Disgusting Boost Creep Problem!!!

[ALLeyesONmyGSX]

so i have a ported evoIII turbo, ported exhaust manifold... ported o2 dump... (all additional mods are my vechile profile) and i still have a major creep problem... im using the profec B spec II boost controller... now i know evoIII turbos do tend to creep... but im starting to believe my boost controller is now malfunctioning... i have it set @ 12 PSI on low boost and @ redline im hitting 24 psi... the reading is accurate because the manual boost gauge and the electric reading on the profec's screen is the same... is it just the turbo or is it the boost controller ? ... if i were to get a larger turbo, (RS49T , RS60T) would i still have the same problem ? thanks

 

[neuro]

so i have a ported evoIII turbo, ported exhaust manifold... ported o2 dump... (all additional mods are my vechile profile) and i still have a major creep problem... im using the profec B spec II boost controller... now i know evoIII turbos do tend to creep... but im starting to believe my boost controller is now malfunctioning... i have it set @ 12 PSI on low boost and @ redline im hitting 24 psi... the reading is accurate because the manual boost gauge and the electric reading on the profec's screen is the same... is it just the turbo or is it the boost controller ? ... if i were to get a larger turbo, (RS49T , RS60T) would i still have the same problem ? thanks

Try bypassing the Profec solenoid and directly connect your boost source (compressor outlet elbow?) to the wastegate actuator. The actuator should open at 9 psi. Make a run and watch your boost gauge. Technically, if you hooked the boost lines up on the solenoid correctly, you should be able to turn the Profec off and be at the stock boost setting as if the solenoid didn't exist. Powering mine off results in 9 psi all the way to redline.

If it's still creeping, it's not the Profec. At that point I'd check the operation of the actuator or check the flapper to see if it's binding or not opening all the way. You didn't mention what kind of porting you got on the turbo, so if you didn't get the area around the flapper ported, but ported the turbine inlet and outlet and are using some kind of monster O2 housing, it's probably not bypassing enough exhaust energy around the turbine when the flapper opens, causing the creep.

If the boost stays at ~ 9 psi, check your connections on the Profec's solenoid and run through the setting procedure again. Setting the Profec B-Spec II is a pain in the ass...you have to experiment with the gain and set gain settings til it's right. How do you know it's set for 12 PSI?

 

[superflyjmysnk]

I had the same problem when I first installed my evoIII with a setup similiar to yours. Mine ended being the wastegate actuator was sticking shut and after messing with it corrected the problem. If your boost without the profec in the loop still soars try checking the wastegate and actuator to make sure it opens and isn't catching on anything.

 

[superflyjmysnk]

I just realized you had a 02 dump, at what boost level do you hear it open up?

 

[ALLeyesONmyGSX]

it opens up @ around 3800 - 4000RPM... as far as the boost level... i havnt gotten an accurate look @ it... but its around that RPM range

 

[93jdmlaser]

I had a horrible boost problem on my evo 3 and went to an external. When I took it off to get the flapper welded I noticed that where the flapper end met the actuator arm was bent and was hitting the turbine housing. This was only letting the flapper open half way. It was a random thing I didnt check. Love the external thou

 

[rowlex]

here's how to fix evo3 boost creep, it sounds DOPE too... I like it MUCH better then the noise of the dump I had...

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