ok so heres where i'm going to start, my car used to be shimmed with 4 washers giving me 10-11psi, so i decided that i would not go so ghetto and bought a MBC. Everytime i adjusted the MBC i would either not boost enough or overboost wayyy way way over. i was turning this knob just barely, and it still never worked so i went back to the washers. Everything was fine up until a few months ago when the car started spiking to 16psi. so i decided to take all the washers out and just run stock. THe car ran fine it sometimes hit 10psi but mostly only 7psi. SO i finally made the purchase on a greddy profec B, which i was quite excited to put in but even on the lowest settings my car is over boosting now. If i turn the unit off then its back to stock (7-10psi). is this just a sign of a shitty wastegate? should i just take the wastegate off and bash it with a hammer? its driving me insane.. all i'm looking for is a constant 11psi. any suggestions? let me clarify that there is no boost leak. thanks any suggestions?
greddy profec help
- Thread starter viper92086
- Start date
What excactly do you mean by overboosting? Is it not limiting the boost at all or just higher then you want (like 13 instead of 11psi)? I would check all your connections. maybe the vacuum to the silanoid? is it a used or new profec?
When you turn the unit off, it goes back to a stock setting as if you have no EBC. (I am running a PRofec b 1st version) What I do, is turn mine on LOW @ the lowest setting, this way I can run stock boost, w/ the better feel of the Gain adjusted on the wastegate. Then I set HI on the higher boost setting I want. If I remember correctly, HI setting is + 1.5x LOW. (L=7psi - H=10.5 psi)
its a used profec b (spec I) that i bought from another member. i just want the boost to be controllable, like some days it will be 7 some other days it will do 10.... but it seems as soon as i turn on the ebc the boost doesn't even cut off, this is the same problem i was having when i went MBC. isn't stock supposed to be liek 7psi? BTW bryanintexas, i guess i have the same one as u but when i put mine on the lowest setting possible on the low function it still overboosts (like 16psi is the most i let it go then i let go of the gas so it might go beyond that)
viper92086 said:
Sound like you may have a stuck solenoid. Have you tuned in/set the Gain feature?
is that the same thing as the balance? i'm about to go out right now, i'm going to try to get a video to show u guys what i mean. i also forgot to add that i tried the overboost mode and the standard actuator mode with no difference. btw can i unstick the solenoid?
heh went out to shoot the video and it kept boosting to a solid 10psi :aigo: so i have no idea, if anything else happens i'll keep ya guys posted, i guess it musta been a stuck solendoid like u said bryan, but who knows we'll see as the week goes. But here's one of the videos, actually the only video that came out clear lol. Yea i know about the check engine light it is code 52 and i actually reset the ecu after taking that video, but the results were the same so i dunno. The car does sound beastly on video :icon_bigg But onto the video.
http://video.google.com/videoplay?docid=-2594885638915763111&hl=en
http://video.google.com/videoplay?docid=-2594885638915763111&hl=en
car still does it, problem goes away after the car is driven for while which leads me to beleive it is still the wastegate. DOes anyone know how much a new one costs from toyota or if there are any alternatives to the stock wastegate? i prefer to get something new so i can eliminate any doubts
do let your car boost to 16psi...code 52 i believe messes with your f/c because when i have a code 52 i could hit 16 psi with out a sign of f/c...
code 52 is your knock sensors and because they are not working your car goes into a safety mode. it runs pig rich and pulls timing...your car should feel pretty gutless for what the boost SHOULD be doing. i would fix that first. you will notice a huge difference in engine response and you will also notice a ton more power.
Next i would check your vacuum lines to insure you do not have a leak. also make sure the compressor hosing fitting for the hoses is tight.
lastly i would suspect a faulty waste gate actuator. not sure what the price is for a new one but they are easy to get in good used condition.
on a off note. Some people with after market d/p's sometimes complained about over boosting and boost spikes. I can't remember what or why it happened but it may be worth looking into. i think it had something to do with the waste gate not being big enough. this caused the turbo to boost higher than it should...regardless of the boost controller being used. anyway something to look into if all else fails.
code 52 is your knock sensors and because they are not working your car goes into a safety mode. it runs pig rich and pulls timing...your car should feel pretty gutless for what the boost SHOULD be doing. i would fix that first. you will notice a huge difference in engine response and you will also notice a ton more power.
