Turbo Smart Dual Stage BC

[OnAll-FOUR]

Does anybody have any experience with the TurboSmart DSBC?

I can't get my car to hold a stable boost through the rev range. It will only semi hold a lower boost level at lower rpm, when the TVIS on the GT4 opens up then the boost steadily ramps up? Initially I'm only trying to mimic the original wastegate which would hold the factory boost solid all the way.

The setup is connected as shown in the following diagram. The thing I'm suspect of is the T piece they provide has a really small hole in it for their gate thing. This has a small one way valve that is supposed to help stop boost creep. I thought this might have been part of my problem but i took the gate out and it is still the same. Also slightly enlarged the hole which made a slight difference. Is there something else I have gotten wrong? cheers

[BeRad]

the gen 2 3sgte has 2 hoses coming out of the gate, 1 from the turbo and one heading towards the firewall if i remember right i had to block the one going to the valve/sensor Although i had an aftermarket ecu, i dont know if the stock ecu would like that if you have a standard one.

[OnAll-FOUR]

the gen 2 3sgte has 2 hoses coming out of the gate, 1 from the turbo and one heading towards the firewall if i remember right i had to block the one going to the valve/sensor Although i had an aftermarket ecu, i dont know if the stock ecu would like that if you have a standard one.

I belive the one heading back to the firewall was for the TVSV, I have blocked this one off so that should be covered. Althought do you know if that was the correct thing to do?

cheers

[JustenGT8]

Your plumbing is all good Ben.

Could be the T piece with the restrictor is too small?

Could be the lines are a little long.

Coudl also be that now you have upped the boost you are getting the dreaded DP induced creep as the CT26 is very sensitive to DP design...mostly as there's bugger all room to get the port for the WG flap flowing well.

Hopefully not the latter.

My external gates are very sensitive to the size of the T restrictor. 0.2mm is the difference between no bleed ability and massive boost spiking. I have run a turbosmart bleed on my Four though and it was fine.

[OnAll-FOUR]

Your plumbing is all good Ben.

Could be the T piece with the restrictor is too small?

Could be the lines are a little long.

Coudl also be that now you have upped the boost you are getting the dreaded DP induced creep as the CT26 is very sensitive to DP design...mostly as there's bugger all room to get the port for the WG flap flowing well.

Hopefully not the latter.

My external gates are very sensitive to the size of the T restrictor. 0.2mm is the difference between no bleed ability and massive boost spiking. I have run a turbosmart bleed on my Four though and it was fine.

I have started trying to bleed some off and increase the boost level. However I haven't seen any increase in the boost pressure or any change at all for that matter. Maybe I'm just being to tentative with winding up the boost dials.

I'll try a few things today, cheers for the help.

[JustenGT8]

Ah, no boost increase...i misunderstood.

In that case 2 things. Either you are being a girl or you're not getting enough bleed as the hole in the T is too large or your length of vac hose to the bleed is too long which can also result in not enough bleed.

Again, on my external gates, just running the bleed lines to a central point will reduce boost from 17psi to 14psi......can sometimes be tricky to setup so keep playing and see how you go.

[OnAll-FOUR]

Ah, no boost increase...i misunderstood.

In that case 2 things. Either you are being a girl or you're not getting enough bleed as the hole in the T is too large or your length of vac hose to the bleed is too long which can also result in not enough bleed.

Again, on my external gates, just running the bleed lines to a central point will reduce boost from 17psi to 14psi......can sometimes be tricky to setup so keep playing and see how you go.

Well it looks like to some point I was just being a Girl I turned the low range boost dial up a long way and I finally got an increase in boost. Kept increaseing it and on the last few clicks of the low range setting I almost got back the factory 8psi and the boost creep appears to be reduced.

However this means that I cannot take it any higher in this low setting which sort of dissapointing as It doesn't give me much room to increase this in future.

overall the low range boost bleed gave me approximatly an increase from 6 to 8 psi. I was under the impression the increase would be greater?

[JustenGT8]

Well it is the 'low' boost setting Not supposed to give much above the stock spring pressure i guess?

If you want a higher base pressure you can shim out the actuator with washers.

[OnAll-FOUR]

I will rig up the control for the high setting tonight and see how I go then

One thing I found counterintuitive was the location of the restrictor vs the bleed hose.

The restrictor is before the bleed on the recommended setup from turbo smart. I would have though the restrictor would be after the bleed, helping convince the air to go down the bleed tube?

[JustenGT8]

Are you sure?

Your assumption is correct in that the restriction should be after the bleed line to do just as you say and provide an easier flow path to the bleed.

Having it before makes no sense at all as it restricts both lines equally so almost may as well not have it at all?

I have the same setup you have boxed in the shed so i'll have a look at mine. Maybe they put the 'arrow' sticker on the wrong way? unlikely but....?

[OnAll-FOUR]

Are you sure?

Your assumption is correct in that the restriction should be after the bleed line to do just as you say and provide an easier flow path to the bleed.

Having it before makes no sense at all as it restricts both lines equally so almost may as well not have it at all?

I have the same setup you have boxed in the shed so i'll have a look at mine. Maybe they put the 'arrow' sticker on the wrong way? unlikely but....?

Yeah I am really sure. When I got it, (which was secondhand) this is how it was configured.

That would explain alot of things.

EDIT: Had another good look through the turbosmart manual and the ball and spring were definatly installed the wrong way arround. I'll have another play tommorow.

cheers

[OnAll-FOUR]

Well got it all working

I'm not sure how it all works internally but it does .

Bought a new t-piece ($30 from tweakit) that hadn't been fiddled with and just installed it.

My first problem was that i didn't disable the TVSV initially, then once I just didn't turn up the boost dial enough

Cheers for the help guys

[JustenGT8]

No probs mate. So how does she go?

[OnAll-FOUR]

Pretty good actually, throttle response is still pretty strong, maybe a little better than the standard setup. I will be interested to see if the gated t-piece changes the power delivery at the Dyno Day coming up .

It is now just a question of how might I want to turn up the high setting. Any suggestions? I suppose I should raise the fuel cut from the standard 14 psi for a start. I'm thinking of getting a local shop with a 4wd dyno to give it a few runs in a 'controlled' environment and see what it can be safely raised to.

[JustenGT8]

Non GrpA right?

Should be 12psi cut but alot of variability out there...hard to tell if it's just the various boost gauges though and accuracy varies alot.

Anyways, with any of the simple 'defenders' the ECU just goes full rich so fueling is oversafe if anything. Timing doesn't get retarded though so that's the biggest concern.

I'd be inclined to stick with 14psi and maybe just do a zener diode boost cut mod so you don't hit the cut on cold nights. Safe enough and about as far as you want to push with the stock ECU and topmount IC.