The fuel system problem.

sunwolf · May 06, 2015, 02:45:12 PM

Ok I eventually want more power than the stock fuel system can handle and I want to do it without meth and without blending E85 (pure e85 might be ok). That being said there is the huge problem of the lack of fuel system upgrades. Is it the LPFP or the HPFP that needs to be replaced or both? Is anyone still working on this?

14SHOCAR · May 06, 2015, 02:49:45 PM

Id be interested as well.

sunwolf · May 06, 2015, 02:53:42 PM

I'm looking at the HPFP from a BMW N63 engine (the one in the new M5 and M6). It looks identical to the pump in our cars and it says it can handle 200 bar (2900 Psi). Wonder if it will be plug and play.

sunwolf · May 06, 2015, 02:57:46 PM

http://www.ecstuning.com/BMW-F10-550i-N63_4.4L/ES1876920/

14SHOCAR · May 06, 2015, 03:08:34 PM

That makes my stomach churn. I had TWO BMWs with HPFP issues. Read the blog here:

http://bittangents.com/2009/01/24/2008-bmw-335xi-fuel-delivery-lemon-story/

I would stay far FAR away from anything that is BMW HPFP related.

FoMoCoSHO · May 06, 2015, 03:23:10 PM

Quote from: sunwolf on May 06, 2015, 02:53:42 PM
I'm looking at the HPFP from a BMW N63 engine (the one in the new M5 and M6). It looks identical to the pump in our cars and it says it can handle 200 bar (2900 Psi). Wonder if it will be plug and play.

Ours is capable of 3000 psi.

panther427 · May 06, 2015, 03:46:52 PM

Simplest bolt on solution is to get a secondary in tank pump or bigger one. Then run a second hp pump off a belt drive system. Piggy back electrical connectors and not sure about an extra fuel port. Could have one pump feed each bank with a crossover.

That's my thought on the matter. Unless there is a bigger fuel pump or reputable rebuild service that can work some magic .

Far as the bmw pump goes does the factory pump have much head soon to supply extra fuel like ours.
Otherwise it could be the same part

sunwolf · May 06, 2015, 04:00:16 PM

Quote from: FoMoCoSHO on May 06, 2015, 03:23:10 PM
Quote from: sunwolf on May 06, 2015, 02:53:42 PM
I'm looking at the HPFP from a BMW N63 engine (the one in the new M5 and M6). It looks identical to the pump in our cars and it says it can handle 200 bar (2900 Psi). Wonder if it will be plug and play.
Ours is capable of 3000 psi.

I have never seen mine go above ~2200 PSI. The BMW is getting almost 700HP on a tune although they have dual pumps.

sunwolf · May 06, 2015, 04:02:33 PM

Quote from: 14SHOCAR on May 06, 2015, 03:08:34 PM
That makes my stomach churn. I had TWO BMWs with HPFP issues. Read the blog here:

http://bittangents.com/2009/01/24/2008-bmw-335xi-fuel-delivery-lemon-story/

I would stay far FAR away from anything that is BMW HPFP related.

From the looks of things they are both Bosch pumps (SHO and BMW).

sunwolf · May 06, 2015, 04:04:23 PM

Quote from: panther427 on May 06, 2015, 03:46:52 PM
Simplest bolt on solution is to get a secondary in tank pump or bigger one. Then run a second hp pump off a belt drive system. Piggy back electrical connectors and not sure about an extra fuel port. Could have one pump feed each bank with a crossover.

That's my thought on the matter. Unless there is a bigger fuel pump or reputable rebuild service that can work some magic .

Far as the bmw pump goes does the factory pump have much head soon to supply extra fuel like ours.
Otherwise it could be the same part

Has anyone done this? Also the BMW is doing 700HP on a tune so there is some head room yes.

AJP turbo · May 06, 2015, 04:31:13 PM

Quote from: sunwolf on May 06, 2015, 04:00:16 PM
Quote from: FoMoCoSHO on May 06, 2015, 03:23:10 PM
Quote from: sunwolf on May 06, 2015, 02:53:42 PM
I'm looking at the HPFP from a BMW N63 engine (the one in the new M5 and M6). It looks identical to the pump in our cars and it says it can handle 200 bar (2900 Psi). Wonder if it will be plug and play.
Ours is capable of 3000 psi.
I have never seen mine go above ~2200 PSI. The BMW is getting almost 700HP on a tune although they have dual pumps.

U shouldn't really see it go above 2200...it's controlled in the tune not to

Sounds right..if we had a dual pump 700 should be pretty easy

FoMoCoSHO · May 06, 2015, 10:46:43 PM

Quote from: ajpturbo on May 06, 2015, 04:31:13 PM
Quote from: sunwolf on May 06, 2015, 04:00:16 PM
Quote from: FoMoCoSHO on May 06, 2015, 03:23:10 PM
Quote from: sunwolf on May 06, 2015, 02:53:42 PM
I'm looking at the HPFP from a BMW N63 engine (the one in the new M5 and M6). It looks identical to the pump in our cars and it says it can handle 200 bar (2900 Psi). Wonder if it will be plug and play.
Ours is capable of 3000 psi.
I have never seen mine go above ~2200 PSI. The BMW is getting almost 700HP on a tune although they have dual pumps.

U shouldn't really see it go above 2200...it's controlled in the tune not to

Sounds right..if we had a dual pump 700 should be pretty easy

Can you modify that in the tune?

AJP turbo · May 06, 2015, 11:29:32 PM

Yeah you can command different pressures by rpm vs load and some other stuff I don't know much about.

But you get to a point where you command a number that it just won't support....like when I'm at 20 or so psi in the upper rpm and I'm commanding 2200psi but only getting 1000 at the rail....or at 15 psi at 2500 rpm and commanding 2200 and only getting 1000psi at the rail....it just doesn't have the capacity

I thought a saw a scalar in my tune that the stock value for a relief valve to open and return fuel to the line at 3000psi...so I guess in theory you could command up to that...I'm not sure how healthy that would be though and the pump could never sustain that anyway under high load

SHOnUup · May 07, 2015, 05:42:16 AM

No mention of this yet?

Rich

SHOdded · May 07, 2015, 05:57:21 AM

Quote from: SHOnUup on May 07, 2015, 05:42:16 AM
No mention of this yet?

Haven't seen anyone willing to try it yet