VEMS and TurboSmart Solenoid

[GazzaG60]

think marc is meaning the solenoid frequency by dwell. i can see you getting pretty good results with the n75.

jonas went eboost for similar reasons to me. my N75 wasn't in best shape and the motronic way of delivering boost is not for me. i wanted consistant delivery with no fluctuation whereas my setup was not giving me that with the N75. i expect because it was end of life.

there are settings to help you hold 0nto boost with the eboost and they work ok. its essential you keep within the limit of the turbo though. often aftermarket boost controllers get bad press due to the user not knowing the turob well enough.

[A80Avant]

well according to the map of the GT3071R it is supposed to be able to hold up to 1.8bar to the red line and still be effective in power delivery.Problem is occuring on lower gears though where on 2nd and 3d gear you always get that boost dropping off.

Today that i took the car for a spin, i could keep the 3d gear relatively well,without problems in higher gears and with the settings of the N75 on VEMS being more accurate now,but still on 2nd i get a drop off from 1.8 to 1.5bar and on 3d about 0.1bar drop as well. I could settle with that for now,but im expecting some new hoses to try out the manual boost controller from turbosmart which i had all along.

Also i believe that if i had a stiffer spring installed(rather than the 0.4bar one) it would be much easier to tune without dropping the boost.
I havent tried the 034 spring yet.

[GazzaG60]

you will find its harder to make full boost in lower gears. not as much gas flows and load is lighter. less is generated basically.

im lucky to see over 1 bar in first if i dont launch hard.

boost dropping off at the tail end is usually down to 2 things.

1 turbo cant hold boost there.
2. the wastegate is venting too much to maintain boost.

is it still a standard size gate?

if so id go with the boost map or maybe settings relating boost to AIT or boost to RPM.

be careful of egt and AF rations changing when you up the boost. its that area that drains a stock pump dry. mine is fine until 4800rpm-5k then it nosedives the AF as the turbo starts to work. thats at 1.35bar.

[A80Avant]

i have the 044 pump which is as good as it gets for the pump and the injectors are good enough for 500hp on the 3.8bar FPR.SO fuelwise im ok.

i put it down to maybe more backpressure as well?

Im using the RS2 wastegate.Perhaps things would be much easier with a stiffer spring,because as i said,when i stiffen the spring up, pressure on the top end simply stays there.But i dont want a reaction from a spring that starts from 0.5 and gets to 1.5bar in the end.

Maybe the solution is the 034 spring afterall.

So far though, the latest settings i have used,seem to be adequate for now.Keeping it at 1.8bar and that is good for the turbo and the engine anyway.

[Bram]

Put in that 1.9 bar WG spring. Will make you happy

[A80Avant]

yeah, i think i will in the end.

went out a few more times. It just acts a bit better,but you can never keep boost on lowe gears.Always a certain drop.At least now it stays a bit more,so i wont push it anymore.

[Jeffer]

why cannot you tell jeffer?

The car is not yet running. So i've got no first hand experience with the setup of this solenoid. Couple of more weeks then I know more about it.

[A80Avant]

im currently flirting with the idea of getting the 4port turbosmart solenoid valve to see if i can manipulate it with VEMS and actually manage to control boost through that.
however i see that the 3 port one comes with the 2 different psi abilities, the 40 and 60psi. Would that be of any significance since vems will be operating the kpa depending on the sensor i have in the ECU?


also from what i see the solenoid has 2 wires that go to a specific plug on the boost controller. Im not sure which i should connect to which from the wire of the engine loom that goes to the N75 to the turbosmart solenoid so as the settings on VEMS can manipulate the valve properly

[Jonas_R]

im currently flirting with the idea of getting the 4port turbosmart solenoid valve to see if i can manipulate it with VEMS and actually manage to control boost through that.
however i see that the 3 port one comes with the 2 different psi abilities, the 40 and 60psi. Would that be of any significance since vems will be operating the kpa depending on the sensor i have in the ECU?


also from what i see the solenoid has 2 wires that go to a specific plug on the boost controller. Im not sure which i should connect to which from the wire of the engine loom that goes to the N75 to the turbosmart solenoid so as the settings on VEMS can manipulate the valve properly

Why would you go for the 4port valve? Just go for the 3port valve and hook it up running it in dual port mode. This mode is for cars with higher backpressure.

The 3port valve has 2 wires and you just connect them to the 2 wires that goes to the normal N75. Polarity is unimportant

[A80Avant]

i see.

40 or 60 psi solenoid, does it make a difference which one it is,since it is used with VEMS?

[Jonas_R]

i see.

40 or 60 psi solenoid, does it make a difference which one it is,since it is used with VEMS?

It is the amount of boost that the valve is made for. I would just go with the 40 PSI, I dont suppose your expecting do more then 40 PSI relative boost?

[A80Avant]

no not really but from a shop i found that both have the same price.

any shop recomendations? it seems that not many have the solenoids to buy only

[A80Avant]

i just went for the 40psi one(2.7bar) which would be more than enough, from aet turbos online shop. Ill let you know when i make any progress with VEMS on it.

[Bram]

Good boy

[A80Avant]

it is now done and checked. turbosmart solenoid can be used with vems succesfully.Ill post my settings later,but settings might differ from ecu to ecu. only use them as a reference/ starting point

edit:
pwm period: 16ms
map target
boost control reference position: 4/5
target offset: 12
off: 98kpa
P:250
I:5
D:45
PID integral limit: 125

infjet channel 7 enabled

Duty cycle:

2000:55.3
2500:65.1
3000:70.1
3500:70.1
4000:70.1
4500:74.9
5000:74.9
5500:78
6000:78
6500:78
7000:78
7500:78

rpm/map based boost set to 290kpa from 3500rpm.