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Evo X General General discussion on the 2008+ Mitsubishi Lancer Evolution X

View Poll Results: Would you be interested in this kit?
Yes 18 78.26%
No 1 4.35%
Unsure 4 17.39%
Voters: 23. You may not vote on this poll

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Old 02-12-2012, 12:07 AM   #1
Kooldino
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Talking GI: SC Fuel Pressure Regulator Kit

So, anyone who is running an upgraded in-tank pump will see a VERY high base fuel pressure. Personally, mine was a whopping 72psi (where it should have been 38psi).

With some modifications to restrictions in the return system in the tank, I only managed to get my idle pressure down to about 64psi.

With this protype kit, I got my base pressure down to 38-40psi (from 64psi).

I'm thinking of releasing this as a SpeedCircuit FPR kit.

It would come with the following:

  • Your choice of either a 190* U-Bend (for a boomba style rail) OR an adapter to go from the stock FPR to -6AN.
  • -6AN SS braided line.
  • All necessary anodized fittings
  • AEM adjustible FPR
  • Heavy duty FPR mounting bracket powder coated wrinkle black.
  • OPTIONAL fuel pressure gauge
We'd like to price this for around $290 shipped.


Pics:


Adapters and line:






Regulator and bracket:





Is there interest for this item?

EDIT:

Group Buy on now!


https://www.evoxforums.com/forums/showthread.php?t=59482
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Old 02-14-2012, 06:39 PM   #2
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Vote!
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Old 02-14-2012, 06:41 PM   #3
EPmike
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I'll gladly test another one out for you
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Old 02-15-2012, 01:03 AM   #4
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Quote:
Originally Posted by EPmike View Post
I'll gladly test another one out for you
Sounds like a plan. We've got almost enough to make a second kit right here.
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Old 02-15-2012, 02:16 AM   #5
Jakerx
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If I had an upgraded fuel pump, I would definitely purchase this item. However, I do not at the moment.
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Old 02-15-2012, 02:19 AM   #6
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^ Same here, its good to see parts like this being developed and put on the market!!
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Old 02-15-2012, 02:20 AM   #7
joey
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SpeedCircuit makes quality parts. I'd rock it!



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Old 02-15-2012, 03:00 AM   #8
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I'm not to the the point where I need to supply more fuel yet, but it's one of the things I've been trying to plan out, so I'm interested! I have a couple questions, but to get some theory out of the way, let me know if my understanding is right or not. disclaimer: I have 0 hand-on experience with injector scaling yet, just studying so I can deal with it in the near future.

Injectors have a fuel flow rating at a specific fuel rail pressure. For example, ID1000's are rated at 1000cc/min @ 3bar (or 43.5 psi) of fuel rail pressure. However, the actual flow rate of the injectors will be different as that pressure changes.

Actual flow rate = rated flow rate * sqrt(actual rail pressure / rated rail pressure)
and yes, i had to look that up

So in your example with 72psi of rail pressure, if you were running ID1000's, you'd actually be running them as if they were 1285cc/min injectors! ... at least until they max out. You can try to tune it out by adjust injector scaling and latency, but you lose some resolution that way. It's better to correct the pressure the right way via regulation, and just scale to fine-tune.

Am I on base so far?

If so, then I'm confused by how you were able to reduce rail pressure by regulating the return. Can you explain restricting the return side (post-rail) drops rail pressure? Or am I misunderstanding and the regulator is before the rail? Can't really tell form the photo. Thanks!
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Old 02-15-2012, 03:12 AM   #9
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In for one in if it includes a gauge At that price.
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Old 02-15-2012, 03:51 AM   #10
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I'm interested... perhaps really soon! When are you wanting to release?
The -6an line is just between the fpr and rail right?
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