MazdaManiac

iTrader: (3)

Yes, it will, but you have to rub it on the affected area along with some buttermilk.

Yes - you will want to go through this procedure on the boosted applications to establish smooth running in and out of boost.
The boosted ranges (calculated loads above 1.00 or so) will fuel correctly even if you get this method wrong.

Cam

iTrader: (1)

How would a custom tune (or semi custom tune) work? Say I load one of your maps, my trims are way off. Can I email you the datalog and have you tweak the tune to correct it, or would you have to do it in person?

Does the AP datalog or would I need a seperate device/program for that?

Would a tune tweak of this nature be included in the subscription service or something paid for seperate?

MazdaManiac

iTrader: (3)

Each of the basic calibrations that I ship comes in a spread of different trim levels. You keep trying them until you find the one that fits.
Its like when you go to the eye doctor. He just keeps trying the next lens until he finds the one that works.
If there are specific problems that need to be fixed, then we could go to a custom tune.

ChattyRX8

Since the output of the OMP can be changed, are you still pre-mixing?

MazdaManiac

iTrader: (3)

Yes, but considerably less.
I agree with RG's assessment that the afterthought by Mazda in putting the third oil squirter in the '09 model is to cover the *** of the other two nozzles.
A little pre-mix makes up for that in our older motors.
I only add 4 oz now.

With my current OMP mapping, the motor consumes about 8 oz (1/8 quart) of oil every 250 miles.

ChattyRX8

That's not too bad I guess... unless you're getting considerably less than 250 miles per tank.
Are yo currently on backorder for your PO's, or do you have any units that aren't spoken for yet?

MazdaManiac

iTrader: (3)

I consistently get 200 miles per tank unless I keep it at an absolutely constant speed on the highway.
If I was getting more than 250 miles per tank, I'd want more oil.
All the APs on my current PO are spoken for, but I will be making a second PO in two days.

Derex'8

iTrader: (4)

Thats how much I gt per tank and I'm not even FI

Corentco

Hey MM,

What sort of gains can we expect from your NA Stg 2 map. Will it work with my K&N v2 and Supercat/Greddy exhaust? Will there be an econo map (I know pretty lame, but thought I'd ask)? As well are you shipping direct to Canada? I'd love to pick one up from you with the additional maps.

Thanks

mysql

Jeff, I was curious how the flash works for fi use. Is it as simple as adding more fuel for more airflow past the maf or is there more to it?

morkusyambo

How is it that Cobb has been able to do this for not only our cars, but Subies, Mitsus, and now even the new Nissan GTR???

They must have a bunch of serious nerds working over there. hehe.

Red Devil

Did you have a specific fuel:oil ratio you targeted with adjusting the OMP? Such a great feature that Cobb allowed in that...

EDIT: D'oh, question answered on previous page.

tdiddy

I don't understand much of what Jeff is doing but I am trying to learn so I am going to get in on this conversation...

I am pretty sure he is using mathmatical equations to calculate the values for multiple different variables. One variable he is calculating is the VE(s). The three main variables in calculating this are Engine Speed, Mass Air Flow, and Intake Air Temperature.

I think he is also calculating the Required Injector Flow Rate. The main variables in calculating this are Mass Air Flow Rate and Air Fuel Ratio. There is also probably a Brake Specific Fuel Consumption calculation going on and he is definately doing some pressure and temperature calculations.

The hardes part is being able to get all of these calculations into common units. For example, Brake Specific Fuel Consumption is claculated by dividing the Fuel Rate in g/hr by the Power in kW. The Power is calculated by taking the RPM * Torque in Nm and dividing that by 9549.27. In addition to this, the BSFC can be calculated in US or Metric.

Hopefully, Jeff will elaborate more...

MazdaManiac

iTrader: (3)

The OE PCM uses a combination of MAF, BARO, IAT, ECT and APP/TDC to come up with a numerical value that represents the load on the engine at any given moment.
This number is then used as an axis on all the fueling and ignition tables, referenced against RPM. (Different subsets of tables are selected as a reference to vehicle speed as well.)
There is a preprogrammed limit on this number that the PCM expects to see. If you exceed this limit, a default value is locked in.
All of the OE tables run out at the preprogrammed limit.
In an FI application, we can expect to see significantly more of this "calculated load" than in an NA setup. Therefore, we extend the limits, lengthen the tables and come up with appropriate A/F targets for these new load limits.
Then, everything is rescaled to utilize this new load range in such a way that it is incorporated seamlessly into the regular load range.
Of course, as you can probably imagine, the relationship between load and manifold pressure isn't linear - or even regular - so deciding what is and isn't boost is a bit of a trick since the target A/Fs for these two "ranges" are significantly different.

Then there are the complications of accommodating the variety of intakes (which FUBAR the MAF), injector sizes (which change the scaling) and the little detail of altitude.
In a normally aspirated setup, the OE PCM does some interesting things with the BARO. In a boosted application, this has to be handled a bit differently.

This was a gross over-simplification, BTW.

morkusyambo

Don't misunderstand me, I am going to purchase this product and I am excited that Jeff is doing the tuning.

BUT, could someone explain to me in some detail how I can plug in a map for my positive displacement blower and expect it to work without having first been tested on this type of application.

Don't worry about using big words and scientific mumbo-jumbo...I can follow.

morkusyambo

Speaking of intakes that FUBAR the MAF, any ideas as to how the AP will work w/ the new Pettit MAF housing? Whether its good or bad in your opinion, and what we may have to do to make it work?

MazdaManiac

iTrader: (3)

First of all - it IS being tested on your application. The map for the Pettit is a Pettit-specific one, not just the general FI calibration. You aren't the only Pettit owner I know!
Second, the main concern with the Pettit is just the idle. Once it is in load, it is fueled just like a turbo.

I am scaling the MAF in the calibration for the new MAF housing.
It will suck like all aftermarket MAF housings do, but its nothing that can't be accommodated.

r0tor

iTrader: (1)

so any chance for the NA maps on getting by with 89 octane like i use to when I had the cz tuned to ~13.0 afr and factory timing (or a little advance)? Or are the maps going to be a tad more aggressive then that?

NaarLeven

I might plan on modding my accessport. Rewire it to a larger screen?

Wonder how long before I start taking it apart ha.

\\Konig\\

iTrader: (4)

so realistically MM, are NA users with no cats going to actually feel the difference after the reflash? or will it mainly just be seen on the dyno numbers? or will it differ greatly from one rx8 to another...?

i think i have too much time on my hands, i check this thread way to many times in one day haha...

morkusyambo

Thanks. While its true you may know more than 1 Pettit owner(in an other than adversarial way), you may find i'm one of the few who are willing to admit it in public.

davefzr

From my experience with working with the Int-x, you can definitely feel the difference. When I had it installed on my car, 3rd gear had just as much pull as second gear does now. The feel of the car is completely different. I am sure that others can comment further if they have the AP installed now, but from my perspective, it's pure joy and I cant wait to feel that again.

MrWigggles

8 oz is a 1/4 quart. Or did you mean 4 oz which is 1/8.

-Mr. Wigggles

eviltwinkie

MM...please ensure that the AP ships with a "Valet" map...

Fawking parking dudes..

MazdaManiac

iTrader: (3)

No, I meant 8 oz. I've got it CRANKED!

You know, the literature mentions this mode, but I don't know what that is.
I've been mostly concerned with performance - I haven't bothered with bells and whistles.
I'll research that, but worst case scenario you can download whatever that mode is from Cobb.