Camry & Solara LoungeDiscussion area for every generation of Toyota's family car, the Toyota Camry. Lexus ES250/300 owners welcome! Topics of discussion range from fuel economy, safety, modifications, performance and more.
I'm in the process of having a 5.5 psi pulley made up for my supercharged 1mz. Some of the guys on the solara forum running 5.5 are using the apexi safc II. Can you get away without using a piggyback @ 5.5 psi on the standard ecu, I'm also using a fuel return and a fuel pressure regulator.
BUT one of the reasons for that is because the solara guys and the gen4 camry guys have a returnless fuel system that doesn't incorporate a fuel rail mounted FPR (I presume that you aren't running the stock fuel pump).
Since you say that you have that covered, I would say that you would be okay with running without a fuel regulating piggyback as long as you run a fuel pressure of at least 40psi at idle, and then hook the vacuum port to your boost port so that you'll get a rising fuel pressure with boost.
the problem with that setup though, would be that if you get enough fuel for the top end, you will quite possibly be bogging down the lower end. So, long story short, it'd still be a really good idea to get at least and safc to trim the fuel map for the most efficient performance.
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Sorry forgot to mention I have a walbro 255l/hr fuel pump installed. I think your right about some sort of engine management, I'm looking at the smt6/7.
a question though, is also- what yera of the 1mz are you running? do you have 02 sensors, or A/F sensors?
urd makes splitsecond modules for a/f equipped vehicles that allow tuning in both closed and open loop. with that module, all you would really need is an safcII and you will be safe as well as gain throughout the powerband
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well...lucky for you, urd also has a splitsecond box made more for 02 sensor equipped cars using a boost sensor that hooks up to your boost port. once boost is registered, the box then tricks your ecu straight into open loop, which should be enough to deal with the 5.5psi no problem. but again though, an safc for tuning would definately be a good idea.
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split second can suck my dick. they're POS's.
buy an smt6 from weasy.
AFA open loop tricking... boost presure switch + $2 relay, or smt's trigger output + $2 relay = open loop with the onset of boost.
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AFA open loop tricking... boost presure switch + $2 relay, or smt's trigger output + $2 relay = open loop with the onset of boost.
And no CEL?
Didn't work for my 1MZ back in the years... There has to be some sort of replicated O2 signal to keep the stock finicky Toyota ECU happy all the time Auto trans makes the problem worse because you can't fiddle around with the TPS.
I just went with a standalone and hell with the stock ECU...lol Not like it was any easier, but stupid Toyota makes things too complicated for us boosted folks (the 1MZ '94+ crowd).
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Last edited by Tony the Tiger; 03-07-2007 at 01:23 AM.
It's worked on everything I've ever done it on, obd I & II. The biggest thing is feeding back a fake vta voltage that is not out of perameter.
Obviously, it will shift the transmission like you were at WOT, but... That's not particularly a big problem. If you've got a descent amount of boost, you probably want it rasing the pressure anyways.
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"The lamest twice banned, non-female member of-all time." -Ekam, Thanks, I <3 you too! AIM/Yahoo Toysrme257th
for anything, anytime; including camry turbos Now with Turbo!
It's worked on everything I've ever done it on, obd I & II. The biggest thing is feeding back a fake vta voltage that is not out of perameter.
Obviously, it will shift the transmission like you were at WOT, but... That's not particularly a big problem. If you've got a descent amount of boost, you probably want it rasing the pressure anyways.
LOL, okay, I thought you knew a trick that I didn't know about
Yeah, I did that back in late '02 and with the stock puny CT26 getting boost at 2500RPM, it didn't work at all with the auto. I simply cannot let the transmission do a full kickdown everytime the car builds boost on the highway with like 20% throttle. I was able to deal with the really erratic shift patterns, but it couldn't prevent a possible transmission failure. A full kickdown without the manual line pressure cable at a decent pressure (since it follows with the throttle pulley), the transmission simply slipped like a bitch at every downshift.
Plus, after a few trips, the ECU threw a code 2-trip logic CEL, with TPS and TV out of range... Sometimes I wish I had a 3VZ, because I could be running some uber simple setup and a bunch of MSD stuff that slaps right on...LOL
But ever since URD came out with the O2 simulator linked with boost, the module is quite nice. The unit actually arrived at my door today, and it is going onto a custom turbocharged Chevy Optra that is in my shop right now. He's also running a piggyback and having problems with open/closed loop O2 crap, and the car doesn't go into open loop even if all conditions are met (TPS above 85%, load at 0-vacuum). It has a delay time circuit built in and it takes a few seconds before it goes into open loop as confimed on an OBD diagnostic tool. Cars like this simply has no simple hack around it unfortunately.
__________________ * Goal for 2012 -- 200+ MPH in the Camry
Last edited by Tony the Tiger; 03-07-2007 at 10:31 PM.
eye8, how about a 97 ecu, wiring harness, and ignition components swap. then you have the 3 ignition pulses instead of 6. and obd2 so its easier to monitor and change. ive thought about that before... could then use dis4 and safc2. thats actually what i'd recommend to UK.
glad to see you are still into the 1mz project UK!
I don't see the point of doing all that work for that littel benefit....I'd rather buy the split-second unit than do all that work....but if I were to upgrade (blow my engine and need a swap), chances are I might just swap in a 97+ though. but probably doubtful...the 94 ecu is tricky, but it's not impossible....that, and tony's gone through everything that can be gone through, so I go to him for help and see what he did before
and I would keep the 6 ignition pulses if possible....a bit harder to work with, but less to worry about
what I'm looking into seriously now is a tranny swap
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Running 5.5 psi
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