I have been looking at 01-02 A6's. Trying to egt a feel for the pro;s and cons of the two motors in cars with about 100-120,000 km/
the 4.2. Pro. wider fender flares , 300 hp stock, 340 with a tune. I presume this to be the more relaible long term motor.

The 2.7 tt, Not as cool of looking exterior. Lower hp stock, possible better mileage, percieved it will be needing more servicing. 360 lbs tq!!! with a tune.

So pleae share with me which you would chose...I modded the hell out of a few Harleys...157 hp from a bike that came stock with 45. AND I DONT want to go that route...simpler is better (thus the lean towards the v
I wont be going crazy...an exhaust after the tune is even at question...so just with a tune (sub $1000) what sre the thoughts based on relaibility and cost to maintain.

 

i have the V8 version in a 2001. A V8 have a lot of torque when you leave a stop. turbo need some rpm to work. Every body who try my car the first time get surpris about the launch even if they don't press a lot the throttle. Same with the brake! V8 : No turbo lag.

2.7T, change the ECU program before the exaust. Cheaper than muffler and a lot visible on hp and torque. Look at the goapr web site. They are not alone to do that. If my next car is a turbo, it shure i will change the turbo boost with that kind of programming.

The way i choose the V8 was to try an S4 V8 an 2.7t. It end with the A6 because it is 5000$ less than an S4 and i wanted the V8.

O-100 the a6 2.7t is a Little bit faster. I already saw that number.
If you want power, buy something that come factory with power.
The maintenance of both turbo also stop/affraid me. I
drive my car really hard and i don't often need to push the trottle to the max. in winter higway can do arround 10L/100km at 118km/h and city 13 to 14.5 with fast start from corner. ESP is often in service. I prefered a V8 in a car.
Hope this help?

 

I think the paradigm has changed of late. 3-4y agoin the B5 vs B6 S4 world, the 2.7TT was the be all and end all and the V8 was fail. Things have moved on.

You could have a lot of fun with the 2.7TT with some RS6 turbos and a good tune. However, it's an engine pull for the turbo replacement.

Mod the V8 with 2.5" downpipes/2.5" exhaust ($1400) + JHM tune ($550) and you'll take 0.5 sec off a 1/4 mile run with more low end. Get a JHM intake manifold ($1000) and you'll get some top end gains too.

Certainly for the V8, JHM (www.jhmotorsports.com) are the only game in town. You also have the advantage of having a belt driven motor rather than the potentially weak chain driven thing we S4 owners have to put up with. Maintenance wise, the 4.2 is regarded as being rather bulletproof. Search for the username "beemercer" on www.audizine.com and www.audirevolution.net. He has a modded 4.2 A6 so you can see what he has done.

If it were my money, knowing what I know now having driven my S4 for 18m, I would take the 4.2 every time. And if you really want to go ***** out, there's a supercharger kit for about $9k (although I'm not sure if JHM can mod it for the A6) which will give you a 400awhp monster cutting low 12 1/4 miles. That's faster than a V8 R8 and getting close to a V10 R8!

 

I am on my second C5 A6 4.2, so you know my answer. Just cant beat the widebody, and the option to swap in RS6 body parts.

Just be prepared for the transmission to die on you, if it hasnt been previously replaced. I have gone through two of the tiptronics (one per car), and am now running a 6speed manual after conversion.

My work in progress...

 

No way in hell will you gain 40HP out of the 4.2 40V with a simple "tune". Not one reputable tuner offers that kind of a gain. The 4.2 40V is a highly reliable motor and as far as I know the only issues it has would be the valve cover gaskets and tensioner gaskets leaking. However, this is also an issue on all motors across the C5 A6 line. The weak point to the 4.2 40V is the ZF 5HP24FLA which can not handle the input torque of the 4.2 40V, and will eventually require rebuilding. Check out the various threads on Audiworld to find out more info. One final note, the 4.2 40V burns a lot of fuel!

The 2.7T motor is the best choice if you want to opt for a 6-speed manual or are looking to modify and upgrade the car in the future. I have seen documented builds that have results that surpass the RS6 with less than $2,500 of investment. On this engine the turbos develop some play after a certain period of time and will eventually need replacement if you don't allow them to cool off. As with most turbocharged vehicles, you need to drive gently at first until the engine reaches operating temperature, and drive gently before you decide to park the car. Replacing turbos on this motor isn't extremely difficult but it is time consuming, far more than a timing belt/watepump job.

Not much of a Harley guy as I've only ridden crotch rockets. A modern 2000+ Japanese sportbike can out-wheelie, out-handle and out-accelerate practically any Harley out there, and that's bone stock off the showroom floor. The only Harley that I would own would be the VRSCE V-Rod. I've slayed every car I've come across and the only times I've been beat was by other riders with more experience than me. Not to knock on Harleys though, I'd take one for a cross-country tour but I wouldn't go racing with one.

 

Halo, your car ROCKS!!!

 

Thanks dude!

BTW, you are correct, you wont get 40hp from a 4.2 tune without any other mods. But, if you are willing to drop some big money on S8 parts and exhaust, then there is power to be had. I'm shooting for 400+ hp with the following upgrades:

S8 intake
S8 complete heads with port and polish
Miltek 2.5" downpipes/high flow cats/Magnaflow 2.5 exhaust
JHM tune

Im about half way through the project. If you are interested in following along, you can check out my build thread on Audizine.

http://www.audizine.com/forum/showth...72#post7262072

 

amazing, +1 for the rims!

 

One of the best 4.2 40V cars I've seen.

 

I bought my lowering springs from this guy and he was nice enough to take me for a ride in his car, this thing looks even better in person it has a perfect stance in my opinion. By the way Michael i still have to come by and ear your new exhaust set up.

Sorry guys i was refering to halo777"s car.