Stage 1 is designed to squeeze every drop of fuel from original (stock) fuel hardware, for excellent power potential. Most people report MPG improvements. Do not use with upgraded fuel hardware.
Upgraded injectors, and clutch (if manual transmission)
"VNT-17" turbo detail chart:
* Genuine (OE) Garrett or Borg-Warner turbos are strongly recommended. The vast majority of rebuilt or hybrid turbos are not optimally calibrated. VNT type turbos are naturally more complex than wastegated turbos commonly found in gas (petrol) cars, therefore there is more room for error. We do not recommend other brand turbos. However, if you put in a potentially significant amount of work logging boost and recalibrating the vacuum actuator and/or stop screw, then you might get reasonable results from an aftermarket/rebuilt turbo.
** VNT-17/22 was a popular turbo which our Stage 5 tune was built upon on. Stage 4 also runs well with that turbo. That turbo was originally created by an official Garrett distributor, with very consistent results. However, the performance upgrade over a regular VNT-17 is marginal. They also stopped producing the turbo years ago due to parts availability issues. "17/26" or "GT1752v" aftermarket options may exist today - they are similar in size to the classic VNT-17/22, but we see more inconsistent boost control with them due to their actuator & stop screw setup being of lower than OE quality. We recommend a brand new & genuine Garrett / Borg-warner "VNT-17" instead paired with Stage 4 to give your vehicle a rock-solid OEM+ boost.
For cars with automatic transmissions (01M, 09A Jatco JF506e, etc.): Stage 4 can still be used. We do not have tunes for automatic transmission computers (unless it's a DSG in 2004-2006 New Beetle TDI). The automatic transmissions are known to have less-than-stellar reliability, even with stock 100hp power. Although we have many such customers running a full Stage 4 ECU tune without issues, we can offer a reduced-torque Stage 4 tune if you want reduced risk - please ask us.
This is a low-torque version of Stage 4 designed to reduce chance of clutch slip in manual transmission. The peak torque typically occurs at lower RPM, and that is where it's limited. This tune attempts near Stage 4 power at higher RPM.
Automatic transmission owners may also consider this to reduce transmission stress. We do not offer tunes for automatic transmission computers.
Upgraded injectors, clutch (if manual transmission), VNT-17/22 turbo, and 3 bar MAP
Larger than VNT-17/22 turbo, or a wastegated turbo.