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PCM Tuning Tuning Help with HP Tuners and EFI Live

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Old Jun-13-16, 05:42 PM   #21

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I did a full flex fuel conversion on my Fiero recently. Turbo 3.4 DOHC with 19 PSI of boost. And what a difference it has made. I was limited to about 11 PSI on premium, 15 PSI on race gas, but E-85 I run 19, but its making my clutch slip, probably in the upper 400 to lower 500 HP range. Love it.

Not to stray off topic by droning on about my Fiero, I've been considering doing this for my otherwise stock 08 2WD TBSS.

I used to run Nylon fuel lines in my Fiero, just like the TBSS uses stock. But I was concerned with how the nylon fuel lines handle E-85. Most things I read suggested that the nylon fuel lines are not compatible with E-85. I tired to find any OEM E-85 applications that used nylon lines and it was inconclusive. So I converted my car to run stainless braided Teflon lines. A little pricey, but its so pretty. I'm wondering if you know something about compatibility that I've missed.

Second thing, I have HP Tuners for my TBSS. The only params' I could find for flex fuel was "Sensor Present" and "Sensor diagnostics". Not sure yet what other related tables are available. Do you have a public tune or anything that can lean me in the right direction? I can tune myself, but if my software is somewhat limited, it could be a deal breaker for me.

Bottom line, is that unleaded is slightly more than E-85, but I run premium, so the price gap may justify the reduction in mileage with the additional power. And being able to switch between the two is always necessary for a daily.
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Old Oct-20-16, 07:33 AM   #22

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Newer cars tend to have ethanol compatible fuel lines since most states serve up E10 at the pump. I have been going off others' past experience that it is not an issue. When it is, I will certainly change over and make note of it. In an older car, I would certainly switch over the fuel lines like I did in my '83 Buick.

We used EFI Live, but the process should be similar to what is in the story if you have an E67 ECM.

I would consider E85 as a cheap alternative to race gas, and not use it to try to save money daily driving. It allows you to run more timing and make more power.
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Old Oct-20-16, 07:38 AM   #23

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Update: we just completed an LSA swap (I start a separate thread for that when I have time), and it picked up a lot more power at just 60% ethanol. The bad news is I ran out of fuel pump and the front driveshaft broke. Does anyone make an upgrade or I am stuck with a stock one?
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Old Mar-02-17, 12:51 PM   #24

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I remember when I converted my wife's TBSS to flex fuel a few years back. Till this day, my wife hunts for E85 stations because of how it smells. lol
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Old Apr-20-17, 06:46 PM   #25

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Has there been success with HP Tuners and flexfuel? My tuner wasn't able to get it to find the sensor.
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Old Today, 08:29 PM   #26

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Generally, yes...on a TBSS, I can't speak from experience.
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