Note** I am not responsible if you break or mess up your motor, Im not a tuning expert, im not an amateur either, I just know bits and pieces of tuning and im still learning like most people. But After my reserach I know how to tune certain maps on the rom NOT ALL OF THEM. Im only sharing this information to help you people who want to learn how and tune your roms, and help you run your car so your not like GREAT my car cant move out the parking lot, garage where ever your car is.


Ok my previous tune wasnt working so well because I had alot of misfire from the 3000 rpms and up im still having some but now they seem to happen a little higher in rpm which is better than 3k, I think the misfire starts around 4k now but still needs some tweaking.

So I figured why not use the tephra tune high octane with my current rom.

Well It worked GREAT!!! actually alot better than trying to tune from start with 440cc injectors from the wrx

So I will explain exactly what I have on my car and what I have on the tune.


I dont have the 440cc injectors, instead I have the 800cc from the wrx, because the cap was taken off the original injectors. I just found out like 1 month later from my build that I have modified injectors.

2nd I have just a basic custom kit that majority of lancer owners use to turbo thier cars. NOT THE RRM STYLE TURBO KIT. Also I have a 399 maf from the evo 8/9, this might not work for the other mafs.

3rd I used the tephra mod, "only the high octane ignition map"

4th follow senates steps to reprogram the tephra mod to prevent your car from throwing cels, only if you havent even flashed your car from the begining of your turbo build or if you havent even downloaded the rom at all.

5th, using this rom will allow you to run vacumm levels only, not boost levels because of the aggresive tuning from the tephra rom from 100% all the way to the end of the map. So what you need to do is lower your timing in the boost levels of the your map and this should prevent your car from throwing cel's.

Im pretty sure im the only guy here running 800cc injectors without a built motor I had my injector scaling done by roadspike.


I have some cels but there only the 3 count earlier today I had 8 count of knock and now I rarely see any knock counts but my rom still needs a little bit more tweaking.

if you want to discuss this thread just reply underneath.


I dont know if anyone else discovered this but I got really excited and wanted to share this info with everyone

 

Could you please explain a bit more about the tephra mod?? Im getting my tactrix soon, so i will begin tuning, Im trying to learn all i can now!

 

all i did was use a base evo 8 with the stuff that senate mentioned in his ecu swap thread and re-adjusted and my numbers for the 440's worked awesome....

 

I'm confused as to what this thread is trying to convey.

 

here was my train of thought, The evo rom had a scaling of 513, well I had the modified injectors, so I figured that since my scaling is at 770 I wouldnt have to change anything to run vacumm or something like that. And I also thought that if you ran the 440cc you would have to adjust the map a little bit more to run vacumm and of course boost levels as well. Im not sure if JRR adjusted his vaucumm portion on the map. And if he didnt then I need to close this thread because of a misunderstanding.

But the only thing that was changed on mine was just the scaling of course and thats pretty much it

 

senate knows alot more than i do and I got a good feeling that He and JRR are about to prove me wrong about what I just posted but go under senates signature and click this link

Evo ROM on a Lancer ECU: How-To im not sure how to hyper link this but it will explain everything you need.

I only made this thread because I thought I discovered something and got really excited

 

From what I'm reading, your engine began to run better when you scaled your injectors correctly in EcuFlash. If you install different injectors you need to adjust both the scaling and injector latencies. Just like when you swap to a 501 or 399 MAF you need to correct the MAF values for size, scaling, smoothing and barometric pressure.

I'm beginning to think that your misfire issues may be caused by not having the correct values for your injectors and/or MAF. I would spend some time in the Evo EcuFlash threads to get a better understanding about MAF and injector tuning and how they factor into tuning your ECU.

 

I have them stock from the tephra mod, should i change those from the stock 4g94 map non turbo? im reading about injector scaling and latency right now. I just found out that my injectors are maxed out at 882cc

 

here are my current latencies and scalings

4.6875 - 4.944
7.03125 - 3.192
9.375 - 2.184
11.7188 - 1.368
14.0625 - .984
16.4062 - .0624
18.6768 - .432

I lowered the scaling down to 750 because I read on a tuning artice keep your scaling around 15-20% from the rated cc flow

all I need to do is find the math portion and get this figured.

