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TME 'did' my ECU nearly 2 years ago and I am very satisfied with it. No errors, no service problems. Dealer doesn't even notice it's been modified.
On the S/V40's you don't have to worry about the transmission getting overloaded as both the manual M56 and automatic AW52 are identical to the gearboxes found in the S/V70 and now S60/V70 where they have to cope with much more power from the 5-cyl engines..
In the case of my T4 the ECU tune actually fixed several of the well-known early-T4 problems like odd idling behaviour when hot and such.
I can only describe the T4 behaviour.. A tuned 1.9T (or 2.0T) still won't have the most power up high in the rev range, but around the middle, unlike the T4.
Power delivery is smooth and moved a little downwards in the rev-range, which makes it easier to drive in busy traffic.
It's a great feeling to drive at about 50% throttle in 3rd gear, let the revs climb to about 3500 and then steadily increase thottle to about 80%, see the boost rise and feel it really grapple for grip (LSD to the rescue). Then you're catapulted away.. Overtaking time is measured in 3 or 4 seconds!
I do recommend getting a good exhaust as well to really get the full benefit of the power increase across the whole rev-range. The stock exhaust becomes a problem above 5500 rpm under boost where it tends to bog down.
I always run my T4 on 98RON octane and drive it hard (it regularly sees 130+ mph) and so far it seems to like it just fine.
I have not had my 2.0T 'done' yet, but I probably will.
Bye, Arno.
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