Need Help Please!!!
#1
Need Help Please!!!
Ok so this is for my friend with a 93 civic hatch. it has an obd-2 b18LS, T-3 turbo, HKS SSQ BOV, 9lbwastegate spring, tuned on AEM EMS and e-85.(put down 256 whp)
well anyways the problem, he had a ---- *** ebay manifold which as we all know crack, so it went to ---- and we just got the new cast style manifold all hooked up earlier today.....but under full throttle and full boost it will out of nowhere slowly let out the BOV and stops building any boost at all even whille giving it full throttle....were alll just sorta lost on y this would happen, because if there was a boost leak y would the BOV go off?....any help is much appreciated.....
well anyways the problem, he had a ---- *** ebay manifold which as we all know crack, so it went to ---- and we just got the new cast style manifold all hooked up earlier today.....but under full throttle and full boost it will out of nowhere slowly let out the BOV and stops building any boost at all even whille giving it full throttle....were alll just sorta lost on y this would happen, because if there was a boost leak y would the BOV go off?....any help is much appreciated.....
#4
Re: Need Help Please!!!
Did he increase the boost when he put on the new manifold? Sounds to me like air is leaking out of the blow off valve. See if you can adjust it to hold in the boost. Might want to see if all vacuum lines are installed correctly also.
#5
Re: Need Help Please!!!
no we did not adjust the wastegate it has the 9lb spring in it.....and all the vacume lines are hooked up correctly....and i dont think u can adjust his bov....its the brand new HKS super sequential one
#9
Re: Need Help Please!!!
they way bovs work is pressure from boost holds them closed (pushes against itself with the help of the spring) and when you close the throttle, the strong vacuum on applied then pulls (against the spring) while also being pushed by the pressure hehind it and opens.
as they've said, if the line to the bov is not right, the boost could just push it open without the appropriate boost pushing it closed from the diaphragm. if this is the case, you might expect that it doesnt open decisively at throttle closed.
the bov should be open sitting idling with a strong vacuum. check this. if its not, then you probably dont have a vac signal going to it.
a leak in the vac line like phil mentioned because of the size of the tube will negate most of the pressure applied to it.
as they've said, if the line to the bov is not right, the boost could just push it open without the appropriate boost pushing it closed from the diaphragm. if this is the case, you might expect that it doesnt open decisively at throttle closed.
the bov should be open sitting idling with a strong vacuum. check this. if its not, then you probably dont have a vac signal going to it.
a leak in the vac line like phil mentioned because of the size of the tube will negate most of the pressure applied to it.
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