Hello there,

I’m new to rotaries and turbos.

I recently purchased my dream car, an RX-7 FD.

The car is mostly stock, with only basic bolt-on parts. The only modifications to the engine, as far as I know, are a Blitz exhaust and Apexi intakes.

Recently, I went on a drive. After doing a pull and coming to a stop at a set of lights, the car began to idle poorly. It sounded like a small bridge port, and my first turbo did not engage at all. However, the second turbo engaged, and the car drove fine once at speed.

My assumption is that a vacuum line may have popped off or that there is a similar issue, as the car has low vacuum at idle and shows no boost pressure until the second turbo engages.

Is this correct, or could it be something else?

 

Good luck lol

Pandoras box has opened and unless you have the time, tools and competence, it would be advised to hand it off to a shop. What you've described is the start of a very long troubleshooting process especially over the internet.

My suggestion is to NOT troubleshoot and just take everything apart and redo it. Youre more likely to find the actual problem and other latent problems this way.

 

Run codes and get a smoke test done, before pulling things apart.

The front turbo is "always on".. So if it is not adding to boost it may be plugged. *

This can happen when the elements of an after market air filter (i.e. Apexi intakes) fall apart and get sucked into your turbo.

(* are the plastic/rubber pipes either side of the intercooler collapsing when you rev the engine?)

For good measure replace your air filter elements regardless.

Is the transition gate between the two turbos stuck open? See if there is movement in its actuator.

If it is open the front turbo might have trouble building boost.