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Member |
Ever since I put my boost controller in I have had this problem- When Accelerating my boost will continue to climb and once it hits the peak boost it drops back down till it settles in the 14.5 psi range. I have tried numerous different settings on my EBC (Profec B Spec II) and nothing seems to help hold it. I am BPU+FMIC. Any help would be much appreciated.
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Member |
Damn. I have the exact same problem Boost rises, then drops to 14-14.5 just like you describe. I have a Profec-B Spec 1. Additionally I cannot get my boost over 16psi. When I unplug the wastegate, and use the throttle to reg boost, I can boost as high as ya like. I think it is my Profec or the Wastegate. I wonder if anyone use the wastegate spring mod along with an EBC?
___________ -Goldfinger 93 MSB Supra TwinTurbo BPU+ 76 Porsche 911 RS <-for sale |
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quote: |
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Member |
Yup. I have it set up exactly as you describe, and my car behaves exactly like you describe in your first post. Except mine runs up to arouns 15-16, then settles back down to 14-14.5 psi, even with the high boost set to the max. I am thinking wastegate spring. I am going to try the external wastegate spring trick this weekend and see if this doesnt solve the problem.
Thanks for the input! I really appreciate it. ___________ -Goldfinger 93 MSB Supra TwinTurbo BPU+ 76 Porsche 911 RS <-for sale |
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Member |
WooHoo!!
Problem solved. Turns out it was the waste gate spring. I went to Schucks and bought a kit of universal throttle return springs. The kind with straight ends, not hook ends. You cut and bend your own ends for your application. I used the stiffest one out of the package, bent small loops at both ends, then hooked one end around the flat lever/arm of the waste gate (next to the pivot point of the actuator). Then I stretched the spring and hooked the other end to the unused, threaded hole on the extra boss on the waterpunp. Now, With my ProfecB all the way up I can boost to 20 psi. I set high to a solid 18psi (at about the 3 o'clock position) When I turn the ProfecB off, I boost to 11-12 psi and it holds to redline. I can highly recommend this little mod to anyone who is having the boost drop problem. If you want pics, let me know. -GF ___________ -Goldfinger 93 MSB Supra TwinTurbo BPU+ 76 Porsche 911 RS <-for sale |
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Member |
I would love to see pix if you've got them. Send them to tstauber3@comcast.net My first run at this didn't work how I wanted it to.
Thanks. |
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Here is pic/diagram I put together. The spring I used I got a Schucks Auto Supply. They sell a package of universal throttle return springs. They are short and medium lenght springs, with long straight ends and are designed to be bent to custom lengths. I used the stiffest in the package. See the diagram for a pic of what it should look like.
 ___________ -Goldfinger 93 MSB Supra TwinTurbo BPU+ 76 Porsche 911 RS <-for sale |
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Mid-level Member |
cool diagram
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How did you get your hand back there is my real question? I pulled the vsv bracket off, but I just can't fit back there and had serious trouble getting the spring on!
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Member |
The spring is long enough that I just fished it back there and grabbed on to the wastegate arm. I didn't have to remove anything. Tpok be 3 or 4 trys "fishing" until I got it. You can sort of see what your doing with a flashlight if you look down through the intake manifold pipes.
___________ -Goldfinger 93 MSB Supra TwinTurbo BPU+ 76 Porsche 911 RS <-for sale |
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Goldfinger,
Its good to hear you fixed your waste gate problem. Boosting2day |
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