for those of you that dont know...

i put an 08 xb engine in my 05 tc w/05-06 trd s/c kit w/NST 9.5 psi pulley, w/05 tc ecu and trd reflash.


just got it started today, and my A/F ratio bounces around, at idle its around 15:1 and w/a little bit of throttle, it hits 16 and even bounces up off the gauge's limit which is 17 i think...

averages about 15.9

what do you guys think?

faulty gauge/sensor?
could the increased compression of the engine not be compatible with the ecu how its tuned?

please, all input is welcome.

(Please no questions about why i put the engine in, where i got it, etc, only post relevant to this post. Thank you.)

 

are the lean mix during off throttle or high vacuum? how's the boost afrs? if boost afrs are lean too, you might need more fueling or tuning.. you have big injectors too?

 

from what i read in ur post it seems u have an 08 engine with an 05 ecu

theres ur problem...

the 08's are different than the 05-06's

 

well my boost gauge is showing 4 psi at idle and about 20 under a little bit of throttle, i dont think thats working right, dont have the slightest idea why. the A/F ratio is my major concern, but i really should get the other 2 gauges working as well maybe this is a problem my boost gauge can let me know also...

it is a completely different ecu though thats made for the 9.6:1 compression ratio engine, not the 9.8:1 c/r newer engine, i dont know if that has anything to do with it or everything to do with it..

there is definately alot i need to figure out, i am running the TRD supplied injectors.

 

okay, thats what i was kind of thinking, dammit.

any other suggestions are welcomed...

 

its doesnt sound right, 4 psi on idle? are you sure its not vacuum? seems to me like its a vacuum reading not psi..

 

not only would the compression be off but the cams are different too. you now need a 07+trd tune

 

im new to this gauge, it says 4, wouldnt it have a -4 if it was vacuum?

didnt realize the cams were different, i tried to research as much as i could before i attempted this, but couldnt find much documentation....

 

im probably going to end up getting a stock 05 ecu to match up with my harness and just get it tuned with the aem f/i c

 

what kind of gauge you have.. my old aem gauge doesnt display negative values.. anyways the reflash should have something to do with it..

 

i have the aem boost gauge the one that goes from -30 to 30 psi

 

i didnt know the aem boost gauge goes up to -30.. the lowest ive seen is 22.2 vac.. but i have the truboost

 

so that gauge is 100% correct no doubt about it?

(i mean the a/f r gauge)

 

hard to tell.. you feel poor performance while driving normally? just to let you know off throttle/deceleration/high vacuum (20 up on aem boost gauge) could show lean numbers 15 to -- but should settle back close to 14.7 when back to idel

 

i havent driven it yet...

i was figuring with the s/c it would be under 14. is that true? im just assuming...

 

First off Idle of 15.9 is alittle high but nothing to worry about, however pressing the gas and it going up is.

You need to take it to a Dyno and have them put there Wideband on it and check to see if your AEM A/F is calibrated. Did you calibrate your A/F gauge b4 you started the car?

Also which MAF sensor are you using?

 

what you need to monitor is the a/f in relation to load (vac/boost).. you should be close to 14.7 on vacuum (cruise) as you approach boost pressure afr should become richer.. i would try driving it as the ecu will adjust your fuel trims.. just dont go boost and drive it slowly and see if they will eventually get better.

 

callibrated gauge? no... didnt know i needed to.

 

the '05 tc maf sensor. i figured the other one would have different voltages that would confuse the ecu.

 

Yeah there is a sequence that you should do. I am not sure what your AEM entails, but my Innovate requires a calibration before you start the car.