ok, if you all are spiking you need to ceck your start boost setting, which will be "set gain", this is in PSI NOT percent like gain and set boost. the start boost setting is when the EBC will start to open the wastegate. that means, it activates the solenoid so the WGA sees the boost signal. without a boost signal it'll stay closed. normally the WG will start to crack open at only a couple PSI and open more as boost increases. this is bad for response, but helps keep spiking to a miimum . so, setting the start boost setting closer to your target PSI will increase response by delaying the opening of the WG, but you may spike dependig on where you set it.
i advise everyone with the stock gt25 to set their start boost all the way down and either leave it there or slowly increase it until you can balance response and spikes. small ass turbos spools very quick, so you really don't need to help response by increasing the set gain. me on the other hand, i hve my target boost at about 13 psi, so i am able to set my start boost at 10psi and get a very quick 1-2psi spike.
