Previously, i was running drag manifold with deltagate wg. I had problems of overboosting .5 bar (accorinding to my gauge). Its overboost at high rpms (over 6k rpms) than it starts spiking or bogging. I thought it was the wastegate, so i upgraded to a 38mm tial wastegate with a .5 spring. After the upgrade, I still overboost .5bar and slight bog or spike at higher rpms. Do i have to change my manifold too?

 

the drag manifold has poor wastegate placement so that is probably your problem. is it possible that your boost gauge is reading wrong?

 

^^^ like dood said its WG placement on the drag mani, it BLOWS

 

https://honda-tech.com/zerothread?id=802961

Here is a link to a thread started by Nick the FI moderator about this problem. Drag manifolds are known for boost creep because of the wg placement as stated before, but in that thread there are some solutions to the problem.

 

i run the same set up.Drag manifold with a 38mm wg. and its .5 bar.I dont have any problems.May be your gauge is bad?And how much are you over boosting?

 

Im overboosting about to .7bar at high rpms.