Next i would check your vacuum lines to insure you do not have a leak. also make sure the compressor hosing fitting for the hoses is tight.
lastly i would suspect a faulty waste gate actuator. not sure what the price is for a new one but they are easy to get in good used condition.
on a off note. Some people with after market d/p's sometimes complained about over boosting and boost spikes. I can't remember what or why it happened but it may be worth looking into. i think it had something to do with the waste gate not being big enough. this caused the turbo to boost higher than it should...regardless of the boost controller being used. anyway something to look into if all else fails.
thanks hellraiser. i got rid of the code 52 and its still the same problem, plus i won't get f/c because i'm maft in blow thru. altho the car does pull like crazy at 16psi.. its like a dream.. lol but i feel the motor is very unsafe at the level. the vaccuum lines are as tight as possible, even tried swapping out lines (all lines are brand new). I do however have a aftermarket suprasport elbow with a 3" DP, so i might have to look into that. BTW does anyone know how hard it is to replace the actuator without taking the turbo off? or does anyone have any pictures of a turbo that is not mounted so i can see what the clip looks like? maybe my asian hands could sumhow get that clip off.
If I remember correctly the actuator unbolts with 2 bolts and then the actuator arm just slides off the wastegate. I had to replace mine a while ago and I just bought a used one from someone the forums so I didnt price one from the dealership. Assuming that the BC is hooked up correct, and you are using all the right vacuum sources, I would guess that it is a bad actuator.
heres a picture of the turbo
http://www5d.biglobe.ne.jp/~lc80/mylandcruiser/tune1 006.jpg
heres a picture of the turbo
http://www5d.biglobe.ne.jp/~lc80/mylandcruiser/tune1 006.jpg
i found out toyota doesn't sell the wastegates individually, do u have a pic of that turbo showing where the actuator is attached to the wastegate?
http://www.mybluemr2.co.uk/CT26/2.jpg
its from a mr-2 but the wastegate connectin should be the same.
its from a mr-2 but the wastegate connectin should be the same.
my truck does the exact same thing with the greddy profec b. there are settings on the back that you can change. make sure you change those settings. i have an external waste gate setup, but i switch those white tabs around to "up, down down, up" ...you might have to do "up, down, up, down" check on greddy's site.
if he has the problem with or with out the boost controller...then the boost controller isn't the problem.
A boost spike or over boosting is caused by the exhaust pressure not being able to bypass the turbine. the waste gates job is to do just this. it allows the pressure to be released..and thus the turbine will slow down.
Now the are a few reasons this can happen...first and foremost a faulty waste gate or actuator. if the waste gate doesn't open...you will boost until your turbo literally can't push anymore.
the other reason is your waste gate is too small. there is too much exhaust and the waste gate can't remove all the pressure...or in other words the pressure over powers what the waste gate will flow.
the other reason would be that the waste gate gets a bad vacuum/boost source. this would prevent the waste gate from opening when its supposed to and this would tie into boost/vacuum leaks. For this i would double check that all the lines going to the waste gate/boost controller are in good shape. Also keep them as SHORT as possible. Or at least that's for mine. Also make sure the nipple on the turbo housing isn't leaking.
however...i would bet that the problem lies in your waste gate. Further more i would really check the vacuum source to it.
A boost spike or over boosting is caused by the exhaust pressure not being able to bypass the turbine. the waste gates job is to do just this. it allows the pressure to be released..and thus the turbine will slow down.
Now the are a few reasons this can happen...first and foremost a faulty waste gate or actuator. if the waste gate doesn't open...you will boost until your turbo literally can't push anymore.
the other reason is your waste gate is too small. there is too much exhaust and the waste gate can't remove all the pressure...or in other words the pressure over powers what the waste gate will flow.
the other reason would be that the waste gate gets a bad vacuum/boost source. this would prevent the waste gate from opening when its supposed to and this would tie into boost/vacuum leaks. For this i would double check that all the lines going to the waste gate/boost controller are in good shape. Also keep them as SHORT as possible. Or at least that's for mine. Also make sure the nipple on the turbo housing isn't leaking.
however...i would bet that the problem lies in your waste gate. Further more i would really check the vacuum source to it.
thanks man, i found out my boost gauge was faulty so that might have contributed it me thinking things were wrong, i have a new greddy waiting to go in during winter break and i will update u guys, thanks