Can you solve my boost mystery?
- Thread starter Bluechulappa
- Start date
Your boost pressure will naturally increase when you free up the intake and exhaust, no getting around that. Stock wastegate is set to ~6psi stock turbo 5spds. With his boost controller he should still be able to lower it back to stock levels since the spring still allows for it. As for me my wastegate spring is set to 14psi so i cant do jack to get around it other than opening the wastegate door a bit or getting fuel mods. Make sure Profec Vacuum lines are 100% correct as well as the settings on the back of the Profec. If they are good then id move on to the wastegate. In any case if the stock WG spring is set to ~6psi thats when it should open.
~JDMMA70
~JDMMA70
So here is my wastegate door fully open...
And my DDP... Clearly the door can't open fully and its hard to tell just how far it opens but what should this have to do with over boosting? shouldnt it make the boost come on slower?
What concerns me is the wastegate arm.. I doubt it could even open fully cause of the dip stick pipe
I put pressure on both wastegates and they both open so wtf! I need help!
And my DDP... Clearly the door can't open fully and its hard to tell just how far it opens but what should this have to do with over boosting? shouldnt it make the boost come on slower?
What concerns me is the wastegate arm.. I doubt it could even open fully cause of the dip stick pipe
I put pressure on both wastegates and they both open so wtf! I need help!
My money is on the DP, you may have to grind it so it can open fully. It not opening all the way is what causes your over boosting problem.
Hook it to the down pipe and see how far it opens. It's not really rocket science to figure this out/rule out the WG. And while you do that you can see if it hits your dipstick, if it does, just bend it out of the way.
i know this would fry wires if done for too long but run it just down the block with no dp and see if it still hits fc, if you dont drive for long you should be alright
if you run your car with no dp, put a fire blanket on the firewall.. would help a littlebit. I'd just put heaps of chalk on the wastegate put the dump on, pull the wastegate actuator line, take dump off and check for chalk marks 
die grind your dump or hit with a hammer or cut and shut, whatever it takes
-bc
die grind your dump or hit with a hammer or cut and shut, whatever it takes
-bc
Well I tested how far the wg door can open with my DDP and spare turbo. This is the result.
So I would say the DDP is not preventing it from opening fully?
So I would say the DDP is not preventing it from opening fully?
change your hoses, I had this same problem and tested all sorts of things and almost ported the wastegate hole before I noticed I had a tiny crack in the WG vacuum hose. Like so small I didn't notice it putting it on about 4 times until I used a bicycle pump to pressurize it and felt air coming out.
How far will the wg actuator actually open the door? I used both my wg's and got the same result. They both open the door just slightly. Is that how it's supposed to be? I can't see the arm on the wg being able to extend the door fully open!
http://www.youtube.com/watch?v=npSHAbOWXIY
http://www.youtube.com/watch?v=KAGBQ9L-kAU
I figure since both wg's are doing it than it is normal?
http://www.youtube.com/watch?v=npSHAbOWXIY
http://www.youtube.com/watch?v=KAGBQ9L-kAU
I figure since both wg's are doing it than it is normal?
I see what he's saying. When he apllies pressure to the wastegate actuator. It doesn't open the wastgate door all the way. Even if he stuck his stock DP on how would that help. If the wastegate door is only opening a 1/4 of an inch how is the DP going to get in the way. Maybe I'm missing something. Does anyone have a spec on the travel of the actuator rod? Or maybe there's just not enough pressure built up from his air pump to open it more? I'm going to unhook my controller tonite and hook it back to stock and see what happens tomorrow.
Yea I will double check but all my lines are brand new anyways. I'm pretty sure it's gotta be a bad wastegate cause I've been reading and plenty of ppl have free flowing exhausts and other mods and are able to run the stock boost. I'm in the process of putting things back together. Should know by tomorrow if my spare wg has solved the problem...
Sweet I fixed it. Apparently it was my wastegate actuator cause I swapped my spare one in and now she holds 6psi in every single gear! Thanks for the help guys
u can go onto hks.com and buy i feul cut difencer or fcd and that will stop u from hitting fc of u can get i lexus v8 afm and bigger injectors but i would go witht he fcd because it is only 100 bucks or so. also try unpluging your factory boost guage there is a plug when u open the hood on the passanger side and it goes to a little thing about the size of a nano ipod its 1/2 way between the front of the car and the fender it says boost something on it and that should let u get about 14 psi
Ian, I must be thick today. I'm not sure what that portrays, but I'm sure it ain't complimentary! heh.
