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Earlier this year, I bought a super low mile dieselgate A3 TDI that I'd begun modding with KermaTDI tunes and some other bits. I really liked the car but wasn't satisfied with the traction of FWD without a LSD... even though I bought it as a responsible daily commuter for the great MPGs. Unfortunately, it was totaled only a few months of use during the beginning of the Corona. I liked a lot of things about the A3 sportback, so I opted to pick up this 40k mi Quattro to replace it and immediately proceeded to start planning the mods. I picked up the GTX2867R Gen 2 BOSS 500 from Brian at Metric Autosport in Huntington Beach, CA. Nice guy. Looking through the provided parts with the kit besides the turbo, I'm not impressed. My kit is missing at least one critical connector for the oil pressure feed and there are a ton of bits that appear totally useless for my application. Some of the fasteners are of questionable quality. There are NO instructions available anywhere, and CTS does not acknowledge emails and has NEVER answered the phone line on the website. I'm confident that I've found good solutions for the issues encountered, but it has been pretty frustrating to have paid so much for a kit that I've replaced most of the hardware for... I've had to go to various sellers online to source additional items to run the oil lines in the right clearances of the Quattro. But.... It'll work out and it's gonna be sweet!! The big appeal of a BOSS turbo is the relative ease of installation with the DV in the stock location, and the fact that this setup SHOULD work just fine with the stock fuel system, valvetrain, and internals. If anything, the low pressure fuel pump may need to be replaced, and a set of Ferrea valve springs might be in the picture if necessary... There is limited tuning support for this ECU platform. I've seen 'STAGE 3' tunes available from only a few well known groups, including APR and Unitronic. APR's tune according to them has only been used with their GTX kit using a 3Bar MAP/APR MAF. Unitronic has expressed that they are willing and able to produce a tune to suit stock fuel system ~ 400HP. Stratified has supported the BOSS for VW MK6, but the Cobb accessport does not yet support the MK2 A3 platform unfortunately. For more control and flexibility, I went with Eurodyne Maestro 7. I'm excited to get my feet wet with building custom maps in Maestro, likely modifying the K04 base file for lack of a better option before accomplishing the turbo upgrade... and then tuning from there. I've picked up the Innovate PSB-1 PowerSafe Boost & wideband 02 gauge with boost cut safety features, which will be invaluable in my efforts to produce a safe tune. I've also discussed tuning with Frank Mabo of Mabotech as a potential way to go if I'm not able to get it where I want it on my own. Mabotech produces tunes using Maestro and has a good reputation in the community it seems - he's very responsive, which is confidence inspiring. I understand that some additional fueling upgrades and rods/pistons may be good idea if I try and wring out all that this unit can deliver, but initially I'll tune with conservatism and torque limiting kept in mind. I believe that the stock internals and fuel ought to be sufficient to break 400hp, equating to a low 12 second quarter mile or better. I think that this BOSS unit is going to turn out to have been a great choice compared to comparably priced high-end K04 Hybrids, providing some more tuning headroom as the car evolves. I really enjoy this A3 Quattro for what it is and look forward to dialing it in - we'll see how well it rips after the turbo upgrade! With the tires, coils, and alignment choices, the thing corners really well - could use some stiffer sway bars though - front and rear. I'll see then if the spring rate of the Koni coils is enough, or if they ought to be stiffer. I'm looking forward to running through the Blue Ridge Parkway and other great TN roads. Maybe with brakes and sway bars this would be something I'd autocross and take to a track day.
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