Rotary Car Club - View Single Post - 1994 RX-7: Xcessive LIM & Fuel Rail install (in progress)

scotty305 · 11-29-2009, 02:10 PM

Thanks, TitaniumTT.

All four injectors are ID1000's, I like them so far. One of the guys from Yawpower suggested the fuel dispersion/atomization is better at higher pressure (up to a point, of course). Stock fuel pump and wiring so far; I know it's not ideal for pump voltage but the fuel pressure sensor says that's not a problem yet. The same guy from Yawpower suggested upgrading to a Bosch fuel pump if I want to increase fuel pressure above where it's currently at.

I saw a local RX7 guy using a PFC and wasn't too impressed with the interface or capabilities. I went with AEM because I know a few locals with AEM tuning experience (mostly piston engines though); it can do quite a bit including closed-loop boost and O2 feedback, factory oil metering pump control. Outputs aren't as flexible as the Motec from what I gather, I don't think there's a way to PWM the CCV and CRV like you've mentioned in your thread. I'm using a bit of a workaround to get PWM control of the prespool valve; the EMS has a couple of tables (MAP vs RPM) intended for variable cam control and I'm using one of those.

The car isn't happy idling at 0.85 lambda (12.5 AFR), it wants to see closer to 0.80-0.82 or it will misfire. I've made most of the changes to the primary injectors that should result in a poor idle (further from intake port, higher flow rate, lack of OEM 'fuel diffuser' insert), I'm not sure I'll be able to tune it out. I've been meaning to adjust fuel pressure and see if that makes a difference, might give that a shot this week.

11-29-2009, 02:10 PM	#28
scotty305 Rotary Fan in Training Join Date: Mar 2008 Location: Culver City, CA Posts: 84 Rep Power: 18	Thanks, TitaniumTT. All four injectors are ID1000's, I like them so far. One of the guys from Yawpower suggested the fuel dispersion/atomization is better at higher pressure (up to a point, of course). Stock fuel pump and wiring so far; I know it's not ideal for pump voltage but the fuel pressure sensor says that's not a problem yet. The same guy from Yawpower suggested upgrading to a Bosch fuel pump if I want to increase fuel pressure above where it's currently at. I saw a local RX7 guy using a PFC and wasn't too impressed with the interface or capabilities. I went with AEM because I know a few locals with AEM tuning experience (mostly piston engines though); it can do quite a bit including closed-loop boost and O2 feedback, factory oil metering pump control. Outputs aren't as flexible as the Motec from what I gather, I don't think there's a way to PWM the CCV and CRV like you've mentioned in your thread. I'm using a bit of a workaround to get PWM control of the prespool valve; the EMS has a couple of tables (MAP vs RPM) intended for variable cam control and I'm using one of those. The car isn't happy idling at 0.85 lambda (12.5 AFR), it wants to see closer to 0.80-0.82 or it will misfire. I've made most of the changes to the primary injectors that should result in a poor idle (further from intake port, higher flow rate, lack of OEM 'fuel diffuser' insert), I'm not sure I'll be able to tune it out. I've been meaning to adjust fuel pressure and see if that makes a difference, might give that a shot this week.