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Also worth noting: the baseline pull had better conditions than the other two runs, so it is probably "overacheiving" (very) slightly. Ambient temps and IAT were lower (by about 20deg), and the ambient pressure was higher (though 0.01 is probably well within the error range of the sensor).

Regarding your 90% comment, remember this is a WOT pull. 2k-3.5k might be 90% of driving at normal throttle angles, I doubt you're WOT 90% of the time... Or maybe you are? :) I can't answer that Q about the high-RPM AFRs - I'm just taking the data, not making the tuning decisions, in this...

To answer the above question: The baseline and NA tune datalogs were both done on 93 octane fuel. I normally ran regular 87 octane when the car was stock because there is no advantage to running premium gas when the car is designed and tuned for regular. But I had filled up with 93 in...

We can take NA tune discussion to this thread where I have posted some: http://www.mazdas247.com/forum/showthread.php?123837050-A-Tune

Sorry, not sure I understand the question - stock is stock, and NA tuned is the final results of ECU flash tuning while the engine was still NA. MAF (g/s) is how much air the engine is consuming, and as a rough estimate can be used to estimate power - because you can dump in as much fuel as...

My gauge is pretty repeatable: 90 miles for the first bar, and then 20 miles for every subsequent bar. About 300 miles a tank.

Still on stock injectors. AFR hovering around 10 during WOT, pretty rich.

Random datapoint here, but whatever... I was looking at my datalog that I took this morning, then went back to some of my old logs out of curiosity. Maximum MAF (g/s) values that I saw: Stock: 138g/s NA tuned: 153g/s turbo, "as close to 0 boost as possible": 167g/s "As close to 0 boost as...

Haha, living in TX - the vent installation location was never even on the list. No way I'm giving up that cold air! I think I'm going to do a custom pod to the left of the instrument cluster.

Keeping with my reputation for professional work, here is my latest addition: AEM Failsafe AFR/boost gauage. Give me a break, it's working, and I have to be up for work in under 6 hours...

Pro photog + overdone photoshop + body kit = more interesting looking in this picture than it actually is. Barf. That is some sick menage a trois of Honda Fit grill, WRX lower valence, and JC Whitney accessory catalog.

That's excellent info, thank you.

Hard to say (I've never driven a 2.3L), do you not have a local dealer where you can take a test drive? We will only be able to tell you so much, it is your butt-dyno that will have to make the judgement call.

Can you expand on your comment that the 2.5L is a strong engine, especially compared to the NA 2.3? You are not the first one I've heard say that, but I've never really asked what aspect of the 2.5 makes it so much stronger.

yes, the immediate and significant low rpm power is what finally swayed me away from the k04. I was considering the BNR S1 at $900 as an intermediate option because it has a larger WG compared to stock k04 and controls boost better, but the small size and quick spool characteristics of the k04...

Yes, driving right now. Daily driver. Starts and runs fine, totally normal. Not making boost while initial tuning is being done. Stock ECU, has been (and continues to be) flash tuned.

Thanks for the constructive addition to the thread, OV. /s Yeah, $160 is high, but: 1. Technically it's not for just the sensor, it also includes PnP wiring harness connectors, which was a primary requirement of this build. No cutting stock harness, and easy conversion back to stock. Edge...

1. No, more power means more air and fuel (obviously). Stock injectors are about 242cc/min, I'm using 550cc/min. 550 is on the large size for my goal power, but the next common size down would have been borderline (high duty cycle required). 2. Yes, the 151 battery was kind of an impulse buy...

Attached is the cost report for the turbo. The grand total was about $4750. Actual parts cost about $4670. By far the largest potential savings is to use a stock ms3 K04 turbo: at a used price of ~$300 it would chop $1k off of the budget. I paid a bit under $100 for shipping, bought about...

Well, if you are going to get into a frontal impact, you should try really hard to make it a full frontal impact and hit your target square with the middle of the front bumper. (no sarcasm) Cars are the strongest and most protective when hit square in the middle of the bumper, where all the...