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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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08-09-2011, 09:39 PM
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#1 |
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Sigh.....
Join Date: Feb 2008
Location: Murfreesboro, TN
Posts: 2,377
Rep Power: 20  |
FCD question
Are S4 and S5 FCDs interchangeable?
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present." |
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08-10-2011, 01:18 PM
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#2 | |
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Rotary & Boost Addict
Join Date: Feb 2008
Location: Dallas, Ga
Posts: 203
Rep Power: 18 |
Quote:
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 '05 Copper 6s, '87 TII RX7...248whp & 224wtq @ 12lbs |
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08-11-2011, 09:54 PM
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rotors excite me
Join Date: Mar 2008
Location: Iowa
Posts: 372
Rep Power: 18 |
seconded. you might find a store that sells one for each and see if they're the same or not (part number, or send support a question....). Racing Beat might sell them.
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He isn't a killer. He just wins -- thoroughly.   '87 TII 240+ rwhp on my DIY streetport, ~13psi on stock turbo, Racing Beat REVTII exhaust  rTek 2.1 awaits a tune Quote:
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08-12-2011, 07:59 AM
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#4 |
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Sigh.....
Join Date: Feb 2008
Location: Murfreesboro, TN
Posts: 2,377
Rep Power: 20 |
Racing Beat lists them differently but HKS (albeit eBay) lists them together. I found an S4 one to use so I'll be fine, but maybe good to know for future reference.
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present." |
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08-12-2011, 09:36 AM
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RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 |
Most of them are interchangable unless explicitly stated.
(This info is probably outdated, since I haven't messed with FCD's in years.) The older Racing Beat ones (metal case) could be used on any model? The only one that I know that doesn't work is the Trust / GReddy one - this unit is specifically listed as a Kouki FC turbo only application. Trust me, I tried - I slapped one on my old set-up on my 1987 Turbo II, and it didn't prevent the overboost fuel-cut with the stock ECU. :P -Ted
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reted_2000@yahoo.com Technical Advisor FC3S Pro http://fc3spro.com/ Quote:
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08-12-2011, 12:16 PM
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Sigh.....
Join Date: Feb 2008
Location: Murfreesboro, TN
Posts: 2,377
Rep Power: 20 |
Quote:
That's really weird considering how they work. I would think that if one worked, they all would. Perhaps the voltage is slightly different, e.g. 3.6 S4 and 3.7 S5 and the Greddy one activates at 3.65v or something. 
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present." |
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08-12-2011, 12:51 PM
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#7 | |
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RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 |
It's probably due to the design of the FCD itself...
The older Racing Beat units were just resistors inline of the signal. This basically shifted the overboost fuel-cut point to a higher boost level. I think I was able to hit it *with* the older Racing Beat FCD at around 18 - 19psi. Most of the new ones are voltage-clamp design, which just keeps the signal at a predetermined maximum *if* the input voltage exceeds that level. Since the overboost fuel-cut boost level is different between the FC turbo series, this is why you see specific applications explicitly stated. -Ted
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reted_2000@yahoo.com Technical Advisor FC3S Pro http://fc3spro.com/ Quote:
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