I have problems with my secondary boost now. It's 10-8-14+. This just now happened and it happened very quickly. I checked it again and now the pattern is 10-8-0-5. When the secondary tries to come in theres a muffled sound almost like blowing through a popped balloon. Mods are efini y-pipe, full exhaust, upgraded twins set for sequential setup, streetport, apexi power fc, upgraded underdrive pulleys, odyssey battery, and removed airpump. I looked at http://www.autosportracetech.com/RX-...AirBypassValve and I'm a little confused with the symptoms. Thanks in advance for help and any suggestions.

 

so now the boost is 10-8-0 or 10-8-5
and you saying it sounds like blowing through a popped ballon,,,,, maybe your correct check for rubber vacume hoses that may have come off.
Id check both the pipes to the turbo control actuator make sure they aint split or have come off

 

Actually now its just doing 10-8-0. Its still making the popped balloon sound when the secondary turbo is trying to come in. Anymore helped would be greatly appreciated.

 

Ok....I figured out the 10-8-0 pattern problem. It was a disconnected vacuum line on the rats nest....lol. Now I have the boos t spiking issue with a pattern of 10-8-15+....any suggestions on what this could be....I'm still looking at the this website http://www.autosportracetech.com/RX-...AirBypassValve for help, but any other suggestions would be greatly appreciated. This problem just surfaced around a few days ago...since I'm an attentive and responsible rx7 owner I know I won't blow my engine by overboosting....because I won't drive hard until the problem is fixed. Thanks once again in advance.

 

Ok...I've been reading different posts about boost controll and power fc function. I've just changed my base duty on the actuators for the turbos using the power fc so I'm hoping this will control the secondary boost spike. Is this possible? Anymore suggestions?

 

When you had the upgraded twins done...did you port the wastegate??

 

No, I did not have the wastegates ported.

 

You are seeing "boost creep", in which the wastegate is not ridding of the exhaust gasses, as it has exceeded its physical limit. You need to either port the wastegate or get an exhaust restriction of some sort.

 

^^Yessir! Take those turbos off and port the wastegate!

 

Hmm....would this secondary boost spiking just now occur even though I've had the turbos on for more than a year? If not porting the wastegate is the cause to the spiking...wouldn't the spiking occur on the primary boost also with a pattern like 15+-8-15+ where primary boost and the secondary boost are spiking? I'm asking these questions because it seems odd how primary boost is under perfect control while the secondary is the only one that spikes and it just started recently. Would a manual boost controller fix this spiking issue permanently?

 

Boost issues are back. I've spent all day looking and checking the vacuum lines and I thought I found the problem, but I still have the same problem 10-8-0 with the rubber balloon sound coming in when the secondary is supposed to come on. I switched the ACV and CRV and now the sound makes a whooshing when the secondary is supposed to come on as if all the boost is being diverted out of the valve intead of through the engine. Any suggestions or help would be greatly appreciated.

 

Did you test your Charge Relief solenoid to make sure its functioning properly?

 

No, I haven't. What would be the easiest way to check it?

 

http://rx7.voodoobox.net/howto/solen...oid_check.html

Or, switch that solenoid with another one (like one for the emissions) and see if it fixes the problem.

 

This was the problem...there was a broken nipple and a hose popped off another turbo control solenoid. Thanks for all the imput guys. I'm working on my spiking problem in secondary....it think its an easy fix though.