What's my next step for making more power?

iqraceworks · 12-27-2019, 07:26 PM

I need to figure out two things.....

1. With a half tank full of 93 fuel, how many gallons of e85 do I need to add before I top the rest of the tank off with 93 in order to get the ethanol percentage around 40%.

2. After the "initial charge".....when I fill up every time (assuming I fill up when the needle is at 1/2 tank)...how many gallons of e85 do I need to add before I fill the rest of the tank up with 93.

If I can figure those two things out....I will be good to go. I just need to make sure u always fill up the tank with e85/93 when it's 1/2 full....or it's going to screw up my ethanol percentage. Then I just need to monitor my LPFP pressure and see if it's keeping up....or if I need to upgrade it.

Anyone know the answers to 1 and 2? Thanks!!!!

Edit: my fuel tank capacity is 16.1 gallons....

TiAgAu · 12-27-2019, 07:33 PM

Quote:

Originally Posted by iqraceworks

Anyone have any suggestions for a good online calculator or app for figuring out the right fuel/e85 ratios when filling up?

Android app called e85 Blend

iqraceworks · 12-27-2019, 08:12 PM

Thanks!!

WoodE30 · 12-27-2019, 11:31 PM

Just my $0.02 for the thread, I have FBo, inlets and outlet, meth injections at CP, running e50, stage 2 lpfp, jb4, mhd w/BEF. I'd say the best upgrade is the meth injection then running E85. I pushed my stock turbos to hard and now I'm about to install some DAW stage 2+ turbos with upgraded compressor wheel and 3.5 VRSF catback exhaust.

iqraceworks · 12-27-2019, 11:35 PM

Do the aftermarket exhausts on the 335i's add any power....or just sound? I've always read that the stock exhausts flow pretty well and don't restrict much at all.

WoodE30 · 12-27-2019, 11:46 PM

Quote:

Originally Posted by iqraceworks

Do the aftermarket exhausts on the 335i's add any power....or just sound? I've always read that the stock exhausts flow pretty well and don't restrict much at all.

They may add a little power, maybe 10-15 hp. I'm doing it because of the upgrade turbos.

HKD126 · 12-27-2019, 11:54 PM

Quote:

Originally Posted by iqraceworks

Do the aftermarket exhausts on the 335i's add any power....or just sound? I've always read that the stock exhausts flow pretty well and don't restrict much at all.

Pretty sure BMS did a comparison with stock exhaust and open DP on one of their big power single turbo setups and the difference was negligible.

I have an Eisenmann Race exhaust though... I can’t really talk.

Chris@VargasTurboTech · 12-28-2019, 11:25 AM

Quote:

Originally Posted by iqraceworks

Do the aftermarket exhausts on the 335i's add any power....or just sound? I've always read that the stock exhausts flow pretty well and don't restrict much at all.

Depends on the car, 135's are pretty restrictive, E90's are not.

At 475-500 whp range I swapped to the Corsa 3.5" exhaust. It's about 30-40 lbs lighter than stock. Gained 10-15 whp up top, nothing down low. This would increase with increasing horsepower obviously. It sounds good but wasn't the end all be all for power. IMO save your money and do that as a "later on" sort of thing unless you're looking specifically for the sound.

iqraceworks · 12-28-2019, 12:34 PM

Quote:

Originally Posted by Chris@VargasTurboTech

Depends on the car, 135's are pretty restrictive, E90's are not.

At 475-500 whp range I swapped to the Corsa 3.5" exhaust. It's about 30-40 lbs lighter than stock. Gained 10-15 whp up top, nothing down low. This would increase with increasing horsepower obviously. It sounds good but wasn't the end all be all for power. IMO save your money and do that as a "later on" sort of thing unless you're looking specifically for the sound.

How do you know it gained 10-15 whp? Did you Dyno it before and after? If so....did it gain the power down low, or was it all up top at the end of the room range?

Chris@VargasTurboTech · 12-28-2019, 12:37 PM

Dyno.

Power above ~5-5500 IIRC, nothing below that (it was in the normal variation expected run to run). Definite slow increase peaking at my power peak. IMO it was worth it for sound & the weight savings is always nice on pigs like these, but absolutely not a requirement for big power. I've seen well over 700 whp on upgraded turbos and exhaust stock (except for down pipes).

Chris

nicky dj · 12-28-2019, 03:17 PM

I just updated my exhaust for the weight savings and sound knowing that the power increase is negligible. However, I will say at full WOT I do feel that the car wants to give it it's all and doesn't hold back at the top end higher rev ranges.

nicky dj · 12-29-2019, 01:31 AM

Just to give you a perspective on the gains difference. On the E30 map v8.1 and xHP S2 just raced a Track Hawk (albeit with 4 guys in it) twice; off the line it smoked me off course, however on a 30 roll 1/4 mile I beat him by a nose length. I was giddy because I thought I would get smoked again and when they pulled up to me they were surprised and giving me props on what I was running etc.

