3.5L NA w/272's and Chromed ROM

[TUFFTR]

Hello good people! Question time!

I'm running a 3.5L NA engine, with 272's and soon to be extractors and 3" exhaust. As far as mods go, It's also got adjustable cam gears but they are set at 0 for now. More for da bling.

Anyhoo, After months and months doing an entire body loom swap, I've finally got the car running on a TT Chromed ECU from Jester. Now, I suspect one injector is faulty but I'll deal with that tomorrow (and that injector will be replaced this week)

Running a stock MAF, stock fuel system. Throwing a CEL which I'll hopefully have time tomorrow to find out which CEL it's throwing.
Just wanted to know, besides an injector re-scaling, I'd like to keep the fuel and timing map of the TT as it's a bit more aggressive than the NA Map, what else would need changing?

After the car has had the entire exhaust system made up on and put on I will be getting a proper dyno tune (only driving a mere 10 hours for it....only 2 tuners in Australia I trust...) and having all these issues fixed up.

But yeah, the car runs no EGR, no Active anything, it's as basic as you can get (not even ABS) I was hoping to get a mail order ROM that would suffice until then, that just didnt throw a CEL, and possibly had the TT fuel/timing maps but scaled to an NA ROM (better resolution)

Thank you gents!

[Greg E]

I have no idea what all needs to be changed on your car but I can tell you, tuning an NA is no different than a TT.

Set the injector size.
Set the CEL peripheries (in your case, I'd probably turn them all off)
Drive and log fuel trims
Adjust MAF smoothing table to bring fuel trims within spec.

Tuning Open Loop is the same way as a TT car as well. Log knock, wide band (obviously you need it hooked up into the ecu and scaled properly) and adjust your fuel and timing tables for peak power.

It's honestly not hard. Just time consuming.

[TUFFTR]

Hiya Greg! Honestly, I'm not too interested in the tuning aspect as I've done this myself for years on the old aftermarket ECU (hell I tuned the idle, fuel trims, ignition timing, everything from a 100% blank map) and now that I have a reliable solution I'm just keen to get it to well running state and let the professionals on a dyno do its once and only tuning! Maybe I'll need to re-tune it when I get Meth installed but I'm trying pretty hard to have it in before the tune.

Excellent though! so, MAF scaling *should* be the same as it's just a stock NA MAF, so just change the injector size to suit and turn off the peripheries. Sweet. Should be all I need to keep it going. Thanks! Just needed clarification on that was all!

[futurevr4man]

you are going to probably need to play with the VE table too because ill bet it will be too aggressive as far as fueling goes, due to you not having any snails. but idk, i could be completely wrong because the FPR in a tt car bumps fuel pressure 1:1 with boost, so maybe most of the extra fuel comes from that?

anyhow, just be prepared in case.

[3000gttom]

yea, im running the n/a rom and after adding headers i had to add 5-10% across the board to my VE table to bring the fuel trims to a normal range

definitely be careful with "professionals", lots of them made names for themselves tuning muscle cars with carbs and distributors and may not be so good with these... and im not a tuning expert but i dont think there is such a thing as a once and only tune...especially the closed loop stuff

[TUFFTR]

The guy I'm going to is an expert in Tuning Mitsubishi Evolutions. He actually worked for Mitsubishi Australia back when it was operating. Long story short, he really does know his stuff when it comes to Tuning a MAF based mitsubishi.

However, Al your input is appreciated. I've gotta read up more on the VE stuff as I did dabble a bit with VE back on my old ECU but it made no sense to me how this actually worked. Kind of just up or down it until the AFR's are right!

I have a WB02 aswell but currently the sensor isn't in the exhaust. So that's another issue, waiting to get the entire exhaust made up first to have the bung welded in while he's at it.

Hopefully got my hands on an openport 2.0 cable for a few weeks to borrow and do some logs (when I can sort out the final niggly bits of the loom conversion!) and see how I go.

Thanks guys, and keep those ideas and recommendations coming at me

[TUFFTR]

The guy I'm going to is an expert in Tuning Mitsubishi Evolutions. He actually worked for Mitsubishi Australia back when it was operating. Long story short, he really does know his stuff when it comes to Tuning a MAF based mitsubishi.

However, Al your input is appreciated. I've gotta read up more on the VE stuff as I did dabble a bit with VE back on my old ECU but it made no sense to me how this actually worked. Kind of just up or down it until the AFR's are right!

I have a WB02 aswell but currently the sensor isn't in the exhaust. So that's another issue, waiting to get the entire exhaust made up first to have the bung welded in while he's at it.

Hopefully got my hands on an openport 2.0 cable for a few weeks to borrow and do some logs (when I can sort out the final niggly bits of the loom conversion!) and see how I go.

Thanks guys, and keep those ideas and recommendations coming at me

[futurevr4man]

VE = volumetric efficiency.

a higher volumetric efficiency is going to mean its putting in more fuel. a lower volumetric efficiency means the ecu is putting in less fuel. increase for more fuel, decrease for less.

i typed out a more technical answer the first time, but its gets kinda convoluted and confusing so just go off that simple explanation

[3000gttom]

are you talking about merlin from the evolutionm forum? he's in australia and very good

and VE is nothing more than the (mass)/(unit volume) of air in the engine... this controls the size of each individual injector pulse so that there is the correct amount of fuel for the mass of air in the engine

[TUFFTR]

are you talking about merlin from the evolutionm forum? he's in australia and very good

and VE is nothing more than the (mass)/(unit volume) of air in the engine... this controls the size of each individual injector pulse so that there is the correct amount of fuel for the mass of air in the engine

He is one of the two I was talking about! I am keen on going to the other guy however Merlin is the guy who wrote the entire tuning guide to tuning an evo via ecuflash and if anyone would know a mitsubishi ECU back to front it'd probably be him - I'll see, one or the other though they are both very knowledgeable blokes. I do like the fact merlin will also street tune the car which is just too hard to DIY personally, done it for years with the old ecu.....drive, log, check logs, alter file, re-upload, drive, log, check log, alter file, re-upload etc etc etc, over it!

And I appreciate the trying to explain VE to me. My mind works in weird and wonderful ways. Some things make perfect sense, others dont. This is one of them!

So nothing else I would need to alter? besides the standard fuel trims, timing/fuel tables?
I think turning off the things that cause a CEL is first up and just altering injector size. Apart from that I'll leave it to the pros!