a GOOD electronic boost control

[JustenGT8]

Hmmm maybe see what price they'll do you for 2?

My main worry is just the single soleniode for the twin turbos.....i still have that power FC one which is the same type...reckon the thing would take the current load if i wire them up off the same feed....they wouldn't draw much would they?

[Admiral coFF33]

i use a 1992 HKS EBC , doesnt spike, set boost levels on the fly its got 3 settings:

Low High Custom

i turn a knob (slowly) and smash 3rd on private property to check boost levels.

IN THE GHETTOOOO

but hey , it works

$100 from Yahoo Auctions back in the day*

*when the aud wasnt dogshit

[timbosaurus]

Hmmm maybe see what price they'll do you for 2?

My main worry is just the single soleniode for the twin turbos.....i still have that power FC one which is the same type...reckon the thing would take the current load if i wire them up off the same feed....they wouldn't draw much would they?

Since both turbos are blowing into the same intake pipe, they should each see close enough to the same boost pressures, and I'd expect both gates to open at the same time.

Because of this, I'm planning on running a single vacuum line to the solenoid, then tee it out both wastegates. That's not too dodgy, is it?

[JustenGT8]

nah not at all....your turbos are nice and close though. I'm not that keen on the long lines i have to run with the single solenoide? Dunno what's worse,, long lines or extra complexity of x2 solenoides?

Issue i have faced to date with a manual bleed is being able to bleed off enough boost to get some kind of boost control......by the time i reduce the T to the gate enough to allow the bleed to do something there's no control left and i spike to wheelspinning oblivian

Do the soleniodes still need the reduced port T to the gate? I think they pulse to allow some boost thru to gate but also to bleed off as well? which suggests to me you would no longer need the T?

BTW looks like i just bought an Eboost? fark i can be an impulse buyer sometimes

[timbosaurus]

BTW looks like i just bought an Eboost? fark i can be an impulse buyer sometimes

Ahhahahha... was it an E-boost2? I like them

The PWM solenoid stops boost pressure flowing into the wastegate line until it hits the boost threshold (obviously). Once at the threshold it regulates the amount of pressure in the wastegate line to keep boost right (obviously).

What I'm thinking about (not so obvious), is what happens to that (eg) 1 bar of pressure in the wastegate line when you return to vacuum. As soon as the EBC see's less boost than the threshold, it will completely switch off the solenoid, which could lock that 1 bar of boost in the wastegate line forever and keep it open.

So I think you'd still have to have a small bleed/leak after the solonoid.

[JustenGT8]

Yah although i think that is built in to the soleniode...ie when the gate is shut it's bleeding to atm on the gate side? When boosting the pulsing is quick enough that this 'leak' doesn't really matter? I'm far from 100%, just vaguely recall someone describing that and seems to make sense?

[timbosaurus]

That would make sense. I'm sure someone thought of it before I did

[kaido]

Ive got an ID3 uras edition, it is the ducks nuts.
I cant fault it... its got overboost protection. works great, spools up so much faster than my last profec.
a graph that maps your boost over last 20sec of boost or so... really good to watch for spikes and diagnosing problems on the fly.

[JustenGT8]

Hmmm maybe see what price they'll do you for 2?

My main worry is just the single soleniode for the twin turbos.....i still have that power FC one which is the same type...reckon the thing would take the current load if i wire them up off the same feed....they wouldn't draw much would they?

I downloaded the manual of the interweb and yes it'll run x2 soleniodes in parallel...easy

[YLD-16L]

I'm planning on getting one Justen, just need to remember to call the mob during business hours.

Can't find any online (except one site, but i think they are confusing the names...), so have to call the number in the FF&R ad.

It looks like it will suit me, as I already have a nice gauge. I just need something discreet to keep the gates shut until max boost level, then use closed loop PWM to keep it there (hopefully if starts to close the gate again as boost drops off at higher RPM).

