John M

I apologize in advance for posing a question which I’m sure has been answered numerous times for a 3rd generation RX-7. Perhaps someone can direct me to a previous answer or another site with the possible solutions. I have owned the car, a 1994, for five years with no previous concerns or abnormal operations observed. I drive the car about 1500 miles a year (spring-summer).

Boost increases rapidly to 6-7 psi as engine speed rises from about 2500 rpm. The boost then decreases to about 3 psi as engine speed approaches 6-7000 rpm. There is never a sound of air leakage during this acceleration; however, as the throttle is lifted at the end of the test, there is a definite abnormal sound of what appears to be rushing air. This data is from trials in 3rd gear.

I have looked at and felt all the hoses I can see and find no splits and none seem loose.

From what I have read, it seems the primary boost has not reached a value to sufficiently operate the control air system. Before I begin a disassembly of hoses, solenoids and whatever else, I’d like to reduce the number of possible suspect component(s) if possible.

Thank you in advance. John

RXtacy

iTrader: (7)

I would first check to see that your bov is working properly. You can check it with a mitty vac following the service manual. Also check in the turbo actuator nipples to ensure that the restrictor pills are in place. Follow the trouble shooting guide here and you should be able to find the problem.
http://www.autosportracetech.com/RX-7/rx7stuff.htm

4CN A1R

iTrader: (6)

^
like rxtracy said..

i would actually first take off the intake box and check the turbo actuator and pre-spool hoses for cracks or splits if you havnt already. pop them off and inpect all the sides. the pills should be in them, but just to be sure everything is a-ok, blow through them to see if there is restricton and no pin hole leaks.

and if they are silicone and not the stock hoses...be sure to put them back the same way they came off.

cheers

RXtacy

iTrader: (7)

I believe that the 94 and up had the pills moved into the acutator nipples themselves, but it doesnt hurt to check the hoses. If they are in the hoses i would replace them anyway. Mine looked fine, but over the years the hoses had stretched around the nipples and where letting to much air by. Good luck.

John M

Thank you both for the prompt and detailed explanations. I will investigate further as soon as possible, using your guidance. The appoaching arctic winter of northern Illinois may hamper my progress however.

I am a bit envious of so many smart folks on these forums with so many modified cars.

Thanks again. John

pietrino

iTrader: (1)

OK sorry for introducing me, buti have the same problem and one big questions.
What Are Esactly these restrictor pills?? I know whate are and where is located but may be that removing my boost controller i replaced these restrictor pills with other better performing.
Now to restore the original configuration, i need to know these restrictor Pills are just a rubber hose ore they have some restrictor inside? wich is the esactly size of these?
Thanks
Pietro

RXtacy

iTrader: (7)

Yes when you install a boost controller you may have removed the restrictor pills. They are located in either the vacuum hoses for the pre-control and wastegate actuators as seen below or in the nipples for those vacuum lines.

The pill sizes are roughly
Stock Wastegate Pill is about .062"
Stock Turbo Pre-Control is about .058"
The smaller you go the more boost you will see. All of this info is on autosportracetech.com in the future please investiagate the links we provide.

pietrino

iTrader: (1)

ok thanks i saw already that site, my problem was to understand those word " restrictor Pills".
Now i found a Pics and i understand evrything.
Probably was my fault to intrpretate a tecnical language wich is not mine (i'm from Italy)
Anyway thanks now i understand and i will solve quick the problema after one year of troubleshooting.