gazza, when we meet at the lakes, i will have the laptop with me so you can see the settings i use with VEMS and the OEM N75.I think that with a bit of trial and error you can get the same results with the boost controller vems comes with to use with any solenoid.
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i expect you can but in all honesty i prefer my controller. if its not broke.....Comment
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i was looking into the e-boost and e-street just now and i have a question.
the correction factor that these units have for boost drop off on higher rpm, how does it work really?
I mean,i get a boost drop on 3d gear and 4th gear,but not at 5th and 6th gear.So if we were to use the correction factors that e-boost have, would that apply on all gears,and hence on higher gears you might be getting more boost as rpms rise?
im going to be finetuning the VEMS settings on the OEM solenoid hopefully today,and by that i mean try to get it to work properly on 3d gear by playing around with the PID settings.
i also have the boost tee turbosmart valve which i could try and use,but then i would have one thing less to play with in VEMS and that is the TPS/boost responce,which will be effectivelly disabled since boost will be manually controlledLast edited by A80Avant; 2 August 2009, 15:43.Comment
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A correction should not be necessary to use unless you pushing the turbo beyond it's limits?
My point is that in eboost2 terminology this function can be used to push beyond the "99" setpoint value, since the "only" thing it does is raise the setpoint by a procentage over a rev range. If you where using say setpoint RPM mapping this function can't be used. But to answer your question it would work on all gears and would raise the boost more in some gears if what you tell me happens. However if you where using eboost2 I don't believe you will get this problem at all.
Anyhow you can actually setup the Eboost2 so that you have BoostGroup (BG) to every gear. However this requires a micro switch on each gear and then a small PCB board with a micro chip and some software. I was thinking of making this board for fun, I have the software written in C++, I just need some time to learn how the micro controller works and how I program it (different language).Comment
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the thing is that i get that problem with VEMS and Motronic,meaning having the boost drop on lower gears. The N75 valve is fairly new,and it was happening when it was practically new originally.
With the motronic,the way around that was to get the original wastegate spring torgued up,so that on low revs i had 0,4bar of mechanical boost,but on higher revs,it went up to 1.5bar of mechanical boost,more likely because the spring was totaly compressed. That way i had better boost control with motronic reaching the specified/requested boost values.
With vems,i get that as well,but by changing the PID settings or offset settings on the N75 control i manage to have better results.So im assuming that a bit more time in that department will enable me to get the desired level of boost control.Of course, the use of a different wastegate spring makes things different,but in any case i must try and get around it.
Maybe eboost could act and react differently but before buying it for 400+GBP i would like to test the VEMS boost control settings first.Comment
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Well I had loads of problem with the boost on motronic and my tuner tried everything without it ever working properly.
So instead I went with eboost2 and it was all good afterwards.
Anyhow Eboost2 with 2.75 bar maks boost is 338£ from www.scanturbo.dk best money I ever spend
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I have just ordered the Perrin/TS solenoid valve and will try to get it working with VEMS. Marc told me possibly only a small modification is needed in VEMS with the dwell, although I have totally no idea what that means
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dwell and boost controller? i dont follow...Comment
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It is freakin' solenoid valve I can't see why you should do anything special, of course it might need slightly different settings to the N75 valve but that should be it.
They do exactly the same thing.Comment
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Dunno if its any help, but I'm using a SMC vt-307 12v valve with my VEMS. Cannot tell if it works fine, but it was CHEAP
Externally it looks similar to the turbosmart solenoid....
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why cannot you tell jeffer?
i tried some different settings today and managed to get all gears working more or less properly,except 6th.Needs still a bit tweeking.I also managed to do this with completelly winding out the wastegate spring and allowing it for only 0.4bar of mechanical boost.
poor wife and RS2....i guess they had enough for today...Last edited by A80Avant; 2 August 2009, 20:19.Comment
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im also looking into some documents about PID control and how it really works,so that i can fiddle around with that a bit more.Comment
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