Engine Differences between the 180 and 225 TT

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Feb 13, 2003 | 04:34 AM

odonnks

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Engine Differences between the 180 and 225 TT

Aside from the exhaust and compression ratio, What are the mechanical differences from the 180hp and the 225hp engine?

Take care

Feb 13, 2003 | 05:12 AM

4SFEDTT

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Turbo, intake manifold, dual intercoolers.....i'm sure others can get more specific

Feb 13, 2003 | 05:21 AM

LighTTnin

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Odonnnks - do a search for it... I remember days and days of back and forth posts about it.

Feb 13, 2003 | 05:31 AM

SprinTTer

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Quite a few things. Here's a pic showing a FEM analysis on the block.

<center><img src="http://pictureposter.audiworld.com/8717/225_engine_1.jpg"></center><p>FEM = Finite elements analysis.

Apparently the block is strengthened, pistons are forged and made by a different alloy, 1st ring on piston groove became 0.5mm thicker, pistons got reinforced shafts, crank housing ventilation was optimized, bearings are beefed up, turbocharger and exhaust manifold are different, downpipe and exhaust are different, injectors are larger, etc etc.

Feb 13, 2003 | 05:33 AM

SprinTTer

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Here's a diagram of the piston reinforcements

Feb 13, 2003 | 05:39 AM

SprinTTer

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You can download Audi's report on the 225 engine here:

Unfortunately, it's in German but I used a translator and quite a few things came up. It explains the differences between the 210bhp (early S3 models)/225 bhp (Audi TT/late S3 models) and the 150 bhp/180bhp lumps.<ul><li><a href="http://www.audi-speed.com/community/download/download_show.asp?M_ID=0&S_ID=44&KAT_ID=2& amp;ID=24&Referer=/community/download/default.asp?M%5FID%3D0%26S%5FID%3D44%26KAT%5FID%3D 2">Link to pdf file</a></li></ul>

Feb 13, 2003 | 05:48 AM

EighTT

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I used to claim these differences, but a number of folks said I was wrong. Here's a discussion...

<center><img src="http://www.sae.org/automag/newenginereview/images/audi1.jpg"></center><p>
<ul><li><a href="https://forums.audiworld.com/tt/msgs/95495.phtml">Engine Differences</a></li></ul>