Tech Questions
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From: sacramento
Tech Questions
Hi Everyone! I'm new here and I am a big fan of the Rx7. I've been recently talking to a private owner of a 93 Rx7 FD. I'm am very new at this technical stuff and willing to learn but here are the questions!
Rebuilt turbos from BNR 99RZ modified to run twin turbo (non-sequential), what does non-sequential mean for this?
PFS ecu and commander needs tuning, are they expensive?
The latch mount for the hood popped, how would I replace this?
and last question!
What is the Vacuum line work and Rats nest to run sequential turbo?
I would really much appreciate the answers or any type of help. The car looks in good shape and it runs. Here is a youtube video of it , http://youtu.be/-l3LKaUJHVY
Seller is asking for $9,999
Thank you everyone!
Rebuilt turbos from BNR 99RZ modified to run twin turbo (non-sequential), what does non-sequential mean for this?
PFS ecu and commander needs tuning, are they expensive?
The latch mount for the hood popped, how would I replace this?
and last question!
What is the Vacuum line work and Rats nest to run sequential turbo?
I would really much appreciate the answers or any type of help. The car looks in good shape and it runs. Here is a youtube video of it , http://youtu.be/-l3LKaUJHVY
Seller is asking for $9,999
Thank you everyone!
https://www.rx7club.com/3rd-generati...l-links-68640/
You might want to start by scrolling down to 'B' for "Buying"...a lot of good info and things are explained better and more completely than anyone would likely be able to do in this thread.
As for tuning the PFC...depending on who does it, how involved and if a dyno is used, a professional tuning session is usually somewhere between $350 and $500 I think.
You might want to start by scrolling down to 'B' for "Buying"...a lot of good info and things are explained better and more completely than anyone would likely be able to do in this thread.
As for tuning the PFC...depending on who does it, how involved and if a dyno is used, a professional tuning session is usually somewhere between $350 and $500 I think.
+1 for the FAQ, it is an excellent resource that should be bookmarked for easy reference. I'll try to answer your questions as best I can, despite typing with a broken finger 
Non-Sequential: From the factory, every FD operates its twin turbos sequentially. Means that all the exhaust is funnelled into the front turbo to get it spooled fast, then around 3500rpm (I think, check the FAQ to be certain), the rear rotor feeds the rear turbo to get it online. Non-sequential means the owner made it so the car stays in this mode, one rotor feeding each turbo. Typically, this involves removing the flapper doors in the turbos' turbine inlet and exhaust manifold, but one can also fix the doors open for the same effect. More into is in the FAQ.
99-Spec: Mazda did some upgrades on the FD for 1999, focused primarily on the turbos. These include the Y-pipe, reworked compressor housings and some other goodies, all of which are backward compatible with earlier FDs. The only exception is the 96+ ECUs as they are 16-bit instead of 8-bit like the 93-95 version.
Vacuum lines: Depending on how they did the Non-sequential mod (look for signs of welding on turbos & exhaust manifold), going back to sequential my require replacing the manifold and turbos' hotside housing with non-modified ones. The rest is a matter of running the vacuum lines to their respective targets as shown in the Vacuum Diagram. Let me stress that you'll NEED to use thick wall SILICONE vacuum hose here. The turbos themselves have SIX solenoids in total, so it can be pretty confusing at first. But with a little patience, you'll get through it just fine.
Non-Sequential: From the factory, every FD operates its twin turbos sequentially. Means that all the exhaust is funnelled into the front turbo to get it spooled fast, then around 3500rpm (I think, check the FAQ to be certain), the rear rotor feeds the rear turbo to get it online. Non-sequential means the owner made it so the car stays in this mode, one rotor feeding each turbo. Typically, this involves removing the flapper doors in the turbos' turbine inlet and exhaust manifold, but one can also fix the doors open for the same effect. More into is in the FAQ.
99-Spec: Mazda did some upgrades on the FD for 1999, focused primarily on the turbos. These include the Y-pipe, reworked compressor housings and some other goodies, all of which are backward compatible with earlier FDs. The only exception is the 96+ ECUs as they are 16-bit instead of 8-bit like the 93-95 version.
Vacuum lines: Depending on how they did the Non-sequential mod (look for signs of welding on turbos & exhaust manifold), going back to sequential my require replacing the manifold and turbos' hotside housing with non-modified ones. The rest is a matter of running the vacuum lines to their respective targets as shown in the Vacuum Diagram. Let me stress that you'll NEED to use thick wall SILICONE vacuum hose here. The turbos themselves have SIX solenoids in total, so it can be pretty confusing at first. But with a little patience, you'll get through it just fine.
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