Quote:
Originally Posted by Jaden
I got a little over 18 mpg on this tune for the first tank, almost 18.5, I drive HARD...
Typically I was getting around 17 or a little under driving a little less hard than this trip, so it does get slightly better mileage...
A side note, my car's mpg readout was almost DEAD on at 18.3...(181.4 miles and 9.78 gallons).
Which is unheard of for me on E85...I don't know if there was something about this tune that allowed the readout to be more accurate but it has always been about 5 mpg higher reading in the past.
The tune works well for me. I get the same fuel as the op though as we live close to each other and we both have A01D's.
Where I get my fuel it's guaranteed to be above E70.
I took long logs doing multiple types of driving and there doesn't seem to be any major issues with the tune...
That doesn't mean it's the best tune for me, for the op, or for anyone else for that matter, but come on guys, there's no need to rip the op like some of you have.
Jaden
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Couple of things would concern me (note I am no tuner just do some reading and testing)
Your giving your car a hard time rpm 6000-7000 before the coolant and oil have reached operating temperature.
you have not logged ignition timing so we cannot see what overall ignition advance your running
you getting a small amount of knock once the car warmed up to operating temp at lower rpm
The engine load values seem low so im guessing your in lower gears doing those pulls like 2nd or 3rd
The measured afr is around low 11 when your higher rpm where commanded afr what the ecu is asking for is around 12, ie your running 10% richer than whats in the tune.
So the Open loop maf scaling is off a bit for your car, this will likely suppress and knock
We have found that running that rich looses power on dyno, you want to be aiming for low to mid 12 at upper rpm on E85 as per the OL Fuel Table, but with your extra timing that might cause issues. Tuning is a balancing act between lots of factors
Ignition timing
fueling
cam timing
injection mode
ect
Myself and wayno have found shiv's basic tunes to be very good.
The only things we had to tweak was fueling via correction to maf scaling , due to the differences in maf sensor performance between vehicles and as a result we had to adjust some load limits.
We pulled a bit of timing at lower rpm where we saw slight knock under extreme circumstances like on track on hot days. We did not try to be too "smart" or get ahead of ourselves making changes. We just tried to make the tune run as the original tuner wanted ie it follows the fueling tables.
This worked well and at local dyno days these slightly tweaked OFT tunes performed very well even compared to local pro tuners full dyno tunes, infact they beat them consistently on petrol and E85 on multiple cars.
But the credit really goes to the OFT guys for producing a good basic tune which was open and allowed us to learn and correct the tune for differences in maf sensor hardware between cars (or cars with aftermarket intakes) not the tune itself, we are just getting the tune to run the fueling the original tuner ie shiv intended.
Most of the other changes are utility changes for
fans
safety high iat and coolant temp ignition retard retard
easier starting on high E% E85 our stuff is almost E90 consistently
quiet start up
ect
the MPG readout was corrected as the romraider guys td-d found the fuel multiplier offset table which has been increased by 33% same as the injector scaling increase for E85 .