Help......

I used to use the Vortec standard FMU. To chance the fuel pressure/boost ratio, all I had to do washer thing inside. I'm now using the Vortec SFMU, and I need to change the calibration to 6:1. How do I do this? Anyone know if I have to change the inside diaphram like the standard one (part number would help too), or is it just set with the screws?

I am running 370cc injectors, with VAFC, looking to run around 12 to 15psi.

Thanks in advance.

 

sounds almost like my setup only u have 370 cc injectors
let me know when u find out

 

i had the same problem w/ my cartech adj. fmu, u reeally need to see idle pressure at around 43 -55, and then your pressure under boost, which really requires a full swing fuel pressure gauge (in car), then u see ur fuel pressure under boost and determine if its 6:1 or 8:1, etc......from what i get of it....check out vortech for tuning info....i did it with cartech.

 

If I have 310 injectors and a 6:1 FMU, what idle pressure should I have? I'm running 13.5 psi


[Modified by aip, 5:41 AM 4/9/2002]

 

I hear that for a turbo car, fuel pressure at idle should be around 40psi or so, give or take a few. I'm not too worried about this at the moment, because I still have the stock FPR inline, and also there's an adjustment bolt on top of the Vortec SFMU to increase/decrease idle fuel pressure.

I'm running a Walbro 255gph pump, and people tell me maximum pressure is is 105psi, and not more than a few seconds. 95psi is really the upper limits. With that in mind, I'm thinking that I'd need a 4:1 now, instead of 6:1, being that 6:1, at 15psi, would give me 90psi of fuel pressure, on top of my base 40psi. 130psi sounds kinda high. With the 4:1, I should be getting 60psi, with 40psi more from idle, making it an even 100psi.

OK, another question. I do not have a fuel pressure gauge inside the car. Can I leave the car idling, and hook up a vacuum pump and feed 15psi of pressure to the SFMU's boost/vacuum nipple, to simulate boost pressure, and read the gauge that way?

 

are you gonna be at atco this weekend??

 

Trying to make it there. Need to work out these fuel/boost problems first.
You?

 

what night are you going?

 

There's an event on Sunday. If it doesn't rain, I'll be there. Still working the bugs out in the car. I hope to be pulling times like I was doing towards the end of last season. With the problems, the Civic still hit 11.8 at 116MPH last night. On that run, the wastegate and pipe coming off the turbo header (Kooks) blew off.