I'm running a '96 turbo GS-R and recently threw out the Vortech FMU/Bosch pump combination for 450cc '93 Injectors (cleaned and blueprinted by RC)/resistor box/stock pump. I did this a week ago and was only running on one o2 sensor (aft of the cat) and an open downpipe because I need to replace the bottom part due to it rubbing the oil pan after bottoming out. Now that the downpipe is connected, I reconnected the primary o2 sensor and now my car is bogging all over the powerband. My settings are:

1-4k rpm - 38% wide and narrow
4-8k rpm - 37% wide and narrow

I haven't thrown any codes at all (other than the primary o2 being connected) and would like some insight from you guys. I am also running 44psi on the fuel at idle and topping out at 55psi at WOT. Although the primary o2 is a suspect, I'd also want to know if there's any other areas I could look into.

Thanks in advance.

 

I think your setting are to high try this or go here http://www.thedropshop.com/vafc.htm
1-4k= -40%
4.5k= -38%
5k= -36%
5.5-7k= -35%

 

Actually you'll probably end up with -45% or so up to boost and then after that it just depends. Even after Vaportrail tuned mine to a perfect 12:1 it was still a little rich.

 

I've now trimmed the fuel to:

1-3k rpm - 46%
and
4k rpm - 45%
All increasing 1k rpms thereafter I'd enrichen by 1% (7-8k rpm it's at 41%)

The bogging has been reduced and it still feels sluggish in the top end. I did compare my settings to everyone elses here and it seems I have to trim back much more than most people. I hope I didn't lean it out too much.

Thanks for the replies.

 

make sure you have the right pressure sensor. for hondas are 06, not 01. that makes a big difference.

 

Yeah I'm okay with that.

It's been 06-In 06-Out ever since I dialed it in.