Once you go E85 you never want to go back.

iqraceworks · 12-29-2019, 07:59 AM

The mhd v7.1 has a 25% , 40%, and 60% ethanol tunes. I'm going to try out the 25% e tune as soon as I burn some of the gas out of my tank (just filled up the car a couple days ago).....then I'm going to log a few runs to see how the LPFP is keeping up.

It sounds like running the 40% e tune is kind of rolling the dice as far as if the stock LPFP can keep up or not.....so I might just stick with the 25% e tune for a while.

People seems to be having some issues with the v8.1 tunes...that's why I'm staying with the v7.1 for now.

Oh...one more question. As far as using the ethanol blend calculator to figure out how much e85 to put in my tank.....does anyone know how much ethanol is in regular 93 fuel? I though that unless it says "no ethanol"....it can have up to 10% in it. Just wondering...because the emix calculator wants to know the ethanol in the gasoline you are adding.

Ozzie335i · 12-29-2019, 10:48 AM

We're talking what, 2 to 3 percent here? A 10 to 15 hp could be nothing more than deviation between runs, atmospheric differences... As Chris pointed out is negligable.

Emilime75 · 12-29-2019, 01:09 PM

Without testing both the 93 and E85, you'll never actually know what the ethanol content is. Regular fuels can be anywhere up to 10%, E85 isn't always 85%.

iqraceworks · 12-29-2019, 02:54 PM

I'm assuming that the DME will adjust the injector timing/duration to maintain the proper....even with the varying levels of ethanol?

Is other words......as long is the mix is close, everything should be fine....right? I'm going to shoot for 25%.....and see how it runs with that.

nicky dj · 12-29-2019, 06:23 PM

Quote:

Originally Posted by iqraceworks

I'm assuming that the DME will adjust the injector timing/duration to maintain the proper....even with the varying levels of ethanol?

Is other words......as long is the mix is close, everything should be fine....right? I'm going to shoot for 25%.....and see how it runs with that.

Yes, just take logs, I do one every fill up after driving around for bit. These OTS maps are on the conservative side.

mweisdorfer · 12-30-2019, 08:53 AM

I think I'd upgrade the turbos to stage 2, add inlets & outlets, a stage 2 LPFP, & a wedge custom tune that's comparable with MHD.

I'd do that BEFORE you upgrade the LPFP.

There are lots of ways to be sure the proper amount of e85 vs 93 octane gas. Plenty of digital gadgets out there for that 😉.

The OEM turbos don't like it when you go over 475hp much less 500hp.

12-27-2019, 07:26 PM	#45
iqraceworks Brigadier General 1995 Rep 3,728 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	I need to figure out two things..... 1. With a half tank full of 93 fuel, how many gallons of e85 do I need to add before I top the rest of the tank off with 93 in order to get the ethanol percentage around 40%. 2. After the "initial charge".....when I fill up every time (assuming I fill up when the needle is at 1/2 tank)...how many gallons of e85 do I need to add before I fill the rest of the tank up with 93. If I can figure those two things out....I will be good to go. I just need to make sure u always fill up the tank with e85/93 when it's 1/2 full....or it's going to screw up my ethanol percentage. Then I just need to monitor my LPFP pressure and see if it's keeping up....or if I need to upgrade it. Anyone know the answers to 1 and 2? Thanks!!!! Edit: my fuel tank capacity is 16.1 gallons....
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12-27-2019, 08:12 PM	#47
iqraceworks Brigadier General 1995 Rep 3,728 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Thanks!! __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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12-27-2019, 11:31 PM	#48
WoodE30 Capt. Maverick 59 Rep 295 Posts Drives: 89 E30 325is, E92 335i N54 Join Date: May 2018 Location: Los Angeles iTrader: (0) Garage List 2013 X5 3.5xdrive [0.00] 1989 325is [0.00] 2008 335I coupe [0.00]	Just my $0.02 for the thread, I have FBo, inlets and outlet, meth injections at CP, running e50, stage 2 lpfp, jb4, mhd w/BEF. I'd say the best upgrade is the meth injection then running E85. I pushed my stock turbos to hard and now I'm about to install some DAW stage 2+ turbos with upgraded compressor wheel and 3.5 VRSF catback exhaust.
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12-27-2019, 11:35 PM	#49
iqraceworks Brigadier General 1995 Rep 3,728 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Do the aftermarket exhausts on the 335i's add any power....or just sound? I've always read that the stock exhausts flow pretty well and don't restrict much at all.
	Appreciate 0 Quote

