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Friday, January 23, 2009

Now Sponsoring AudiFreaks

I'm now offering powdercoating through out my gallery etc. And sign up for the forum while you're at it, you'll notice I'm on there all the time answering people's TT questions and what not :)

email for quotes etc.

Monday, January 19, 2009

TT Engine Info

There are four different 1.8T motors that were used in the TT, by engine code they are:
In the 180 - ATC, AWP
In the 225 - AMU, BEA

Here's some facts pertaining to high performance applications of these engines:

All 1.8T TTs have a forged crank and pistons.

Yes, all TTs, right down to the FWD have forged internals (minus the rods). The stock crank has yet to break from a high HP applicatoin, same with the pistons; they are made by Mahle and have withstood over 700 bhp. The part prone to failure is the rods, which is discussed below.

Rods in 1.8T TTs vary in size, but some 180 and 225 models have the same rods.

The ATC engine, used in model year 2000 TTs, uses 20mm wrist pin rods, which makes its internals identical (strength wise) to those used in both 225 motors. However, in 2001, Audi started using the AWP motor which does in fact have weaker 19mm rods. The rods shouldn't be trusted for applications above roughly 300 ft-lbs of torque.

The 225 has a "webbed" block...but nobody has broken a 180 block yet anyway.

Audi included some "webbing" around the 225 block to increase its strength. However, at least in the short term, someone has yet to cause the 180 block to fail.

Some TTs have wideband oxygen sensors, some have narrow band.

Early TTs did not use a wideband oxygen sensor and later models did. Not all 225s have wideband; the AMU 225 motor, used until somewhere in 2003, still uses narrowband. The AWP 180 motor, used in TTs since 2001, incorporates wideband. In a nutshell, ATC 180s and AMU 225s don't have wideband, AWP 180s and BEA 225s do have wideband.

Wideband is a highly desirable option for tuning, since it allows the engine to precisely control air fuel ratios to the point where the engine can run without a MAF sensor, given the proper ECU software.

The 180 and 225 have different compression ratios.

The 180hp TT has 9.5:1 compression whereas the 225hp TT has 9.0:1.

225s have bigger injectors

225s have 380cc injectors whereas 180s have 318cc. For almost any big turbo setup, however, injectors will have to be swapped out.

Some TTs have variable valve timing, but it's not for performance.

VVT is used on startup for emissions and makes for ridiculously expensive cam chain tensioners.

There are other differences between the 180 and 225, primarily related to the turbo hardware.

Sunday, January 11, 2009

TT Transmissions

There seems to be some misinformation floating around about what transmissions are used in which model of the TT, so I'll take a moment to set it straight.

180 FWD:
The 180FWD uses the 02J transmission. The 02J is an older and weaker design than the 02M. The 02J from the Audi TT FWD and other drivetrain components (axles, clutch, flywheel) can be swapped directly into a 1.8T MkIV Volkswagen and vice versa. I sold my old 02J to a local guy with a GTI who is now running it.

180 Quattro:
All Quattro cars use the newer 02M transmission. The 02M is a newer design and is generally bulletproof. For a high HP drag car, an 02M is rather desirable as the 02J has a habit of breaking from abuse.

225 Quattro:
The 225 uses the same type of transmission as the 180 Quattro, just with slightly different ratios and a sixth gear added. IT IS NOT a better/stronger transmission than the 180 Quattro's.

It is possible to swap a 6-speed 02M from a Jetta GLI or 337/20th AE GTI into a FWD TT in place of the 02J, however it's not cheap or simple. Apart from the transmission itself, which costs $1000-$1500 used, one must obtain axles, a clutch and miscellaneous pieces which total up to around an extra $1000 (going with used parts, mind you) on top of the cost of the transmission itself.

Here's a chart denoting the ratios for each:

Tuesday, January 6, 2009

Angel Eyes - DIY

Angel eyes are without a doubt one of my favorite mods I've done. It's not hard to see why:

They look fantastic on the TT. Almost looks like the car should have come with them.

However if you look around, the only TT specific kit is the HIN Concepts kit...which costs $150. Fortunately, an excellent solution can be had for cheaper....about $35.

I bought a set of these on eBay from that very seller, who was very helpful and shipped them out really quickly. The high beam poriton of the headlight housing is about 100mm you want the 90mm set that I linked to. This is what the second set I got looked like:

The trickiest part is finding something to mount the lights with. I found a useful piece for this in the most unusual of places...

Go to your closet. Find a hangar that's used to hang pants...the kind that is straight with two clips at the end that are held together with U shaped metal clips. You want these metal clips:

Once you have your headlight apart, use these metal clips to secure the angel eye to the top part of the housing. You may have to bend the clips a little to make them fit tighter, and I'd highly suggest reinforcing the angel eyes with some high strength tape. This is what happens if you don't reinforce them tightly enough and proceed to track your car and later drive with high beams...(the ring vibrated off the mount and onto the high beam bulb):

Wiring is up to you, you could wire them to replace your running lights, or you can wire them to any separate 12V power source. I wired them to an ignition switched lead under my dash and then ran a switch in the cockpit to turn them on and off. I also removed my stock running lights for a cleaner look. I drilled a hole to run the wiring out the back of the headlights:

Since I didn't make this exceptionally clear, feel free to shoot me any questions in an email or Vortex PM. Good luck!

Friday, January 2, 2009

Cracked Bumper?

Being winter, I know there's a lot of TT owners out there busting their front bumpers on chunks of ice/snow in the road or from running off road to make up for people's dumb mistakes in the snow. Fortunately there are options and upgrades to those with messed up bumpers.

If you cracked just the lower portion, you can cover it up with a Votex front lip. Votex is OEM styling from Audi...which means OEM look, OEM fitment and OEM quality. They make rather clean side skirts and a rear valence can find them on If I recall, the front lip is ~$400. It can also be ordered from the dealership.

Pics of the lip:

No other lip gets the job done better/cheaper that I know of.

Other options include the OEM bumper ($400 from the dealer) the S-Line bumper (somewhere around $1200 from the dealer) or you can splurge on an aftermarket option.

For those of you who want to shave your alien doors, there's a version of the bumper without doors for headlight washers, the part number is 8N0 807 101 AA.


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