aip

This is concerning my 94 Civic EX with a JDM GS-R motor. It has JE 9:1 pistons and Crower rods, Vortech SC, RC 310 injectors, Vortech FMU (not sure what rate, 6:1 I think), and AEM fuel rail and regulator. There is some more, but thats the basics. Peak boost around 13.5 and the fuel pressure seems to be between 100 and 120 psi. EGT's seem to be ok also. My questions are:

1. I have the Blitz DC gauges and the fuel pressure gauge is electric. The fuel line is 1/4" going to the rail. The sending unit has a 1/8" female pipe fitting. I have a 1/8" pipe tee, with the sending unit hooked into the top, and then pipe reducers that change it back to 1/4" barb fittings. The fuel flows through the line, gets reduced to a 1/8" pipe tee, and then back to a regular line. Will that small reduction cause a difference in the flow and or pressure? And will it throw off his readings?

2. I also have the Greddy wide band O2 sensor and gauge. When it is floored, it starts out at 8:1 A/F, then at about 5000 rpm it starts to lean out alittle and slowly goes to 13.2:1 at redline. I have a Holley 255lph pump, but not the high pressure pump (the high pressure is on its way). The current pump graph shows it does not flow after 90 psi. Do you guys think that the fuel pump just can't support that much fuel pressure anymore at higher rpm's and it is causing the increase in A/F ratio? I know that 8:1 is WAY to rich and that 11.5-12.5 is optimum. Could it also be that the FMU is increasing the rate too quickly? Or is it just that V-TEC is kicking in and letting in that much more air. I don't want to run that rich at the low end. Ideas???

3. I have a MSD BTM. Factory timming is 16 det BTDC. Would you suggest setting the BTM to 1/2? That would make it about 6.5 deg retard overall. Or would 3/4 or 1 be a better setting?

I just got everything together last weekend and am trying to work out the tunning bugs and break in the motor. Any tunning suggestions? Thanks.

blueciv69

yeah thats your pump man.. also retard about 3-4 degrees but not 6.5 thats too much.. it looks to me you have the vtec fuel drop.. I use to lean out at vtec got a inline pump works like a beaut now.. just try not boosting lean that can blow your motor up.. wait for the pump..

aip

Am I going to be ok with the originally supplied FMU that Vortech gave me. I think its a 6:1 and my RC 310 injectors?
What kind of fuel pressure should I expect to be running?
What do a lot of you guys do if you're running 13-14 psi and not using the Hondata?

aip

I'm setting the following:
MSD BTM to 1/3
After I get my Walbro 255lph HP, the base fuel pressure to 35 psi
I have the original FMU (6:1 I think) and RC 310 injectors

What should I expect to see A/F ratio wise when running up to about 13.5 psi?
Should I set the base fuel pressure different?
Should I use a different FMU?