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Sorry matey-b, but the Aero + Viggen engines are not the same. As Stan says, the Aero is 2 litre and the Viggen is a 2.3. The starting point for the Viggen engine was the 9-5 2.3 Aero engine but there are a few more differences: the inlet pipes are different, the exhaust valves are different, there's supplementary oiling under the pistons and importantly the turbo is different [bigger, better], plus the clutch is different [beefier], the brakes are bigger with 306mm slotted + vented discs, different calipers and pads and an upsized master cylinder. The gearbox has slightly different ratios [I believe?] and the driveshafts are also uprated.
Yes, the ECM programming will be different.
Plus the swaybars, spring and damping rates are all different.
The torque is higher and has a flatter delivery curve, you get it all from 2500rpm up to 4000, whereas the Aero is a little more 'normal'. This torque delivery is the clincher and makes a significant difference - I tried a 2.0 9-3 that had been Abbottised with ECM mods and was supposed to be producing pretty-much the same BHP as the Viggen, but the 'pull' was far less noticeable due to all the other engine bits being standard.
If you wanted to make an Aero go like a Viggen, better to just get the Viggen because it'd be too much of a b@ll-ache trying to get all the bits.
IMHO the Viggen would quite happily take 300BHP - mine will in a while. And the torque steer is just something for which you need to develop a bit of finesse in your driving...
:)
JohnC
'01 9-3 Viggen
'93 900 Conv
'86 900i that may end up as a stripped-out turbo...
'82 900t donor for above...
'76 99GL that nearly ended up as a 99T clone
'75 99EMS
'73 99 X7
'69 99
'67 96 2str Monte Carlo
RIP several 99Ts, lots of other 99s broken for bits, 95 & 96V4s and more SaabObelia than you can shake a stick at..!
posted by 210.50.3...
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