Airboy tuning

Airboy tuning .

01/24/2024

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Nice to find my dyno picture stolen and used in another website that sells used dynos.
12/08/2020

Nice to find my dyno picture stolen and used in another website that sells used dynos.

Another example of (2011) STi with upgraded fuel pump (in OEM pump holder/basket) losing fuel pressure at high RPM. At 2...
11/09/2020

Another example of (2011) STi with upgraded fuel pump (in OEM pump holder/basket) losing fuel pressure at high RPM. At 20psi fuel pressure started to roll off and as RPM climbs, the pressure drops more rapidly.

With the fuel pressure sensor wired in, the ECU was able to "see" this happening and try to compensate by increasing the injector pulsewidth. I use "try" because the compenstion will only work until the fuel flow (L/hr) reaches its limit. The flow limit depends on how bad the leak is inside the fuel pump holder. The compensation is meant to serve as early warning rather then a "fix".

This highlights the important role that the pump basket plays in the fuel system. It is more than just adding fuel pump and injectors when it comes to adding fuel capacity.

In a few days, my 2006 WRX will be 14 years old. Still ticking after roughly 275,000km and 5 turbo swaps. It has taken ...
03/31/2020

In a few days, my 2006 WRX will be 14 years old. Still ticking after roughly 275,000km and 5 turbo swaps. It has taken me North to Fort Simpson (NWT) and South to Flagstaff (AZ).

What is the longest that you have kept a car, and do you still have it?

01/02/2020

Pre-purchase suggestion:
In addition to the usual inspection for fluid leaks, cylinder compression and leak-down, etc, if the seller mentions that the car was tuned at a particular shop, request supporting documentation. This could be a print out of the dyno chart or invoice. If the hard copies are lost, have the seller contact the shop and obtain replacements.

09/29/2019

Borg Warner, I am disappoint.

Hmm that is not a Japanese import. The "shop car" from (2013 ML63 AMG) getting some custom tuning done. Stock other th...
09/27/2019

Hmm that is not a Japanese import. The "shop car" from (2013 ML63 AMG) getting some custom tuning done. Stock other than drop-in filters.

09/19/2019

Finally had some time to put my 06 WRX (273,000km) back on the dyno. Gen II GTX28, ID1050x, Flex Fuel (E74), Aquamist M**h injection (installed around 2009)

How much smoke will oil in a muffler make? Lots and lots. And lots. Subaru and va**ng. There, done. No need for more va*...
06/08/2019

How much smoke will oil in a muffler make? Lots and lots. And lots. Subaru and va**ng. There, done. No need for more va**ng comments.

271,000km on the odometer of my 06WRX...perfect time switch out the 750cc injectors with some ID1050x, add Ethanol Conte...
02/13/2019

271,000km on the odometer of my 06WRX...perfect time switch out the 750cc injectors with some ID1050x, add Ethanol Content Sensor and go Flex-Fuel.

02/05/2019

Some Winter thoughts...

1) Engine oil take longer to heat up than coolant. Even longer if the under tray is missing.

2) PCV valve can freeze, AOS drain hose can clog, especially with sustained highway driving in extreme cold temps. Subaru with FMIC should block off the hood scoop. Ones with TMIC could block off part of the TMIC above the PCV valve.

3) Boost creep (high boost even with fully open waste gate) will happen at full throttle and mid to high rpm

4) Cold air has higher density (more oxygen per volume). More power? Yes, and also more fuel required. Going from +20C to -30C, air density changes by ~20% so fuel demand will also increase by ~20%. Stock fuel systems in STI/WRX or EvoX will see ~90% max injector duty cycle (IDC) at +20C so, it doesn't have the headroom for high boost at -30C. Boost creep from (3) above adds to the problem. If that doesn't sound bad enough, the 90% IDC number is at Calgary elevation (3500'). Air density increases at lower elevation....

Exercise caution...

Continuing with the Fuel Pressure topic...if you have a Subaru with 32bit ECU (04+STI, 06+WRX) and a Version 3 Accesspor...
02/04/2019

Continuing with the Fuel Pressure topic...if you have a Subaru with 32bit ECU (04+STI, 06+WRX) and a Version 3 Accessport, you can add fuel pressure monitoring and more importantly, compensation. While it won't prevent fuel pressure problems, excessive compensation values can serve as an early warning.

Example charts with falling Differential Fuel Pressure (should stay ~45psi) and the resulting compensation to injector pulse width by the ECU.

The additional pressure sensor is wired into the ECU via one of the TGV sensor inputs and custom map changes are made to activate this feature.

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5720 1st SW
Calgary, AB
T2H0E2

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