225TTQ and 180TTQ

[poo_00tt]

I was curious as to how interchangeable are the parts between these two models. (i.e Turbo Kits, Engine Parts, Suspension, Driveline) To me they sound as if its no problem to swap parts. I know the engine codes, horsepower and transmission are different. I know that you can use the K04 from the 225 in the 180 as long as you change the DP. If someone could shed some light on this buying parts will be so much easier for me. Thanks.

[InTTruder]

The 225 has 2 smic, different ecu, and other significant differences. Driveline is i/c.

Swapping in the K04 requires more than a DP.

[poo_00tt]

...other significant differences.

I know the K04 takes more than a DP, I've looked at doing it; I was trying to reference things that I knew were I/C and failed horribly. I'd rather go with a GT2860RS, but that's besides the question. These other differences, would be like?

[InTTruder]

I know that you can use the K04 from the 225 in the 180 as long as you change the DP.

OK, mistook your example.

The 6spd is i/c. everything "in front" of it (from flywheel back to intake) is not. Even the airbox piping routes differently because of the two SMIC. AFAIK, the brakes up through the output flange on the Haldex are the same. Here's our best list of differences:

- 2 IC's vs 1 IC
- MAF larger in 225 with the resultant hoses.
- Intake manifold larger in 225, plus opposite side of engine.
- All of the intercooler plumbing.
- K03 vs K04
- Vented 10.1(225) vs 9.4(180TTQ) vs 9.1(180) solid rear brakes
- Single tipped exhaust in 180TTQ and dual tipped in 225, same muffler in the quattros, but different exhaust for the 180 Fwd.
- Larger cats, larger downpipe, larger exhaust all in the 225
- different exhaust manifold
- extra gear in the tranny for the 225 (6 spd)
- Plastic engine cover is completely different.
- pistons are different to give lower compression in the 225 vs 180.

It has been "reported" that the internals of the engines are different . . . nobody has ever proven this. Gone through the ETKA part by part parts are the same.

The heads are different to allow for the different comprssion as well as the larger intake. Different throttle bodies, 225 is larger.

Can't compare the Fwd to the quattro. The cars have different trannies, rear suspensions, exhausts, exhaust manifolds, downpipes, 1 vs 2 cats.

Used to be different wheels, but that changed with the 2002 models, now the 225 is coming with the spokes standard more often than in 2001.

[poo_00tt]

Thanks. I came about this question looking at parts. I notice that some of the 180 parts look exactly like the 225 parts, and I was curious if the were I/C. Also, so your saying that the 225 head may have better flow characteristics than the 180, but on that note doesn't the 225 have VVT? So swaping a head would mean swaping an ECU.

[InTTruder]

I opine (I'm no developer) that swapping a head would only get complicated if you also swapped the ECU. The "system" is dynamically tuned, and the ECU thinks it is attached to a specific system. Mix-n-match might get you way off the maps, with resultant damage or degrade.

[joe@vwvortex]

Thanks. I came about this question looking at parts. I notice that some of the 180 parts look exactly like the 225 parts, and I was curious if the were I/C. Also, so your saying that the 225 head may have better flow characteristics than the 180, but on that note doesn't the 225 have VVT? So swaping a head would mean swaping an ECU.

225 head is the same as the 180 head. BEA engine code from 03 on was VVT same as AWP 180hp engine. AMU is non VVT. AEB is the only large port head and it was on the 150hp A4 engine from 1997 to 1999 or 2000.

If you want more power - go GT turbo - forget converting to a 225 system - it simply isn't worth the money unless someone gives you the parts.

[InTTruder]

If you want more power - go GT turbo - forget converting to a 225 system - it simply isn't worth the money unless someone gives you the parts.

Good advice from one of the masters in the TT business.