Only 0.7 bar???
#1
Only 0.7 bar???
Hi, I just noticed my 93 k-plate WRX isn't boosting as high as it was before. Its only hitting between 0.6 bar and 0.7 bar. Where as I'm sure it was up at 0.8 bar before. I guessed at it being a bad batch of fuel causing the ecu to not allow full boost, but after adding a tank of optimax and octane booster its still the same. The only things that have changed are I fitted an HKS SSQV BOV recently. Does anyone have any ideas? I was concidering reseting my ecu.
#3
Ok, hopefully its just that then. If I had been getting some knock from 97 ron fuel thought and the ecu reduced the boost. How long would it take the ecu to re-learn that the new tank of fuel is fine and thust allow full boost again?
#5
Could be the heat, or you could have connected the pipework incorrectly (done away with the boost solenoid or similar by tee-ing into the wrong pipe), and the wastegate is opening at it's pre-set pressure, can't remember for sure what that pressure is on your motor, but probably around 0.5-6 bar.
#6
I'm pretty sure that the pipe work is all correct from the BOV installation. The SSQV came with a connector to join its vacume pipe to the original one (I take it thats the boost solonid connection) and the recirc inlet on the induction pipe is sealed up properly. If there was a leak from the small vacume pipe would that effect the boost then? I may run a new piece of pipe to make sure its not that before i try an ecu reset.
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#10
Thats the thing it seems to be slower since I fitted the HKS SSQV. If the pipes are fitted correctly surely the VTA type cant effect anything. I'm sure it used to boost at 0.8bar.
#11
Originally Posted by speedracer
Thats the thing it seems to be slower since I fitted the HKS SSQV. If the pipes are fitted correctly surely the VTA type cant effect anything. I'm sure it used to boost at 0.8bar.
Since the ambient temp is a bit high at the moment - 31 - 33 degree C as the radio says, you will likely see lower boost.
Don't worry, unless it stays that way when the weather gets colder!!
#13
Due to inlet air temps, the ECU wants to keep the engine safe so cuts back on ignition timing and boost to stop it blowing up ... that's why people go to better / bigger top mount intercoolers, front mount intercoolrs, water sprays, water injection etc. - to keep inlet charge temp down.
So maybe ECU is letting some boost pressure go to keep engine safe.
In my case, my 18 psi became 16 psi tonight as it was so hot ... same gear, same right foot! That's on an apexi PFC with boost controller ... felt slower and boost gauge confirmed it. Maybe my explanation was wrong but same efect here in hot weather !!
So maybe ECU is letting some boost pressure go to keep engine safe.
In my case, my 18 psi became 16 psi tonight as it was so hot ... same gear, same right foot! That's on an apexi PFC with boost controller ... felt slower and boost gauge confirmed it. Maybe my explanation was wrong but same efect here in hot weather !!
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