Justin311

No, actually you do NOT have to get 550s to use an SDR. That is the beauty of an EMS, you program it (or get the maps pre-tuned) for what you have. If you want to run 440s but have control, you buy an EMS and tune (or get maps) for 440s. When you want to run 550s (above 300 whp) you then get the software for 550s. With a GenIII you are locked in to 550s.

And yes, you can get almost any map you want for the basic setups. In addition, I suggest checking ANY set of maps you get with either a wideband on the street or on the dyno, whether they're OEM toyota (genIII), aftermarket company tuned (MINEs, ATS) or somebody elses (anybody with an SDR that has tuned it and will share conservative maps) since EACH car is different.



Seems despite the details, we agree on overall concept. That is all I'm trying to get across, and I don't claim to be an expert on the GenIII ECU.

Mistertwo94t

huh?



My opinions on this matter are based off of real world results that I've seen w/ my own eyes just like yours. There are more than a couple of board members w/ Gen 3's and the stock ECU that don't have issues running over 12psi. I'm not doing any more bench racing than you are yourself.

ramicio

yeah, i was once going to put in a gen3 ecu, but i woulda have needed the VPC harness for the 2nd gen, and they are almost impossible to come by. rickyb used to make them. between that and getting the MAP and MAT sensors, fuel rail, a fuel pump, an FPR, and a setup to put in the MAT somewhere, and eliminate the intake tubing before the turbo to make it non-afm, i rather found myself just waiting like the rest to get an EMS, which i can program with my 440's in here.

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Touge-MR

Wow, tons of good information.

I suppose ill just have to deal with its brick-lookin ass for now. I plan on getting the basic 3' boltons, CT27, Dual stage boost controller, 550cc injectors, and tune it all with the hydra. But i can deal without the injectors and the Hydra for the time being.

RickyB

I should know much better than to wade into this discussion....

I used to make gen2 to gen3 conversion harnesses for folks to connect their Power FC systems to gen2 engines but I quit doing it because the AP Power FC is available for those who want to go that route and because it is easier and cheaper to just repin the stock harness (the information is out there if you look for it).

In general, I do not recommend the gen3 ECU on a gen2 setup. It is true that the gen3 ECU does not control the TVIS but the gen2 ECU does a very lousy job at this as well and I recommend that this job be taken away from even the gen2 the ECU and given to an MSD programmable RPM switch. The speed cut is certainly a pain but this too can be fixed with a simple divide by two circuit the details of which are also readily available if you search.

The main reason I do not recommend this "upgrade" path is that the last thing you need on your modified gen2 is a speed density system that you cannot tune. The AFM system, with all its limitations, does have the one redeeming feature that it adapts well to VE improvements in the setup up until the point where the AFM pegs out. Speed density systems such as the gen3 are very sensitive to VE changes and VE improvements will cause them to lean out. The gen3 maps start fairly rich to begin with to tolerate modest BPUs, but I've seen my share of gen3 AFR dyno charts that look downright scary with even modest improvements.

This "upgrade" is neither an inexpensive nor an easy one. Unless all the parts fall into your lap my guess is that you'll end up paying at least as much as a used VPC for the parts and then you have to deal with the repin and hacks to plug in a suitable MAT sensor. When you are done you will end up with a system that has essentially zero programmability. For it you'll maybe have gained a 20rwhp additional capability from the fuel system and a slight drop in air pressure drop across the intake which you will probably not take full advantage of without an expensive intake with less than 90 degree bends and a velocity stack.

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lDeeZ lNuTz

wow so there's actually somewhat of a benefit with the afm...