svtwhat?

iTrader: (17)

do you or anyone happen to have those stock files? there is not a 8.1 avalanche 4l80 05 file on the repository.

07V

svtwhat?

iTrader: (17)

cr250r

iTrader: (4)

Hey guys I have a 2003 Silverado 5.3l lm7 DBW aside from running the wires from the fuel composition sensor what operating system or tune would I need to reflash? I live in Minnesota and e85 is dirt cheap would love to be able to run it instead of gas or mix if fuel prices go higher on regular fuel. I have the new hp tuner mpvi 2

Max Germain

2004 Silverados have OS running flex tables.

AINT SKEERED

iTrader: (2)

I done this and only way to get this to work was scale my injectors 40%smaller. And my sensor which is the part number 13577429 , does not work. Cant get it to read.

as for the tune, I have efi live cos5 and car runs flawlessly. Load in the 02 Tahoe operating system and it is very lean with every possible table copied over to the new operating system.
any tips?

MaroonMonsterLS1

did you copy system options table?

AINT SKEERED

iTrader: (2)

Im not sure what that is.never seen that table

MaroonMonsterLS1

you're only supposed to segment swap the tahoe fuel segment. Not the whole OS
Did you follow the instructions in the thread?

AINT SKEERED

iTrader: (2)

No I will have to look it over see where it's off.
The tune come from Geoff at eps for flex fuel. Her has used it lots of times with success but not in my car. We loaded my tables into the tune

Ted Kay

iTrader: (2)

Anyone using this PCM for flex fuel?; Serv. No. 12576106 with Hwd. No. 12570558. I believe it is for an 03' truck.Going into 02' F-body.
Good thread!
Thanks.

saabman

Hello
I am returning with a question about fuel pumps...
My setup is in a 2000 Suburban and I am wondering if the Fuel Pump isn't acting up...
I wonder if the Flex Pump isn't different? There are a choice for 2002 FlexFuel Trucks of Oblong or Square connectors on the pump the last being for Flex Fuel...
Is it possible to adapt the Flex Pump or will a Gas pump be enough for OE type setup?
Thanks for your inputs :-)
And Happy 2020 !

Guillaume Malaquin

I have my factory fuel pump and I'm flexfuel since 2017 and never fill it up with anything than E85 since then

saabman

Thanks for the tip, my factory pump might have sucked-up some dirt in the tank and I will be dropping it to clean it and thought that I would see if there were any real differences... the only I can see is the square connector is for FlexFuel models...

rel3rd

iTrader: (43)

Is there any way to have a P01 OS with both a FLEX FUEL option and 3 BAR RTT OS?

When car (2000 Trans Am) was acquired, 2+ years ago, it had a 2002 SILVERADO P01 12212156 > 1261002 3 Bar RTT OS in it
(Turbo car at that point in time, with 6.0, 4L80E setup)

I have unlimited 2002 Silverado credits, FWIW...

Approximately 6 months ago, now running NATURALLY ASPIRATED, I converted car to FLEX FUEL (w/ sensor), using first...
Write Entire: 1261002 > (STOCK RANDOM 2002 Silverado, 6.0, 4L80) 12216125, then...
Write Entire: 12216125 > to an already Flex enabled (2002 Silverado, 6.0, 4l80e) 12216125 > 1252013 2 BAR OS

2 bar, only because it was the easiest to find/use, and was free to use.
Flex Fuel option works great, and reads alcohol % on my HPTuners VCM scanner logs

I've now added a turbo setup again, and at some point, MAY run more than 15# of boost...

Problem is, I cannot find a matching P01 FLEX enabled, OS that will allow me to add the 3 bar RTT option into it.
OR...
Another 12216125 OS that I can hopefully add the flex option, AND then the 3 bar myself

From what I read in this thread, I shouldn't have been really able to Write Entire, two non matching operating systems, should I have? And I can't figure out how TWO 2002 Silverado OS's have two completely different (last 4 digit) ID numbers...6125, and 2156?

If anyone can point me in the general direction, I'd appreciate it.

I "assume" that supposing I made 20# of boost, it would simply fuel at the highest VE on the 2 bar tune?

I have a 3 bar MAP sensor, but 2 bar tune/OS...
MAP reads correctly, and matches boost gauge or vacuum gauge.
Have only made 14-ish pounds of boost so far, but that's what got me thinking....

MaroonMonsterLS1

No. Not with P01

rel3rd

iTrader: (43)

Dang, thanks for reply, and I figured as much.

Do you know if the fueling would simply do as the timing does (timing ends at 1.20 grams cylinder airmass)...and will just use the last line of the graph (in this case 210kPa), and carry that VE number on?

In other words, (and just an example), say, VE number from 5000 to 8000 RPM is 150% @ 210kPa, would it just stay at 150% up to 315kPa, if that was the final boost level?

MaroonMonsterLS1

Yes, you can max the fuel table and let it ride the lase row of cells.
P59 I believe can do flex/3 bar but no RTT
RTT isn't really all that necessary. Just saves some time between edits/flashes.

rel3rd

iTrader: (43)

Thanks again.
The RTT is no biggie for me, since I've never really had it work correctly for me anyway.
Just wanted the option to be able to tune the fueling, IF I up the boost...I can live with what I have.

Ping King

iTrader: (20)

Resurrection on this thread.

What's everyone doing for VINs and HPtuners on the Tahoe OS?

Are you able to run your existing licensed VIN on the new OS?