Timbo, if you give them a call quiz them on the inbuilt gain that it will use as I reckon if it's very aggressive at all and your turbos are very responsive you're going to have spiking issues in some situations. The next model up they sell isn't much more $$ if you buy it without the gauge package and the gain is adjustable - might be worth a look too.

nah not at all....your turbos are nice and close though. I'm not that keen on the long lines i have to run with the single solenoide? Dunno what's worse,, long lines or extra complexity of x2 solenoides?

Issue i have faced to date with a manual bleed is being able to bleed off enough boost to get some kind of boost control......by the time i reduce the T to the gate enough to allow the bleed to do something there's no control left and i spike to wheelspinning oblivian

Do the soleniodes still need the reduced port T to the gate? I think they pulse to allow some boost thru to gate but also to bleed off as well? which suggests to me you would no longer need the T?

BTW looks like i just bought an Eboost? fark i can be an impulse buyer sometimes

I think you'd have an issue with the dual solenoid models anyway given you've got a turbo on each side of the bay as the dual solenoids appear to be a single unit in most cases anyway, not two seperate unit able to be placed apart. Edit, so as you've noted just run two of the standard solenoids

Will be interesting to see how the eboost goes, lots to set up on it. You'll need a dyno or datalogs to do it perfectly unless your turbos are very well behaved.

What I'm thinking about (not so obvious), is what happens to that (eg) 1 bar of pressure in the wastegate line when you return to vacuum. As soon as the EBC see's less boost than the threshold, it will completely switch off the solenoid, which could lock that 1 bar of boost in the wastegate line forever and keep it open.

The solenoids have three ports, so on an internal gate setup with the EBC powered up and the solenoid being supplied with power but not pulsing it's shut off from the pressure reference but the third unused port is open, so any pressure in the line between the actuator and solenoid can escape to atmosphere.

In the event of a power loss to the solenoid the solenoid reverts to an open line from the pressure reference source to the wastegate actuator (fail safe design in the event of malfunction it reverts to base pressure boost levels), once the EBC sees the defined point determined by the gain setting or inbuilt parameters it then starts pulsing at the predetermined PWM for the target boost level to begin controlling peak boost. Once you shut the throttle and dip back into vaccuum it's a closed line again from the pressure reference but the unused port is open so no boost is trapped between the solenoid and wastegate actuator.

With external gates it's effectively the same but use the other port (the one that is venting). Either way you set them up they should revert to stock/base boost levels in the event of a solenoid power failure.


When the solenoid is pulsing to control boost it is "bleeding off", you can bleed this small amount off to atmosphere or back into the intake post air filter but pre turbo.

[JustenGT8]

Why are external gates different to set up? maybe if you use both ports but if just using the single port it should be exactly the same?

[YLD-16L]

Why are external gates different to set up? maybe if you use both ports but if just using the single port it should be exactly the same?

That's right, if you use both then you're pressurising the top of the diaphragm to create more boost so bleeding off less of the reference pressure = more boost

If you use it only on one port you are reducing the pressure under the diaphragm to assist the diaphragm opening so bleeding off more of the reference pressure = more boost


That's how I understand it but I'm not sure why one method is recommended over another, I've not owned and external gate to play around with it.

Try both and see what yields better control??

Edit: I think the most important thing is just to ensure in the unlikely event of a power failure to the solenoid it reverts to minimum boost and not max.

[JustenGT8]

The only reason to use both ports i reckon is that when plumbed correctly you can open the gate under vac and get much better fuel economy.

I'll give them a call to get their take on why dula ports give better control?

[YLD-16L]

The only reason to use both ports i reckon is that when plumbed correctly you can open the gate under vac and get much better fuel economy.

I'll give them a call to get their take on why dula ports give better control?

Might be good to save $3 on the trip to Dubbo

Let us all know what they say, I'd be interested to hear.

[JustenGT8]

Might be good to save $3 on the trip to Dubbo

Let us all know what they say, I'd be interested to hear.

LOL yeah not much err 'cruising' on the way to Dubbo....well not once you pass Mitches slow arse

towing this year this...a bit lame but i need the clutch to last a bit longer yet and there's enough stop start to add serious wear