Datalog check

[SomnoSpeed3]

Here's a pull I just did... I know some number ranges that I should be in but am not an expert by any means. Boost looks good. Can you guys tell me what you think about my AFR? And what of those couple 25-29 spikes in the AFR... is that normal or false readings?
Any other opinions?

 

[matsuda]

Notice that in each instance of AFR > 20, the next line shows a drop in RPM. In other words, when you shift and lift your foot off of the throttle, the ECU cuts off the injectors while the RPM's are dropping. This will show up on most logging devices as an AFR > 29 (although the AFR is actually infinity).

If you can see the AFR in real time, it will display > 29 when you are coasting in gear.

The numbers look fine.

 

[SomnoSpeed3]

Thanks a lot. I thought it was shifts but did not know if those numbers were out of the ordinary.
Thanks again.

 

[Speed3Rookie]

that 12.9 at 18lbs doesn't look good.

 

[mazdaspeed32007]

you miay want to datalog less parameters so you can get a more thorough reading. it looks like its datalogging so far between the rpm ranges. the less parameters you put in the datalog the better log youll get. do like....rpm, boost, a/f, throttle, kr, fuel pres. also, what were your gears in that pull. looks like 1st through 4th? 2nd through 4th?

try pulling 1 gear at a time on data log or 2 strong gears. so do a 3rd gear pull from 2800rpm or a 4th from 2800 rpm and data log that. or do a 3rd and 4th pull. thats where the "power" sits and where the most inportant data is sitting for your car.

 

[Sport6]

you miay want to datalog less parameters so you can get a more thorough reading. It looks like its datalogging so far between the rpm ranges. The less parameters you put in the datalog the better log youll get. Do like....rpm, boost, a/f, throttle, kr, fuel pres. Also, what were your gears in that pull. Looks like 1st through 4th? 2nd through 4th?

Try pulling 1 gear at a time on data log or 2 strong gears. So do a 3rd gear pull from 2800rpm or a 4th from 2800 rpm and data log that. Or do a 3rd and 4th pull. Thats where the "power" sits and where the most inportant data is sitting for your car.

+1!

 

[SomnoSpeed3]

that 12.9 at 18lbs doesn't look good.

Care to elaborate?

 

[mazdaspeed32007]

target a/f ratio on the cobb maps are 11.x usually. probably 11.2 or 11.5 would be ideal for a WOT run at the height of the curve. when you start getting into mid to high 12's your beginning to get a bit lean. and when your engine runs to lean your into zoom zoom boom boom territory.

id say your best bet is to learn the parts of ATR you need to adjust such parameters. or pay someone to do it.

do you have an air straightener in your CAI? what are your ltfts? you may just need to mess around with your maf numbers a bit.

 

[SomnoSpeed3]

I have a straightener on my CAI, I put it on a few months ago but the car ran for nearly 30k miles without one. I bought the car with 29K on it and installed it just after my AP.
I have no idea what my ltfts are and don't know where to find them. I'm damn new at this stuff. Never had a turbo, never had a foreign car, never even had a car since over 15 years ago. Only SUV's.
I have ATR but am not dumb enough to mess with it since I don't really know what I am doing. I would like to learn but don't really know where to start.

 

[matsuda]

that 12.9 at 18lbs doesn't look good.

Look at the log data carefully. There is poor time correlation between the monitored parameters (too many parameters monitored at once).

In other words, it wasn't 12.9 @ 18 PSI.

 

[SomnoSpeed3]

I'll take it out again on Sunday and do another log. I'll do a 3rd gear pull by itself and make it a little more specific.
Thanks guys.

 

[matsuda]

I would make one suggestion:

Since each logged parameter takes a certain amount of time to process (request data from ECU -> wait for ECU to respond -> read data), you may want to limit the number of parameters. For example, if you want to check the AFR, log only RPM, boost, and AFR. This will minimize time differences between the individual readings and give you a better idea about what is really happening.

Unfortunately, it's not possible to read boost and AFR (for example) at exactly the same time. That's why it's better to log only a few items at a time.

 

[SomnoSpeed3]

I will do just that. Thanks a lot.

 

[Speed3Rookie]

Look at the log data carefully. There is poor time correlation between the monitored parameters (too many parameters monitored at once).

In other words, it wasn't 12.9 @ 18 PSI.

i see what you mean. thanks for clearing this up for me.