TARManiAC

I just finished deleting the Tumble Generated Valve System on my MY01 WRX
as described on NASIOC. All I can say is that it makes a lot of difference in spool up time. I would say at least 10 extra HP. There is more in this mod alone than in i/c hoses, porting exhaust manif., porting throttle body and porting i/c together. A must do on cars with TGVS. But itīs a lot of work to do properly.

Have fun :-)

hades

What "version" did you do? I've seen various options on NASIOC from just removing the flap right through to converting to a completely empty ported tube.

Also, did you need to do something to fool the ECU to thinking the tumbler system was still working fine?

TARManiAC

Sorry for the slow answer Hades.

I took out the valves, cut the axles in halves and removed the partition walls with a saw and a grinder. Didnīt have to fool the ecu as all the motors and sensors are still there. No problems, no cell just a lot of useable power and fun. Later I installed the AVO turbo inlet pipe so itīs time for a re-map now (knock-link has turned into a christmas tree :-) )