949

i am currently using a t3/t4 turbo from greddy which has an internal wastegate.

the actuator is weak for my use, about 4lbs. im looking for one at about 12-15lb. is there one that i can get which will just bolt up or maybe with little modding to fit?

also, who makes greddy's turbo's? is it garrett?

HiProfile

All actuators work the same way, just with different spring rates and sizes. You could use another or preload your current if it's adjustable, but I'd really recommend using an MBC. A manual boost controller will let you run up to 13psi w/o any control issues, as most people can get 2.5x the spring pressure. Up to 20psi if you don't mind boost levels that waiver or drop slightly - and have a free-flowing exhaust.

Greddy uses both MHI and Garrett cores, IIRC. They even mix them, as in their b- and d-series turbo kits that use a 19T and 15G with T3 turbine housings.

TheShodan

iTrader: (14)

Some do. Most of the B series use Mitsubishi compressor wheels with Garrett cartridges and exhaust wheels in t25 turbine housings. The MBC is a much better idea than simply changing actuators, but there are limits to the GReddy actuator.

949

my problem right now is with either the boost controller or actuator.

i have the 4lb greddy actuator on the greddy turbo. im using the s300 hondata and the hondata boost controller. im at 70% and only 6.8 lb. so i dont think a manual boost controller is going to work.

HiProfile

You never mentioned an EBC before. Internal WG systems can require a much higher duty cycle to create the same boost level, due to a very restrictive exhaust. Also, the duty cycle usually isn't linear, the next 25% may double your boost.

If you want a brand-new actuator, most turbo resellers can get them from Garrett. You can also find them on ebay, etc, or off a used car such as a DSM or volvo. Most "junkyard" actuators range from 5psi to 15psi, 7-10psi being more common.


11psi, just add another threaded rod & coupler to get the right length:
http://www.atpturbo.com/Merchant2/me...gory_Code=WGT1

949

so let me get this straight.

for me to double the boost all i need is something with maybe 8lb spring?
i was thinking of getting something with maybe around 15lb just to make sure im covered.
but im not sure im thinking this out correctly???

with something say, 15lb on the spring, with a boost controller what will be the max it can do?


yes i want a brand new actuator but i would like one that would require the least amount of modding to make it attach to the turbo as possible.
so if garrett makes the turbo for greddy then would they have an actuator with an mounting braket that would attach to the turbo's current holes nicely?

(i want the look to be clean as well as function right)

m R g S r

I have the greddy actuator and with a turbo x's MBC I see 18lbs. But it does fall to 15lbs which kinda sucks, because it pulls much harder when you first get on it and the boost spikes up to 18! lol

Tony the Tiger

If your setup has a problem with boost drop, it could mean you have a restrictive exhaust, log manifold, a tube/fin restrictive FMIC, etc.. things that contribute to higher exhaust pressures.

If room allows, the best thing is to find an internal WG actuator that has the largest diaphragm. You'll see that some WG actuators are rated 8 PSI, but the diaphragm are smaller on some units, and some are larger. The larger diaphram simply means it has more torque and could depress a heavier spring even though the boost signal is at the same 8 PSI, versus a smaller diaphragm. That means a larger diaphragm actuator (rated at 8 PSI) has a spring that is physical heavier to combat against exhaust pressures and to prevent boost drop, meanwhile, it still only takes 8 PSI to move the wastegate and control boost.

949

which actuator do you have?
they have at least two that i know of.

949

besides these guys, any other places i can get a 11-15lb actuator for my greddy turbo?

http://www.atpturbo.com/Merchant2/me...gory_Code=WGT1