I am trying to learn all I can before I start my trip to rebuild, street port, replace radiator, intercooler, ECU, etc. In my search for information on the Hatachi Metals I have not found anything on a compressor map for The FD3s. Can anyone help me out?

In turn here is a little info, some well known and some maybe not:

Mfg: Hitachi Metals
Model: HT12 (I have seen one reference to HT18)?
Turbine: A/R(inch) for Primary & Secondary 0.8
Dia. of Entrance,Exit(mm) 51,45
No. of Blades 9
Compressor: A/R(inch) 0.8
Dia of Entrance, Exit(mm) 41.5
No. of Blades 10

The Twin Sequential Turbochargers shortens the time to reach maximum boost by 30% and increases maximum power output from 204 to 255 SAE hp which is a 25% increase.

Bob Hartman
Atlanta

 

I have looked for these as well but not found them.

Perhaps a phone call to someone like Bryan at BNR might yield info.

Dave

 

Who is Bryan & what is BRN? I am new to rotaries, but not two-strokes.
Thanks.

 

Bryan owns a company called BNR Supercars that specializes in turbo upgrades (mostly for RX-7s). Do a quick search and you'll find his info. He knows a great deal about the stock twins. But AFAIK, no one has ever come across a detailed compressor map of the stock HT-12s (not even Bryan).

Be sure to post it here if you ever find anything. Good luck with the search!

-Rob

 

Believe it or not, I found one in an RX-7 Magazine from Japan. I've been meaning to scan it in - it's actually the stock turbo's compressor map overlaid with the later 280hp '99 twins. Looks to be accurate enough to make some guesses from looking at it.

I'll try and get it scanned in tonight.

Dale

 

Dale, you would be my hero if you posted that! Although, I do wonder how accurate and reliable a map in a magazine is... I'd personally rather have the data straight from Hitachi, but since that probably ain't gonna happen, this is the next best thing!

-Rob

 

We are looking forward to you scanning the info at your convenience. Whatever you have will be great!

Bob Hartman

 

Hehe, you need to pop into the forum more often, I posted it a few days back .

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/compressor-map-gurus-ive-got-stock-twins-map-505850/

Dale