Hello Everyone.. I have a little problem and I think I know what might be causing but I thought I'd check the local guru knowledge base before chasing my tail.. A couple of weeks ago I had a rather large PTU problem due to me not connecting up earth points on the Plenum (killed one series 2 and my spare series one consecutively).. now the lovely CAZ pulled me out of the poo while waiting for her series 2 units to come in (she loaned me a series one to get me by - I think a bunch of flowers should be in order)... ok with Caz's PTU in place the car has been running fine with a slight BUT... it is horrendisly slow to build boost and only gets to about 13psi..ISH.. I have a HKS EBC set to 18psi but just won't get there.. now I haven't checked for boost leaks YET (will do this tomorrow) but I have found something tonight after getting home from a cruise.. my det sense has a broken wire on it.. I still have my stock safety boost solenoids hooked up (yes even though I have an EBC and it has never been a problem).. Now for the question... with the broken det sensor lead could the ecu be trying to go into safty boost but the EBC fighting that thus causing still being able to get to 13psi (as opposed to 6psi safety) and cause the boost to build ever so slowly - it doesn't really start building above 5psi till 4000-4500 (I used to be over 14psi @ 3000 rpm). besides this boost problem the car seems to be running fine - idle good, sound good.. everything besides BOOST N GO.... Thanks in advance to all... :zlove:
Having the safety boost solenoids hooked up with an EBC will only cause boost spiking. I would check to see if your EBC solenoid is working correctly. Best way to test is to disconnect the cable supplying the power to the boost control solenoid and see if the symptoms continue. Sounds to me it is open letting all boost pressure open the wastegates. With the det sensor wire, it depends on which one is cut. Only one wire actually gets to the det sensor and the other one just disappears half way down the harness and joins into the insulation sheathing. Only way to make sure is through datascan or do a self diagnostic test looking for a code 34.
Yeah am getting error 34.. would this cause the boost to build slowly though.. Also I have heard no harm comes from having the saftey boost soledoids still connected with an EBC.. is this not correct..
Have a think about how boost is increased, by making the turbine's spin harder and faster and the only way that can be done is sending all the exhaust gas through the turbine and not the wastegate. If the boost is building slowly either your engine is running like absolute crap, or the boost control solenoid is allowing the wastegate actuators to open to early. Safety boost solenoids are just an electrically activated gate, sends boost pressure through a restrictor (boost jet) when it is on and bypasses the restrictor to allow full pressure to reach the wastegate actuator hence allowing for minimum boost when it is off. Since you have a code 34 fault, the safety bost solenoids will have no power going to them but this will not change a thing with an EBC, if it is working correctly.
Code 34 would reduce performance even with EBC ...>> The ECU also uses safety fuel and ignition maps to "protect" the engine, so you will get less power and use more fuel. The code 34 could be contributing to the problem, so you should fix it first but I suspect you have a plumbing issue.
Problem found I think... Thanks for the replys so far guys.. I did a boost leak test and low and behold I had air pissing out the back of my EBC's boost controller under the hood. Mine is a HKS unit and has a air bleed valve at the back of it for venting excess air (according to the manual).. and air is flowing out of it so I am guessing stuffed boost controller.. my wife did say she thought the controller was rattling when she had the bonnet up the other day but wasn't doing it when I had a look... guess I'm up for a new unit..
