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VS M4.4 tuning dead? Start again here?

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
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A1304
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Year and Model: S 70 T5 1998
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Re: VS M4.4 tuning dead? Start again here?

Post by A1304 »

I don't use VAST's WBO2 modulation.
The "14POINT7 SLC Free 2" manual doesn't have any calibration information, but there is a screen with AFR readings. I compared the readings in TUNER Pro.
My catalytic converter is removed, and the O2 sensor is in place of the rear O2 sensor.
It's further away and colder. The readings were around 15-15.3 AFR. I changed the formula, and the readings became 14.7 (((X* 0.0196078) - 0.2)*2) + 10.4-0.7).
The readings may not be accurate, but they will be across the entire speed range.

English is not my native language, I apologize for the inaccurate translation.

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Chuck W
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Post by Chuck W »

My old SLC Free has the same thing. My Spartan 2's output a couple of calibration voltages on start-up, seeing as there is no native visualization to the unit.

I'm guessing you have your own programming for the modulation, so I don't know how you're handling things and how you're using the AFR values.

Why is your O2 sensor so far back? You could be getting some oddities from that, regardless of what the readings are.
'97 854 T5 - Manual Swap/M4.4/COP/NA cams/P2R Brakes/16T/ chassis bracing/ XC70 nose swap
'97 855 GLT - Hers. RN swap/16T/COP/VVT/exhaust/302s/Flashed M4.4/ chassis bracing/ 2 kid seats
'78 GLE - Waiting in the wings. Future whiteblock/T5 swap.

The Others- '83 TBird turbo, '85 Mercury Marquis LTS (1 of 134), '86 LTD Wagon, '81 Granada GL, '76 Beetle, '93 F-150 I6

A1304
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Post by A1304 »

Yes, the oxygen sensor needs to be moved closer to the main O2 sensor. That's in the summer plans.
The "14POINT7 SLC Free 2" has two outputs: 0-5 volts and 0-1 volts. I wanted to connect the 0-1 volt output to the main O2 input and screw in the LSU-4.9 oxygen sensor instead. It didn't work with the O2 controller ground; most likely, one of them will work.

S23  
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Year and Model: 1997 Volvo S70 T5
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Post by S23 »

Hello. It is possible to read bin from M4.4 by a K Line ?

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Chuck W
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Post by Chuck W »

S23 wrote: 06 Jan 2026, 11:59 Hello. It is possible to read bin from M4.4 by a K Line ?
Nope.
'97 854 T5 - Manual Swap/M4.4/COP/NA cams/P2R Brakes/16T/ chassis bracing/ XC70 nose swap
'97 855 GLT - Hers. RN swap/16T/COP/VVT/exhaust/302s/Flashed M4.4/ chassis bracing/ 2 kid seats
'78 GLE - Waiting in the wings. Future whiteblock/T5 swap.

The Others- '83 TBird turbo, '85 Mercury Marquis LTS (1 of 134), '86 LTD Wagon, '81 Granada GL, '76 Beetle, '93 F-150 I6

S23  
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Post by S23 »

Thanks for reply ;)

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Post by rkam »

The last 64k can be read like M4.3.
32k-64k in first half is possible with higher voltage.
First 0-32k require short circuiting an address line and reading 32k-64k.
So not very practical or safe, but not totally impossible.

A1304
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Post by A1304 »

What parameters and maps affect the speed of STFT regulation
how to increase the injection time the VE card is not very effective.
Image
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STFT .jpg

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