I have a question regarding my v6 f-type s, it’s currently tuned for strictly e85 and I was wondering if I should upgrade the LPFP to something fully compatible for e85. I’ve been told the stock pump is fine but I want to check if anybody with a e85 tune on their v6 changed the LPFP. I’ve replaced the stock injectors with the OEM Bosch ones but I am curious if I should switch my fuel pump as well?

 

Hi @SuperchargedFresh

I referred to your other thread about the P2187 code that you have. With this new thread and now knowing that you are running E85, it is not that much of a coincidence that you have a lean code. You said that you have a tune, and I assume it is an E85 tune. If so, that is likely your lean condition. Then if so, you want to get the car back to the tuner to make some adjustments.

If you're running E85 without an E85 tune, then that is definitely the problem and surprised it is the only one lean code.

Just some info at the risk of telling you things you already know.

To run E85 with the OPTION of going back and forth to gasoline, or blends of those, you need to have a flex fuel sensor. A flex fuel sensor basically uses two sets of injector data, then the sensor can signal the ECU to switch to adjust to the different fuels.

If you now ONLY run E85 then a sensor is not necessary (a tune most definitely is) but if you're running E85 or blends of E85 and gasoline with only one tune or the other, then you will experience Lean codes with one of the setups, and rich codes with the other.

Here are some basics (and again, apologize if this is already known)

Stoichiometry - this is the point where the mixture of a fuel with oxygen is at an optimal point to cause a complete burn.

The stoich of gasoline is 14.7:1 - 14.7 part of air for 1 part of fuel.

The stoich of pure ethanol is 9:1 9 parts of air for 1 part of fuel.

Because of these different stoichs of two fuels that might be in your tank, the volume of fuel needed to complete stoichiometry is much greater if you're using ethanol, than if you're using gasoline.

So, now lets consider the lean code(s) you mentioned in the other thread. If you converted to E85 (which needs much more fuel to satisfy the burn the O2 sensors in the exhaust are seeing and you are using gasoline fuel injector data, you're not delivering enough fuel with E85.

Now a P2187 is only referring to an idle circuit and you haven't mentioned any other lean codes such as a P0171/P0174, then I'm guessing you do have an E85 tune but the tuner is a little off in the idle circuit fueling.

I've tuned for cars for 12 years using hack SW. I can tell you that the idle circuit in OBDII setups is difficult to get correct (one of the hardest things I had to learn about tuning). So, my suggestion is if you continue to pull a P2187 and you're not getting other lean codes, and to answer you Q here about LPFP. I suggest it is working BC if it was too little volume, then you'd be screaming P0171/74s once out of the idle circuit and into midrange (CL) or fuel enrichment (OL).

 

Who is your tuner? Have you sent them data logs of your car? If not I would get this going now. Without logs and tuner feedback you have no idea.
I have VAP and he noticed the fuel pressure was borderline when I sent my tuning logs in.
I installed a VMP booster at his suggestion. This makes sure the LPFP is supplied with 18 VDC 100% of the time.

Not sure why we don't see much mention of this because it's a pretty basic upgrade for US muscle cars. It's usually one of the basics done first before tuning to give you the best possible stock fuel system performance. Of course upgrading the fuel pumps is the next step if needed. Again tuning is the key!

Here is VMP list of boosters. We don't have the luxury of a plug and play setup like the Mustang and need to cut and splice wires.
VMP Voltage Boosters

Here is mine installed. I had some trouble finding the right wires to splice into so do some research before cutting any wires.




I noticed no differences and still need to do more data logging. But the car is pretty fast and what VAP wants are some full throttle pulls and I run out of road before I complete the pull!
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thank you for taking the time out to provide insightful info. YES, I am fully educated on this BUT another person may not be so they can definitely use that info, again I appreciate it because I didn’t provide that. I’ve been on a e85 tune for months so it’s not being a on going issue it gets cleared via scanner but sometimes it’ll pop back up, no impact to the performance of the car or fuel consumption. I just want to make sure I’m not overlooking anything that may be necessary for long term operation.

 

viezu tech is my tuner yes I know I should went with VAP but I started viezu so I stayed with them but I will switch my tune to VAP or custom tune specifically for my car’s setup. I will look in the booster, it won’t hurt and yes I sent my tuner data log on the car prior to the code but for a different reason so I plan to switch tuners & go local or VAP.

 

Thanks for the reply and do post back if you get a recommendation for the voltage booster. I installed mine but there is zero information good or bad on the forum about this mod.
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