[Ahanix]

Originally Posted by PURE340i

Are you guys pumping 4 or 5 gallons of E85 to a full tank of pump to make a E30 blend?

That's the general idea. Safer to pump E85 first so you can guarantee the right mixture.

[marcthedark]

Originally Posted by Ahanix

That's the general idea. Safer to pump E85 first so you can guarantee the right mixture.

Especially as adding E85 to a full tank of gas is difficult (as full is full) LOL

[G.Newt]

Originally Posted by PURE340i

Are you guys pumping 4 or 5 gallons of E85 to a full tank of pump to make a E30 blend?

You should be measuring the ethanol content at the pump, then doing the math off of that. Let's say your E85 pump actually measures E70 (70%). You would calculate 4.74 / 0.7 = how many gallons of your pump's "E85" to put in.

Why 4.74? Our tank is 15.8 gallons, so 10% is 1.58 * 3 = 4.74, which is 30% of your tank capacity.

[kern417]

Originally Posted by G.Newt

You should be measuring the ethanol content at the pump, then doing the math off of that. Let's say your E85 pump actually measures E70 (70%). You would calculate 4.74 / 0.7 = how many gallons of your pump's "E85" to put in.

Why 4.74? Our tank is 15.8 gallons, so 10% is 1.58 * 3 = 4.74, which is 30% of your tank capacity.

you need to calculate 30% ethanol, not 30% e85. 93oct pump gas is e10. so you need to calculate the ratio of E10 and Exx (whatever the pump measures) to get e30.

[G.Newt]

Originally Posted by kern417

you need to calculate 30% ethanol, not 30% e85. 93oct pump gas is e10. so you need to calculate the ratio of E10 and Exx (whatever the pump measures) to get e30.

Thanks for the correction. I had to use a system of equations matrix to solve it with a graphing calc lol.

x = E10 pump gas
y = "E85" gas
%E = measured E content at the pump

x + y = 15.8 (tank capacity)
0.1x + %Ey = 4.74 (30% volume)

As an example, assuming your %E is actually E70, the matrix says 10.53 gallons of E10 pump + 5.26 gallons of E70.

The main lesson learned here, is that my TI-84 is not useless after college like I thought it'd be. Guess I gotta bring this to the pump haha.

[kern417]

Originally Posted by G.Newt

Thanks for the correction. I had to use a system of equations matrix to solve it with a graphic calc lol.

x = E10 pump gas
y = "E85" gas
%E = measured E content at the pump

x + y = 15.8 (tank capacity)
0.1x + %Ey = 4.74 (30% volume)

As an example, assuming your %E is actually E70, the matrix says 10.53 gallons of E10 pump + 5.26 gallons of E70.

The main lesson learned here, is that my TI-84 is not useless after college like I thought it'd be. Guess I gotta bring this to the pump haha.

i use a phone app. it's good because it also accounts for your current engine's ethanol content. so if you're at a half tank with 93 oct (E10), it'll tell you to add more EXX fuel to increase the final ethanol content to 30%. If you're at a half tank and already running E30, it'll tell you to add less to keep the ethanol blend the same.

[B58togo]

I just use this and assume that most pump E85 is probably closer to E70.

http://www.georgebelton.com/E85Calculator.php

[Solid67]

Originally Posted by B58togo

I just use this and assume that most pump E85 is probably closer to E70.

http://www.georgebelton.com/E85Calculator.php

I use the same site and will test my E85 every so often. So far, the E85 pumps near me are still testing at about E83.

[InstigatorX]

Originally Posted by kern417

i use a phone app. it's good because it also accounts for your current engine's ethanol content. so if you're at a half tank with 93 oct (E10), it'll tell you to add more EXX fuel to increase the final ethanol content to 30%. If you're at a half tank and already running E30, it'll tell you to add less to keep the ethanol blend the same.

What app are you using?

[j1980mac]

Originally Posted by kern417

i use a phone app. it's good because it also accounts for your current engine's ethanol content. so if you're at a half tank with 93 oct (E10), it'll tell you to add more EXX fuel to increase the final ethanol content to 30%. If you're at a half tank and already running E30, it'll tell you to add less to keep the ethanol blend the same.

