re: Homemade larger HFM tube, was fuel pressure regulators.

[alex.fadeev@xxxxxxxxxxx]

jkerouac@domain.elided wrote:
> re:  Homemade larger HFM tube, was fuel pressure regulators.
> 
> What oem fuel pressure regulators from other models or euro spec 
> engines can be swapped directly into an E36 //M3 (OBDII), us spec?

None are necessary.
Blindly bumping fuel pressure across the RPM range is a bad idea 
regardless.

> I've seen Dinan and others list higher 'special' fuel pressure 
> regulators in Euro HFM conversions, 

Jim C euroHFM kit includes neither the fuel pressure nor new injectors.
Draw your own conclusions.

> I used 3 1/4 inner diameter plastic pipe and the rubber of a 3" 
> plumbing clamp coupler.  this is 3/8 inch larger than the inner 
> diameter of the factory tube. 

EuroHFM is 3.5" in diameter. 
Not 3 3/8".

> To adapt my new tube to the factory airbox, 

Stock US E36M3 airbox is 3.0" in diameter.
Euro E36M3 airbox outlet is 3.5" in diameter (surprise, surprise) and is a 
small improvement. Shielded cone filter (K&N or foam) work the best.
You are wasting your time adopting anything to the narrow US airbox.

> stretch the rubber out over  the outlet from the air filter box, 
> and over the inlet to the new tube. The tubing fits just barely 
> into the original throttle body boot.  Silicon spray helps a lot
> to squeeze this together.

This is painful to read.
JK, just buy a proper euroHFM kit from JimC or ECIS and get over with it. 
The kit will come with the new tube, a cone filter, euroHFM (can use x40 
HFM instead), all the mounting hardware and a euroHFM JimC chip. 

> Flame away at me if you will, or give it a try if you're curious. 
> For $8., an Exacto Knife blade, and a few hours work, its worth 
> the effort.

Not.

> One negative is that the idle is slightly wavery occasionally. 
> Doesn't bother me, it might bother some of you. A washer with 
> a smaller size hole constricting the inlet from the throttle 
> body boot to the Idle Control Valve inlet tube ought to take 
> car of that problem.

Great: a hack on top of a hack.

> Enjoy,

No thanks.

alex f

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