2G bigger injector problem

[Littlefoot03]

I got bigger injectors for a good price while my head was getting rebuilt. Once i put everything back together i drove my car around the block and tried doing a pull in 3rd gear and it just bogged and had no acceleration. i have an safc but it came with the car and i am very unfamiliar with any tuning. the injectors are pte 680cc. if anyone could help me get my baby running right it would be greatly appreciated.

 

[wolf alchemy]

I think you have to reset the I
injector parameters. The safc was probably set for what ever injectors were in the car originally. But I could be wrong.

 

[wolf alchemy]

Wait for someone else to confirm what I said since they will be able to tell you what to do.

 

[Littlefoot03]

I think you have to reset the I
injector parameters. The safc was probably set for what ever injectors were in the car originally. But I could be wrong.

if i did that wouldn't it still be out of wack because of the bigger injectors

 

[wolf alchemy]

it's set for the old injectors you have to tune it to the correct injector size. That's what I meant to say.

 

[wolf alchemy]

I've never done any tuning myself except for forza tuning. >D< which doesn't count on here. I know someone will show up to help better than I can.

 

[jared98gst]

Quit giving him.bad info forza tuner
680s are technically out of safc adjustments safe range, 650 where you stop unless you pick up gm maf/trans setup or go dsmlink

Got a wideband in the car? No? Stop now

If you do, start with idle with the car fully warmed up, pull fuel till you get close to stoich areas which you prob won't be able to do on those injectors and safc
Your gonna be pulling up to -50% fuel through top end depending on turbo thats on the car and psi

There is no injector setting its all just manipulating how much air the ecu thinks is coming in

 

[jared98gst]

Be sure to check all safc setting too
4 cyl etc.

There are hundred of write ups/thread on using an safc google is your friend, all same principle, telling the ecu less air is coming so the bigger injectors don't dump to much fuel

 

[Littlefoot03]

Be sure to check all safc setting too
4 cyl etc.

There are hundred of write ups/thread on using an safc google is your friend, all same principle, telling the ecu less air is coming so the bigger injectors don't dump to much fuel

I have the safc installed all correct but I have no idea how it is used. I tried to Google some people's setups for bigger injectors but nothing seemed to work well. When I was reading people were saying that safc could work with injectors up to 720cc?

 

[jared98gst]

How far it will go depends on stock injector size in the ecu
450cc stock
680cc

More than 50% difference which I believe is as far adjustment as the safc will go.
Its just not an optimal setup to be driving around daily, sure you can go to track mess with fuel pressure prob get a decent pass depending on turbo on the car.

Do you have a wideband? Guessing not?
No way to know how much fuel to pull, don't use other peoples numbers to shortcut either

Sure you can keep pulling fuel, until it doesn't buck or hit fuel cut, without wideband though pointless to burn down a 4g cause you didn't know how to use an safc
Apexi website should have manuals
Google safc manual

 

[Littlefoot03]

How far it will go depends on stock injector size in the ecu
450cc stock
680cc

More than 50% difference which I believe is as far adjustment as the safc will go.
Its just not an optimal setup to be driving around daily, sure you can go to track mess with fuel pressure prob get a decent pass depending on turbo on the car.

Do you have a wideband? Guessing not?
No way to know how much fuel to pull, don't use other peoples numbers to shortcut either

Sure you can keep pulling fuel, until it doesn't buck or hit fuel cut, without wideband though pointless to burn down a 4g cause you didn't know how to use an safc
Apexi website should have manuals
Google safc manual

I do have a wideband but it isn't currently hooked up which doesn't really help me right now.

 

[jared98gst]

Hook it up and start pulling fuel, its in real time so with a wideband safc is as easy as it gets, I just never liked the lo/hi throttle setup, always felt I lost alot of part throttle transition with safc setup or old maft. Load is kinda important haha

 

[Archer Fabrications]

Ecmlink is the best investment IF you plan to mod the car any further then Where it's at. In fact, if money permits, I'd say even a stock dsm should have it to optimize the setup, be able to check codes, operate fuel pump and fans on demand, and best of all, almost every engine peramiter can be viewed. It's just worlds better than safc and it's amazing for troubleshooting.

 

[2gmitsueclipse]

Put your old injectors on with old settings on the SAFC if you are not even going to install the wideband. I would suggest just putting it back to stock until you can safely monitor what's going on, but that is unlikely. Tuning is different for each car. Copying settings might help, but not ideal. Keep in mind when changing fuel settings, it is imperative that you verify mechanical timing and check for boost leaks.

 

[Littlefoot03]

thanks guy i actually do plan on buying dsmlink very soon. just have to get some funds together!

 

[inthemidst]

Put all your settings lo and high to -38 it should at least be drive able