We got the forge acutator from sharif. it only came with 2 springs. USED installed the green one first, and then the yellow. Tuning this car has been very time consuming and frustrating at times. now that the car is making the power that it does, i'm a satisfied customer.

 

Btw, i took it to a dynojet and on the c-16 race map it only put out 420whp. it was on a 90 degree day and the mobile dyno operator didn't have a fan for airflow. i'll probably dyno on a dyno dynamics so i can compare numbers. i know it won't be exact, but should be in the 400+whp range.

 

blitz dual sbc type s

 

I know its expensive But i believe that a HKS EVC 5 boost controller will fix your problems, Is there anyone have these issues with the HKS boost controller?

The reason is because the HKS BC uses a stepper motor instead of a selonoid, its the only boost controller of its type and the best at holding boost.

Sell your BC for 300 or so and spend another 200 to pick up the EVC 5, Thats just my opion do some research and see if it might be a good idea.

-George

 

had i chosen the EBC that is what i have chosen. i am a hard core hks beleiver. however the shop that did the install chose the blitz. i will speak to them about this. i thought they were all the same

 

we have triple check for boost and exhaust leaks ,none were found , base on the last test we did,this test was on the forge actuator with the green spring installed,the rod been shortened to obtain proper preload ,and we have disconnected the hose to the waste gate actuator , got the car on the dyno ,and the mint we hit 6 PSI the waste gate arm will open and we would loose 50% of the boost ,dropping to 3 PSI , so my logical conclusions are as follow

1- defiantly not a boost leak ,if the actuator was not opening and we were still loosing boost then ,yes maybe a boost leak ,but this thing work like clock work ,waste gate open boost drops ,

2- same conclusion for the exhaust leak theory ,no exhaust leaks what so ever ,for a turbo to drop boost due to an exhaust leak ,I think your not going to miss that noise ,

3- hks boost controller vs.. blitz ,had great success the sbdc type s up to 36 PSI it does work ,and if we are disconnecting the hose to the actuator and still loosing boost ,by doing so we just eliminated any boost control issues .

4- in the initial tuning of the unichip ,I have noticed that all duty cycle setting in all rpm range were max out , witch seem to be a little unusual ,(this turbo kit was removed from one car and installed on another car ) I kick my self in the *** for no verfing boost on the first car before removing the turbo kit .

forgot to mention that we did install the next spring up in the actuator ,all that did make the peak boost go to 11 -12 PSI and then drop 50% to 6 PSI at redline .
we also removed the waste gate flapper to insure proper seating ,it did appear ok .

next I m going to install a exhaust back press gage on the exhaust to confirm exhaust back press ,we will see . maybe the tuning gods will have some mercy on me

Sam

GT MOTORSPORTS

 

the shop that did my work dropped the exhaust to see if there was a restriction with my fujistubo exhaust. the boost stayed constant through the rpm range. so wwe ended up going with the jic which had less restriction. james at car version 2 in DE is the installer/tuner on my car and he has EXTENSIVE knowledge with this kit on my car. maybe you can give him a ring in the morning. i know you installer guys like to figure things out on your own but he has gone through all the trials with this kit and has made decent power with mine(aps st with cams and UTEC) and another customers car(aps st with rev up motor, unichip, and aps 3" exhaust).

 

this kit is not ver consistent. bullitproof you and i have the same exhaust, so i know mine doesnt have much restriction. forge sent me 4 springs, guess they werent sure what i needed, they werent familiar with the kit at the time and they used my actuator as a template to build the ones you can buy now. so if anybody builds the motor and needs the 25psi spring i got it.

i say wire the flapper shut like i did, boost held just fine.

*******that was a joke, please do not do that*******


GTM, did yall inspect the flex joint, im telling you, you cant hear it leaking.

 

I have lit a candle and am saying prayers.

 

i looked as best i could with what little light i had and it looked clean enough to eat off of. i will look again today with a flashlight.

 

How much are the springs?

 

i dont know, you can go to the site and see, if you need one im not using ill give it to you.

 

the green and yellow springs came with the actuator sharif sent me.

 

Yah i have faith in Sam, hes a very trustworthy guy and i know he has the skill and the fervor of getting our cars in tip top shape. I called GTM today, left a message for Sam. I really feel bad because he works mad around the clock, and i can see that he is really dedicated. I am getting a new exedy clutch soon and new guages. I also was wondering if i can get more power, i thought my numbers were a bit low but low 300's must be disheartening. Also i blew my clutch today while racing an M3. God i feel like **** cuz he thinks he can still beat me. After my clutch install, im gonna run him again and see. In the mean time, i am looking for more power.

 

i made 385whp on a dynapack with your mods.

 

got the car all dialed in (with forge actuator and 9 to 15 psi spring) and had it dynoed yesterday. first pull was good according to Sam. it made about 340whp and 350tq. then 2nd pull was less and by the 3rd pull boost was again dropping to ZERO. at higher rpms and when the motor is warm the wastegate just opens.

WHY!!!

can the new external wastegate cure this problem?

will something like this cure this problem?



"Supplier's rationale:

The reason this type of down pipe works better is because the exhaust coming off the turbo wheel is spinning extremely fast and whipping in a circle. If the exhaust comes off the turbo wheel and enters a much larger area it becomes more turbulent, slowing the exhaust velocity; also when the wastegate opens, the two turbulent exhaust gases fight each other causing more turbulence. By keeping the exhaust in a pipe similar to the size of the exhaust wheel and separating the wastegate; you dramatically speed up the velocity of the exhaust gases. Thus helping the turbo spool about 500 rpm sooner then an open pipe design. The wastegate separator bolts to the down pipe and fits in the turbo exhaust housing creating a perfect circle for the exhaust to exit like an external wastegate turbo."

should i just replace the turbo? is that even an option?

should i drive the car to mexico, blow it up and collect the insurance money, buy a new z and go with twins?

why do the turbo gods hate me?

 

^ Not sure if this is an option, but maybe give a call to some of the other installers who have had good luck. I have no idea what's going on in your situation, but hopefully it resolves soon! Maybe Sam can call Tuan to brainstorm some ideas? Seems like he's done everything possible though.....I also had boost issues, but after using a different spring and tweaking it, Tuan had no issues at GRD.

 

call richard at dynocomp, he installed and tuned the kit on my car originally. dynocomp.com. just tell him it was the kit on rob from vegas' car, he'll remember. it was the first ST install they did.

 

ok, thanks rob. i will give him a call today. do you happen to have the number?

 

480-596-0500 and ask them if my replacement APS parts are in yet