The WRC has a sequential BOV which makes the sound when its switching gears or either is Wastegate! Does anyone know what this is? It makes like the Chichichichichichi Sound lol! I have heard that it is the Wastegate from some people and that it might be the BOV. What is it?

 

A) this is an exhaust/intake question not an engine management Q.

B) that's part BOV, part anti-lag system. search it up, you'll find the info.

 

It is the Wastegate... You must have the anti-lag system in order to have that special sound. The anti-lag system gives you maximum boost as if you were at 6,000 rpms,but you are really at lets say 1,500. Every single time you let go of the throttle the anti-lag system makes a bang. Right before that piont there comes a fuel ignition piont within the exhaust(or turbo Not sure), The fumes from the fuel ignition piont help spool up the turbo, which keeps the turbo from lagging. As soon as the throttle opens then engine develops intake, at this piont the engine is developing boost by it self so the wastegate lets out all the fumes from the anti-lag system, which makes that special sound. Now the BOV works the opposite way when you close the throttle the boost has no where to go so the BOV comes in place and lets all of the excess air out. So, there is one wastegate in the back of the turbo near the exhaust letting the excess boost out that the anti-lag system made for th Turbo to not lag.T hen when the turbocharger develops boost by it self the wastegate lets out all of the fumes from the anti-lag system. Now the turbo doesn't lag because the turbine is spinning and when you open the throttle it already has developed boost. The wastegate lets out the dirty air from the anti-lag system because it works by the setup of fuel ignition. Those fumes get out and then Natural clean air goes into the intake manifold while having high boost and no turbo lag.

 

Now engine Management come in!! does anyone know what the setup is. What ECU, Wastgate(external), and ALS(anti-lag system)??