at 43ish p.s.i.
C) Mitsubishi puts out good o.e.m. parts
D) The O.E. injectors are engineered for the O.E. regulator.
E) CHEAP!

(not including tools, this cost me around $120).

Tools
fine tooth hacksaw
tap (for re-threading)
grinder
buffer
file
evo8 f.p.r.
evo8 injectors

Steps
1. remove and disassemble fuel rail completely

2. clean and install the evo 560's in reverse to the dsm's (direct bolt on)*

3. cut the return line nipple flush on the evo8 fpr.-(as it is bent the wrong way, also trying to bend it the proper way will kink the tube, trust me just cut it off)

4. drill and tap the return using EXTREME CAUTION NOT GO GO TO DEEP. i used a caliper and measured the depth then measured the drill bit and marked with tape.

5. the flange is a little narrower, so cut "open" the bolt flange's.

6. clean everything very thoroughly and blow it out good.

7. buff it!, or paint it, or?? just make it look nice (don't do it half-assed)

8. install in-reverse to uninstalling using washers to overlap the flange.

9. tune ecu.

p.s. I would,(as i did) replace the fuel rail bolts with studs. I don't know about you, but I strip out those threads way to easily.


site source

HOW TO BUILD MAX PERFORMANCE MITSUBISHI 4G63T ENGINES
Robert Bowen, Robert Garcia. Road/Race engineering.
pages 78-88.









 

toybreaker

iconoclast
Joined
Apr 30, 2006
Messages
3,581
Nice write-up!

I would suggest that you replace the o-rings with fresh ones for peace of mind, and thoroughly check the system for leaks before firing up the engine.

Be sure to verify the fuel pressure, before tuning in the new set-up.

Thanks for your contribution. /ubbthreads/images/graemlins/smile.gif
 

123abc

Well-known member
Joined
Mar 2, 2007
Messages
144
Location
Winona, MN
If you swap in a 2g fuel rail it should fit right on. I run a 2g rail and regulator with a 43psi base pressure. The 2g flange looks like it's the same as the evo 8.


Here's a pic of a 2g fpr compared to a 1g fpr:

052511182709.jpg
 

beaner

Well-known member
Joined
Jun 22, 2005
Messages
1,562
Location
b'ham, mi
Quoting ashley:
A) According to my sources, evo8 f.p.r.'s do not have issues with f.p. creep.


It is my understanding that the Evo 8/9's have a relay of some sort that changes the voltage at the fuel pump, so at idle the fpr is not over run as the voltage to the pump is lowered. It is totally possible that the Evo FPR is a better design and handles the fuel better on our cars though. I have ran a 2g rail/fpr before to get the 42.3psi base, but that fpr is junk over a 190 pump. It's a great trick for a very budget setup. Just keep in mind the ecu is always expecting 37psi base fuel. You'll have to compensate for it.
 
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