[Mike@N54Tuning.com]

BMS did a little dyno testing this morning with LM on his 2007 335i. He has RB turbos, full bolts ons, CM/BMS meth, and race gas. The main purpose of the testing was to determine if increasing the low fuel pressure would translate in to allowing more fuel to enter combustion. Unfortunately the results were a little inconclusive. At 16-17volts the low fuel pressure remained fairly stable oscillating about 68psi, instead of the steady decline seen at the factory 14volts, but overall fueling capacity was only marginally increased. Up next they will have to work on the low system regulation to see if the oscillation which is created when you run higher than stock high system pressure can be stopped. Ultimately they will raise the low system fuel pressure up from the factory setting of ~70psi to ~80psi to determine if the limitation is anywhere prior to the high pressure pump.

Still, good showing for the JB4 and RB turbos. 512whp, nice repeatable curve, great timing, etc. You can see where it's fuel limited before and after 5500rpm where high system pressure drops and AFR leans out.

Mike

[Keik E92 M3]

Wow now thats some power right there.

[R1000K3]

The car must be a beast, looks great

[mithiral67]

Mike, are any of those at stock voltage or are you just summarizing that these didnt vary from the stock runs?

I know there was a lot of speculation on whether increasing the LPFP would even help much and am curious if you have confirmed that there might be only limited gains from this concept.

[Nack54]

You have to see the car in person, its beautiful.

[Brey335i]

And LM is 6AT I believe... seems like it's a pretty good transmission

[Mike@N54Tuning.com]

Originally Posted by mithiral67

Mike, are any of those at stock voltage or are you just summarizing that these didnt vary from the stock runs?

I know there was a lot of speculation on whether increasing the LPFP would even help much and am curious if you have confirmed that there might be only limited gains from this concept.

Much of the data is under wraps pending analysis but here is a dyno prior to the boost-a-pump at lower boost levels. Looks like it extended the fueling range 20hp or so holding AFR steady at 5200rpm..

Mike

[Syndicategt]

The numbers look similar to Dzenno's without the fuel system voltage increase. Didn't he put out just over 500 rwhp with same mods?

[Trevor008]

Originally Posted by Syndicategt

The numbers look similar to Dzenno's without the fuel system voltage increase. Didn't he put out just over 500 rwhp with same mods?

He did indeed but he is also 6MT as opposed to LM's 6AT which means he has slightly less loss.

[SennaZ]

Originally Posted by Mike@N54Tuning.com

At 16-17volts the low fuel pressure remained fairly stable oscillating about 68psi, instead of the steady decline seen at the factory 14volts, but overall fueling capacity was only marginally increased.

I thought you guys tested the lpfp up to 18V, so just curious why they didn't run it at the max.

[tmdb335]

great numbers wow! I may have to get a set of those RBs lol.

[D335I]

Pretty damn impressive and thanks for working on a fueling solution and pushing the envelope.

[Clap135]

Mike/Terry

I already told you this in one of those epic fuel pump threads. Its not that easy, but im glad you tried it yourself and posted true results. I called these boost a pump kit not doing much if anything.

Based on my experience with DI, its the hpfp that is out of steam, but hell maybe you will proove that to be wrong.

[Syndicategt]

Originally Posted by D335I

Pretty damn impressive and thanks for working on a fueling solution and pushing the envelope.

This is hardly pushing the envelope. I'm actually disappointed with the numbers considering others have put down nearly the same without the "fuel system" upgrade.

[mycoupe]

That is A LOT of area under the curve!

[pcmike]

So unpractical. Who drives around with racegas in their tank?

[mithiral67]

Originally Posted by pcmike

So unpractical. Who drives around with racegas in their tank?

You obviously dont know who lost marine (car's owner) do you.

[Brey335i]

Originally Posted by Syndicategt

This is hardly pushing the envelope. I'm actually disappointed with the numbers considering others have put down nearly the same without the "fuel system" upgrade.

+ 1. I was expecting much more than 500rwhp from the fuel pump upgrade whatever-you-call-it-now.

500rwhp I've seen before...

[pcmike]

Obviously not. Seems needlessly expensive.

Originally Posted by mithiral67

You obviously dont know who lost marine (car's owner) do you.

[mithiral67]

Originally Posted by pcmike

Obviously not. Seems needlessly expensive.

He likes pushing his car to the limit and race gas aids him in his efforts.

[Sniz]

Originally Posted by pcmike

Obviously not. Seems needlessly expensive.

so is everything else he's done, so why stop w Costco gas

the mod bug has hit this one hard.

[Mike@N54Tuning.com]

Originally Posted by Brey335i

+ 1. I was expecting much more than 500rwhp from the fuel pump upgrade whatever-you-call-it-now.

500rwhp I've seen before...

Trying to push over 500rw with this platform is definitely pushing the limits of what is possible. If you disagree feel free to contribute with your own dyno tests. Granted BMS has made 540rw on nitrous and we've seen what that kind of power can do at a fast track as hotrod182's has shown. But at the moment fueling is the major hold up to hitting bigger power numbers. Improving the low pressure fuel delivery was the next thing to test and the results were marginal. There was some benefit but its not the magic bullet everyone hoped for. Just another piece in the puzzle.

LOL @ the race gas isn't practical comments. I don't think this thread is for you.

Mike