+1 You can expect a software mod to add around 10-18 HP to the gas/petrol V8, if you add a complete exhaust (with downpipes) you'll get about 10-12 (maybe 15) more with no other tuning or mods. Very doubtful that a software only mod would (or could) do 400+ HP.As far as I know, that engine is completely incapable of putting out 400hp+ with a simple software mod. In fact, I don't think anything short of a complete rebuild will yield 400hp+ with that engine. You can get somewhat close by going all out with mods, but I don't think it can get there, especially with only software.
No, completely different engine. There's a whole other computer in R8 and RS4 to handle the changes (specifically, the calculations needed for the increased redline) made to the lump.Dealer told me its not Audi's software.. but some other company.
Isnt the engine like the one they put in the R8 and the RS4?
Haha I will write you more right after I talk to them and get more info about what they are talking about.No, completely different engine. There's a whole other computer in R8 and RS4 to handle the changes (specifically, the calculations needed for the increased redline) made to the lump.
Trust us, a software update WILL NOT give you 400hp from the S5's 4.2. The dealer's talking out of their @ss.
Lol if you consider the G37 even comparable, you should definitely go drive one. I test drove one like 2 weeks ago, and it's miserable. Most commonly, it is doing 0-60 in 6.0-6.2 seconds which is a full SECOND slower than the S5. Mostly because it is 3800+ lbs and only has 250 ft-lbs of torque (more similar to the A5).One thing i dont get is..with 4.2L and a V8, why do they only put 354hp on the S5....even G37(v6) has 330 hp, M3 has 413 hp. My guess is they dont want to create too much competition for the future Rs5...
'I did some searching. Between the R8 and the RS4, there isn't a lot of difference -- same 4163cc motor, bore and stroke is 84.5mm x 92.8mm. One notable difference is that the R8 runs a dry sump oiling system, whereas the RS4 uses a traditional oil pan. Visually the intake manifolds look different -- I've not seen the R8 motor up close, but it's reasonable to believe that it uses independent throttle bodies, which add response, but do not affect overall power.
Comparing to the S5, the most notable difference is that the S5 runs an 11:1 compression ratio, whereas the RS4 and R8 are running 12.5:1. Their bore and stroke are identical (84.5mm x 92.8mm) which indicates that the cylinder geometry and rod geometry are also identical, and the difference in compression is caused by a difference in piston dome shape (or head gasket thickness, which is a lot less likely). Because the high comp piston was already a production piece, it's a pretty safe assumption that the lower compression piece was produced for the purpose of marketing, as stated above, so as not to clash with either the B7 RS4 or the upcoming RS5. So in theory, I can't see anything mechanically wrong with putting RS4 pistons in your S5 to achieve a bump in compression, which typically causes a significant increase in power across the entire powerband (and ironically an increase in fuel economy). The RS4 might have additional compensation in the fuel map, so I'd probably want to run an RS4 ECU and look into fuel injector differences in conjunction with this mod, just to be safe. On the other hand, being at 11:1 puts you in a better position to upgrade to forced induction, if you so desire.
On a side note, it's also noteworthy that the 3.2L FSI in the A5 already runs 12.5:1 so that amount of static load seems to be 'normal' for mass produced Audi components.
Definitely true that the stock S5 timing map may be too aggressive for 12.5:1 but that's something that could easily be tuned with a piggy back device or ECU remap. I doubt the S5 is any less sensitive to knock sensor signal as the A5, which already runs 12.5:1.'
Ray, great research and a really informative post. You make some good points about the engine's inherrent ability to handle the higher compression... maybe a good modification to think of once out of warranty... pistons or head/block skim... Must talk to APS!!
...Of course as I understand it, the negative of higher compression is the greater tendency to 'knock' and therefore the ECU must reduce the timing advance and compensate fueling, which reduces the available torque and limits the power gains.
Mind if I ask where you are coming up with these numbers? The G37 has 270 ft-lbs of torque. Also, most car mags have had the G run 0-60 between 5.2-5.4s.Lol if you consider the G37 even comparable, you should definitely go drive one. I test drove one like 2 weeks ago, and it's miserable. Most commonly, it is doing 0-60 in 6.0-6.2 seconds which is a full SECOND slower than the S5. Mostly because it is 3800+ lbs and only has 250 ft-lbs of torque (more similar to the A5).
I stand corrected on the torque. As for 0-60:Mind if I ask where you are coming up with these numbers? The G37 has 270 ft-lbs of torque. Also, most car mags have had the G run 0-60 between 5.2-5.4s.
Ok this is my opinion, which shouldn't affect how much you love Infiniti...What exactly is so miserable about the car? For the price, its the best deal you can get for that kind of power, looks, and luxury...as u can see, I am a fan of Infiniti