How Many Boost Controllers Needed On Gtr

[Jpowys]

Sorry to ask what might be a dumb question, but how many boost controllers should be required on a 32 GTR (yes it is still running two turbos).

My mechanic has just installed two boost controllers as part of some work he has been doing on the car. He had first installed just one controller, but found that this did not work, so he has installed 2 now, one between each turbo and the actuator. Just wondering whether this sounds right?

Any help would be appreciated, a lot

[R31Nismoid]

You only need one boost controller if correctly setup.

He didnt do it correctly if "one" didnt work.

I would suggest another mechanic. He should know how to setup boost control on a GTR if he has any idea about twin turbo applications

[WARLORD]

one

[Slim Mat]

Agreed, one boost controller should do the trick. They only have one controller as standard.

Hey Jpowys

Edited July 12, 2007 by Slim Mat

[Jpowys]

Thanks guys, thats what i thought. Can anyone provide a simple diagram showing how this should be set up. here's a diagram of how it is currently (excuse thepoor quality)

Any help would be great...

[SilverECR33]

You can successfully set it up with 1 or 2, But as stated, if he was familiar with twin turbos, he could set it up with 1. which wouldve saved you some $$$

[GTS4WD]

The more the merrier I say..

For double points see if you can get 2 boost controllers PER turbo..

Again.. might be a silly questions..

..BUT..

If you have a boost controler PER turbo.. you can change each turbo's boost pressure..

so.. can you get one to come in early with a small amount of boost.. and another with a lareger amount of boost later? I.e sequential turbo?

..just a thought..

[SECURITY]

  GTS4WD said:

The more the merrier I say..

For double points see if you can get 2 boost controllers PER turbo..

Again.. might be a silly questions..

..BUT..

If you have a boost controler PER turbo.. you can change each turbo's boost pressure..

so.. can you get one to come in early with a small amount of boost.. and another with a lareger amount of boost later? I.e sequential turbo?

..just a thought..

that wont change WHEN the turbos kick in as they'll both be producing the same boost at any given psi. only difference is one will have a higher limit.

[GeeTR]

GTS - Hahah, nice try, though no

Sequential setups work because the turbos themselves are of different size / AR etc. An single EBC that allows you to control the solenoid through out the RPM range, and with proper gain control should grant you your wishes, and control the twins.

Edited July 13, 2007 by GeeTR

[Jpowys]

  SECUR1TY said:

that wont change WHEN the turbos kick in as they'll both be producing the same boost at any given psi. only difference is one will have a higher limit.

Secur1ty, could you please explain the part about one of the turbos having a higher limit?

Is there any problem with running two boost controllers? Or should i take it to someone else and get one removed and the other set up correctly? Or if someone can show me a pic i could do it myself

[SECURITY]

i was saying that if you're running 2 separate boost controllers it will be hard to determine which one is pushing more psi than the other unless you use 2 electronic boost controllers. with a single boost controller you'll have an even spread between them no matter the type. even if it spikes, it will spike evenly

for eg, 2 scenarios:

1st is the 2 boost controller setup.

lets say the boost gauge is reading 14psi. with 2 boost controllers you may not have an even spread as one turbo may be pushing 4psi, and the other 10psi. you cant tell.

this will cause one turbo to always be overworked.

but hey, at least you'll have 1 turbo in VERY good condition which you can sell to help with your rebuild.

2nd is single.

even spread, easily manageable. no dramas.

all you've got to do is get one of the vacuum hoses coming from one turbos wastegate actuator, then get a T piece and plumb it into the vacuum hose going to the wastegate actuator of the other.

[Jpowys]

  SECUR1TY said:

i was saying that if you're running 2 separate boost controllers it will be hard to determine which one is pushing more psi than the other unless you use 2 electronic boost controllers. with a single boost controller you'll have an even spread between them no matter the type. even if it spikes, it will spike evenly

for eg, 2 scenarios:

1st is the 2 boost controller setup.

lets say the boost gauge is reading 14psi. with 2 boost controllers you may not have an even spread as one turbo may be pushing 4psi, and the other 10psi. you cant tell.

this will cause one turbo to always be overworked.

but hey, at least you'll have 1 turbo in VERY good condition which you can sell to help with your rebuild.

2nd is single.

even spread, easily manageable. no dramas.

all you've got to do is get one of the vacuum hoses coming from one turbos wastegate actuator, then get a T piece and plumb it into the vacuum hose going to the wastegate actuator of the other.

Ahh i see what you mean with the different levels of boost. That was one of my concerns too.

I've revised my diagram according to what i understand you saying with the T piece etc. Would you mind having a look at the attached dodgy paint thing ive contructed and see if i've understood correctly? Is everything positioned correctly here? And do i simply plug the second hole created from turbo inlet 2?

Thanks again

Edited July 14, 2007 by Jpowys

[SECURITY]

yep, spot on mate.

[Jpowys]

  SECUR1TY said:

yep, spot on mate.

Thanks heaps, i'll give it a go!

[Slim Mat]

The controller really needs to be connected to both turbo intakes.

The other thing, I thought that wastegate actuators were connected to the turbo outlet.

Such as this one, because the daiphram is operated by air pressure which opens the gate.

Edited July 15, 2007 by Slim Mat

[SilverECR33]

what about boost duty?. doesnt this allow you to make the turbo work harder or less, to enable users to compensate for old worn out turbos etc or to create a better boost curve? with AVC-R

so you could have 1 set to come in early as possible, hit max boost , then taper. have the other duty lower, then later in the rev range - set NE points to induce higher duty with higher limit?

could this work?

[SECURITY]

  Slim Mat said:

The controller really needs to be connected to both turbo intakes.

The other thing, I thought that wastegate actuators were connected to the turbo outlet.

Such as this one, because the daiphram is operated by air pressure which opens the gate.

thats how all boost controllers work mate, only difference is that the max boost is limited by the wastegate actuator itself (i.e. what the spring is rated at in the WA).

to turn the boost up you add a boost controller between the boost FEED (which is anywhere on the inlet piping including the turbo itself) and the wastegate actuator.

[Beer Baron]

  silverbulletR33 said:

what about boost duty?. doesnt this allow you to make the turbo work harder or less, to enable users to compensate for old worn out turbos etc or to create a better boost curve? with AVC-R

so you could have 1 set to come in early as possible, hit max boost , then taper. have the other duty lower, then later in the rev range - set NE points to induce higher duty with higher limit?

could this work?

no it couldn't.

[GeeTR]

Solenoid "Duty" is the pulse rate to the solenoid (which dictates boost level)

"Gain control" is better described as the speed in which the EBC moves between the duty needed to hold the gate shut (so off boost) and the duty needed to maintain the set boost.

Gain controls the rate, or intensity in which boost builds to the set user set limit.

This is my understanding, until i learn otherwise

M

[heller44]

Secur1ty : Sl!m Mat was just trying to point out that the reference had to be taken from the turbo outlet, not the turbo inlet..

just to clarify for the original poster, as it differs from that mspaint drawing posted.

james.