Rb25 Actuator Options

[d.matho]

Hey guys, got an r34 GTT with a few mods including highflowed turbo from MTA, got it nistuned and only made 298hp due to the stock actuator letting me down *apparently its only 5 or 7 psi) and the boost controller only being able to bleed off up to 14 psi. anyways, im about to buy a new actuator and get it retuned to run something around 20-23psi, would it be better to buy the HKS actuator that runs at 14 psi and bleed off up to the desired amount, although that might be the limits of the boost controller, or should i look at buying a turbosmart actuator from GCG who customise the universal fit actuator for the RB25 and have them set it at around 16-18 psi, so that way the boost controller wont be reaching its limit. I've tried googling but cant find any steady info on which is better than the other.

Haha also I found those mamba tek actuators on ebay for $150 and they can put an 18psi spring through it. any reviews? they look pretty sketchy but doesnt hurt to ask.

[hypergear]

The boost tapper behavior does not fully depend on the weight of actuator, but actually depends on the wheel combination used as well as how free flow your engine system is. Most of Garrett GT style turbine inside an OP6 rear turn to have a boost tapper behavior working with an OP6 rear housing, which is why majority of people ended up getting a .82 rear for boost stability and more power.

Any of those actuators mentioned your self will do in terms of help in minimize boost tapper in certain extend. I would prefer the Turbosmart a like once which different weight springs can be installed.

[Dose Pipe Sutututu]

Get one as close as your targeted boost as possible.

The turbosmart dual port ones are great, however if money doesn't rain from the heavens for you the kingugawa / mambatek ones are pretty good too.

[WMDC35]

I'd go for the Turbosmart, it's easy to get the springs if you want to change them later & although nothing really goes wrong with them you can get diaphragms etc. Tried & proven.

Otherwise the Kando.

[zoomzoom]

Im using a kinugawa actuator, though I had to make my own bracket out of some thick right angle steel. The preload is easily adjustable via a threaded rod, and there's plenty of travel in the actuator, so the boost doesn't creep at the top end like it used to with the standard actuator preloaded on a high flow turbo.

[Missileman]

I've had the kando adjustable with a 1 bar spring, it has the same spring pressure as the stock rb25det actuator.

[d.matho]

whats the Kando actuator?

[Missileman]

kando/ kinugawa sorry

[Missileman]

I've had 3 actuators rb20 25 and the Kando / turbosmart/copy...

the spring pressure of the 25 is about the same as that of the Kando with 1bar spring, the difference lie in the respective size of their diaphragm.

I chose to keep the 10psi rb20det actuator which handles 1bar with a bleed valve quite easily.

How much psi are you going to need?

[-S-]

i thought the stock actuator for the rb25 is less than 1 bar... about .5 or .6 bar or 7 psi max?

[GTSBoy]

5 psi native. Bled up to 7 psi by the R33's ECU-boost solenoid.

[-S-]

Yup