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VIEZU Tuning - 156 GTA - ECU remap

Hi,

Yesterday I had RR session and a 156 GTA saloon remap done by guys in VIEZU.

The 3 runs before the remap showed 182kw from the engine, which is 2kw shy of promised 184kw. I am happy Car has done 73000km which is around 50000 miles? 2002 year car!
Best run before the remap showed 253,5 nm at the wheels (294nm at flywheel-300nm was advertised) and 155,3kw at the wheels (then its around 182kw at flywheel).

VIEZU promised around 24hp increase in power and 29nm in torque.
156 3.2 V6 GTA 24V - Car Tuning, Performance Engine Tuning, ECU Remapping & ECU Remaps

Ofcourse I was not that optimistic at all.

Modifications that are done to my car-
only GTV 2.5 catless manifolds. Everything else stock.

Figures after the remap went better and better after each run. But there are 3 tries so I give you the figures that I got after final third try. Maybe if I had continued, the numbers would have increased even more-dunno. Will try again after few months, when the ECU has had time to settle in with new map.


After remap:

262,7 nm (from wheel) which is 305nm at flywheel
161,4 kw (from wheel) which is 190kw at flywheel (~255hp).

Which seem kind of low :/
But then again maybe the ECU needs just time? Like I said the performance went better after each RR try.

Graph.
https://dl.dropbox.com/u/46330482/Dy...er%20remap.JPG

Can anyone tell, what is that weird drop at 5500 rpm

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I cant see a remap on a non turbo car giving another 24bhp i'd have thought maybe 5/10 at the most, normally on a non turbo engine its all about drivability , normally you remap after a gas flowed head ect
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So you had 182kW = 244hp, and after remapping you now have 255hp, which is 11hp increase, not bad for just a remap. It's just under half of what they claim, same with torque, 11Nm increase, about a third of what they claim, I'd say they are grossly overestimating the gains to be made from a N/A 3.2.

With catless manifolds I thought you'd be up on or at least at the original 250hp to start with. Could there be a MAF issue?
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Thats what I tought also. I have catless, and after remap I get full benefits of having them, but...
Maybe there is MAF issue, how to know? I have not changed it never. But the car has done only 73000km... around 50k miles-so it should be past due, or is it?
Should I change it?
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Hard to say, most of the MAF issues are related to rough idle or noticeable power loss leading to MCSF fault. The calibration of the rolling road could also be an issue - you might not be down on power at all.
If it's not bothering you I'd leave it, if it is bothering you, you could pull a spark plug out and check the condition (due for changing anyway at 6yrs/100k km), get cam timing checked, fuel/air filters .... potentially a long check list that.
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156 , ecu , gta , remap , tuning , viezu

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