Seems to be some confusion...people thinking that a SINGLE AFR is the goal. Look at this and think of your AFR goals after tuning as being in a 20x20 map.

Here is the link to AFR goals.

This is not what I would tune towards as a goal.

 

So the value's you tune for are contained within that spreadsheet? Seems pretty rich, although rich is safe. I'm assuming those values are for dyno tuning and not street tuning, which would lean you out about half a point.

Feel free to elaborate more

 

They seem really conservative. My car reeks and bogs when my FJO shows 10's.

 

No, Rich. That is how Mazda and subsequently Apexi tuned from/to.

The important thing to notice is the obvious...what the goals are and how your cars behaves (it's much nicer with a WB!). How conservative are you? Ten percent less conservative? Twenty? Are you less conservative at idle and full vacuum then at 8000rpm and WOT?

Every journey has one thing in common...the first step. I'd start with what the Mazda engineers finished with. The AFR goals.

Tony

 

Edit: I'm not a big fan of dyno tuning. It has it's place, as does an engine dyno, a suspension dyno, etc. I like "keeping it real" and filling as many cells with a good number of samples, not to mention all the other characteristics of "taking it to the streets."

 

Putnam Park and Mid Ohio Tuning... Hee Hee

 

Okay, okay. I give in! Deal!

 

Hey Badog, Dave Barninger's going to use his FC Datalogit to pre-tune a Power FC I'm buying from KDR. Since Kim Barninger's building my ported motor, Dave will know exactly how to modify the base maps to work with my motor and ancillaries. About the only fine-tuning I'll need is to adjust the AFRs at idle speed!

You're still welcome to attend my Putnam Park March 22 2003 event as a spectator or participant. I've been copying Jason Baughman on my event announcements, so contact him. Or you can just visit my MDC website in my sig below

 

I'll bet you a six pack and a pizza that a couple of things will fall short of the above. I'll tell you why when we share that meal at Indy...since you'll be buying!

Sounds like fun. I'll probably be allowed a trip a quarter this year...and I'm planning on the Indy meet.

 

on what will fall short when Dave pre-tunes my Power FC with his FC Datalogit?

 

I'll tell you why (and you can tell me what, where and when) when we share that meal at Indy...

 

I'll have my Power FC with ported motor in the car by then...

 

BD, if I understand you correctly the sheet you linked to are the stock A/F ratios as Mazda programed for 3rd Gen.?

 

Actually, Capt. Bill, I think those may be Apexi AFR targerts from the 7.07 base map. Maybe the topic/subect title should have reflected more towards something about the target for AFR is not a single value like "11.5".

 

My stock O2 sensor has 102,500 miles on it. I was going to replace it with a new stocker due to age, but because I'm putting in a ported motor, and Greddy 2-row FMIC, with J-spec twins, 11-psi controlled with an Apex Power FC, I wondered how accurate the stock O2 sensor would even be for use with an Apex Power FC?

Badog, what type of O2 sensor should I be using? Where and how much? Will it fit inside the stock location bung on my Bonez DP?

Thanks in advance

 

Manny,

The stock sensor isn't very accurate or extremely critical...most of the time. I think a single wire from NAPA under the Bosch name would be good, not to mention cheaper than the Mazda one. You might have to get creative with the wiring, though. I run a 3 wire, heated sensor, which has 2 additional wires that are wired into IGN power. This is out of a Ford that I can dig up the part number for. A little more creativity with the wiring. Stock locations for the narrow-band are fine.

I would suggest adding a new "bung" (NAPA carries a 18x1.5 metric 'Spark Plug Extender" that works when you chop off the end a bit...2 for under $5) into your DP or the MP/pre-CAT location. DP would be prefered, before you put the sucker in the car! Location should be accessible from under the car and from the passenger side (it is possible.) This one would be used for WB tuning and capped off when not being tuned. The WB O2 sensors run ~$120 when in stock. This one you want to have "downstream" a little ways.

Let me know if you need part numbers

 

Tony,

I just want to be sure my oxygen sensor is functioning properly.

My original sensor is 102,500-miles old, and the factory only warrants them for 50,000 miles.

With a new motor, turbos, FMIC, and Apex Power FC going in, it seems prudent to replace the oxygen sensor too?

Here's a link Chuck Westbrook provided for a great deal on the OEM-style single wire oxygen sensor made by Walker Electronics. This is a direct plug-in replacement for the stock oxygen sensor. $36 is a bargain considering the price of the stock Mazda unit!

http://www.oxygensensors.com/

 

BD, do you have idea what boost levels that map is for?

You are absolutly correct about the fact that one A/F ratio is not what you want to tune for. That's why I think that while you need to do some dyno runs to get your A/Fs for top end power you also need to street tune for everyday driving. Unless you've got the bucks for lots of dyno runs.
But even then many dynos will not let you do low load runs. And even when they can I still question if it really is the same as driving/tuning on the road.

 

There is no way a dyno can be the same as driving/tuning on the road unless you have a temperature controlled enviroment for the dyno located in a wind tunnel to simulate air flow across the IC...

I plan to do all my my tuning on the street, and only use the dyno to backup my powermeter numbers and maybe get a few details on powercurve adjustments that the powermeter can not yet provide...

I've also requested the from the datalogit guys a quasi-dyno function be built into the datalogit logging features...all the data is there to calculate hp & torque across the powerband minus the weight of the car which is easily obtained @ your local truck weight station.

K

 

I believe the 7.07 map had a high boost of .80bar. My dyno chart in my sig (along with the data log next to it) was from a 7.07 based map, high boost of .83bar (AVC-R controlled back then).

 

Thanks, Tony