C63 AMG (W204) 2008 - 2015

EflexFuel Kit Installed

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Old 03-17-2018, 12:01 PM
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I think his question is WHY would you even want to run race fuel at 8x the cost of E85. And I am not sure the eflexfuel kit couldn't run it. All it does is measure the amount of ethanol and adjust the delivery. If it doesn't sense any ethanol it won't make any corrections and the fuel system will run as it does stock.
Old 03-17-2018, 12:17 PM
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Originally Posted by G_Money
You can't use race fuels at all with the eFlex kit. Only E85 and pump.

The AFD kit can run any type of fuel in any mixture and adjust itself on the fly.
why the heck would you want to mix race gas with e85? I paid like 240 dollars to fill my car up with ms109 leaving the track.

that is the dumbest thing to do and defeats the whole purpose of using e85
Old 03-17-2018, 02:10 PM
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Originally Posted by skratch77
why the heck would you want to mix race gas with e85? I paid like 240 dollars to fill my car up with ms109 leaving the track.

that is the dumbest thing to do and defeats the whole purpose of using e85
Are you retarded? Im telling you that the AFD system can run any blend of race fuels, pump gas, and E85. The eFlex unit can not run race fuel at all, or at least this is what VRP told me on Instagram when I asked.

I'm not saying anyone would run E85 and race gas. If you don't know why someone might want to use C16 instead of E85, or be able to switch between fuels, I'm not going to explain that to you.
Old 03-17-2018, 02:15 PM
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Originally Posted by G_Money
Are you retarded? Im telling you that the AFD system can run any blend of race fuels, pump gas, and E85. The eFlex unit can not run race fuel at all, or at least this is what VRP told me on Instagram when I asked.

I'm not saying anyone would run E85 and race gas. If you don't know why someone might want to use C16 instead of E85, or be able to switch between fuels, I'm not going to explain that to you.
you dont need to do anything but run your tuned race gas map with race gas period.e85 needs more fuel to hit its target air fuel while race gas dosnt.its actuall gas not alcohol.

there is no need for the injectors to be fooled to dump more fuel on race gas to hit target air fuel ratio.

if someone is running c16 you can bet your motor they are running a dedicated map for c16 and good luck using c16 on our cars with how sensitive our o2 sensors are.

Last edited by skratch77; 03-17-2018 at 02:19 PM.
Old 03-17-2018, 02:25 PM
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Originally Posted by skratch77
you dont need to do anything but run your tuned race gas map with race gas period.e85 needs more fuel to hit its target air fuel while race gas dosnt.its actuall gas not alcohol.

there is no need for the injectors to be fooled to dump more fuel on race gas to hit target air fuel ratio.

if someone is running c16 you can bet your motor they are running a dedicated map for c16 and good luck using c16 on our cars with how sensitive our o2 sensors are.
What I'm saying is you don't need to remap for fuel with the EC/AFD kit.
Old 03-17-2018, 03:51 PM
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This is everything that comes with the EC/AFD kit. Group buy with injectors was 1600. Do these other kits come with everything in the picture? Ive seen a different kit that doesnt have the clips and you need to install the harness pins yourself.
Old 03-17-2018, 05:13 PM
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Originally Posted by bentz69
This is everything that comes with the EC/AFD kit. Group buy with injectors was 1600. Do these other kits come with everything in the picture? Ive seen a different kit that doesnt have the clips and you need to install the harness pins yourself.
as I researched their thread, that appeared early on with injectors until they figured out you don’t need injectors if you aren’t running headers. So my understanding is the kit is now $1600 WITHOUT injectors. So that’s why I want to know, why is it 4x the price?!
Old 03-17-2018, 07:47 PM
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Kit difference it that the eflexfuel kit just comes with a rubber fuel line instead of steal braided and you have to pin the connectors. Neither kit comes with injectors anymore.
Old 03-17-2018, 08:43 PM
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Originally Posted by bentz69
This is everything that comes with the EC/AFD kit. Group buy with injectors was 1600. Do these other kits come with everything in the picture? Ive seen a different kit that doesnt have the clips and you need to install the harness pins yourself.
Only differences I see are that the wires are already inserted into the injector adaptors (which appear exactly the same as the adaptors in the eflex kit) and the fuel hose comes with a metal elbow. Not really sure why. Otherwise not much difference. Ethanol sensor appears identical and the wiring is very similar. Plug to control box appears identical too.

Last edited by Doc Oc; 03-19-2018 at 07:23 PM.
Old 03-19-2018, 08:52 AM
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Just spoke to the folks at eflexfuel and they wanted me to let you guys know that you can run any type of gas you want. Their kit WILL handle race gas, although they said it may be pointless with e85, but if anyone has a reason to run it, their kit will do it. Also, they suggested buying directly from eflexfuel.com as it's a little cheaper on their website than through eBay.

Last edited by Doc Oc; 03-19-2018 at 09:22 AM.
Old 03-19-2018, 12:13 PM
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Any mention of potential of Apple compatibility? Best way to contact them to ask?
Old 03-19-2018, 01:00 PM
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Help@eflexfuel.com will work. I didn't ask about apple, sorry.
Old 03-19-2018, 01:56 PM
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Thanks! Premium prices climbing here in NorCal. So close to pulling trigger on this...
Old 03-19-2018, 02:35 PM
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E85 is a buck cheaper per gallon here so it's a no brainer if you have access. Plus you pick up some extra hp and get the protection of running 100+ octane fuel. Go for it!

