Spanky7829

93 Rx7 touring
Apexi intake
Hks bov

In second gear I can feel the secondary turbo kick in and I can hit 80mph before redline. But if I just cruise and shift into 3rd and I push to redline my secondary turbo just fizzles out. Same thing for 4th gear. My first fd when the second turbo kicked in I could feel the push immediately. I hope this makes sense to someone. It's the best I can explain it.

tt7hvn

iTrader: (5)

You need a boost gauge to measure for accuracy and tell us exactly what's happening in a given gear and RPM. It'll help us diagnose.

The turbos do not operate differently for a given gear, each gear they operate the same; except for first, the load of the car is completely different given the drive ratio. for 2nd through 5th though, it's all the same operation.

Spanky7829

Thanks for the response back. I'm gonna try to get my gauge installed this weekend so I can provide more info. Just been slacking on doing it because I didn't know if I wanted to do another fd again.

dgeesaman

iTrader: (7)

Yes to the boost gauge.

But the symptoms you're describing reflect a possible leak on your vacuum side of the solenoid system. So once you've got the boost gauge running well, you can use a tee fitting to install it on one of the lines leading to/from the vacuum tank. Then do a couple of runs and confirm whether the vacuum tank runs out of vacuum or not. A slow boosting run applies pressure to the manifold and given enough time, will use up the stored vacuum and prevent the solenoids from switching on the secondary boost.

David

Spanky7829

Thank you David!