Okay just to get a head start on my turbo installation this weekend I decided to go ahead and install the 450cc injectors(DSM) and the S-AFC computer. After everything was ready I decided to set the lo/hi throttle settings since I had the time.
1k-4k rpm. -40%
4k-5.2k rpm. -38%
5.2k-6.4k rpm. -36%
6.4k-7.6k rpm. -35%

Now, I thought that it was only gonna work after the turbo was running, since their was gonna be more air pressure coming from the turbo and only then will the extra fuel was gonna be needed. Then my father told me that it had to idle as is; w/o turbo, since their was gonna be no boost at low rpm's. I thought about it, started the car and the car idle really smooth. I hit the gas and the motor didn't act up in any way at all.
Now my ? is, do I need an aftermarket fuel pump since the one I have seems to be working ok? Also, was the motor supposed to act normal even though I have all that extra fuel???
I'm gonna get the turbo in this weekend and I don't want to go lean and cause major problems, so any advice is greatly appreciated...
Thanks

 

You'll need a bigger fuel pump. More air with boost=more fuel needed and the stock fuel pump won't really cut it. Althought it may be okay for low boost. Say 5-6 psi but I'd suggest getting one just incase. I know for my VAFC hack I'm gonna run a walbro 255 lph.

 

I have the fuel pump, (Holley/255ltr.) but why will i need it since the one that's there is supporting the setup on the S-AFC. I mean, will more fuel be needed when the turbo is installed? You saw my settings on the AFC, isn't that the amount I'll need for my turbo setup?

And if I need more, where is it gonna be supplied from? the factory ecu or the AFC? Which one is gonna decide when the extra fuel is needed?

 

go go gadget bump...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by joey1320 &raquo;</TD></TR><TR><TD CLASS="quote">I have the fuel pump, (Holley/255ltr.) but why will i need it since the one that's there is supporting the setup on the S-AFC. I mean, will more fuel be needed when the turbo is installed? You saw my settings on the AFC, isn't that the amount I'll need for my turbo setup?

And if I need more, where is it gonna be supplied from? the factory ecu or the AFC? Which one is gonna decide when the extra fuel is needed? </TD></TR></TABLE>

The AFC and the factory ecu are working as one. All the AFC does is allows you do change the factory maps so that you can get more air/fuel.

 

the ecu and the afc work as one, but the afc is tunable. when under boost, you need more fuel, as fuel is injected into the engine, you will need more fuel by having a intank fuel pump to supply enough fuel to your fuel rail to have enough fuel in the rail at all times.

 

So let's say I want to install my fuel pump and VAFC in preparation for the turbo going in. What should I set the VAFC at?