"CalculateE85" in the App Store is the one I use.

[kern417]

Originally Posted by InstigatorX

What app are you using?

I'm on android and mine is called "E85 Blend"

[B58 parts]

Been driving around for a few days now with the burble off, I don't miss it.

But .. the rev hang and the complete bog on certain normal 2>3 shifts remains. Every once in a while I'll drop into 3rd at slight throttle and lower rpm ~2k and there's nothing there. Just normal driving around town. I have to clutch in and blip to get any power back it's like the injectors are off or the plate is stuck fully closed.

[kern417]

Originally Posted by YuminNuman

Been driving around for a few days now with the burble off, I don't miss it.

But .. the rev hang and the complete bog on certain normal 2>3 shifts remains. Every once in a while I'll drop into 3rd at slight throttle and lower rpm ~2k and there's nothing there. Just normal driving around town. I have to clutch in and blip to get any power back it's like the injectors are off or the plate is stuck fully closed.

Try to log and show what's happening. I had this issue on a previous car but it was believed to be transmission protection from shifting too fast. i only really experienced it during racing or at the drag strip. i've never experienced anything like that on my 440i.

[dstanding]

With BM3 is it possible to adjust settings/maps "on the fly?" Or does each change require a reflash? Let's say I want to be able to quickly switch to a valet mode.

[G.Newt]

MHD posted on Facebook that they have updated B58 maps in preparation for the forthcoming XDI pump. Anyone else here any news on this elsewhere?

[MTWO]

Originally Posted by dstanding

With BM3 is it possible to adjust settings/maps "on the fly?" Or does each change require a reflash? Let's say I want to be able to quickly switch to a valet mode.

You have to reflash but takes only like 10-15 seconds to do

[dstanding]

Originally Posted by MTWO

You have to reflash but takes only like 10-15 seconds to do

So just keep the cable in the car and make sure my phone has a good signal theN?

[Ahanix]

Originally Posted by dstanding

So just keep the cable in the car and make sure my phone has a good signal theN?

Keep cable in your car, make sure the Wifi agent is up to date or it won't let you flash (I had this issue a couple weeks ago when I switched from E30 to ACN91 and had to sit in the costco parking lot for 10 minutes updating it)

I would recommend downloading the maps for offline flashing so you don't have to worry about good signal.

[kern417]

Originally Posted by G.Newt

MHD posted on Facebook that they have updated B58 maps in preparation for the forthcoming XDI pump. Anyone else here any news on this elsewhere?

I saw that too, but I feel like they're jumping the gun on that one. Maybe it's just me. Why release maps for hardware that's not released yet?

I've noticed MHD relies heavily on integration with other aftermarket vendors like JB4 and PureTurbos to sell their products. I think it's mostly a marketing thing unless the pump is getting released this week or something, which would surprise me since it hasn't even been hinted at during development.

[G.Newt]

Installed NGK 94201 plugs at 0.022" gap today. Very smooth power delivery. No more bogging on occasion at WOT. Idle seems about the same, but time will tell if the once in awhile rough idle for a second goes way.

But immediately I noticed how smooth it runs now, not that it was bad before. I'm at altitude (5,000 ft), so YMMV. But these seems like a winner.

EDIT: Forgot to mention I'm running Stage 2 91. I'll be going to Stage 2 E30 soon and can update.

[kern417]

Originally Posted by G.Newt

Installed NGK 94201 plugs at 0.022" gap today. Very smooth power delivery. No more bogging on occasion at WOT. Idle seems about the same, but time will tell if the once in awhile rough idle for a second goes way.

But immediately I noticed how smooth it runs now, not that it was bad before. I'm at altitude (5,000 ft), so YMMV. But these seems like a winner.

EDIT: Forgot to mention I'm running Stage 2 91. I'll be going to Stage 2 E30 soon and can update.

was it already time for replacement or you just upgraded?

[G.Newt]

Originally Posted by kern417

was it already time for replacement or you just upgraded?

Upgraded because of mentioned bogging on WOT occasionally. Also an idle stumble on occasion as well.

Idle seems fine, just normal fluctuations.
But the power delivery is smoother.

Also, I only have a year of warranty left and am only at 30k miles. I doubt they replace them for free.