12-28-2019, 12:37 PM	#54
Chris@VargasTurboTech Lieutenant Colonel 1932 Rep 1,532 Posts Drives: All Things TurboCharged Join Date: May 2016 Location: Bay Area iTrader: (0)	Dyno. Power above ~5-5500 IIRC, nothing below that (it was in the normal variation expected run to run). Definite slow increase peaking at my power peak. IMO it was worth it for sound & the weight savings is always nice on pigs like these, but absolutely not a requirement for big power. I've seen well over 700 whp on upgraded turbos and exhaust stock (except for down pipes). Chris
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12-28-2019, 03:17 PM	#55
nicky dj Chelsea Football Club 345 Rep 780 Posts Drives: E92 N54 Join Date: Aug 2012 Location: Irvine iTrader: (0)	I just updated my exhaust for the weight savings and sound knowing that the power increase is negligible. However, I will say at full WOT I do feel that the car wants to give it it's all and doesn't hold back at the top end higher rev ranges.
	Appreciate 0 Quote

12-29-2019, 01:31 AM	#56
nicky dj Chelsea Football Club 345 Rep 780 Posts Drives: E92 N54 Join Date: Aug 2012 Location: Irvine iTrader: (0)	Just to give you a perspective on the gains difference. On the E30 map v8.1 and xHP S2 just raced a Track Hawk (albeit with 4 guys in it) twice; off the line it smoked me off course, however on a 30 roll 1/4 mile I beat him by a nose length. I was giddy because I thought I would get smoked again and when they pulled up to me they were surprised and giving me props on what I was running etc. Once you go E85 you never want to go back.
	Appreciate 0 Quote

12-29-2019, 07:59 AM	#57
iqraceworks Brigadier General 1995 Rep 3,728 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	The mhd v7.1 has a 25% , 40%, and 60% ethanol tunes. I'm going to try out the 25% e tune as soon as I burn some of the gas out of my tank (just filled up the car a couple days ago).....then I'm going to log a few runs to see how the LPFP is keeping up. It sounds like running the 40% e tune is kind of rolling the dice as far as if the stock LPFP can keep up or not.....so I might just stick with the 25% e tune for a while. People seems to be having some issues with the v8.1 tunes...that's why I'm staying with the v7.1 for now. Oh...one more question. As far as using the ethanol blend calculator to figure out how much e85 to put in my tank.....does anyone know how much ethanol is in regular 93 fuel? I though that unless it says "no ethanol"....it can have up to 10% in it. Just wondering...because the emix calculator wants to know the ethanol in the gasoline you are adding. Last edited by iqraceworks; 12-29-2019 at 08:04 AM..
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12-29-2019, 10:48 AM	#58
Ozzie335i Lieutenant Colonel 659 Rep 1,525 Posts Drives: 2011 335i Join Date: Aug 2014 Location: DFW iTrader: (1)	We're talking what, 2 to 3 percent here? A 10 to 15 hp could be nothing more than deviation between runs, atmospheric differences... As Chris pointed out is negligable.
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12-29-2019, 01:09 PM	#59
Emilime75 Colonel 1209 Rep 2,476 Posts Drives: 2010 335i E92 LeMans Blue Join Date: Dec 2017 Location: Merica! iTrader: (1)	Without testing both the 93 and E85, you'll never actually know what the ethanol content is. Regular fuels can be anywhere up to 10%, E85 isn't always 85%.
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12-29-2019, 02:54 PM	#60
iqraceworks Brigadier General 1995 Rep 3,728 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	I'm assuming that the DME will adjust the injector timing/duration to maintain the proper....even with the varying levels of ethanol? Is other words......as long is the mix is close, everything should be fine....right? I'm going to shoot for 25%.....and see how it runs with that.
	Appreciate 0 Quote

12-30-2019, 08:53 AM	#62
mweisdorfer Major General 1903 Rep 6,968 Posts Drives: 2007 Black/Black 335i e90 Join Date: Apr 2011 Location: Holly, MI iTrader: (0) Garage List 2007 BMW E90 335i [0.00] 2008 bmw x5 [0.00]	I think I'd upgrade the turbos to stage 2, add inlets & outlets, a stage 2 LPFP, & a wedge custom tune that's comparable with MHD. I'd do that BEFORE you upgrade the LPFP. There are lots of ways to be sure the proper amount of e85 vs 93 octane gas. Plenty of digital gadgets out there for that 😉. The OEM turbos don't like it when you go over 475hp much less 500hp.
	Appreciate 0 Quote