 

To tune your latencies you'll need to look at your trims. See the post here for a basic how-to:

https://www.evolutionm.net/forums/5889337-post4.html

 

ok i think im starting to get this down. so basically the goal is to get the low and mid ltft's close to zero as possible.

now are the low and the mid suppose to be the same?

for example lets say my idle is around .10 and the mid is 10.49 so I would need to lower the scaling as it says in the thread because it is positive.

now if you can get both of them to zero which I dont know if thats possible or not. but are they suppose to be the same number? like the low is .10 and the mid is .10? does that make it perfect
I think this is the part that confused me about tuning

 

Got this out of "how to tune an evo" thread, hope it helps??


You need to make sure that the numbers that you have entered are working properly. To do that you MUST log your fuel trims for an extended period of time. The trims to log are:

LTFT Low = Long Term Fuel Trim Low
LTFT Mid = Long Term Fuel Trim Mid.

Both of these trims fluctuate between +/- 12.5%. The LTFT Low is for idle and the LTFT Mid is for cruising. Your aim is to keep both trim to +/- 5% or less. If the fuel trims are too positive, then the ECU will add fuel and this will royally make your AFR too rich. If your fuel trims are too negative, then the ECU will remove fuel and this will make your AFR too lean.

How do I log my fuel trims?

Logging fuel trims takes a lot of time and you will waste a lot of gas to get your fuel trims as close to 0 as possible.

Let us start with the LTFT Mid. You must drive the car at a steady speed for at least 16 minutes. Why? The fuel trims cycle approximately every 4 minutes. You will need to have them cycle multiple times until they settle on a number in your log. 16 minutes will alow your trims to cycle 4 times. That will give them ample time to settle.

Let us take my example above. We had the scaling at 552 for the 680 injectors. And we cruised at a steady speed of 60 mph for 16 minutes. We found out that the trims went way negative and hit -10%. So we pulled over and incremented the injector scaling twice. The scaling went up from 552 to 572. We flashed the new numbers into the ECU. Then we went logging again for another 16 minutes.

We found out that the trims are still going negative but not as much as before. This time our trims hit -8%. We now know that we are on the right track. But we are nowhere near the +/-5% that we would like to hit. So we pulled over on the side of the freeway again. Incremented the injector scaling in the rom twice. This moved it from 572 to 597. We flashed the new scaling into the ECU and went for another 16 minute log.

The numbers in the log were very close to 0. The LTFT Mid registered around -3. We are almost there. So we pulled over on the side of the freeway and incremented the injector scaling one last time. The new scaling was 609. We flashed the scaling into the ECU and went for yet another 16 minute log. The logs showed a final fuel trim of -1.86. We have dialed the LTFT Mid to as close to zero as possible.

The next step was to log the LTFT Low. This is done by logging the car for 16 minutes at idle. We did that several times and found out that the LTFT Low stayed at the -1.66 level. This is a similar number to the one we achieved with the LTFT Mid trims.

We have finally dialed our fuel trims. Are we done done now? Not yet.

Now you MUST go back and adjust your AFR fuel map to fit the new injector scaling. You are basically going to have to re-tune your fuel map to fit the new injectors. Just follow the section about AFR adjustment in this write-up.

The whole process is very time and gas consuming and it can get very frustrating. But with time and patience, it can be done

 

I've been asking a similar question, which I think is what Steven is sort of touching on. I think the key is, even though the lancer isn't the same as the evo engine, he's saying the evo fuel map is a good starting point when tuning a car with a custom turbo kit. My concern has been about load, since the evo rom "14.7 plateau" is much larger, I'd hate to be going into boost with the engine still striving for 14.7, but I guess I won't know until I have a kit to work with myself.

Timing map...not the same as the evo or tephra maps...don't use them as a reference point, lol.

 

Hey I'm running turbo as well and 950cc WRX injectors could you possibly share your ROM with me I've done a little tuning on my ROM with ECU flash still running Leah after 4 thousand rpm and I richined the fuel maps just before turbo spool and changed injector lattences to curve knock but still experiencing knock above five thousand. I was wondering do you have a standard timing reduction per pound of boost and load