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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 Apr-26-17, 08:29 PM   #26

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Generally, yes...on a TBSS, I can't speak from experience.
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Old Apr-27-17, 04:35 AM   #27
 
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With an 09 OS, I was able to see the E85 sensor. Using a DSteck kit. I don't remember if I used EFI Live or HPTuners to enable it. I'll check some old tunes and see what I can find out.

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Old Apr-27-17, 07:55 AM   #28
 
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Originally Posted by Alpine6 View Post
Has there been success with HP Tuners and flexfuel? My tuner wasn't able to get it to find the sensor.
I do that about 2-3 times a week.
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Old Apr-27-17, 11:09 AM   #29
 
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I do that about 2-3 times a week.
That's because you're the man!

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Old May-02-17, 08:17 AM   #30

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Flex fuel tunes are super popular these days. Even people with n/a setups are doing it.
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Old May-02-17, 09:07 AM   #31
 
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Flex fuel tunes are super popular these days. Even people with n/a setups are doing it.
Doesn't offer much benefit N/A unless the engine has a setup that is timing limited on pump gas. The newer DI stuff has benefits even stock but I rarely run E85 N/A on other applications unless its a high compression LS7 or similar.
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Old May-06-17, 09:55 AM   #32

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Quote:
Originally Posted by STAGEUP View Post
Flex fuel tunes are super popular these days. Even people with n/a setups are doing it.
As you can see in the link, I picked up power with an essentially stock LS2 (no boost). These have nearly 11:1 compression. With less compression, most likely you won't see as much gain n/a, but if you were building a heads/cam combo (or stroker) and cut the heads for 12:1 it should have more benefit. The power is in the ignition timing.
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Old May-06-17, 11:42 AM   #33

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Great info!
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Old May-10-17, 07:07 PM   #34
 
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I am in the middle of doing this conversion now, it is amazing how little info there is on this deal. I have picked up tidbits of info here and there as far as parts and install, etc.. I have gotten everything done except for the pinout to my ecu, I ordered some terminals for my harness plug and ended up getting some that were too big after waiting a week for them, lol grrrr!!! Now I think I have ordered the correct ones, GM micro 64 terminals, hoping so anyways.. I like doing things DIY for the most part, so I bring on some of my own frustration, but at least I learn that way.. the parts, fittings, sensor, fuel pump have cost me about $250, I already have big enough injectors, im N/A, so not too bad so far. Hopefully will have it done in a few days then retune for it. My main objective since im N/A is to be able to be more consistent with my timing, with less timing pull, especially in hot weather and hopefully gain a few ponies to the ground, since I should be able to bump up my timing tables, which are kinda low now.. Looking forward to see the results and gain those few 10ths im looking for....
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Old May-14-17, 08:10 PM   #35
 
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I just finished my flex fuel installation today. I agree, there isnt alot of information out there. I found this link and it seems pretty accurate.
How to Convert a Gen IV GM Truck to Flex Fuel for More Power

On the 2007, you have an E67 ECU and the pin goes into the bottom connector (blue plug on the ecm) pin 5.
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Old May-15-17, 02:11 PM   #36
 
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I think I finally figured out what Kind of pin/connector to use after 3 tries/orders, should be here Wednesday. Thanks to Chad aka 11-6.2, its a (GM mx64 molex connector).. Ive spent $45 on a $.05 cent connector, LOL.... we will see...
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