expanding the 3sgte, time to upgrade! Options

[pittfirefighter]

OK so now that i finally have my 2nd gen 3sgte running right... its time to start with the upgrades...
Now what has already been done:

EGR eliminated
cold start eliminated
TVIS eliminated
custom side feed intake
2.5" intercooler piping with FMIC
Garrett T25 turbo
0.5mm oversized forged JE pistons
eagle forged rods
tial 38mm wastegate
3" custom exhaust
and many other little things
check my profile for full list..

SO as almost anyone with the 2nd gen... first thing that i absolutely wanted to change was the AFM... grrrrr i hate that thing
now there are basically three options:
1. 3rd gen ECU, someone at mr2oc.com sells a full kit to upgrade your stock wiring harness to fit the 3rd gen ECU, its $700 including ecu and new map sensor and much more
2. piggyback ecu (i looked into the Greddy E-manage)
3. full standalone EMS

**** important info on the greddy e-manage****
this thing is not made for the 3sgte... it causes nothing but trouble for it. I recently spoke with Dr. Tweak and he says to stay away as well. Not only is it built poorly for a Toyota engine (it can't interpret some of the ignition signals) but Greddy is also bankrupt so getting help for this thing is nearly impossible... stay away and you will be happy

so after some consideration.. my first upgrade in a string of upgrades is a giant jump but i think well worth it in the end...


let me know what you think!

[pitcelica]

simply, because you are running MAP sensor, the fuel map in the stock 3rd gen ECU are Manifold Pressure vs RPM. So, if you are at 4500 RPM and 12 psi, in the fuel map, the injector pulse width (PW) will be, let's say, 15 milisecond.

So, at 4500 RPM and 12 psi :

-a GT35 turbo pushes let's say 200 CFM
-a CT20b turbo pushes let's say 180 CFM

So, the injected fuel will be the same in both situation (same cell in the fuel map), but the quantity of air will not be the same depending of the turbo.

So, because AFR is Air-Fuel Ratio, if :

-180 CFM for 15 ms PW = 11.0:1 AFR ----------->>>>> 180 CFM for 15 ms PW will equal maybe about 11.8:1 AFR.

So, if you want to keep a desired AFR and not lean out the engine, you need a kind of fuel management. But maybe not for under 350 whp because the AFR will not be thrown over 12.0:1 AFR and considered lean.

I hope this clarify a little for you guys.

P.S. All theses numbers are for example and none of them may be true. Do not use them as references.

Thanks

Sam