Is it possible to convert a C5 to flex fuel? AKA run pump gas & E85 on the same tune?
11-25-2015, 08:03 AM
#21
Le Mans Master
if you go the full custom OS route why can't the stock vette ecm be made to work?
I'd also love to see wideband monitoring
that and a fully adjustable torq control that could handle 800 ft lbs
but since all of this is made out of unobtanium I think and aftermarket ECU or contacting vengeance is in order.
I really think GM is missing the mark on E85 and boost.
they go well together.
I'd also love to see wideband monitoring
that and a fully adjustable torq control that could handle 800 ft lbs
but since all of this is made out of unobtanium I think and aftermarket ECU or contacting vengeance is in order.
I really think GM is missing the mark on E85 and boost.
they go well together.
11-25-2015, 11:29 AM
#22
Drifting
Thread Starter
I have been researching this myself. It seems you would need an 04 c5 pcm with an OS from some van/Tahoe BUT it's only 2 bar capable.
I'm not very computer savy but how hard would it be to build a custom OS based on the Tahoe OS but just change the flex fuel portion to a newer flex fuel vehicle?
I'm not very computer savy but how hard would it be to build a custom OS based on the Tahoe OS but just change the flex fuel portion to a newer flex fuel vehicle?
Convert OS 12587603 to : OS 1260052
11-30-2015, 04:15 PM
#25
Melting Slicks
found this...
"It can be done with a P59 1MB ECM with HPT or EFI live in 2 or 3 bar. There is 1 512k os that HPT has a cos for that will support a 2 bar setup. EFI live has no such cos for that os but you can do a flex 1 bar NA setup with EFI live and that os. It came in a 2002 truck
"
in regards to an F-body below.
http://ls1tech.com/forums/pcm-diagno...sor-fbody.html
"It can be done with a P59 1MB ECM with HPT or EFI live in 2 or 3 bar. There is 1 512k os that HPT has a cos for that will support a 2 bar setup. EFI live has no such cos for that os but you can do a flex 1 bar NA setup with EFI live and that os. It came in a 2002 truck
"
in regards to an F-body below.
http://ls1tech.com/forums/pcm-diagno...sor-fbody.html
11-30-2015, 09:39 PM
#26
Do the flex fuel GM vehicles have wide bands from the factory? IMO a flex fuel setup is not worth it without a wide band controlling the ECU.
While I've been taking a break from the Corvette scene I've been doing some BMW tuning, and it sure is nice when you can have the ecu make use of the wideband
While I've been taking a break from the Corvette scene I've been doing some BMW tuning, and it sure is nice when you can have the ecu make use of the wideband
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02-26-2016, 02:28 AM
#29
Burning Brakes
http://ls1tech.com/forums/pcm-diagno...-fbody-10.html
Well, not C5 but anyway...
04-13-2016, 09:38 AM
#31
How a GM flex fuel car determine what fuel is using ?
Will a flex fuel tahoe change the timing ?
How can change a segment change on HPT ? (intereseting for aussie lean cruise mod, but dont speak about that... it's not allowen... even if i live in Europe)
Check my math... (Ideal world : Perfect normal fuel tune (14.6 stoech fuel, LTFT active, no LTFT or 2-5% negative LTFT for security, 14.7afr in closeloop, less than 12afr at wot... Don't speak about bad staring using E85... Don't speak about bad fuel)
Because E85 will require a lot more fuel (33%... because 9.8 stoech fuel), in closeloop even with stock ECU/wire/narrowband, the engine know it, and add fuel until 25% (with LTFT, and will hit a 11.025afr)... and after a few time like that, will move on secure tune with check engine light on (= low octane map = less power)
In closeloop, The STFT should add the 11.1% fuel (11.025 to 9.8afr) you need, but NOT IN WOT
In WOT... you will run 12% too lean
My mind : Not good
1st soluce : Add 12% fuel at the tune (for see 14-17%negative LTFT with normal fuel)
In E85 closeloop, you will :
- not hit 25% LTFT
- not have the ckeck engine light
- not have the low octane map
In E85 WOT, you will have just the good fuel (with the 23.72% LTFT)
My mind : Good if you wait enough for having the GOOD LTFT (after restart, after refueling...) and pray JESUS, but you will NOT have more power when using E85
2nd soluce : Add 5% fuel at the tune (for see 7-10%negative LTFT with normal fuel) AND add 4% on the PE tune
In E85 closeloop, you will :
- JUST hit 25% LTFT
- HAVE the ckeck engine light (as a E85 using lamp)
- HAVE the low octane map (but you can copy/paste the high octane map and add a few timing ;-)
In E85 WOT, you will quite have the good fuel with the help of the 25% LTFT... but 0.1%/4.5% rich with the PE mod
My mind : Good if you wait enough for having the GOOD LTFT (after restart, after refueling...) and pray a lot JESUS, but i this case, you will HAVE more power when using E85
3th soluce : Do the opposite if the 2nd soluce, i you see what i mean (for have CHECK ENGINE with normal fuel but the engine will start in E85 timing each time you pull the battery)
4th soluce : Do as the 1st soluce, but choice to add just the half of the E85 need
Will a flex fuel tahoe change the timing ?
