- Joined
- Jun 26, 2020
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- 204
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- Location
- Dearborn Heights, MI
- Vehicle(s)
- 2019 Wrangler JLU Moab/2021 392 Rubicon
Almost no manufacturers outside of GM uses the fuel composition sensor, and even GM themselves use it on a low percentage of vehicles. There was a sharp uptick in usage on DI engines, but the sensor itself is problematic as it's not actually an ethanol content sensor, it senses water soluble content. So it really is essentially measuring what percentage of gasoline is in the fuel. the problem with this method is water reads the same as ethanol, and ethanol is hygroscopic, so it will show an increase in "ethanol content" as the fuel ages. This is why GM had to come up with logic to have to determine if there was water contamination in the fuel which combined readings from the composition sensor, fuel trims from the o2 sensor, and misfire detection.Hi guys.
A couple of questions..
First, I am aware of the Coyote stuff you guys do, so the quality of your work is not an issue.
What I would like to know is:
1. How do you achieve the 'flex' in flex tune? I have a fair bit of experience with E85 and am a big fan. I have always used the Continental sensor inthe return line to grab the signal but you guys seem to not use a alcohol sensor. So just wondering how that is being done.
2. It looks like your tunes are locked and I would like to know if there is a way to unlock them? For instance, if I buy the tuner from you and later on want to add headers, or a cold air or whatever, how can I get the tune adjusted?
3. What are the warranty implications. FCA obviously went out of their way to say no to E85 and after you unlock the PCM, what happens to a) factory warranty and b) do you warranty anything yourself if there was to be a problem?
Thank you.
Now, everyone else in the industry uses what we use, which is "complex modeling" where it takes a bunch of items like fuel trims, fuel flow rate, time for engine warm up, knock sensor background noise, oil pressure changes, and use them all to come up with a calculated ethanol percentage. GM also employs this method of many of their older PFI engines, but there are some DI engines that use it as well. This method in our opinion is more accurate as water is not combustible, and does not contribute to the o2 readings, so it will not give a false high value like the content sensor does.
Now, as far as tunes and self adjustment. No, there isn't a lock or unlock method for them. Our software enhancement for these, combined with our unlock process, software, and hardware are all proprietary for us. we do no offer a "self tune" option for it, especially as almost every supported modification is included in our update program, which is free of charge for most items, some require the items to be purchased from us for a free update, and some we will be honest that we do not support.
Technically, FCA can void your warranty for any modification to the vehicle, now you may elect to fight them on it, and enter a legal battle, but we fully disclose any tuning has the potential to void your warranty, ethanol aside. Also, the reason they say no ethanol is because the calibration doesn't support ethanol. So they have to say that. All OEM's do the same. Heck, the GM truck's, there is like 5 differences between the flex fuel, and non flex fuel version, and it's like 2 fuel lines, the sensor, a wiring harness, and a bracket for the sensor, then it's just a software change. but if you have the truck without the sensor, it will tell you in plain english you cannot run E85. It has nothing to do with the engine, or fuel system not being able to handle it, but it still says it. Ford does this on their 5.0 in the F150, and the 7.3 in the F250/350/450. it's a calibration change between the trucks that do and don't have flex fuel. but the manual still says no ah ah.
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