No EBC run off the ECU anyway, only ones like the AVCR need pick ups from things like rpm signal etc... for gear judge.
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jamiebennett81
Guest
but its not directly wired off the ECU though right, as its essentially running from the N75 and just needs power?
No, it just needs live and earth.
It runs instead of your N75, the solenoid which comes with it replaces the MBC you have now.
Just leave the N75 plugged in as you have now. If you, i'll take pics of mine for you.
It runs instead of your N75, the solenoid which comes with it replaces the MBC you have now.
Just leave the N75 plugged in as you have now. If you, i'll take pics of mine for you.
With three lines you have in from charge pipe to the mbc, exhaust which is the line at 90 degrees to the in goes from mbc to the wastegate and atmosphere which is opposite the in line goes into the tip but can also be left to just vent.
You should find out what your actuator pressure is for reference. Unplug n75 with mbc removed to find out for sure. Unscrew the mbc and look inside so you understand how it works aswell. Spring will make little difference unless there isnt one on there in which case you should put it on.
I cannot believe that your mbc has a range of only 0.5 bar which is 7psi unless the distance between it totally in and out tiny. One turn can be the difference between 3psi on some I have played with which when they have nearly 20 turns is alot of adjustment. I also still do not see how the ebc will do any better than your n75 if it was working correctly as it is the sme thing but one is programable by you and the other controlled by your ecu so by who mapped the car and if it is requesting but not making then I dont see how it will change this to the extent you want.
You should find out what your actuator pressure is for reference. Unplug n75 with mbc removed to find out for sure. Unscrew the mbc and look inside so you understand how it works aswell. Spring will make little difference unless there isnt one on there in which case you should put it on.
I cannot believe that your mbc has a range of only 0.5 bar which is 7psi unless the distance between it totally in and out tiny. One turn can be the difference between 3psi on some I have played with which when they have nearly 20 turns is alot of adjustment. I also still do not see how the ebc will do any better than your n75 if it was working correctly as it is the sme thing but one is programable by you and the other controlled by your ecu so by who mapped the car and if it is requesting but not making then I dont see how it will change this to the extent you want.
jamiebennett81
Guest
thanks mate, yes, seems pretty straight forward. same connectivity as the MBC, all be it now an electric version
Just called Forge, my theory was right in the MBC and its not winding out enough
there is a spring supplied with it (similar to the Forge 007p DV with different colour springs), which is to be used for higher rated applications i.e. stg3 tuned cars like mine. so it needs to be taken apart, the different spring added which will allow for higher boost to be run!
!!!will give this a go, but once the EBC arrives this will be fitted instead, and the MBC sold instead
so its just the way the MBC is setup which appears to be the restriction right now
pj, the N75 is the standard valve, which sometimes can be restrictive to the boost, as you get different lettered versions i.e. J, H etc with varying aggresiveness for boost. however the N75 IMO is not good enough to control the boost and of course does not have the adjustability in it like the MBC or EBC
Thought something like this would be the case. The forge valve I have set up has ALOT more adjustment than 0.5bar. Do check it is plumbed in right though as it will still work to a degree with the exhaust and atmos the wrong way around.
I know what an N75 is! What im struggling with is why yours on your just under 300bhp car cannot control the boost well enough when they can on cars with higher power. How do you think the n75 isnt good enough to control the boost. It works exactly the same as an ebc, they are both just solenoid valves, but you do not control it the ecu does. There is no reason it shouldnt be able to control your boost if being controlled correctly.
thanks mate, yes, seems pretty straight forward. same connectivity as the MBC, all be it now an electric version
Just called Forge, my theory was right in the MBC and its not winding out enough
there is a spring supplied with it (similar to the Forge 007p DV with different colour springs), which is to be used for higher rated applications i.e. stg3 tuned cars like mine. so it needs to be taken apart, the different spring added which will allow for higher boost to be run!
will give this a go, but once the EBC arrives this will be fitted instead, and the MBC sold instead
so its just the way the MBC is setup which appears to be the restriction right now
pj, the N75 is the standard valve, which sometimes can be restrictive to the boost, as you get different lettered versions i.e. J, H etc with varying aggresiveness for boost. however the N75 IMO is not good enough to control the boost and of course does not have the adjustability in it like the MBC or EBC
You mean it came with a different spring and you never tried it!?!
