How much power are you able to extract from each?
I've heard 600-900hp easy from a Sports engine.
Is it possible to get 600-900hp from a UrQuattro engine, or a 20V 2.2 from lets say a 90' Coupe Quattro? Or are they just to different?

Dream the dream my friend..heh

I just want the most power possible. Im a nut.

give me some setups. Im guessing a 20V 2.2 with very large turbo?

...After that, it gets VERY expensive VERY quickly. Things like intercoolers have to changed. Pistons, con-rods, and connecting pins have to be strengthened, for the increased HP. The cams have to be changed out, The head needs to be ported, and polished. The turbo size needs to be increased. There was a kit that someone just found on e-bay in Germany. They can take your 20vt motor, and bring it uo to 350hp, for the paultry sum of $17,500. Dahlback Racing, in Germany, can make you an engine that is pretty close to what the IMSA 90 engine was. It'll cost ya in the neighborhood of $60,000 though. It all depends on how muck money you want to spend.

You would have trouble looking for Dahlbäck in Germany. He's from sweden.

<ul><li><a href="http://www.audituning.com/">http://www.audituning.com/</a</li></ul>

Right now the I520vt can support 400hp with RS2 bolt on goodies and stage III software. I put one of these on a chassis dyno and got 301rwhp (corrected 400+HP crank). After 400hp you need to change the rods, MAF and use a big IC. Right now the jump from 400 to higher gets into big money/HP. The advantage of the SQ engine is it has a monster IC, and it uses the SQ larger MAF already. The RS2 MAF tends to implode at about 440hp sustained.

WRT the "sport" engine, it's just an aluminum block 2.1 liter motor, there's really nothing special about it vs the urq. The 3B and the AAN are cheaper alternatives, and can give the added advantage of more CC's.

SJ
'84 RS2URQ Project
'83 urq k24 22psi electronic diff lock conversion
'87 t44tqw 22psi

How big does the intercooler need to be for the 400hp version? How about turbo?

What rpm does the boost kick in in this configuration?

My idea (plan) would be programmable fuel injection (speed density) running custom JE pistons, 7A head/cams, MC-1 block/crank/rods, RS2 intake manifold, 3B throttle body, custom weld-el exhaust manifold (or RS2 or SQ?), and some as-of-yet-undefined turbo.

Since the exhaust manifold would be custom, what turbo should I run? I assume some type of Garrett? Would ball-bearing be worth the extra funds? I would plan to keep the car/engine at least 5 years or forever, to give an idea of how I plan to amortize the cost.

Do I need to replace the MC-1 conrods with some stronger ones for 400hp? Is the crank okay for this power level?

Is the 400hp configuration very streetable at all? What compression ratio should I go for?

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One key thing is that the SportQ has a more desirable intake manifold layout with the throttle body upfront as opposed to the Urs4 and RS2. I was wrong in stating that the 20vt UrQ has such a manifold. This allows for a very short charge air path and much reduced turbo plumbing volume over the RS2 configuration. Which means less lag. If you have only 50% of the plumbing volume with the same hardware you looking at much less lag. So you can enlarge the intercooler without going overboard on the total turbo plumbing volume. If you enlarge the intercooler significantly on a rear throttle body intake manifold you have to account for all the volume in the piping taking the air across the front and back to the firewall.

In the picture, you'll see the RS2 turbo to the left which has charge air exiting downward and forward straight into the bottom of the intercooler which is on the lower left of the image up high behind the front grill. The air goes from left to right and comes out of the intercooler directly into the throttle body. Total length of plumbing pipe is about 12 inches from the turbo to the intercooler. The rest of it is all intercooler. and the total volume is extremely small.

I've been thinking a lot about intake manifolds lately, coincidentally.

I just found out the RS2 IM won't work with a physical distributor, as it interferes. I had planned on using one of those, after deciding that I would have a hard time fabricating a manifold with a front-mounted throttle body myself. (Actually the thing that caused me to pursue the RS2 with the rear-mounted TB was the availability of a used 3B throttle body and intake pipe, which can be used with the RS2 intake manifold. Before finding that, I had planned on making a custom manifold and using any available large bore throttle body.)

Anyhow, I do think it is ridiculous that the 3B and RS2 iterations have the path go from the turbo, through an intercooler to the opposite side of the motor, and pipe it back onto the turbo side of the motor, only to enter the intake manifold at the back of the head and wrap around once again to the opposite side if the motor. I've really been trying to avoid this in my eventual 20vt buildup.

One thing that is possible, but I don't know if I'm brave enough to try it, is to take an RS2 type manifold and cut it to rotate it around and reweld it so that the throttle body is at the front. Supposedly this is what MTM and/or Dahlback has done. I priced some front-mounted TB configuration intake manifolds from Dahlback, and choked when I got the response. One was like $1700 and the other was $2k, maybe more. For that month I can buy myself a TIG welder and practice until I figure it out.

There is also a guy in Europe somewhere that has a custom one he's considering selling. Even being used, that guy wants like $900 for it. The top panel has been replaced by a thicker piece, as the pressure changes had apparently fatigued the original piece until it broke.

Hey, wait a minute. You wrote that the 20vt ur-q also has the throttle body mounted at the front? We're talking about the RR engine code, right? It is my understand that it is just like the 3B basically. I wasn't aware that the 20vt in the ur-q was this configuration. Are you sure about that?

I appreciate the reply, btw. Thanks for the pic too.

No, the 20Vt (RR) ur q did not have the TB in front. It is the same manifold as the 3B.

The 3B or RR pressure pipes do not mate up with the RS2 intake (it places the TB further back towards the firewall, so you would need RS2 pressure pipes (or make you owne) and an AAN, ABY or ADU TB to match up with it with the added length. I wouldn't recommend the RS2 intake in an ur q unless you are doing the entire ADU engine or REALLY want that "Powered by Porsche" look, as there is little firewall clearance with it.

TS Tuning and Wagner Tuning in Germany have intakes that put the TB in front for &lt;$1k.

YES, you will need stronger rods if you are looking for 400+ hp. You will also want the AAN rod bearings.

You might consider using a turbo head instead of the 7A, or have the 7A modified to use the turbo's coolant manifold. Coolant flow in the head is VERY important on a big Hp turbo engine.

Generally, big Hp Audi I5s run 8.5:1 CR.

Dahlback Racing has great tubular exhaust headers. Trust me, unless you have a brother who is a race car fabricator, you won't get one for less $.

Is 400Hp streetable? The RS6 has 450. It all depends upon how good a job you do getting all to work.

Plan on spending ~$10-20k if you want to do this right.