fuel curves for 7747 running stock vortec shortblock

[EagleMark]

That's not much to go on, would be nice to know the entire setup, engine and mods, trans and vehicle. Even then there is no answer to exact fuel table on a modified engine.

Timing will be off again once you get fuel close... have to get fuel close first then timing. But it runs so your doing better than a lot of guys.

Most newer ECU are MAF... 7747 is SD Speed Density.

Even if we knew exactly what you were working on the answer would probably be the same. Record data, adjust VE record data adjust VE once your close to 128 all the time then work on timing. Dave W has shared a performance small block chevy timing curve he worked hard on, I would use that and work on fuel. Always watch your knock sensor.

Seems you have a wideband you have tuned off of? This is tuning by recording data from ALDL port with cable to laptop. Around here we mostly use TunerPro.

Get your cable hooked up to laptop with TunerPro or whatever you use, get the right files they are all here:
http://www.gearhead-efi.com/Fuel-Inj...d-tuning-files

Yours is (1227747 is $42):
http://www.gearhead-efi.com/Fuel-Inj...Information-42

Record data and adjust VE. There are also some excellent speadsheets Dave has made to do the calculations for you. Enter your VE from chip your starting with, enter recoded BLMs and then insert new VE table.

Hope that gets you going in the right direction!

[Six_Shooter]

Before you go any farther, I have to ask:

Are you using the Vortec spark plugs?

[ODDDOYLERULES]

its got zero mods, stock cam and ex manifolds. Id tune it but i have my equipment tied up in the fiesta project and dont really wanna uninstall it. the wideband i got is kinda a pain to adapt to a new vehicle, I think it was intended for permanent installation.

[ODDDOYLERULES]

the lt1 tables are what most people are using at tg.org, with most saying power is good with the f body ones so thats what we started with and its too aggressive, and we just burned 7747 limp mode fueling into the chip o got from a friend so it'd have a runnable a/f ratio, but its crappy. obviously not right for the air demands of the heads.

[EagleMark]

Before you go any farther, I have to ask:

Are you using the Vortec spark plugs?

He obviously knows something! Are you?

I'll attach a good 7747 bin to start with, it is one Dave has tuned and shared with us.

You can tune with your laptop and a cable, no need to uninstall and reinstall a wideband.

[ODDDOYLERULES]

yeah i can burn and test, thats what we were gonna do. Thats AMUR tuned for what setup though? Im not sure what good I will be able to gleam from that without knowing much else about the setup it is tuned for, as he doesnt have a new cam or high lift rockers or anything. It was just a good running 60K vortec 350 motor from a totaled city rig, nothing special.

i thought that was a joke...

[Six_Shooter]

i thought that was a joke...

Not a joke, serious question.

The Vortec and earlier SBC spark plugs are different.

I faught with a Vortec swap in my Grandfather's '71 Chev Pick up, because he installed older style short reach spark plugs. We were informed of the difference last year, and the difference was night and day.

[1project2many]

The TBI van probably wasn't OBDII. If you look around the pacific performance forum you can find cals and possibly screenshots of various tables needed for your tune. The cals I posted were for a GM 300hp crate motor in a 90 1/2 ton 4X4 truck with 4L60E trans. The truck used a 454 TB and edelbrock TBI intake (waste of $$) so you'll want to adjust the injector constant appropriately.

[EagleMark]

Not a joke, serious question.

The Vortec and earlier SBC spark plugs are different.

I faught with a Vortec swap in my Grandfather's '71 Chev Pick up, because he installed older style short reach spark plugs. We were informed of the difference last year, and the difference was night and day.

Man I had the same thing in a 440 Mopar!!! Guy had Accell short spark plugs for headers! Outside is supposed to be short for headers. They were also short on the inside!!! Spark plug was half way in the threads!!! Never made it to cobustion chamber. Went to get new plugs and they were twice as long? Guy looked up the Accell and came out with one, we compared, half as long... Accell books still list it as correct plug for a 440 Mopar.

[1project2many]

Internet says cal for van with Vortec TBI is BRDW. It's OBD1 and $63 mask. This post on FSC has some info you might want:
http://www.fullsizechevy.com/forum/a.../t-363135.html

If you find a copy of that cal (might be on this site) please link here so I can find it later.
Thanks.

[1project2many]

Spark tables can be taken from iron head, B body LT1 or from OBDII Vortec engine. Reportedly there were van engines with L31 Vortec engine and TBI intake. Edelbrock Vortec TBI intake was originally designed for these engines!! Look for that cal and maybe you've got something. These cals might be from a Vortec head engine with VE tables for a mild cam to get ya started.

[ODDDOYLERULES]

hmmm i dont know any obd2 resources, care to point me to any that are worthwhile? google is so hit and miss I'll be looking but finding a calibration list for my crown vic took days. WHY are there so many ford ecus and cals btw?? FML! doing basic tuning on my crown vic took 6 months of searching just to wind up with a tunable ecu that runs my motor but wont run my tranny.

LOL!