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Gt3076r Iw Need Help To Achieve 21 Psi Flat Line

conan7772

By conan7772,
in Engines & Forced Induction

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conan7772 Mentor

conan7772

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Nice work!! Thats very good going, my large can actuator is due to arrive this week :bunny:

Hey Lithium has that box arrived yet.

Looking forward to your results after the rigmarole you've had with prv's and ebc's and so on.

JonnoHR31 Grand Master

JonnoHR31

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ok so shipping from ATP is $95 - f**k that!!! Is that what you paid conan? It would cost them $20us max for express

I spoke to MTQ they have a "small can" 19psi actuator there for $135 does that sound like it would do the job?

I am getting my car tuned in a couple of weeks and want to try remove every possible weakness before it goes on the rollers

RB30DET with internal gate XR6 GT35R currently holding 15psi with the standard actuator but next tune i want to up it to 22psi so thinking I will need the higher PSI actuator

What is the benefit of "Large Can" ?

i have a spare small can 19psi sitting here tha'll i'll post to you for $134.99. ask mtq to price match that shit

Lithium Grand Master

Lithium

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Hey Lithium has that box arrived yet.

Looking forward to your results after the rigmarole you've had with prv's and ebc's and so on.

Haha cheers mate, me too - obviously :laugh: The big can actuator sounds very promising... though its a fair bit of boost on the stocker RB25! :)

The actuator is coming back from the US with a mate of mine, he actually bought it while he was over there and threw it in his luggage so no freight :laugh: He left the US on Wednesday so I guess I should be able to grab it this weekend.

dano4127 Veteran

dano4127

Posted
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i have a spare small can 19psi sitting here tha'll i'll post to you for $134.99. ask mtq to price match that shit

funny you mention it the one they have is in perth!

Are you trying to say it shouldn't cost $135?

JonnoHR31 Grand Master

JonnoHR31

Posted
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na thats about what they cost new. i got given a 2nd hand one for free from a mate because he thought it was a 1 bar, which is what i needed, but turns out its 19psi, bit too much for me at the time.

limpus Mentor

limpus

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^^^Thanks mate...

Just out of interest...i'm running a 3076R on a 2JZ (so its similar to a 3076 on a rb25/30)...and i've managed to get the car tuned but its still running the standard small can actuator that the turbo comes with...i've attached the graph of boost response below...it seems to be ramping up to full boost by 3300rpm and holding 18psi perfectly...i was wondering if you guys think there will be more gains in boost response with a large can actuator?

post-24077-1259989953_thumb.jpg

JonnoHR31 Grand Master

JonnoHR31

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take the vac line off the actuator and make sure the gate stays shut then see what rpm you hit the same boost at. dont keep going tho. thats a pretty nice boost graph already tho

limpus Mentor

limpus

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take the vac line off the actuator and make sure the gate stays shut then see what rpm you hit the same boost at. dont keep going tho. thats a pretty nice boost graph already tho

Thanks mate...i'll give that a go sometime...its pretty responsive as is but if i can get full boost even sooner that would be great...i went with this setup mainly because i wanted response and midrange anyway...

I just remembered that i'm acutally running next to no preload on the actuator at the moment too...i might shorten the rod slightly to see if there are any gains too...

limpus Mentor

limpus

Posted
Posted

^^^ Thanks...i know that...it also increases the pressure on the flap so it takes more before it starts to crack open...

I actually gave the actuator rod a couple of turns today...boost response seems a tad better down low...might keep going a turn at a time till it starts to creep upwards...i guess a big can actuator might not be needed for now...

limpus Mentor

limpus

Posted
Posted
very nice boost curve there limpus!!!

what kind of power you making?!?

Power is very disappointing at the moment...only at 280rwkw at 18psi...this is through a restrictive 2.5" muffler...when I find another exhaust system i'm happy with i'll hit the dyno again for a retune...but at least for now its pretty responsive for a daily...

  • 1 month later...
Lithium Grand Master

Lithium

Posted
Posted

Another happy user of the big can actuator, here :D Well at least so far...

I took it out for a blat yesterday with it connect, and with my pressure relief valve and AVC-R completely removed from the picture and preload wound right down. With it like that, it hit around 13psi peak which was nice to know.

I then wound some preload into it to get it up to around 15psi, and this is where things started looking really good. Without any extra boost control I was able to reach 1bar by around 3700rpm. This was impossible with the old actuator without removing the hose!

I decided to leave the messing around with the boost control to see if I could make it climb to 16-17psi with any stability (I couldn't reliably with the old setup) for the morning commute, which resulted in me being able to give some words of wisdom to others who are bad in the morning.

DON'T replumb your boost control setup in the morning if you are not a morning person. My vacuum hoses are too short to reach from the AVCR solenoid to the actuator now as I split them to put the pressure relief valve in between. Because I wanted to play, I just wound the pressure relief valve right down (I triple checked I was winding it the right way, and I was) and used it to join the hose so it could reach and all seemed well.

I went out and gave it a quick squirt - which resulted in this: Moby2bar.jpg

Oops. Nothing departed block or anything, so hopefully no harm done - in theory I have a boost limit of around 18psi so the rest of it should in theory have gone into the plenum but not joined with any fuel to make bad stuff happen. Still a bit of a fright though!

I went back to the engine bay and remembered the pressure relief valve (unlike regulators) have to be aligned with the airflow, otherwise it will be permanently closed. My bad. I spun it around the other way and went for a slightly more tentative drive, and to my joy the thing seems to spool every bit as well as with the pressure relief valve in there - but once full boost is hit, it holds much more consistantly!

So far so good, next stop... dyno tune :)

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