Twin turbo in 2004 4.2l S4?????
 

www. ringer-racing. com /product.sc?productId=57&categoryId=31

Looking like it is the right pick if i were to go with twin turbo, but i need facts:
If its gonna fit
What will fit
Whether or not i can turbo or supercharge the car for less than 5000$
What motor upgrades would i need to withstand twin turbos
Anything the would be involved in putting a supercharger, turbo or twin turbos in it.

Thank you

Re: Twin turbo in 2004 4.2l S4?????
 

The only option for under 5k would be the the PES kit, used. Putting a single or twin turbo system on the 4.2 is a more difficult task, and it will cost an arm and a leg

Re: Twin turbo in 2004 4.2l S4?????
 

Alright, thanks guys, I've been looking for a supercharger or turbo for ages, i'll definately look this up and look into installing one... What kind of motor upgrades should i get to support it, i know fiberglass headers would help, anything else important? Should i replace seals with brand new ones, and what should i do as fast as intake and spark plugs?

Re: Twin turbo in 2004 4.2l S4?????
 

just FYI...

PES supercharger is really adding only about 60-80hp over stock
VF Engineering supercharger not much different

Both use the Eaton M90, which is drastically undersized for our engines and their CFM capabilities. Basically they take about 30-40hp to run, and don't add much over stock

Don't get me wrong...they'll make you faster, but they're certainly not worth $10,000.

Do yourselves a favour and get good bolt ons. Half the cost, same performance.

• x-pipe good catback..2.5" with perforated core mufflers (like Fast Intentions)
• gutted OEM precats in your stock downpipes, or 2.5" Fast Intentions downpipes
• JHM 93 tune
• a few lightweight bits like JHM LW crank pulley, JHM LW flywheel, lighter wheels, JHM big brake kit + LW rear rotors (which drops about 40 lbs of unsprung weight, mostly rotating mass)
• JHM intake spacers to keep things cool and rocking

All that stuff will give you supercharger performance. I know a few guys with this setup running 12.8-13.2 quarter mile times at 106-108mph...i.e. stock RS4 1/4 mile times. Throw in JHM longtube headers ($2500 though) and you're adding a solid amount of torque to the equation.

Yes, lots of this stuff is JHM. That's because a) they're good and b) they've decided to focus on the 4.2 40 valve chain driven engine in the B6/7 S4. That's good news for us.

Here's a sampling

YouTube - JHM FIRST 12 second pass with a 2005 B6 S4 and a 12.97ET @109.1mph. FASTEST ALL MOTOR B6/B7 S4 V8


I've recently installed JHM intake spacers, FI 2.5" x-pipe, piggie pipes, JHM 93 tune, so if anyone wants to check that out, let me know. I took my car to VAST in Detroit. They are working with JHM pretty closely, so that's a great option for guys here who don't want to do their own work.

JHM also is building a twin turbo kit for our cars including forged internals (rods and pistons already to go). They're looking to add significant power with this kit, but don't be thinking $5000...more like $12-15k.

They do have a nitrous option...100 or 125 shot. Kit is well under $5000. Their JHM in house car with 100 shot of nitrous ran 12.4 @ 117mph :O

Re: Twin turbo in 2004 4.2l S4?????
 

2 GT35 might be too big for the 4.2l.
Essentially each turbo will be fed from half the engine 2.1l.
This 2.1l would be better served with a GT28. as a daily driver...
As for single turbo you would need bigger than GT35.
Look at what the turbo Ford Mustangs run, and maybe pick something a little lower.

The 4.2l engine have gobs of potentiel but, it's always a question of "how much are you willing to pay to play?"

I think a bi-Turbo GT28 kit for the 4.2l would be well within reach.
With aproper built bottom end, fuel delivery, cooling and tune, I would not be suprised to se a daily driver in the 11s.

Later...

Re: Twin turbo in 2004 4.2l S4?????
 

A Twin GT28 on a 4.2 would be well into the 10's if tuned properly. heck a 2.7 stroked to 3.0 with twin 28's was in the 10's last year. Let me know if you guys need JHM stuff, I am a Canadian Rep

Re: Twin turbo in 2004 4.2l S4?????
 

I'm from the Subaru family and I'm not sure how much HP I'm running but, I'm well in the 12.7 - 12.5 sec. on the quarter.

I'm kinda looking at 4.2l S4s but, I have not seen anyone try to turbo them. An audi is not cheap to begin with and then adding forced induction your always running some risk of failure when your the first trailbalzer.

I think that's why I'm on the fence about getting an S4 4.2l. I would have to do something drastic to the 4.2l to get anywhere close to the performance level of I'm looking for. There isn't much out there on the subject...

All this while keeping it streetable and daily driver with full interior...

Re: Twin turbo in 2004 4.2l S4?????
 

Before you do anything call, e-mail, JH Motorsport. Please do not jump at the PES supercharger. It sounds great but by all indications falls short of promised performance.

Do your homework first.

Re: Twin turbo in 2004 4.2l S4?????
 

Totally support this vision. Really do the homework and establish the goals. Great reply!!

Re: Twin turbo in 2004 4.2l S4?????
 

Many guys had good success with upgraded twin turbo setup on the V6 2.7L.
I have never seen superchargers comme close to turbos on the smaller displacement engines.

I just think for the amount of money the supercharger kits go for, 40-60 hps is not enough to motivate the big Audis (heavy).

I'm very curious to see what kind of numbers can be pulled from a twin turbo 4.2L V8.
low boost on stock engine or even better on a built V8 big boost. (nothing crazy, about 20-24lbs)

AWD V8 twin turbo Audi that would be pretty nice!
What do you guys think, super car terminator or what?