EVOIII WG Problem?

[daren_p]

When I first had my mbc installed I could boost more then enough. When I installed my greddy profec type s the most I can boost now is 18 psi with the high setting turned all the way up (gain is about 1/3 of the way up, I could get abit more boost by turning this up but then I get huge boost spikes between shifts & the boost oscillates) So initially I though I had a problem with my ebc. So I disconnected the pressure source to the wg and I could hit 21+ psi. Next I connected the wg directly to my ic pipes. With it hooked up this way I would initially see 8 psi when the turbo first spooled & then would creep to 12 psi by redline. Is this the normal wg boost setting for the evoIII? I thought the wg was 12 or 14 psi? I believe the way the greddy unit works is that it is a multiplication of the wg pressure, something like 2.5x so that would work out about right. Is there something wrong with my wg? I would like to run about 20 psi on the street and about 22 psi at the track.

 

[oldman]

daren, I told you to get a Hallman. I'm assuming a leak test was already done?

 

[daren_p]

daren, I told you to get a Hallman. I'm assuming a leak test was already done?

Ya I know, but I wanted to have shinny knobs in the car and 2 boost levels that I never switch between

Yes I have done a boost leak test. I do have a leak at the tb shaft seals but it is very small. You can't even hear it till about 15 psi, I don't think that small of a leak would make much of a difference? I have new shaft seals just haven't gotten off my ass to install them.

 

[oldman]

Ya I know, but I wanted to have shinny knobs in the car and 2 boost levels that I never switch between

If I can remember correctly from the other thread, the reason you went with an EBC was to avoid the possibility of boost spike and boost spike is exactly what you got.

You can figure out if the problem is the actuator or boost leak by applying compressed air directly to the actuator. If the actuator moves at 8psi, it's the actuator. If it opens at a higher psi, it's probably boost leak related.

 

[daren_p]

If I can remember correctly from the other thread, the reason you went with an EBC was to avoid the possibility of boost spike and boost spike is exactly what you got.

You can figure out if the problem is the actuator or boost leak by applying compressed air directly to the actuator. If the actuator moves at 8psi, it's the actuator. If it opens at a higher psi, it's probably boost leak related.

The ebc is working fine for me, no boost spikes with the gain set where it is. Only spikes when I turn the gain up alot, which is normal. I just need more boost

I will try hooking the wg to an air source to see when it moves. I did hook the wg up to an air supply when I first got the turbo just to see when it starts to open & how far it moved & if I remember correctly I think it did start to open right around 8 psi & then open abit more till about 10-12 then that was it, went up to about 16 psi but it didn't open any further. So 8 psi is low for the evoIII actuator? I know the flapper is held firmly closed with no pressure on the wg.

 

[oldman]

The ebc is working fine for me, no boost spikes with the gain set where it is. Only spikes when I turn the gain up alot, which is normal. I just need more boost

I will try hooking the wg to an air source to see when it moves. I did hook the wg up to an air supply when I first got the turbo just to see when it starts to open & how far it moved & if I remember correctly I think it did start to open right around 8 psi & then open abit more till about 10-12 then that was it, went up to about 16 psi but it didn't open any further. So 8 psi is low for the evoIII actuator? I know the flapper is held firmly closed with no pressure on the wg.

I'm not sure exactly what the spring rating is but the most I have seen, with the pressure source hooked up directly to the actuator, are right around 10-12psi. Maybe it's suppose to be 8psi and people who are reporting 10-12 just have boost leaks, why not give FP a call and see what they say?

 

[daren_p]

Well it looks like my wg does start to open at 8 psi & then stops moving by 11. So is this the norm for the evo wg or is mine defective? Also is there any way of gettin more boost from this wg, since its not adjustable? Would crushing it abit work, like you do with a bov?

 

[oldman]

Well it looks like my wg does start to open at 8 psi & then stops moving by 11. So is this the norm for the evo wg or is mine defective? Also is there any way of gettin more boost from this wg, since its not adjustable? Would crushing it abit work, like you do with a bov?

8 psi sounds a little low but FSM stated that stock 14b actuator is rated at around 8psi and most people reported 10-12psi as well so I can't tell you for sure if your actuator is defective.

I also don't know if crushing it will work like crushing a bov. Due to the fact that you're able to boost past 21psi leaving the actuator open, my oppinion is that the EBC is what's stopping you from boosting higher, I know that's not what you want to hear.