[Mike@N54Tuning.com]

Hey guys,

Just saw these JB4 E85 only RB dyno results posted. Pretty solid for stealthy and inexpensive turbos without the headaches sometimes associated with meth. Looking forward to the fuel system upgrades too.

The car is our 2008 steptronic 135i w/ JB4, BMS Flash (lol), RB Turbos, BT/CX racing intercooler, and our downpipes, dci, and occ. Temps were in the low 90s.

We've been running a 50%+ E85 mix working on RB turbo only tuning (no meth), and have come to find we're operating at the limit of our low pressure fuel pump. It's not yet clear whether ours is just giving out or if this is indicative of some sort of wider fuel pump limitation. But work continues on that front. For this testing I installed a "boost a pump" on the low pressure pump and ran it at 100% which is around 17v.

Even with the BAP in place the low pressure was unable to keep up at higher RPM. Shown as "oil temp" in the logs below. It's targeting 72psi but dropping to around 45psi at peak power. When it goes south of 50 more often than not it takes the high fuel pressure down with it. With the BAP maxed out my options on the dyno were limited so I simply leaned it out and bumped up advance to allow for more output. Fortunately E85 enjoys running leaner.

The results are in the dyno below. Overall I'm very happy with the power potential. On a colder day 500rw meth only should not be a problem. And as I've said in the other thread the drivability on these turbos is as good or better than stock. Instant boost and acceleration anywhere you want it. Just the way I like it.

After the E85 tuning I decided to kick on the meth kit for a couple runs just to see how it might effect the fuel pressure situation. No tuning changes were made other than restoring the normal AFR targets. Same boost and advance curve. It's around a 70% meth mix using a CM10 nozzle.

Not surprisingly with the meth flowing power dropped. Which is a fairly good indication that the E85 only tuning is about where we want it. You'll notice in the meth log the supplemental fuel provided by the meth kit was just enough to keep high pressure fairly normal to redline.

[E90Company]

Sick numbers! That car must fly being a 135i.

[SIKH335]

Mike is that a safe AFR of 14:1 between 4500rpm and 5000 RPM seems lean dont you think, for the amount of power its pushing?

[JMARS]

Great Numbers!

[King mode]

i'm loving all these e85 numbers. Going to pressure vendors to create fueling upgrades...

The first who comes out with larger pumps and injectors is going to make a boat load of cash.

[bigdnno98]

The first to come out with pumps and injectors gets $$$$ from me NOW!

[themyst]

I believe the e9X M3 LPFP might possibly be a drop-in solution. I mean ESS is powering their blown cars north of 600 whp without methanol!

[Stucks]

Originally Posted by themyst

I believe the e9X M3 LPFP might possibly be a drop-in solution. I mean ESS is powering their blown cars north of 600 whp without methanol!

oof!

[benzy89]

E85 FTW!!! I'm loving that last sentence, confirming that E85 is not only a quality (and inexpensive) replacement for Race Gas, but that it's also taking the job of Meth



**FLAME SUIT!!! Specifically referencing Meth as an octane booster. It is probably still a quality way to reduce IATs, especially when coupled with an aftermarket FMIC.

[jlcolon2001]

Too bad, we don't have E85 in Puerto Rico

[Zebra99]

Originally Posted by Stucks

oof!

This is interesting. But, if that's so...why aren't more of the high hp guys using it? Why isn't Shiv using it?

The M3 LPFP would be a cheaper/easier solution/alternative to aftermarket given that it's trusted/reliable and readily available!

[spool twice]

gr8 #'s, can't wait until the "flash" is fine-tuned out and if Terry every figures out the LPFP issue's he's having with the test car.

Is this the G4 15ohm or G5 big-turbo board? judging by the taper up top, a G4 board?

P.S. the log is difficult to read with the timing and fuel pressure lines almost overlapping.

[EDM92]

First guy to blow his motor wins! Not to mention, how will the injectors hold up over an extended period of time? Not trying to bash, I would be VERY happy if our motor could handle E85 and lots of power with no issues for an extended period of time. Time will tell.

[bigdnno98]

Originally Posted by spool twice

gr8 #'s, can't wait until the "flash" is fine-tuned out and if Terry every figures out the LPFP issue's he's having with the test car.

Is this the G4 15ohm or G5 big-turbo board? judging by the taper up top, a G4 board?

P.S. the log is difficult to read with the timing and fuel pressure lines almost overlapping.

it was the G5 board but his backend flash was doing most of the work like timing and fuel control.

[idrift4wd]

more torque then fftecs/vishnus single turbo with e85

[bigdnno98]

Originally Posted by idrift4wd

more torque then fftecs/vishnus single turbo with e85

for one, two turbos provide more tq than a single does, that just a given, especially at lower RPMs. two, Shiv limits the tq on the single setup to try to preserve drivetrain parts I assume. I wouldn't be too concerned with peak tq numbers especially when you look at the single turbo tq curve, it's almost flat, providing that 480tq throughout the powerband.

[Myaddiction]

Originally Posted by SIKH335

Mike is that a safe AFR of 14:1 between 4500rpm and 5000 RPM seems lean dont you think, for the amount of power its pushing?

Based on the lack of any timing corrections in the log that your looking at, it seems to be working well. Though I'm sure it's not a long term solution

[SIKH335]

Originally Posted by idrift4wd

more torque then fftecs/vishnus single turbo with e85

Yup and my Stock turbo 335 pulled 508ftlbs what's your point bud

[spool twice]

Originally Posted by Myaddiction

Based on the lack of any timing corrections in the log that your looking at, it seems to be working well. Though I'm sure it's not a long term solution

While we are on the subject, I'm surpised Terry hasn't attempted to advance timing via CPS (which the G5 is fully capable of doing) via his back end flash. There seems to be room for improvement.

But then again, the development isn't completed yet so I will have to wait for the final results

[spool twice]

Originally Posted by spool twice

While we are on the subject, I'm surpised Terry hasn't attempted to advance timing via CPS (which the G5 is fully capable of doing) via his back end flash. There seems to be room for improvement.

But then again, the development isn't completed yet so I will have to wait for the final results

Nevermind, found the answer. Looks like he'll be doing just that as soon as he gets the LPFP issue resolved.

[Slidewayz]

Nice.

What octane was the gasoline ?

[mithiral67]

Thats a healthy power band. Good stuff BMS.