EFR6258 overboosting
#1
EFR6258 overboosting
I have a built 97 Miata running an efr 6258. Currently I have a turbosmart dual port actuator on a 4port Mac valve for electronic boost control. I had the boost control down well on my mkturbo kit, but now with the efr I keep overboosting. Even with the electronic boost control turned off and a 7psi spring in the actuator, I am still getting around 14psi on WOT pulls. Anyone know what could cause this? The wastegate is opening when I hook an air compressor to the wastegate actuator, but not sure if it's opening enough.
#2
Check the alignment of the wastegate canister. With the nuts loose on the wastegate arm it shouldn't be side loaded and should be a straight shot to the hole in the wastegate arm. I had to put washers behind my canister where it mounts to the bracket on the turbo to correct the angle. Before I figured it out it would bind and boost creep.
-Mike.
-Mike.
#4
I checked the alignment and it seems good. Do the wastegate springs crack open at their rated psi? Or are they supposed to be fully open? Inhave a 7psi spring and when hooked up to the air compressor it starts opening at 7 but doesn't fully open until 12-14psi. Is that normal?
#6
I've recently worked through the same issue. I started with a medium pressure canister and couldn't get it below 14psi on my car. I switched to a low boost canister and couldn't get below 13-14psi. On my car I have to run as little preload as possible after ensuring that the linkage would literally fall off the wastegate rod without the securing nut.
#7
I've recently worked through the same issue. I started with a medium pressure canister and couldn't get it below 14psi on my car. I switched to a low boost canister and couldn't get below 13-14psi. On my car I have to run as little preload as possible after ensuring that the linkage would literally fall off the wastegate rod without the securing nut.
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