MembersPage/MarcellGal/PowerAndTraction/BoostControl (2007-05-25 09:03:01)

Subpage of MembersPage/MarcellGal/PowerAndTraction

Since the precooler and postcooler tubing is done, it's time to connect the boostcontrol parts to get the car ready for tuning upto 210kPa (and than upto 280 kPa with the bigger injectors)

BoostControl is very important on this engine for several reasons


Wastegate

The factory wastegate is used. It is suitable for much bigger airflow than the limit of the current K26/27 (appr 400 Hp)

A possible connection (under investigation):

This would allow controlling boost in a reasonable range:

The wastegate has 2 springs (these springs were out during the NA breakin). We'll see if the springs are sufficiently sized for the application.

While the above would be optimal in a dragrace car that only sees WOT and no throttle, starting with a traditional setup would be safer:

In this traditional setup boost pressure opens the wastegate, relatively easy to setup the controller to do the right thing. When it works, it might make sense to investigate the more aggressive pneumatic connection.


Boostcontrol solenoid - pneumatic valve

The factory 3-way solenoid is available (greasy, but likely works). We also have boostcontrol solenoid from [webshop Pneumatic valve 3way]

Either should work.


Blow-off valve

A factory [BOV] (also called as "Bosch bypass valve" is installed to protect the tubes, cooler and compressor from pressure spikes when the throttle is suddenly released. Some claims that this valve cannot handle 1.8 bar boost. It's very hard for me to believe this - at least if the MAP hose is connected to the top of the BOV. Anyway, we'll see.