MAF (most street cars)
For most street cars I keep the MAF. It helps drivability — the ECM sees real airflow through the sensor, and day-to-day manners stay predictable.
How I tune
The approach
A great tune makes your car drive right — not just make peak numbers. Here’s how I get there on GM platforms with HP Tuners.
- 1 Reliability
- 2 Drivability
- 3 Performance
Airflow, dialed in tight
I work inside GM’s dynamic airflow model — the VE table and MAF blending together. The goal isn’t a “close enough” map. I dial airflow to tight margins so the ECM’s predictions match what the engine is actually doing.
When airflow is right, everything downstream gets easier: fueling stays consistent, transitions feel clean, and you’re not fighting the computer.
Fuel trims that stay healthy
I keep fuel trims healthy and positive-leaning, and consistent. Stock GM calibrations are often conservative and inefficient in places — I look for where the factory left room and find efficiency without making the car lean or unpredictable.
In practice: healthy, consistent trims mean the closed-loop system isn’t constantly correcting a bad base. That’s drivability you feel in traffic, not just on a pull.
Limits in a reasonable range
I don’t max out every limit in the ECM just because a cell goes that high. Fully pinned values can confuse the computer.
Example from experience: the GM ECM’s max torque request is 640 lb-ft. A lot of tuners set it to the absolute maximum. I set 639 — because a fully maxed value can push the ECU into limp mode. Small difference on paper. Big difference when your car suddenly won’t pull.
Why I don’t chase every last degree of timing
Extra timing can show a small dyno gain. It also adds engine stress. Unless you’re on a dedicated race motor, that usually means more maintenance and more ways to break things.
I’d rather leave a little on the table and have a car that starts, idles, cruises, and pulls hard without living on the edge. Peak number last. Drive it every day first.
Speed density vs MAF
Both can work well. The choice depends on the car and what you want out of it.
Speed density
SD calculates airflow from MAP, RPM, and IAT instead of a MAF. It’s very capable. Some builds want or need it. The result can be excellent either way when the model is dialed in.
Street tune vs dyno
Most of my tunes are street tuned. A good street tune lands very close to a dyno tune — you’re loading the engine in the real world, on the surfaces and grades you’ll actually drive.
Dyno is optional. If we use one, the dyno shop bills its own rate. I don’t pretend a street session is a chassis dyno sheet; I do know that for street cars, a careful road tune gets you where you need to be.
Street session expectations
I come to your house anywhere in the Phoenix valley. Goal is about 2.5 hours; it varies by car. Bring a vehicle in good mechanical shape — no leaks, misfires, or vacuum leaks.
Remote logging
Same standards, different logistics. You capture the data I ask for, I write the file, we revise. Payment before the first file is sent. Message me first so I can confirm your setup.
Software
HP Tuners. Platforms: GM LS & LT (stock to boosted) and Hemi 2005–2012 only.
Questions about your setup?
Text or email me before you buy. I’ll tell you if it’s a fit.