SixSpeeder
Go Kart Champion
- Location
- Forum, Doe.com
Arin from APR just posted some of the differences in the motor of the MK7 R on vwvortex.com:
http://forums.vwvortex.com/showthread.php?7007282-APR-Presents-the-MK7-GTI-ECU-Upgrade!/page9
- Cylinder head (made from a different alloy compared to other engines in this module because of higher thermal stress)
- Exhaust valves (hollow, higher Ni content, nitrided)
- Exhaust valve seat rings (improved temperature stability and wear resistance)
- Exhaust camshaft (adapted valve timings)
- Compression ratio 9.3:1 with different pistons
- Piston cooling jets (higher flow rate)
- High pressure injectors (even higher flow rate)
- Exhaust turbocharger
- Charge pressures of up to 17.4 PSI (1.2 bar)
- High performance main radiator with 1-2 auxiliary radiators (depending on country specifications)
- Additional acoustic modifications have been made in order to achieve a sporty sound - use of a sound actuator (for the occupant cell) and active exhaust flaps in the exhaust system
Arin - That's great information.
I have a question for you, that I haven't seen answered yet (unless I missed it in another thread): Can you compare for us the IHI turbo series to the Borg Warner K03 and K04 turbos to give us an idea of how to compare the two series.
1. Is the IHI turbo in the Mk7 GTI is equal/smaller/larger than BW K03 or K04
2. Same question regarding the turbo in the S3/Golf R
3. What IHI / BW / GTX turbo may be considered in a stage3 kit
1. It's quite different. I'll have to measure the wheels but visually the compressor wheel is smaller than the K04. The turbine wheel has far fewer blades too.
2. The GTI and R are similar - Wheel sizes vary.
3. Borg Warner EFR or Garret GTX. We're trying both paths.
http://forums.vwvortex.com/showthread.php?7007282-APR-Presents-the-MK7-GTI-ECU-Upgrade!/page9