lol

 

i bet you he is biting his tongue right now.

 

Maybe he was talking about the K20A? Afterall, K20A>4B11T. But seriously, maybe he's talking about N/A car with a turbo? I'm being very generous here. Even on the inferior 4B11T running the bare minimum (wastegate) boost on a stock turbo (i.e. 12psi) you're not going to see an additional 7-8mpg.

 

Whatsup

That why i said shop... maybe i should of explained it better, im no machine, lol

and yes that is true about what people will and wont pay for... on the evo and other maf cars it can get time consuming based on how **** you get.

 

Just did a turn around trip to vegas and back... average speed of 85 mph,, highest continuous, 90mph, lowest 80mph, occasional spirts to 105, some WOT to pass cars, managed 310 miles to the tank, the road is not flat either, climb to 4000ft over a long period during the trip... thats over 4k continuous... im still working on it to get it better

alot of testing on the street and on the dyno still to be done, first i need to redo this fuel system mitsu put together cuz its not all that good imo...

for the most part i have freeway dialed, just need to tweak stop and go more, etc, etc...

currently on 1300, 255, 35r, and ams tmp

im not trying to sell info, just spread it once i have a general good baseline

 

i will also like to add, my current fuel econ testing is at high speed and high rpm, i very rarely drive at 65mph...

drive at 90mph for at least 70% of the time on one tank and watch where the fuel goes.... this is what prompt me to start trying to get better mileage since i travel approx 2000 miles a month...

my next fcous is at ~3000rpm and lower, that will come after i tweak my fuel system shortly...

...what im doing is noting new under the sun, it has already been done by others before me, after me, and on other various platforms

 

It's possible that instead of 18 MPG he's getting 25 MPG in open loop at those speeds.

Basically you can tune whatever AFR you want to run at in open loop based on the AFR maps, just takes a bit of time to dial it in perfectly. AFR's averaging 15.5 instead of 14.7, 3-4* more timing advance, tuned MIVEC, larger/less spool happy turbo all can contribute towards that MPG increase.

You can actually tune the car to run in open loop all the time, but it's not an easy task to get perfect and going too lean for extended periods of time can break things.

 

true.
Right now I'm targeting 15.7 in some areas...

even guys with smaller turbos can see this increase, just takes more effort in controlling your right foot.


the goal is not to run it super lean, only to take excess fuel away where you don't need it.

14.7:1 is needed if your running at cat, if thats out the equation now u can play... running lean with a cat will destroy it or definitely shorten its life. Next thing you have to worry about is your exhaust valves with or without a CAT...

Getting better mpg through doing a "lean cruise" is not a requirement for part throttle tuning, its an option...

Proper part throttle tuning simply is smooth controlled afrs, ignition timing, cam timing, etc, transitioning from vacuum to boost and while in those areas in general... This can still be done and run the car in closed loop.

 

35R helps if you are sticking out of big boost... and so does only getting 210 miles to a tank for your "baseline". If you filled that tank up at 13.5 gallons you only got ~15.5MPG for the baseline.

Open loop and ~15.5 AFR is old news and not portable. If you know the conditions you will be in and have a lot of time to invest it is cool and a neat pet project I'd like to see the results from, but it definitely isn't for everybody or even most. Assuming that same 13.5 gallons for 310 miles means you scored a whopping 22.9 MPG. I've just touched 25MPG a few times, regularly do 23MPG, and usually see better MPG than that baseline out of E85.

Targeting 15.7 AFR over 14.7 is a 6.8% reduction in fuel, but you don't make quite the same power so other factors obviously come into play. Those details play out the rest of the story, but I'm guessing that's where your big savings comes from. I'd be curious to see if you have good data about the MIVEC timing. The rest of it helps but I've found it to be mostly inconsequential in any of my testing.

In any case, more relative, relate-able figures would be helpful. Obviously all of my figures above assume things since the data isn't provided.

 

Gotta chime in here. The gains are simply not possible at steady state cruise, which is what I am assuming this thread is actually about. Maybe the OP is asking about throttle tip in and smoothness, which is what I assumed when I first started reading. Either way.....

We did some calculations, well "we" didn't cause I am stupid. I had my 13 year old son do it!

I was sitting at dinner one night with a pencil and my son, knowing I barely graduated high school (but can tune like a mad man) asked me, "Dad, what are you trying to figure out?" I said, I want to know how lean I have to run my EVO on ethanol to get the same fuel mileage I do on gasoline. He laughs, "That's easy." I tell him do it then. So now I learned something

Let me give you guys an example.

If your car gets 20 mpg on the highway at 14.7:1 AFR's if you run it at 15.7:1 the mileage only goes up to 21.36 mpg. It's something but not the astronomical changes being claimed in this thread.

If we run the car all the way to 17.7:1, which is way too lean and the car will not run smoothly there that's still 24.08 mpg from the 20 mpg we started with and as I said, I've done everything I can to make it run correctly there and it will not, it's too lean.

The gain from 20 mpg to 24.08 is 20%.

The stock ECU, if your fuel trims are correct that part of the tuning is simple. Telling someone it takes hours to dial in the part throttle cruise AFR's is nuts.

When Trent worked here we were concentrating hard on fuel mileage. He drove 62 miles one way to work everyday. When we started working it really hard he would do his best to drive easy, one way to work, keep the speeds at the speed limits exactly and stay out of boost. There is stop and go, turns, stop signs etc., on this route. I think we managed to get nearly 33 mpg on his car (GT35r, built 2 liter, 1000cc injectors, 93 octane) as a best on the 1 way 62 mile trips. That is pretty stellar.

 

Im talking about having a different turbo like an fp green/red or bbx and getting someone who knows what theyre doing to tune partial throttle like youre going to see 99% of the time youre driving. Any bozo can tune wot and bozos cousin can tune for a constant highway speed.

I want someone who can reliably tune for say 20-80% throttle under varying engine loads.

 

I'm concerned that other people are apparently using my stage name.

Rich

 

Whenever i tune these cars, that is exactly what i do. Whether its an in person or E-tune its important to cover all the cells that you can tune as thoroughly as possible!!!

CAN'T Complain about that.....

 

1800 cars a year tuned?

Good lord, anybody that knows a lick of math can figure out that is a total BS claim.

That's basically 5 cars a day, EVERY DAY, seven days a week, 365 days.

Do these tuners that make these redonkulious claims think Evom members are mathtarded?

 

David,
Best Economy for Gas is 16.2. As you go leaner, you actually make more power, so you need less throttle. You end up sucking less air and therefore less fuel. But you are correct, leaning out doesn't add that much econ. Maybe 1 mpg. Adding some timing helps too. But one has to be careful to not burn a hole in their pistons at cruise speeds.