right i have my suspicions about the accuracy of the boost controller.

 

i check by using a mechanical boost gauge,stock boost gauge and the controller itself.

 

 

under boost the boost controller max's out at 5.6 psi the stock gauge goes up to where 9 psi should be......

 

this is really starting to piss me off as i dont know what to believe!

the stock boost solenoids have been removed from my car.

 

well that makes the job much easier then..from the bleed valve right down to the actuators.

can i confirm how the actuators work

 

the actuators contain a spring at a set psi rating (z32 i have read in a lot of forums was 6psi)

 

the actuators will open once 6 psi of boost is achieved unless there is something to stop the actuators seeing 6psi eg a boost controller

 

the boost controller is essentially a bleed valve which vents the excess registered boost to atmosphere so that the actuators are "tricked" into staying closed to build more boost.

 

this means the actuator only ever receives a maximum of 6 psi and the rest is vented off.

 

this means the system is allowed to build more boost as the actuators is tricked into thinking there is less boost in the system then there actually is

 

so in a 9psi system 3psi is bleed away from the acutator line

 

14 psi 8 psi is bleed away from the actuator line

 

 

am i on the right lines???

Not sure about your question above, sounds about right though. I had a similar problem as you, boost controller giving a different reading to my greedy boost guage and stock gauge. Stock gauge is rarely accurate anyway. On mine it was the boost sensor for the boost controller (greedy e-01). The sensor was faulty, which made the boost controller do strange things. The thing that lead me to the conclusion was when i turned the engine off, but didnt turn the key all the way off. The greedy boost gauge slowly rose to 0, as did the stock gauge, and the boost controller rose to -6psi, with the engine off. Tried all the above sujestions, boost leak, loose pipes, changing location of sensors etc.

Not saying this is your problem, but worth trying. Maybe see if someone locally has the same boost controller and try their sensor.

Hope this helps.

Cheers

Danny

Not sure about your question above, sounds about right though. I had a similar problem as you, boost controller giving a different reading to my greedy boost guage and stock gauge. Stock gauge is rarely accurate anyway. On mine it was the boost sensor for the boost controller (greedy e-01). The sensor was faulty, which made the boost controller do strange things. The thing that lead me to the conclusion was when i turned the engine off, but didnt turn the key all the way off. The greedy boost gauge slowly rose to 0, as did the stock gauge, and the boost controller rose to -6psi, with the engine off. Tried all the above sujestions, boost leak, loose pipes, changing location of sensors etc.

Not saying this is your problem, but worth trying. Maybe see if someone locally has the same boost controller and try their sensor.

Hope this helps.

Cheers

Danny

Thanks for the reply, i did check that when i turned the engine off last the boost controller gradually went up to 0 , none of my local z pals have a boost controller unfortunately, i have finished my boost leak tedter now so am gonna check it over the next couple of days, failing any positive conclusion i want to take her to jeff if he can squeeze her in one weekend soonish

Right update from recent testing

 

Checked for boost leak, found 2 the system now holds psi

 

Settings

channel 1 38% boost ratio gain 8 gives 9 psi boost

 

Channel 2 47% boost ratio gain 8 gives 10.7 psi boost

 

 

Compaired to what I was getting

 

(15 ratio boost 5 gain and got 6 psi

 

30 ratio boost 5 gain and got 6.6 psi

 

40 ratio boost 5 gain and got 7.6 psi

 

50 ratio boost 5 gain and got 9.3 psi

 

55 ratio boost 5 gain and got 10.2 psi)

Boost controler guage is the one to beleave [EBC digital readout].Nissan guages are renowned to be wrong. That includes OEM,speedo, tacho,oil pressure,fuel & temp guages.uselly read fast or slightelly high.OK for a quick referance to what is going on. Thats why after market Lab Instrument quality guages & race quality guages cost a mint.

Right update from recent testing

 

Checked for boost leak, found 2 the system now holds psi

 

Settings

channel 1 38% boost ratio gain 8 gives 9 psi boost

 

Channel 2 47% boost ratio gain 8 gives 10.7 psi boost

 

 

Compaired to what I was getting

 

(15 ratio boost 5 gain and got 6 psi

 

30 ratio boost 5 gain and got 6.6 psi

 

40 ratio boost 5 gain and got 7.6 psi

 

50 ratio boost 5 gain and got 9.3 psi

 

55 ratio boost 5 gain and got 10.2 psi)

 

 

i would turn your gain up as well ... IE for 9psi + gain should be around 15>20