Guys we got one of the Forge Actuators for the Evo in and decided to slap it on our car to see if it would cure the boost falling off problem with our car at high boost. All i can say is wow! I had no idea it would perform the way it did. We went with the Heavy Spring in the actuator and the light spring in the Unos Boost controller and damn, built boost to 25psi with easy and it stayed there like a rock. We managed to run it a few times and the local 1/8th drag strip and using a stock turbo and a mostly stock car with 264 cams it ran a 7.8 @ 89 with a 1.78 short time. Boost was rock solid the whole time even when we left the track doing some top of 4th and 5th gear pulls it didn't fall off at all. All in all i am totally impressed with the $170 mod for the evo.


Here is a picture of the actuator off of www.Stikiller.com

 

isn't it kind of dangerous to run 25psi on the stock turbo on a mostly stock car? or was this on race gas?

 

come on man, of course this was on race gas C16 in the tank and ARP head studs with cams. I have a full list of the cars mods but im waiting on john to look it over before i post it.

 

i run 24 psi all day long

 

So why is this an advantage over just using the MBC? Are you using an AFC rather than a flash that will stop the boost taper?

 

So can i run like 30 psi at 7500 rpms?

 

The stock actuator causes boost taper to some degree, regardless of your form of boost control.

 

Probably make more power if you only ran 21psi. 24 is a bit much on pump gas. 24psi on race gas, though, would probably put you in the 360 range...

 

Nice. Might have to add this to mine, im tired of 22psi at 7800....i need 25!!!!

 

Got any before/after boost logs?

 

Here is some information I posted in another thread:

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The actuators are designed to be upgradeable units and are available built with 1 of 4 different springs to achieve a desired base actuator setting.

Our springs are color coded and I have listed their estimated settings below.

Green - 5-10 PSI
Yellow - 10-15 PSI
Blue - 14-18 PSI
Red - 19-24 PSI

(all ranges are based on the levels of adjustment within the turnbuckle at the end of the actuator rod)

Depending upon which spring is used and whether or not a mechanical or electronic boost controller is used, you can typically use a lower setting on your boost controller while achieving the same, or higher boost output than when using the OEM actuator and the same settings on the boost controller. While using the OEM boost control solenoid, you will not notice any increase in pressure as the solenoid will just bleed off any additional amount you are trying to make.

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To make the above statement a little easier to understand:

Assume, for argument's sake, that your OEM actuator has a spring tension of 10 PSI and you are using a boost controller to achieve 21 PSI. Essentially, your boost controller is delaying the signal to your actuator and adding 11 PSI.

Now, let's say that you switch to one of our actuators and use the Blue colored spring (14-18 PSI). If no changes are made to the settings of your boost controller (left at an 11 PSI increase) you will now be making at least 24-25 PSI.

You can now turn your boost controller down to get back to 21 PSI.

This allows for a wider range of adjustment within your boost controller as the new uprated spring in the actuator is taking over more of the work.

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Another nice feature of the units is that each individual component can be replaced if required, whereas the OEM actuator becomes a paperweight if any part of it fails requiring that an entirely new unit be sourced.

All of our products are manufactureed in-house at our facility in Gloucester UK under ISO Quality Control Standard 9001 and we offer a Lifetime No Hassle Warranty on all of our products ensuring that any problems will result in a repair, a replacement, or a refund.

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Many thanks to GSC for their support of our products and willingness to test them to such extremes on their own vehicles.

Our entire Evo product lineup is available through GSC.

Give them a call!

1-843-852-2727

 

When we first put it on we left the boost controller alone and the car went to 30psi. we didn't stay in it because of the stock head gasket so i don't know what she will do at 7500rpms but i would guess it would hold it.

I am not a "Flash" fan and you wont find any of our cars with a flash. we like to tinker with the car to much to have one set flash. will a flash stop boost taper to some degree yes but at high boost no way the gate will be forced open and nothing a boost controller and flash can stop. only an upgraded waste gate or actuator will work.

 

Id like to see a dyno of before and after of this actuator. Im sure the mid range is affected drastically. I know when Buschur used the external wastegate to hold boost up top he gained some nice top end but lost tons of power in the low-midrange. Either way, Id like to see the losses and gains! Dyno PLEASE!

 

Anytime mike whats next Intercooler and fuel tank


Greg