When I purchased my FD, I was anticipating having to sort out the stock turbos(and some other stuff). So, I jumped at the chance to pick up a set of "99 spec" turbos from a friend who's long gone single.

I was hoping someone with carnal knowledge of these turbos could point me to some clear indicators of exactly what iteration of the twins I have.

 

the easiest way i can tell are the compressor housings bolt on instead of using a large clip.

 

I've attached a few pictures of the turbos(N3A1). Whatever the case, I got a good deal on a good set of turbos. A little radial shaft play, but minimal cracking.

Also enjoy some pictures of a sick old school Datsun roadster I stumbled upon recently.

 

Those aren't 99 spec twins.

99 spec twins are stamped N3G1 and have a black lining inside where the CHRA's are. Those are just regular 92-95 turbo's.

-Geoff

 

Thanks for sharing the pics of the Datsun

I have some cheap 99s if someone wants a set. 550 shipped

Front compressor housing is polished and the shaft play is excellent but the manifold has large cracks which are still usable but the center web is cracked all the way through.

 

Thanks, Geoff. I figured as much. I'll use them regardless, no harm no foul.

Wish I had a better camera at that moment. It was super cherry! Recieved my hl covers, btw. Thanks again!

 

https://www.rx7club.com/3rd-generation-rx-7-1993-2002-parts-99/rz-twin-down-pipe-efini-y-pipe-apexi-intake-962720/
post 12 and 14 have pretty good pics of what to look for when identifying 99+ twins.
mainly, compressor housings are bolted instead of held in place with c-clips. you can see a black plastic "abradible" seals in the compressor housings, and its part name is n3a1. (most of the facts where previously stated, but I figured the pics would help)

 

Thanks, phrost. Post 12 really made it clear. I knew I wasn't searching well enough
https://www.rx7club.com/showpost.php...7&postcount=12

 

oh ya lol
n3a1 = 93-95 twin turbos
n3c1 = 96 to 98 twin turbos (only difference from a1's is higher nickel content in the exhaust housings)
n3g1 = 99+ twin turbos.
sorry for the typo in my original post.