Last edited by Doc Oc; 03-19-2018 at 07:23 PM.
Old 03-20-2018, 09:27 AM
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Originally Posted by Crya
Any mention of potential of Apple compatibility? Best way to contact them to ask?
From them:
Hi Chris,

iOS app is coming. We do not know the release date yet but we are testing the beta version. Also new version for Android is coming.
Terveisin / Best regards,

Pekka Salo
eflexfuel.fi
eflexfuel.com
Old 03-20-2018, 02:46 PM
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For anyone interested, get an extra $50 off on this on ebay today only with code PSPRINGTIME
And I kept telling myself to wait a few more days to order
Now I must find something else to apply this coupon on...
Old 04-14-2018, 05:41 PM
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Hey , I was wondering if you could help me out on the e flex fuel install. I got the kit and wired everything up, verified the power side of the harness plug + 12 volts matched everything up or so I thought, and when I start the car I get a bunch of misfire codes. The first time it was just on one on 4 cylinder the second time it was one on

Red to the bottom
5 and 7. To my understanding it does not matter in which order you install the connectors because the ecu controls the firing order. Turned everything back to stock and the car is perfect without a cel. I’m trying to figure out if I have a faulty system or if I really messed up the pin orientation. Do you remember if your plugged looked like this? Red on the outside on the left bank? Also does the car have to be running to connect to the app, because I could not see it on Bluetooth.

Last edited by Dtorre1240; 04-14-2018 at 05:53 PM. Reason: clarification
Old 04-14-2018, 08:05 PM
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The pin orientation is the same for every plug so if you had it reversed I'd think you'd get many more misfires. I had a problem on mine when I tried to force one of the pins into the connector and damaged the wire connection on that pin, causing a msifire on cyl 2. That may be what's happened with yours. I had to have eflex send me a new rig and that fixed it. Check the wires on the connectors that are throwing the code. See if you have continuity between lead ends...if you need help trouble shooting, pm me and I'll send you my cell.
Old 04-14-2018, 08:25 PM
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That looks like the right pin orientation for what it's worth. Have you tested to make sure your ground connection is good? With blue tooth, when you open the eflex app on your phone you don't see the eflex connection right under mb bluetooth? And it doesn't pop up when you search for available devices? It should connect with key in pos 1 or 2. If you don't see it when searching with your phone it sounds like it may not be powered up....which would have to be the ground.
Old 04-14-2018, 09:15 PM
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Originally Posted by Dtorre1240
Hey , I was wondering if you could help me out on the e flex fuel install. I got the kit and wired everything up, verified the power side of the harness plug + 12 volts matched everything up or so I thought, and when I start the car I get a bunch of misfire codes. The first time it was just on one on 4 cylinder the second time it was one on

Red to the bottom
5 and 7. To my understanding it does not matter in which order you install the connectors because the ecu controls the firing order. Turned everything back to stock and the car is perfect without a cel. I’m trying to figure out if I have a faulty system or if I really messed up the pin orientation. Do you remember if your plugged looked like this? Red on the outside on the left bank? Also does the car have to be running to connect to the app, because I could not see it on Bluetooth.
that’s why you get the eurocharged kit. No issues plug and play.
Old 04-14-2018, 10:29 PM
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What is everyone's ethanol percentage they are getting from the pump in your area? The places around here (southeastern us) are only giving me 40% and sometimes 50% at most. Hopefully they'll start getting the good stuff with warmer weather.
Old 04-14-2018, 11:40 PM
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Originally Posted by AMGonFire


that’s why you get the eurocharged kit. No issues plug and play.
The eurocharged kit is great if you don't know how to work on cars, but for people with an ounce of ability (you could direct wire the eflex kit in 45 min if you wanted to) why spend the extra $1200? It's two pins inserted into a connector. Not exactly rocket science. I caused my issue by being too impatient. Not eflex's fault.
Old 04-15-2018, 01:30 AM
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Haven't seen higher then 68% ethanol in my car using the proflex app
Old 04-15-2018, 10:37 AM
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Originally Posted by todthedod
What is everyone's ethanol percentage they are getting from the pump in your area? The places around here (southeastern us) are only giving me 40% and sometimes 50% at most. Hopefully they'll start getting the good stuff with warmer weather.
I topped up a quarter tank of 93 the other day and ended up at 60%. There's a sign on the pump I use that says "contains no less than 75% ethanol".
Old 04-15-2018, 11:28 AM
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Originally Posted by Doc Oc
The eurocharged kit is great if you don't know how to work on cars, but for people with an ounce of ability (you could direct wire the eflex kit in 45 min if you wanted to) why spend the extra $1200? It's two pins inserted into a connector. Not exactly rocket science. I caused my issue by being too impatient. Not eflex's fault.
Should of jumped on the group buy. Price was 1250 shipped. And if you already had a eurocharged tune prior to buying the kit they will give you a new tune

But on a different note. How is everyone mouting the harness? Are you laying it on top of the oem harrness and using zip ties to secure it? When I did that I wasnt able to put the insulation pads in place and have the airboxes sit correctly. I managed to get the harness underneath the fuel rail and ziptied to the fuel rail and the pads sit correct but some connections are touching the intake manifold. Im sure those insulation pads absorb a fair amount of heat to prevent heat transfer to the airboxs but are they reall necessary?

Last edited by bentz69; 04-15-2018 at 11:32 AM.


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