redwar1441

im trying to plan out my turbo project and wondering what the limits of the stock ecu are. Im looking for a dyno before and after the reflash with a s/c or even turbo as well as a before and after a/f ratio. My resources at trd are dancing around the question and hint that its based more around the idea of keeping the egts at optimal ranges for the three way catalist, seems reasonalble. anyone have any idea what the reflash consists of? any change in the fuel cut for the drive by wire or the release delay?

redwar1441

still no replies? no one has any info? zpi kenny? dezod paul joe noone?

06SuperWhite_SoCal_tC

So you're going to build up a custom turbo-kit and you want to know the limitations of the Factory ECU vs. TRD Reflash, why?

bcnu_702

Unless you're getting the TRD supercharger, the reflash is useless. With a turbo, you would need to get a piggyback ecu system like the emanage, or a standalone EMS.

06SuperWhite_SoCal_tC

I was thinking the same thing. ^

redwar1441

yet again....why? what does the reflash consist of? why do some turbos run so rich and so lean at a lower psi and similer power levels as the s/c? it seems the s/c with no reflash runs pig rich up top and the reflash leans it out. why would toyota do this and offer a warranty if its so unsafe according to some.

redwar1441

yet again....why? what does the reflash consist of? why do some turbos run so rich and so lean at a lower psi and similer power levels as the s/c? it seems the s/c with no reflash runs pig rich up top and the reflash leans it out. why would toyota do this and offer a warranty if its so unsafe according to some.

soros151

Well, I just know, seeing some AFR diagrams from S/C, that the TRD reflash migh supposedly run a lean condition of aroun 14.7 up until 4,000 RPM, as in the MMW S/C Intake thread comment I made. But what other AFR diagrams have u seen? All we know is that it seems the stock ECU won't handle 7PSI of S/C boost, but it will defenitly hold up to 7PSI of a turbo. Why? We know the ECU corrects the parameters to adjust to any condition. EGTs for Cats? The Higher the EGT the more prone for those cats to burn. Did u know that froma simple Heat Wrap around the stock header, the first cat would simply melt? WOW! All of this are comments and examples of what we have seen. I really don't know what else do we know about the re-flash. U know we haven't seen what parameters is it running and adjusting, but we kinda know what it does. Maybe I'm just rambling here. Sorry.

redwar1441

best reply on this so far thanks. but only 7 psi s/c? seems so many people run the nst 9.5 pully with no emanage or am i just overlooking something? that seems so lean that you would have to pull alot of ignition timing out to make it not detonate further increasing egts and WAMMO! melted cat.

soros151

The ECU pulls most of the timing in lean conditions. At idle it is (stock) at 15*, then when at WOT, it migh go all the way to 36*, in the S/C, well that MIGHT me another story, even more when running the 9.5 pulley. But I do see the S/C as not too reliable to even bother to get it. If it's not a seal, it's a bearing, and if it's not a bearing, too much boost and CAPUT!

redwar1441

36* full advance seems an awful lot for an a/f or 14.7 boosted with the stock cr. thanks for the input.

soros151

Well, I have seen it myself with my scanner tool.

bcnu_702

Highly recommend getting a piggy back if you run the 9.5 pulley. I know some people are running the 9.5 w/o a piggyback, but it will deteriorate the engine much faster. I would say 7psi on stock ECU, anything higher, whether turbo or s/c, get a piggyback or standalone.

redwar1441

seems to be 7psi is the limit mostly because of emmision reasons. The a/f ratio combined with the timing curve keeps the egt in check for the cat. NST says there pulley is not to be used without the trd reflash, the reflash must pull timimg up top or make it run richer. Thanks for helping me understand the stock ecu a little better.

redwar1441

seems to be 7psi is the limit mostly because of emmision reasons. The a/f ratio combined with the timing curve keeps the egt in check for the cat. NST says there pulley is not to be used without the trd reflash, the reflash must pull timimg up top or make it run richer. Thanks for helping me understand the stock ecu a little better.