Well I received my DE-K rail, and injectors today, hoping that they would fit onto my 3.5 lower IM with slight modification. Well the injectors line up in the holes perfectly, but they don't seat all the way because of the mounting holes on the rail aren't high enough. It would require re-welding the 4 mounting holes on the rail for the rail to sit lower, to make the injectors seat all the way down.

Well I don't want to do that, so what I plan to do is use the 3.5 rail (which fits), use the de-k injectors, and the FPR from the DE-K rail. Will this provide sufficiant fuel? Will one side run more rich/lean than the other?



Another question.. When the fuel flows through the fuel Damper on the left side of the pic, is it free flowing, or is the flow changed by the damper?
Oh and I still have to find a way to secure the DE-K FPR to the 3.5 rail..

 

Possible to grind the 3.5 LIM bolt holes to gain clearance? I don't see why the clearance issue, since the injectors are the same length.

From the sound of this, I'd say yes it is free flowing to your fuel damper question:
http://www.findarticles.com/p/articl...01/ai_n9369236

 

I could, grind the the LIM bolt holes lower, but I wouldn't feel comfortable doing that.. The injectors are physically the same size, but the actual mounting part of the rail is physically shorter for some reason.

Good link BTW.

 

Any way you could bend the 3.0 rail "legs" into a V-shape to lower it some?

 

The angle is correct, just the rail itself sits too high. I will try and take some pics tomorrow.

Think of if it as if you were hanging on some monkey bars, but your feet can't touch the ground, unless the monkey bars were lowered.

 

I know this is dumb, but did you remove the spacer aka "insulator" from under the bolt holes in the rail?

 

Why don't you simply use the VQ35 injectors and FPR? I know boosted guys benefit from playing with that but running N/A do you think it's worth the hassle?

 

The DE-K rail will perfectly bolt upto the DE-K lower.

 

I have the 3.5 lower.

JClaw: The DE-K injectors are a bit larger, and this should help with the slight leaness that Tilley is having.

ICEY: I tried removing the plastic black spacers, but still won't seat far enough. I think how I have it now should work hopefully.

 

Then use the 3.5 fuel rail.

 

Thats what i'm currently doing.

 

OK my bad, I should have paid closer attention to the original post.

Yes it will work fine. However I would setup it up for returnless. Use the entire vq35 rail with dampeners and mount an aftermarket FPR under the car.

 

What would the initial setting be on an aftermarket FPR?

And so the aftermarket FPR, would connect to the fuel hose coming from the tank correct?

 

You need to use the base FP that your ECU wants to see (3.0 BAR with 2.5 BAR under vacuum). Then tune from there.

The aftermarket FPR would just recieve and return fuel under the car. It would basically be used as a center tap for the fuel feed line. This is how BMW does it.

 

So at idle, the rail should see 2.5 bar? Do all FPR's have adjustment for base psi?

 

Only adjustable ones, which is not all. Most returnless systems do not have dual pressure modes like return systems do. But since your ECU is mapped to see a difference you would want to set it up that way. Running the vacuum line under the car to the FPR isn't difficult to do. And really you want to just set the running pressure of 3.0 BAR. Because not all FPRs will drop he desired .5 BAR under vacuum.

 

Is it necessary to have it under the car?

3 bar = ~ 44psi right ?

 

The best location for a returnless FPR is to be as close as possible to the fuel rail (for best pressure consistancy) without being in the engine bay (so returning fuel doesn't absorb engine heat).



1 BAR (Atmosphere) = 14.7psi