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.
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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. |
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?
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Originally Posted by Jmatt07
(Post 1620014)
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?
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I had a crazy overboost problem using the turbosmart actuators. Mine did not have the same overall stroke length as a stock EFR cannister. Hook some air up to both the stock and TS cannisters and see if they are opening the wastegate the same amount.
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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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Originally Posted by 6speed
(Post 1620090)
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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Another consideration is the turbo will be destroyed if the nut comes off.
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