How can change a segment change on HPT ? (intereseting for aussie lean cruise mod, but dont speak about that... it's not allowen... even if i live in Europe)
Check my math... (Ideal world : Perfect normal fuel tune (14.6 stoech fuel, LTFT active, no LTFT or 2-5% negative LTFT for security, 14.7afr in closeloop, less than 12afr at wot... Don't speak about bad staring using E85... Don't speak about bad fuel)
Because E85 will require a lot more fuel (33%... because 9.8 stoech fuel), in closeloop even with stock ECU/wire/narrowband, the engine know it, and add fuel until 25% (with LTFT, and will hit a 11.025afr)... and after a few time like that, will move on secure tune with check engine light on (= low octane map = less power)
In closeloop, The STFT should add the 11.1% fuel (11.025 to 9.8afr) you need, but NOT IN WOT
In WOT... you will run 12% too lean
My mind : Not good
1st soluce : Add 12% fuel at the tune (for see 14-17%negative LTFT with normal fuel)
In E85 closeloop, you will :
- not hit 25% LTFT
- not have the ckeck engine light
- not have the low octane map
In E85 WOT, you will have just the good fuel (with the 23.72% LTFT)
My mind : Good if you wait enough for having the GOOD LTFT (after restart, after refueling...) and pray JESUS, but you will NOT have more power when using E85
2nd soluce : Add 5% fuel at the tune (for see 7-10%negative LTFT with normal fuel) AND add 4% on the PE tune
In E85 closeloop, you will :
- JUST hit 25% LTFT
- HAVE the ckeck engine light (as a E85 using lamp)
- HAVE the low octane map (but you can copy/paste the high octane map and add a few timing ;-)
In E85 WOT, you will quite have the good fuel with the help of the 25% LTFT... but 0.1%/4.5% rich with the PE mod
My mind : Good if you wait enough for having the GOOD LTFT (after restart, after refueling...) and pray a lot JESUS, but i this case, you will HAVE more power when using E85
3th soluce : Do the opposite if the 2nd soluce, i you see what i mean (for have CHECK ENGINE with normal fuel but the engine will start in E85 timing each time you pull the battery)
4th soluce : Do as the 1st soluce, but choice to add just the half of the E85 need
04-20-2016, 12:50 AM
#32
Drifting
Thread Starter
04-20-2016, 01:14 AM
#34
Drifting
Thread Starter
Nope, my car hasn't moved in 2 years since I started the high rise intake project.
I got super busy with life AKA- got married, bought new home, went back to school for a new career path (process operator if anyone can help in that area) but in those two years I've also learned to tig weld aluminum, tune with hp tuners, and done several h/c cars and some blower car builds.
Anyways, I'm finishing up a h/c & procharger c6 build and then I'll finish my car. I'm gonna try some new stuff on it.
04-20-2016, 09:11 AM
#36
Drifting
Thread Starter
04-20-2016, 04:41 PM
#38
Drifting
Thread Starter
Roger
