greddy profec spec 2 nightmare

[LamaRossa]

finally got greddy profec spec 2.........

spike all over the place.......... cant get constant boost

on my 90 turbo.......... pretty stock........ bad actuator??????????? how can i test that...............

with the profec offf im running stock boost fine............. no spike constant 6 7 psi

im about to give up

set @ 20 %

set gain 8 psi

warning 12 psi

L 7%

spike all over the place...........

even when i set the gain to 6 psi it hit 6 psi then hi rpm spike and hit fuel cut....

my lines to the actuator is about a foot and a 1/2 both ways to turbo and actuator............. is this too long??????? causing spikes????????????

also the port on the boost controller soleniod NC should i cap that off or is it a bleeder hole???

 

[str8_6]

I forgot how it hooks up, but I had major issues with the profec b also. switched over to manual control and worked perfect. I would look into how to test the solenoid.

 

[LamaRossa]

1 washer shim my wastegate

boost about 7 8 psi still spike hit fuel cut without the boost controller hooked up means i got a boost leak somewhere//

this sux i hate fixing car...............

 

[speedfreak]

sounds like you just need to play with the settings a little more, i had mine at like 50% and like 25 or 35 for set gain which i think is when it starts to spool, i had to find a good road to get mine right but i had no spikes or drops, with a stock system, most importantly don't go over 12 psi until your upgraded.

 

[CajunKenny]

Set the gain to 0 and see what she does.

I've got a small spike (1-2psi) as soon as it hits my desired max boost; but, that's it. No spikes after that.

Here's my last dyno run for reference.

 

[LamaRossa]

i def had a boost leak... somewhere... stock psi 6 it runs fine but sometime 5th gear pulling 3000rpm feels like its about to fuel cut when theres a load or it does fuel cut with stock boost with out any boost controller so im convinced i have a boost leak somewhere,,,,,,

thanx guys

 

[gaboonviper85]

You should be seeing black smoke and smell fuel while boosting if you have a boost leak...make a boost leak tester.

 

[LamaRossa]

whats a boost leak tester??????????????

i try searching guys.......... i have a boost leak somewhere... i try checking all my hose with soap and water and try break cleaner while car idle i sprayed it to see if idle goes up manifold all the valves... intake...

shim waste gate 1 shim hitting 6 7 psi with no boost controller and still hitting fuel cut 4500 rpm 2nd gear never mind third gear...\


wtf

not happy maybe a bad actuator???? too slow to open waste gate.. its got over 200k miles... but i did the bike pup test it did open... def not leakng wastegate

 

[suprastanger507mgte]

Boost leak tester..you can make your own as well. Im sure you are pretty handy.

http://www.z1motorsports.com/product_info.php?currency=USD&products_id=1867

 

[OneJSupra]

Did you follow the guidelines I sent you? Here's what I recommend.

Example:
Your Desired boost: 12 psi
Your Wastegate Spring set: 8 psi
What boost is your fuel cut?: 13 (assumming 13psi)

Target set boost = 20% (start with this and then increase by 2%)
Gain = 10
Start Boost = 8 (psi)
Warning = 13 (psi)
Limiter = 10% (10% of 13psi = 11.7 psi)
Turn LAST BOOST = ON (so you can record the peak boost)

Remember, if you set the GAIN and Start BOOST too close to your target boost you will get SPIKES. Now start wit 20% target boost. Test it. Check your LAST BOOST recorded. If it is below 12psi, add 2% more, If above drop 2%. If your boost is at 11.xx psi leave it.

Test again. G/L.

I followed the same logic on my buddy's mk4 and we got it dialed in at 17.8 psi with no spikes at all.

 

[LamaRossa]

thank you for the responses i think def have a boost leak

with the profec turned off... 1 shim on the waste gate i still hit 6 psi in 1st gear and fuel cut spike 8psi in 2nd gear around 4500 rpm...

so i need to fix fuel @ 6 psi throughout all the gears then i'll plug and play with the ebc but i just cant find the damn boost leak.....

boost leak tester tomm is a must... will post result,,, thanx guys

 

[LamaRossa]

thank you for the responses i think def have a boost leak

with the profec turned off... 1 shim on the waste gate i still hit 6 psi in 1st gear and fuel cut spike 8psi in 2nd gear around 4500 rpm...

so i need to fix fuel @ 6 psi throughout all the gears then i'll plug and play with the ebc but i just cant find the damn boost leak.....

boost leak tester tomm is a must... will post result,,, thanx guys

WHERE DO I START

huge boost leak for months now....................

hose from compressor to ic pipe all dried up and crack hardly hanging on

im surprise i was able to boost around town 6 psi and spike fuel cut sometime

greddy profec is working perfect

thanx guys 15.7 psi im happy as ever

have a good one

thanx for all your time.............

lamarossa