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VW/Audi 07K (2.5L 20V I5) Swap Thread

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Old 03-04-2014, 07:04 PM
  #16  
Voith
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Originally Posted by OmniGLH View Post
Much more interesting than an LS swap
+1 These engine can be very brutal.
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Old 03-04-2014, 07:10 PM
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Dougs951S
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What is the development like in terms of increased displacement? Any stroker cranks available? The fact that its an iron bore instantly caught my eye. It's a much smaller bore than our motors, which helps to raise the knock limit. How much room is left in the sidewalls to expand? Any convenient off the shelf pistons available with a bore larger than stock?
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Old 03-04-2014, 07:46 PM
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This will be a cool swap
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Old 03-04-2014, 07:46 PM
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fantastic and ambitious project.
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Old 03-04-2014, 07:47 PM
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Old 03-04-2014, 08:15 PM
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Cool!
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Old 03-04-2014, 08:19 PM
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Originally Posted by Dougs951S View Post
What is the development like in terms of increased displacement? Any stroker cranks available? The fact that its an iron bore instantly caught my eye. It's a much smaller bore than our motors, which helps to raise the knock limit. How much room is left in the sidewalls to expand? Any convenient off the shelf pistons available with a bore larger than stock?
Sadly there isn't really any room to bore it, 0.5mm would be about the limit to boring. There aren't any stroker cranks available and I think the stock 92.8mm stroke is about the max for this block height (same as the rare 92.8mm crank for the old Audi I5's). The older I5's could go bigger if you used a tall-deck TDI block. There isn't such an option for this that I know of.
You could do the math to try and offset grind like the hybrid stroker, but you're piston speeds might get to fast at these kind of RPM's.
Rods are $525/set for H-beam and $790/set for I-beam.
Pistons are $840/set for JE custom spec.

I also don't think you need it. Reposting the low-boost 07K dyno plot vs one of a 2.9L 24v VR6 with a similar turbo at the same boost and they are basically identical. The 07K makes the same horsepower/torque/spool at the same amount of boost with 0.4L less and is a good 100lbs lighter than the VR6 (and cheaper).

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Old 03-04-2014, 08:21 PM
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mikey_audiogeek
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Originally Posted by alxdgr8 View Post
[B]-Bellhousing adapter. This can be done several ways, but I'll most likely be modifying a VW bellhousing to fit the torque tube instead of modding the Porsche one and adding an adapter plate.
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Transmission is an 0A4.

Cheers,
Mike
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Old 03-04-2014, 08:30 PM
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Yep, I was planning on getting one and doing something like this: http://forums.pelicanparts.com/porsc...nightmare.html

It's the same pattern basically as 1.8T, so pretty much any FWD box can be hacked up. Some might need trimming at the top to clear the bulge. In the AWD application they shaved the top two mounting bolts off of an 01E to fit (Audi did the same thing on their race cars during the Group B days to speed up clutch changes).

The other 1.8T 944 running around (Lemon's Car) went the other route and made an adapter plate for the 951 bellhousing. With the 07K you'd have to do a lot of trimming to get it to fit even with an adapter plate since the 951 bellhousing is so tall.
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Old 03-04-2014, 08:47 PM
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Keep it transverse and convert to 4wd!

Seriously, I think even with the 2.5L capacity there is a lot of potential available for this motor. For a track car it would be fine with such high rpms and some custom rods/pistons you could see some pretty decent power. The next thing to deal with would be the driveline. Damn I wish there was an easy sequential option for these cars that didn't cost the Earth.
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Old 03-04-2014, 09:04 PM
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Looks like the cheapest way to get direct injection! Looking forward to it!
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Old 03-04-2014, 11:54 PM
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Originally Posted by Voith View Post
These engine can be very brutal.

you're wayyy out of hand on that post.

the exhaust note of any pushrod V8 engine can be made to sound very good with a straight-through exhaust running

1. headers

2. y pipe.

3. good resonator.

4. good muffler out the back.
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Old 03-05-2014, 12:33 AM
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Originally Posted by lee101315 View Post
Looks like the cheapest way to get direct injection! Looking forward to it!
No direct injection for me. It is on the TT-RS engine, but the head is a complete different casting to accommodate that. TT-RS head = $$$$
If you want DI, it would be better to go with the 2.0 FSI I4.
And I don't think DI is quite there yet for high HP builds.
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Old 03-05-2014, 01:09 AM
  #29  
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These engines are crazy plentiful. I have one sitting on my shop flor. This swap will be a great build. I just picked up an A4 Avant with a 1.8t. Doing the measurements, the I5 is about 1" longer than the 1.8.

I imagine the audi guys will be swapping these in in no time at all.

Please post specs of the bellhousing when you get there. I might be doing one of these down the road myself.
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Old 03-05-2014, 11:32 AM
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Very cool. Will be watching this...might put me off V8s entirely if the torque comes on early enough.
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