I have to say that I've been through 3 N75 valves on my car now and it's like a boost lottery. First valve would surge, second valve ocerboosted and the third I'm now running will boost randomly high and low.
Most odd. I'm also going down the EBC route partly to rule out another variable. I've tried everything else.
Can always sell it on if it doesn't help.
Most odd. I'm also going down the EBC route partly to rule out another variable. I've tried everything else.
Can always sell it on if it doesn't help.
jamiebennett81
Guest
sorry, did not mean to be patronising, as i am sure you know what an N75 is
indeed there is no reason, but does the MBC not prove something, that with running just the N75, I could only see 1.1bar as a maximum, and now with the MBC, I can already see 1.2 bar, and more adjustment to go once the new spring is fitted
this alone points out an issue with the N75 as it is restricting the boost which the MBC is instantly allowing for more play
You mean it came with a different spring and you never tried it!?!
Hindsight is a wonderful thing Rob
I looked at the spring last night, and put it to one side. I am sure you have found with cars, that sometimes the solution stares you right in the face and you think nothing of it at the time until the aftermath!!
oh well, at least the EBC will allow for more control and functionality etc, in the car as well, instead of having to keep manually adjusting it
to be continued........
jamiebennett81
Guest
I dont think the N75 is that smart
you will see boost spikes as specific N75 valves are more aggressive than others as you well know
but at least with the EBC it gives a more clearer level of control. Even a mechanical device such as the MBC iS smarter as already its allowing higher boost to be run, and as said pointing out a clear issue with the N75 without not being able to control, sustain or meet the requested boost
each car is different, and for some it may work, but in my case it clearly is not, so the sensible solution seems to be to fit an MBC or EBC, and so far, it has bought me a step closer to a resolution, and with further tweaking I am positive I will get there now - tis all a learning curve
Jamie the mbc is not smarter than the n75. The ecu controls the n75 and if the valve is in good working order then the ecu is what cannot control it well enough and not smart enough to. The mbc is a very crude form of boost control and by no means smarter...its probably the most basic form. Essentially you are creating a hole for boost to leak through so the map increases airflow to try and get the requested boost. This is why you are getting more boost. Very very basic and also a very easy way of pushing parameters in the map as they are 'fooled'. This leak is just constant with the mbc and variable with the n75/ebc.
Simpler is often more effective though. N75 goes in the bin along with N249, N112, SAI, EVAP - over-complicated nonsense.
N75 goes in the bin along with N249, N112, SAI, EVAP - over-complicated nonsense.Simpler is often more effective though.
Very true! At the same time though some of these things are for safety and simpler doesnt always do safe does it.
jamiebennett81
Guest
that could be a key statement there, if it is in good working order, and I would not waste another £60 buying another N75 which may not work and be faced with the same issue, when I know an EBC will most likely fix the issue in this case
I understand the safety part of the N75, but so long as the EBC is correctly used, within the correct parameters then there should be no issues....
furthermore (and going on what I have been told) if I do exceed the safety limit on boost, then it will hit limp mode.....I hope!
If you got charged £60 for an N75 you got ripped off. Theyrange from £25 to £45 for C,F,J and H varients any of which should be fine for your car.
To get more boost the ebc is going to have to be set outside of the map parameters or it wont get more boost which is not as safe as the n75 but you shouldnt get limp mode depending on the deviation variation and limits in the map.
Race N75 is just the H version with the part number scrubbed off. Cheaper direct from the dealer.
I like the idea of the EBC being able to back boost off, control spikes etc with a reliable solenoid. The map is supposed to do this, but often can't as N75 fails to keep up or breaks in my experience.
I like the idea of the EBC being able to back boost off, control spikes etc with a reliable solenoid. The map is supposed to do this, but often can't as N75 fails to keep up or breaks in my experience.
jamiebennett81
Guest
bought one a long time ago, but it was £60 last time I looked, so not sure on the prices now
two very good reasons why to get one, I still think the standard N75 is incompetent compared to an N75, and that was proven last night. as Moff said, for smoothness if anything
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