twin stage boost?
Turbo Mini Forums

as the title just wanna know if anyone has a twin stage boost setup that works electronically ie push a button to double the boost, been looking at th turbos on avonbar ?700 is a bit too much for me there must be an easier way, i've seen similar kits on demon tweeks these any good?

Just use the standard boost solenoid off the Metro. Wire it up and have a switch in the car, hey presto ! higher boost at the flick of a switch.

Phil.

WWW.TURBO-MINI.COM

I've had this diagram on my computer for some time



with this setup you need a solenoid with one input, two outputs

how can you do two stage boost with a solenoid off a metro with only one input one output?

isn't it just like an on off valve in the line?

set your actuator to the lowest boost pressure then have a simple on-off solenoid to have your "high boost" setting.

id use a bleed valve before the solenoid to fine tune the high boost setting

in fact thats what's above... that has the exit from the wastegate T'd into two. with the one bleedvalve open its low boost, open the solenoid and it "activates" the 2nd bleed valve to a higher boost setting.

seems like a lot of expense when you can just twiddle the one bleed valve tho i do like the idea, like TD says boost is controlable by your foot.

Dan

take it the nedle valve is a bleed valve, are they not missing another exit as most have 3?

just to raise an old subject chaps

is the diagram above using the stock metro turbo bleed valve?
if so for me to have 10psi on high boost i'd put a bleed valve where the check valve is

i would'nt mind twin stage boost in the most simple way possible for my lil daily, i'd like it to remain the standard 4 psi around town & then at the flick of a switch have it 10psi rather than the stock 7psi

i take it i should rolling road tune the car at each boost setting to get the most from it & keep the mixture/detonation in check!

cheers again all, hopefully its the little mods like this that'll make my daily drive economical, pokey enough at times & fun when the turbo mini is'nt running as it should!

Edited by clubminiflip on 23rd Feb, 2010.

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

there is a twin stage kit out there by turbosmart or something like that, a friend had one on his tomcat worked well

Just do as Iain says -quick and simple -and it works !

Hi, for some reason i still cant get my head round this..

At the moment i have a BMC in line from the turbo to the actuator set at 18psi - what i want to do is run 2 vacuum hoses from the turbo housing, one to the actuator set to the lowest boost setting from the actuator, the other to the metro turbo solenoid (guess this has an inlet and an out let).

im not sure how to plumb the MBC in to the other side of the solenoid.. surely this needs to sit inline? do i link this back into the turbo to the actuator line??

Does this pic help?

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Its no good having to pipes in parallel Mark, you will only see actuator pressure, unless you have a solenoid in each line, so that one shuts as the other opens.

Its easier to do with a bleed valve rather than an MBC. As you can use 1 simple solenoid.

To use the MBC i think you would need a 3 port valve or 2 seperate as I said above.

sorry about this i think im being a spaz..

makes more sense with a bleed valve.

so i need a 2 port solenoid and a 2 port bleed valve? the bleed valve will sit after the solenoid then just vent to atmosphere set at the desired boost level?

think most of the bleed valves i have seen have 3 ports..

Still think my way is the easiest lol :p

Cheers - what i couldnt undersatnd was where the other side of the bleed valve went.. on a 3 port valve i always though the needed to go in line.. but as your pic shows 2 of the prts just vent then?

thanks again.

Yes, just think of it as a leak point.

^^^ neither did i, cheers guys.

finally got it!

What are people using as restrictors?

If something is worth doing, it's worth doing half of.

Has anybody found a cheap solenoid valve that will allow you to bleed a good amount of boost? I tried a rs turbo one last year but it was too restrictive!

glad you 2 have asked these question as im starting to look like a right retard.

also why is the restrictor important? i dont use one atm..

Could you not put a restrictor inline then you wouldn't need to bleed so much signal off Aaron? This is why I am asking about restrictors.

If something is worth doing, it's worth doing half of.

The idea of the restrictor is so the boost is more likely to travel out via the bleed valve, rather than down to the actuator.

Starmag, we have always used the stock metro units with good results. The cossie AMAL valves are also useful.