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Frequently Asked Questions

Do I need anything to run E30/E85?

For E30 you do not need to change anything but the tune on the car. However we will not tune a Mustang or Fiesta on E30 without an upgraded intercooler. The Focus RS intercooler is OK but could benefit from being upgraded. The biggest benefit of E30 is that you can run more spark, that is where most of the power comes from. If you have a stock intercooler the charge air temps reduce spark timing to prevent knock. Though the chances of getting knock on an E30 tune is low we still prefer to make the most out of the tune without any handicaps. We recommend the ETS intercooler for its perfect fitment, unbeatable performance, anodizing options, and affordable price. For the Fiesta ST we recommend the MAPerformance Intercooler.  Link for the ETS/MAP intercooler below:

Straight E85 you will need one of our port injection systems linked below, for the Fiesta ST there will be a kit available in the future:

The link above contains all information on what is needed to run E85 in your vehicle along with suggested modifications to run in conjunction with the port injection system. 

Mixing E30

First step is to test the E85 percentage at the pump you are going to be using. You can test it with the below:

Once you know the ethanol percentage of the E85 you will need to use our ethanol mix calculator to determine how much of each fuel to put in your car to reach your desired ethanol mix. Please bookmark the page below, it is setup perfectly for mobile for use on the go!
The calculator is most important when you need to fill up on E30 if you already have E30 in the tank. The Calculator will ask you for the ethanol content in your tank currently. This is because you can’t do the same mix ratio every time or you will run too much ethanol and the car will go lean. 
It will also ask you for percentage of fuel in the tank currently, you can find that by making a gauge on your accessport “Fuel Level Input” and it gives you a percentage of fuel in the tank based on your vehicles tank size (Sizes listed  below). If it says 25% that means you have 25% of (Tank size) gallons of fuel in your tank. 
Alway account for the ethanol that is already in your 91 or 93oct. Unless you are in the midwest and your pump specifically states ethanol or alcohol free you have 10% ethanol in your fuel. Make sure you enter that into the calculator as 10% goes a long way. 
Once you have the mix right and tank filled up you can flash your E30 tune. I suggest driving for 10-15 miles to ensure the E30 makes it to the fuel rail. Your sending unit and lines can hold a lot of fuel, so best to run it for 10-15 miles to be sure. 
Tank Sizes:
  • Focus RS - 13.9 Gallons
  • Ecoboost Mustang - 15.5 Gallons
  • Fiesta ST - 12.4 Gallons

Check Engine Lights

Here is a list of common check engine lights and their cause:

  • P04DB - This mostly comes up when you alter the PCV system with a catch can or breather plate. 
  • P0171 - Common with ethanol tunes or modified intake systems, it gives a false lease condition due to over compensation of the ECU to maintain stoich AFR. 
  • P0141 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0131 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0054 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0135 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0137 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0138 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P0420 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
  • P061B - Torque error from the tune not accounting for additional torque
  • P0035 - Bypass valve unplugged, most common with aftermarket BOV
  • U0284 - Grill shutters unplugged, most common with intercooler installs as shutters have to be removed.
  • P0071 - Ambient Air Temperature unplugged, this sensor is usually overlooked when an intercooler is installed. It is located on the lower grill shutter and needs to be removed from the shutters and re-installed 

My Car Smokes After Exhaust Changes

If you get a smoking issue after you installed a downpipe or catback exhaust you need to address your PCV system. The factory PCV doesn't allow for enough crankcase venting and builds pressure and pushes oil past the turbo seals. The solution is to add a catch can and gut the factory PCV valve or run a Radium Crankcase Breather Plate linked below. Both will require a catch can, you cannot gut the factory PCV and run it in the stock configuration as you will pressurize your crankcase system and cause more issues. 

If you have a Mishimoto or other brand catch can you will want to make sure you have a checkvalve between the intake manifold and catchcan. Simply cut the line and install the 100psi UPR Checkvalve linked below: