So in 1st 2nd and 3rd gear my PSI at a rolling 3k RPM sits at a vacuum of -10 PSI, when I actually lay on the throttle it maybe goes up to about 7 PSI, I do have a boost controller and I'm running stock sequential turbos, and I should be (ideally) getting the typical 10-8-10. I'm not- could it just be a problem with the gauge? Vacuum line leak? Also what is the easiest way to find where my exhaust rattle is coming from (a certain welding point or otherwise) without lifting the car completely off the ground?

And sorry if these seem like dumb questions I'm fairly new to the rotary world!

 

have you tried adjusting the boost controller or checking that it is installed correctly?

There are a few threads and pics in threads in the 3rd Gen FAQ thread thread stickied here and in the 3rd gen forum that you can use as reference to verify installation issues.

You can also post some pics of the install so we can help you verify.

 

Not sure I completely understand what you mean by "rolling 3k rpm", but the engine must be under some load to make boost.

If it hasn't been replaced with a bolt-on version, the coupler from the 'y' pipe to cross-over frequently leaks. This is the coupler at the "top" of the turbos and exposed to all the heat. Examine it closely for splitting and make sure the clamps are tight. Replace it with a good quality silicone coupler if it's still the stock 'rubber' version.

 

@gracer7-rx7 what I mean by a rolling 3k RPM; 3k RPM is usually where I'm at when I'm driving down the highway at 75 mph. I did check the imfamous Y coupling and it appears that it is in decent working condition (no cracks, readjusted the clamps and tightened them). As for the boost controller I can't say- there are two ways the previous owner had his boost controller installed (not sure if this is normal as this is my first RX-7) one boost toggle was an off/on switch like a valet mode button (which was also a valet mode toggle but it also sent a signal to the ECU to stop spooling the turbo he said- or something like that) and the other was a ****... Far left position was set for 10-8-10, middle was 12-10-12 and the far right he said was supposed to push 16-14-16... I've tried all the different settings- valet mode on and off for each boost setting and I'm still getting about 7-5-7 with an idle/rolling 3k RPM of -10 PSI