With my Profec B Spec II in "OFF" the MAX boost it displays is near 10PSI :eek: (well 9.9PSI to be exact) I understood that with the EBC OFF, MAX boost equates to saftey boost of 7PSI but not saftey "Mode" so the fuel and timing maps stay normal.

 

What could cause this, is it possible I have bigger than stock tubs :confused:

 

CheerZ

Paul

Wastegate stuck open?

I thought the waste gate valve was pre set at 10 psi if everything failed and that the boost controler causes a leek of presure to fool the waste gate valve that it was only running at no more than 10 psi all the time.

 

But I'm ready to be corrected as I aint an expert.

stock tubs are set to 9.5psi IIRC. the solenoid valves to the wastegate are what limits it to safety boost.

Wastegate stuck open?

 

that would give you lower boost pressure!

Mine hits 18-20 when off. So I try not to leave it switched off, ever.

stock tubs are set to 9.5psi IIRC. the solenoid valves to the wastegate are what limits it to safety boost.

 

Ah ha, that would make sense. Would it be possible to set the Profec in say Lo to go lower that 9.5 - 10PSI or would that be it's minimum ?

without the boost solenoids, minimum boost is regulated by the wastegates.

Mine goes into safety boost when switched off 7psi.

without the boost solenoids, minimum boost is regulated by the wastegates.

 

So, please correct me if I'm wrong and I think I get it.

 

With the stock solonoids connected the ECU OPENS the wastegates to give Saftey boost (when there is a fault) to 7PSI. If the solonoids were disconnected and no EBC, MINIMUM is stock PSI at 9.5PSI as that is what the wastegates are set to. So with an EBC connected and OFF and solonoids disconnected you get the same, 9.5PSI as that is what the wastegates are set to. So 9.5PSI is the lowest your gonna get regardless of what the EBC is set to :confused:

 

I think I've just confuesd myslef :duffer: LOL

Mine hits 18-20 when off. So I try not to leave it switched off, ever.

 

I was getting that kind of reading because I hadn't disconnected my stock solonoids

So, please correct me if I'm wrong and I think I get it.

 

With the stock solonoids connected the ECU OPENS the wastegates to give Saftey boost (when there is a fault) to 7PSI. If the solonoids were disconnected and no EBC, MINIMUM is stock PSI at 9.5PSI as that is what the wastegates are set to. So with an EBC connected and OFF and solonoids disconnected you get the same, 9.5PSI as that is what the wastegates are set to. So 9.5PSI is the lowest your gonna get regardless of what the EBC is set to :confused:

 

I think I've just confuesd myslef :duffer: LOL

 

dunno! im fooking confused now!! must stop drinking LOL!! DUFFER?!!!? :rofl:

dunno! im fooking confused now!! must stop drinking LOL!! DUFFER?!!!? :rofl:

 

:confused: :headvswal :cry: :rofl: :o

stock wastegate actuator pressure is 7 psi or approx. 0.5 bar

when connected and activated, the stock boost solenoids bleed of air so the wategates open up 2.5 psi later at 9.5 psi

 

>> I understood that with the EBC OFF, MAX boost equates to saftey boost of 7PSI but not saftey "Mode" so the fuel and timing maps stay normal.

 

this is correct...but this is ONLY the case if you have disconnected the stock boost solenoids.

if you haven't, the ECU will interfere and activate the stock solenoids and increase boost to 9.5 psi

that would give you lower boost pressure!

 

Doh! Yeah now I actually thought about it :D

I know what I meant LOL

So it sounds like you might still have the boost solenoids connected?

this is correct...but this is ONLY the case if you have disconnected the stock boost solenoids.

if you haven't, the ECU will interfere and activate the stock solenoids and increase boost to 9.5 psi

 

Now this is confusing me.

When I first fitted the Profec B II I "forgot" to disconnect the stock soloniods and was getting 18 + PSI :nelson: When I disconnected them all "appeared" well and was getting what most people get on various settings. I then tried with the Profec OFF and was getting 9.9 PSI. So Now Im really confused

In Post #3 here http://www.300zx.co.uk/forums/showthread.php?t=110382 are what I have disconnected, I am "assuming" these are the correct connectors

what boost was it running before you fitted the EBC ?

 

or in other words: any chance it still has boost jets in the hoses to the wastegates ?

what boost was it running before you fitted the EBC ?

 

or in other words: any chance it still has boost jets in the hoses to the wastegates ?

 

I used to have 1.2mm boost jets fitted and believe it or not I "think" I was running around 15odd PSI :shock: but when I fitted the EBC I made sure I removed them.

Have you tried removing the stock boost solenoids completely and running new lines from the EBC solenoid to the actuators? It could be that one of the solenoids is leaking slightly even when disconnected. Also could be a split in one of the stoc lines so replacing them completely will rule this out.

 

How long are the lines you've run? Are they equal length? Too many questions? lol

 

Cheers,

 

Andy

Have you tried removing the stock boost solenoids completely and running new lines from the EBC solenoid to the actuators? It could be that one of the solenoids is leaking slightly even when disconnected. Also could be a split in one of the stoc lines so replacing them completely will rule this out.

 

How long are the lines you've run? Are they equal length? Too many questions? lol

 

Cheers,

 

Andy

 

 

Now that is a very interesting question Andy. I had a look at where the stock actuator lines go and I thought 'fook that, I'll just tap in to the existing actuator lines and plumb that back to the Profec actuator' as my hands, arms and patients aint that small LOL. As for the distance to the Profec actuator valve I had to mount it near to the passenger side head light under the nose panel so the lengths of all the lines are "almost" equal give or take a foot or so.

 

Any help there Andy ?