Max PSI on Stock Twins w/Streetport?
I have a '94 FD3S w/street port (Mazdatrix Templates), Apex Intakes, Downpipe, and BOV on stock twins.
What psi can the stock ECU and injectors handle? Can I boost 12 psi safely? I plan on getting a boost controller and PowerFC in the future but not anytime soon. My next mods will probably be hard intakes pipes, catback, and then the boost controller. And when should I upgrade fuel system? I've read 13 psi or higher I need fuel upgrade and intercooler and a ECU to manage the new injectors? But for now I just want to know if I can up to 12 psi on my stock ECU and injectors with intake, dp, cb, street port. |
I know alot of people say 12 psi is fuel cut...but I frequently saw 14-15 psi on stock twins and ecu with the same mods as you + catback. Seemed like it took it just fine, my A/F gauge (even though they aren't too accurate) never leaned out.
I think you'll be okay, but fyi....my turbos went bye-bye after about 5,000 miles of the 14-15 psi. |
I thought the stock injectors were pretty maxed out at 14psi. ?
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Isn't the stock ECU max duty cycle for the stock injectors somewhere between 60-65%?
According to the fuel calculator it says the max horsepower at the flywheel is like 260ish. I don't know what to do...I want to run 12 psi but only if absolutely safe with the stock ECU and fuel system. |
No, you should not run over 10 psi with the stock ecu. Especially with a streetport, which requires retarding the ignition timing a bit.
Brad, I believe you have to overboost for 2 straight seconds for the stock ecu to enact fuel-cut. I'm surprised that never happened to you. How long did you run like that? mor: You will need a programmable ecu, like the PFC, to run larger injectors. You will need larger injectors to SAFELY run 13+ psi for daily use. Also, IMO, running over 10 psi with the stock intercooler is asking for trouble. I can't believe how much I had to turn down my boost controller to maintain 10 psi when I upgraded to the PFS SMIC (small by IC upgrade standards). I easily gained 1-2 psi just from the IC, which means your turbos will be running easier and cooler when keeping the same boost level. |
Originally posted by rynberg Brad, I believe you have to overboost for 2 straight seconds for the stock ecu to enact fuel-cut. I'm surprised that never happened to you. How long did you run like that? I ran it like that until my turbos went, which was maybe 5,000 miles. I would have turned it down, but 14 psi is so much more fun than 10 psi!! Plus blowing the turbos gave me an excuse to go single ;) |
I got all the bolt on's..99 twins..etc etc... I'm perfectly happy toddling around at 10-11 psi... why is there such a need to run 14psi and above...
I guess just call me gramps.. |
I don't think you can safely run more then 11lbs on the stock ECU and 1bar on a moded ECU (Pettit, M2). I ran 14.5lbs with a Pettit ECU and even with injectors hitting 100% ( I beleive @ 1bar) I had no fuel problems but I did melt the 2nd turbo (sequential) after about 20k mi.
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