16. Turbo – So now you have your FMIC, clutch, exhaust and your ready for the new turbo and software to go with it. NICE!
Turbo Options
This is meant to be a short guide to turbo upgrades. There is a ton of info around here and other forums. Please make sure you use the search for additional info on the type of upgrade you're looking at prior to making a hasty decision.
Some highly recommended parts to get before upgrading your turbo are pretty much all the things that you have just read in this. so get those first as there are certain steps and and order to things.
K04
The ko4 that you want is the ko4-15. Basic bolt in upgrade. No special required parts unless going for the pc-16, J31, or Hammer files from GIAC. Do not pay more than $800 for a K04 alone. They can be found on any of the various Audi forums for less. GIAC makes a very good program for it. $1300 and an install later you can be rolling with 200whp. When looking you will need the K04-15. do not bother on doing a ko4 for your 2001 A4 if you are not going with the Hammer file. the 2001 model year has the ko3s(sport) so there for the GIAC-X chip with the ko3s will only be slightly less powered than the ko4 on basic GIAC programming. for knowing what you need for these setups contact GIAC directly. as it will be easier than me typing it all out. KineticMotorsport has them for a good price usually
PC-16 - 1997-1999.5 model years~usually runs in the 20-25psi range
j31 - 2000~usually runs in the 25-28psi range
Hammer - 2001 and 2001.5~i think usually runs in the 20psi range
GT2X Eliminator
Bolt in upgrade. Slightly larger than the K04. Good for 220Awhp. Most people use the Mika tuning from ATP, others use modified K04 software. it is only oil cooled unlike the other eliminators
GTRS Eliminator
Bolt in upgrade. Much larger than the stock K03. Produces roughly 350chp. Mika tuning or Unitronic for the B5.
GT2871R Eliminator
Bolt in upgrade. $95 more than the GT28RS elim. good for 400chp. Mika or Unitronic for the B5.
Note: For the eliminators, I highly recommend a braided oil return line. The stock oil return will work, but it's a pain to get in. Unitronics for software, but also Mika tuning offered by ATP can be a good software. but FWIW not off the shelf. it requires tweaks to get things running right. some have run tweaked ko4 software with success on this big of a turbo. ATP and Renn-Art are the best places to get the eliminator products. Renn-Art has a proven kit.
APR Stage 3/Stage 3+ kits
APR has a stage three kit with everything you need to get your BT up and running. they have their stg3 GT28r kit for 1997-2000. and their stg3+ GT28RS kit for 2001s. both are very respectable and worry free kits that a lot of people love. APR's website for more info
Full GT28RS
Requires ATP or custom exhaust manifold, custom downpipe, and custom intake. Approx 400chp, depending on the tunng and supporting parts. Needs custom tune, standalone, or dyno tune.
Full GT2871R
Requires ATP or custom exhaust manifold, custom downpipe, and custom intake. Approx 400-450chp, depending on the tunng and supporting parts. Needs custom tune, standalone, or dyno tune.
T3/T4
Requires ATP or aftermarket exhaust manifold depending on flange, custom downpipe, and custom intake. hp numbers vary as there are numerous different sizes, Trims, A/R's and such. Requires custom tune, standalone, or dyno tune. CTapp is also a good option for software.
GT2871R elim vs GT2X elim vs Stock K03
