Audi S4-GASM

It seems that very few people have posted regarding nitrous. I'll be putting this on my 01 S8, and was wondering if anyone knew what our stock fueling was good to support? Also, has anyone done this ... did you do dry or wet? I was thinking of a 100 wet shot to be on the safe side, but would really like to do a dry if the injectors are up to the job. Any tips of advice on this would be greatly appreciated.

LemonA8

N20 will blow up your motor!!! How many times do you hear that when somebody says the N word.
Shall I try and state the facts.
A supercharger will Blow up your motor and so will a turbocharger if the combo is not correct.
N20 should be applied in the same manner . A; proper combination of fuel air and spark.
N20 hates multi prong plugs which are found in most Audis. N20 loves to make 100 x 10 more power when the mixture is lean. Which in turn, burns head gaskets and valves.
It's all about support fuel. I've had N20 on a 1995.5 s6, a 2001 s4, and a 2001 s8.
A Dry kit is just down right dangerous, if you had a DFI unit I'd say give it a try, but no factory ECM can handle fueling 100- 150-200 hp in an instance no matter what fuel pressure or injector size.
Direct port is also not a good idea, say one port goes lean cause the fuel pressure drops the motor will be toast.
I've had great fun, good luck and safe power with a Barry Grant type single fogger setup just behind the throttle plate. Try Jegs.com
I've seen single fogger kits that put it in the airbox induction tract. All I can say is one day your airbox will be in 1000 pieces with the air filter stuck in the headlamp because of an N20 backfire.


Nothing says oops, like a blue flame rolling over the windshield from an N20 backfire

Audi S4-GASM

I've used nitrous on several vehicles, including one closely matched to this application ... my Lincoln Mark VIII with the 32V Cobra 4.6L V8. On that I ran a 150 wet shot with absolutely NO problems whatsoever, so I'm not scared of nitrous at all.

Now, the key difference between that and the S is the high-strung nature of the S engine. The much higher compression ratio = much more prone to detonation than the lazy 4.6 DOHC. Ideally I would like to do at least 100 shot, and now I've definitely decided wet, likely in the straight-shot part of the air intake tube (which is where I had it located on the Lincoln as well). What kind of shot were you running on your S8 and what did you do for fueling concerns, or rather, what is our stock fuel pump good to support?

LemonA8

I did a 100 shot on my s8. I ran a separate fuel line with an inline fuel pump just for N20 support fuel. The fuel pressure was 48 lbs on the factory fuel system. I didn't wanna risk an unstable fuel pressure so I ran my support fuel separate. Doing so made jetting for horsepower dead on cause my support fuel regulator was set at 32 lbs. No matter what the motor was doing I knew my N20 had stable support fuel.
I triggered my setup with a wide open throttle switch.
It worked so well for years so much so that I eventually got bored with it, I even wore out a few bottle fittings.
Autolite plugs, NGK or AC Delco were the only plugs that lasted. The 2,3 and 4 prong Bosch plugs didn't like N20 at all. With N20 seems that the 2 dollar plugs did much better

Zaphod A8

Got any pictures of the setup? Seems that it might be even better on a lower output A8 engine.