Hey evogoers,

Just curious if anyone has a evo that runs a little rich below 5200 rpm. I had to lean it out below 5200 rpm by a pct. I also noticed I am not able to lean it out very much above 5200 rpm till redline.
I performed this on a datalogger and it seemed to pull timing if I leaned it out 5 pct above 5,000 rpm. Does anyone know if this is normal?


Evilmania

 

Do a search for safc settings and you should come across a free threads including one i started.

FYI, all our evos run a little rich at high rpms..by the time our rpms hit 4000, most should be down to the AFR 10.5 all the way to redline. Its mitsubishi's solution for detonation.


And the reason u r pulling timing is because the engine ecu detects detonation.. means you're running too lean.. re-adjust the corrections... what mods have u got on?

 

how can you tell if your pulling timing?

 

THe car will be noticably slower in that RPM range or you would have to use a datalogger.

 

TY

 

Angel of mercy,

thanks for your response. I have seen your post on other threads. I am running a stage 1 set up like the Buscher Racing.
We customed built a 3inch downpipe, Hiflow cats and 3inch catback system into magaflows. I am also running a aem intake along with a Hallman boost controler set at 20psi till redline.
My safc settings are pretty conservative but I have been toying with the safc and found pretty good power around 4000rpm thru 7600 by running a 3-4pct leaner. Doesn't seem to be running slower that I can tell. I plan on a wideband bunyon being added when I get a chance. I have seen you run a very aggressive setup. What do you think of my set up on 92 pump gas?

evilmania

 

Evil Mania,

your settings sound about right. Its should still be very safe... check your water and oil temp to make sure you're not running too hot or you may get excessive detonation.. if possible.. put in a new low temp thermostat.. it helps to keep temperatures down in hot weather thus reducing detonation (although some say it makes no difference but i think otherwise... a cooler engine block always helps to reduce probabilities of detonation). I think you should be getting between 240-260whp with these mods... adding in an intercooler should be your next step. What you will also notice is that when you increase boost.. you wont necessarily get more power if you are detonating... putting the new IC will help you get the extra power by cooling the air further, increasing air flow....

Personally, my tuning style is based on engine safety management 1st before power.. hence if u notice my mods...i have mods that cool as well as make efficient the power producing pathways.. e.g. thermostats, plug wirings etc.. I'm also putting in a Tomei Oil Cooler Killer.. which is basically a bolt that stops the oil cooler thermostat from working and ensures that the oil flow is constant at all temperatures thus cooling the turbine as much as possible in all conditions (although some say its not good, i think otherwise, because the turbine runs really hot especially in our 30 degree C weather here). Once u have all these things in, you should be able to pull out more power. If u wanna increase boost.. u need to put in a suction kit for the air passage from the air intake to the intercooler and to throttle body and an uprated actuator for the turbine... (assuming u wana keep the stock turbine like me).