I'm going to start shopping for someone to hook me up with a basic Evo IX tune for a Turboback exhaust and intake. I believe this is a fairly common tune, but what kind of mileage is being achieved? And since flashing your ECU is so easy, does anyone offer a "long-trip" or high mileage tune, if you need to make a long slow haul?

Furthermore, are there any physical mods (other than the ones I listed) needed to utilize one of the tunes offered from evoM vendors here?

 

boost controller, Fuel pump is not a need but a cheap safety net when running higher boost

 

Overall, any tune you get, providing its a good tune, your MPG should improve provided you are not WOT all the time or something machanically is wrong. However, your ecu goes into closed loop on highway for best mileage

 

You can change the cruising blocks from 14.7 to 15.4 and this will result in a slightly leaner afr during cruise and give better mpg and have little or no affect on anything else.

 

When I drive my car like a little girl I get 28mpg. Mods are TBE and ECUFlash.

I rarely if ever drive my car that way. In fact I would pick up a second job to suppliment my fuel bill if I had to. I bought an EVO to drive it like an EVO.

 

just remember if you ever look at your maps, once you hit boost, your mpg drops dramatcially, A tune can definitely help but i think staying off boost will make the biggest difference.

 

You can improve milage alot by tuning leaner than stoich at closed loop so long the engine doesn't go stupid. It might be a touchy process but the only reason closed loop is 14.7 is due to the cat.

 

wouldn't just changing the 14.7 area of the main fuel map throw off your fuel trims, and still cruise at 14.7? is there access to the closed loop target afr table? I think I saw a picture of it somewhere but no info on adding it to ecuflash

 

No sure about that but I was told by a very smart guy that has way more knowledge with tuning than me that it was perfectly fine to change the area around the 40-90 load in the 2K-4K range a little higher than 14.7 as long as you were not running a cat and the number seems to top out around 15.4 or so maybe a little higher under ideal conditions. Those lean burn high mpg cars get away with much leaner afr but they are designed to take advantage of it with special heads and compression ratios. Our cars were designed to make power and thus cannot run much higher than stoich without losing power and requiring more throttle negating the leaner numbers.

 

its cool you guys want to maximize your fuel economy, but remember we drive evos..... not prius's or anything along those lines. i mean you guys are talking about miniscule amounts of fuel consumption. Here in chitown where our temps fluctuate from 80-90 last week to 40-50 this week. i rather have a lil safety barrier in my fueling than save that 1 or 2 mpg. just my 2 cents

 

its not for safely at all... its either you need it or you dont... the ix is good til 350-370whp... i know of a few trapping 118-120 on stock ix turbo still runnign the stocker...

 

Okay for mileage in an Evo there are some limits like with anything else.

Number one the easiest way to do it (the only way actually) is to not cruise in closed loop but put the car in open loop. Go to the open loop load tables and in table 2 (#1 is warm up I believe) change the values at 2500-3500 to 45%. Now you can be more drastic and do all of them thats up to you but thats primarily the area we are worried about for the time being.

NOW, go to your high octane fuel map and in the areas between 40-80 or so, alter them to 15.4-15.7 with 15.7 being a peak value at about 60% load. You will need to watch your WB to make sure this didnt take it too lean but with my setup that value got me approx 15.5:1 AFR. Now here are the results:

275 R compounds
Green
Cams
750cc

I still got 26mpg on the highway at 80 in 6th gear (about 3400). My car cruises like this all the time and then I drive to the track, put in 6 gallons of 116, ran 11.5's, go out to eat, then go home.

 

John I guess I missed the part about changing open loop #2. What do those %'s in that table correspond to? They seem to go up to %125 on my car (IX).

 

open loop #2 is the load threshold for transition to open loop from closed loop.

20-40 is idle 40-100 is granma driving 100-150 is agressive, 150+ is boosting

 

any pics of these tables...?