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evo 8 injectors and evo 8 fpr swap

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Galant VR-4 org Post #: 978543 posted 03/21/11 02:19 PM     Remind Me!  Send Private Message   Edit Post      
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.

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

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

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

Robert Bowen, Robert Garcia. Road/Race engineering.
pages 78-88.

Posts: 48 | From: medford oregon | Member Since: 10/01/09 | IP: ( | Report this post to a Moderator

toybreaker Galant Moderator
it's peace of mind at 100 mph plus

Galant VR-4 org Post #: 979431 posted 03/24/11 09:13 AM     Remind Me!  Send Private Message   Edit Post      
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.

the bitterness of low quality remains long after the temporary joy of a low price has faded

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Galant VR-4 org Post #: 995553 posted 05/25/11 07:33 PM     Remind Me!  Send Private Message   Edit Post      
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:

Posts: 144 | From: Winona, MN | Member Since: 03/02/07 | IP: ( | Report this post to a Moderator

Blew1 Guy Today

Galant VR-4 org Post #: 996012 posted 05/28/11 01:43 AM     Remind Me!  Send Private Message   Edit Post   
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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