NefMoto

Hi Guys

OK with my limited "software" tuning experience I have played around quite a bit with my turboed A4 now and once I acquire my S4 I would like too obviously squeeze as much potential from that awesome v8 as possible. Now when tuning a turboed car its mainly about achieving extra boost and that with optimal timing/fueling gives great increases in power, so with a NA motor whats the best way too tune them?

Not much really.

For one, aim at going richer and getting "best power" AFR which is around 12:1.
Secondly, advance timing to a bleeding edge of what motor can take.

That's it. And no, V8 is not that awesome (only saying since I have V6 with turbos :))

Build a RS4 motor.  DTM-style intake, larger intake manifolds, port/polish of cylinder head, lightening and balancing of the bottom end, dry-sump oiling, pulley reducers, lightweight flywheel / balancer, camshafts, valve-springs, fast-velocity headers, titanium exhaust, built fuel system.

Build a RS6 motor.  Heavy-duty clutch, lower compression ratio and connecting rods (?) re-build, rs6 turbo headers which probably dont fit thus requiring custom exhaust plumbing for the turbo, single versus dual-turbo decision, inter-cooler plumbing, water-meth plumbing, ecu reprogramming, etc.

Buy the APR Supercharger kit for $15,000.

Buy a Stage 3 B5 S4 Avant for $15,000.

thanks guys

Octane and timing

get the .bin id be willing to help you on this

Sorry. The NA v8 isn't very responsive to tuning. Even with an SC it really isn't built for higher cylinder pressures.

Get an audi with a proper motor.

lol, you are harsh

Moral hazard man, moral hazard.

I was looking for proper Cayenne 18Z rotors and wound up on the B6/B7 AZ forum.  Racingbrake apparently is making some bolt-on rotor and upon realizing they were planning on building it for the B6/B7 chassis, I wrote on the post:  "You should really make this rotor for a non-POS chassis.  This thread sucks."

LOL...  sorry OP.  TBH, I'd LOVE to build up a new 3.2 V6 into a single-turbo monster to be put into a B7 RS4 body...  <drool>

A pretty ignorant statement....  Honda's weren't built for higher cylinder pressures either, but they work VERY well.

And an Audi with a proper "motor" would be an I5 vehicle.  Hope you weren't hinting at the inefficient 2.7tt.

I5 >> 2.7tt > v10 > 4.2tt > 3.0sc >> 2.0t > 1.8t > ..............................

way way down at the bottom somewhere is the NA v8 used in the S4, RS4 and S5

honda motors work just fine with high boost; you just have to build the motor.

2.7t and I5 don't need any internal work. stock block + internals are just fine.

I think we can all agree the I5 is definitely a proper motor.

Your list is right on spot with what I'd say!  I just don't understand why the V8 doesn't seem to repond well to boost.  Usually, engines that make decent power in N/A form have significant gains from boost.  Maybe it's poor tuning in their case?  Not sure.

As far as The Honda's go, internals are certainly advised however my friend had a bone stock 170k miles GSR with a GT3076 slapped on it and made 501whp.  Then went to the track and ran back to back 11.1's @ 129mph.  Who knows how long it would last like that though.

I <3 my I5!

beast

http://nefariousmotorsports.com/forum/index.php?topic=1294.0title=  ;D

this will be my first v8 I have ever owned, one of the other bigger capacity cars I have owned was a 1989 325is (m3) and I loved the sound/power of the 2.7l straight six bmw motor since then its been a mixture of audis 1.8ts and a freelander v6. My current 1.8T is pretty strong but its at the point now where I will need too go BT to get more power where as the s4 stock has more kw than what my modified 1.8T has, although the 1.8T does feel faster I have fallen in love with the deep grumble of the 4.2l V8. I have been modifying cars and bikes my whole life so its not going too take me long too start modifying the v8. In my head its probably going too be intake, branches, exhaust, cams and as with every other NA motor I am sure those mods will release some hidden potential in that motor. 

I'm interested in following the tuning of this.  Keep us updated if you get it.

cant read the ecu on the car for some reason  :P

Not really.

So your saying that the 2.7tt is better than the v8 twin turbo found in the rs6? Why is this so?

ease of maintenance :)

pulling the motor for a turbo swap is one thing. pulling it for an O2 swap...

but in all seriousness, i love the 4.2tt, but my heart still yearns for the v10 and i have a soft spot for the 2.7tt

What year?

I would say the v10 5 liter twin turbo in the new rs6 over the 4.2 v8 twin turbo however I have never worked on either only the 2.7tt however I can imagine a lot more ponies from the other two...

I really lusted for those cars.  Until every RS6 I looked was found to be burning oil.  :(

sorry to dig up my old post BUT i have finally managed too read the file from my NA v8, the file is NOT stock however and I have a couple of questions. From my 2 stroke bike days too increase low end torque we would increase timing ie more timing more torque. Now this modified file on my NA v8 looks like the tuner has lowered timing which doesnt make sense too me. I am battling too find the fueling maps like LAMFA in the file so cant really tell whats been done to the fueling. Also KFMIRL has been lowered but IOP has been increased  ???

my current tuned file

http://nefariousmotorsports.com/forum/index.php?topic=1932.0title=

Timing has probably been lowered as the the timing is very aggressive out of the factory, at least the European spec is. 

LAMFA is 26DC0 15x6

thanks Rick, about the timing surely to make more power more aggressive timing is needed?

Yes, but if you are already at the knock limit then you can't run more timing. 

cool I am just surprised it comes out the factory like that. I will log timing today and see what is what.

Anybody able too see what these maps are near NMAXGA

Why? Thats what knock sensors are for.

And, incidentally, why aftermarket tuning a modern NA motor is generally a waste of time.

well for me its more about the exercise and I want too get my car running at its optimum and would also like too make the drive a bit more aggressive too me it feels like the torque monitoring is reigning in this big beast quite a bit.

I doubt it.

really? for a car that has 255kw stock you would think that in first and second gear going WOT would get a much more aggressive response from that beast my old 89 model BMW 325is which was 155kw you would constantly have too baby the throttle and be very careful on when you went WOT or have the car facing the wrong direction, now I know you cant really compare a quattro vs a rwd BMW but I would have thought that responsiveness of the motor would be much stronger in the v8?

I doubt it also, do a log of block 20 on WOT along with the throttle position (not pedal) and that will tell you everything.

will do

yup you were right, so far throttle plate angle and pedal position do line up but that was for a 3rd gear 2000rpm too red line run so will do some 1st gear 2nd gear pulls and see what the throttle/pedal and load is doing. you were also right about the timing getting a couple of degrees timing pull.

You might be able to get a few degrees if you richen the mix a bit.

I doubt you'll pick up much HP though.

You'll need a dyno for sure (to measure the very slight increases), otherwise you'll just be guessing.

They do pick up power with a richer mixture.

thanks guys will play a little and see, she is not slow thats for sure and I guess I should be happy with the power

Next time get a motor with FI :)

S4 does respond to tuning, better than the RS4.  Filter, full exhaust, map gives a good gain.  Then move onto inlet.

Hi Rick

I have a filter, exhaust with x pipe currently still stock inlet though.