I have a 1993 Rx 7...I had it for quite awhile and never had any problems with it. Just recently I noticed that when I drive the car normally, meaning not getting on it the turbos work just fine...however if it get on it hard and tach 2nd gear hard then to 3rd, I get no boost. If let off of it then its fine or swithc to a higher gear. It only happens when I get on the car hard...Also I've noticed a rattle underneath the car that I never had before either..Plese Help......

 

Do you have a boost gauge? I can't imagine getting no boost after that, but i can see low boost. I'm having a similar problem so maybe we can diagnose together.

 

Yep, if you can do the boost test:

http://www.scuderiaciriani.com/rx7/boost_test.html

that will help in providing information as to where to start looking for your problem.

If you don't have a boost gauge, now is a prime time to get one.

 

I do have a boost gauge...The vacum at idle is in the vacum mark 20 psi....when i get boost it go to 10 or 11 psi...when i'm slowly getting on it....however spoke to a lot of shops and everyone is so sure its vacum line problem..They said since my lines are all original i probably have a leak somewhere....the someone told me it was my wastegate, then someone tod me it was a turbo actuator lever or something like that.....i hope this helps....