2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S4 Apexi Power FC Harness Adapter

Old Feb 22, 2007 | 03:57 PM
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S4 Apexi Power FC Harness Adapter

We completed the first of the S4 adapters for mounting the FD Apexi Power FC today. We will be installing, testing and tuning in the next few days to establish a base map. We are going to try to keep the pricing the same as the S5 kit. We will let you know when it will be available for purchase.

Here is a pic.
Attached Thumbnails S4 Apexi Power FC Harness Adapter-s4_adapter.jpg  
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Old Feb 22, 2007 | 07:13 PM
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Will this work on Nonturbo S4 models as well ?
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Old Feb 22, 2007 | 07:54 PM
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Sweet!!!! and why would you want a power FC on an NA?
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Old Feb 22, 2007 | 08:26 PM
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Originally Posted by dregg100
Sweet!!!! and why would you want a power FC on an NA?
1. To make more reliable power to the wheels
2. Have more options for tuning than safc
3. To run n/a turbo if anyone wanted to
4. Cheaper price than Haltech, Microtech, etc
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Old Feb 22, 2007 | 09:02 PM
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^^^
Yeah what he said
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Old Feb 22, 2007 | 09:43 PM
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Thank you guys for doing a great service for the FC community. My order will be coming in the next month.
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Old Feb 23, 2007 | 05:25 AM
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Originally Posted by wtfdidusay82
Will this work on Nonturbo S4 models as well ?
Yes, I suppose it could. The map would have to be reconfigured for vacuum only, that would give you 400 fuel correction cells.

The other plus are that you get to loose the AFM, upgrade to any injectors you want, and unlike the S-afc have control over timing. You could also install a knock sensor.

I will take a close look at the N/A wiring diagrams, just to make sure, I know there are slight differences.
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Old Feb 23, 2007 | 08:18 AM
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I'm in.

But this could be a problem.

https://www.rx7club.com/showthread.p...apexi+bankrupt
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Old Feb 23, 2007 | 08:55 AM
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Everyone's getting WAY too worked up about the bankruptcy. Companies operate for YEARS under bankruptcy - it's simply a way to re-structure the company when the debt portfolio gets too great.

People have already spoken with people from Apexi and they have said there will be no change in operations.

Not to mention so many of Apexi's products are very good sellers. If they literally shut the door, some other enterprising company would buy the rights to produce the products.

Too many people have been Chicken Little over this issue - give it a rest.

Dale
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Old Feb 25, 2007 | 12:09 PM
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It will probably affect future product development of other stuff, but they are not just going to stop manufacturing the most-used aftermarket computer for the FD.
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Old Feb 25, 2007 | 03:45 PM
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are you going to offer FD intake air temp sensor, TPS, MAP sensor and ignitor as well?
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Old Feb 25, 2007 | 03:49 PM
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There is no need for the TPS, and as with the S5 we are supplying the adapter harnesses for the IAT and MAP sensors. I am working on a harness for the igniter. We are not going to sell any of the sensors or the Power FC. We do have all the part numbers and the best sources listed on the "how-to".
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Old Feb 25, 2007 | 09:45 PM
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Originally Posted by wtfdidusay82
4. Cheaper price than Haltech, Microtech, etc
You gotta be kidding me...

Are you assuming your (possibly) 20 year old wiring harness be good enough to handle?
How about you include the $1,000+ price tag for a brand new Mazda OEM engine harness with the costs?
Still think it's cheaper?
I doubt it...


-Ted
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Old Feb 25, 2007 | 10:39 PM
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yeah ur right ted, the harness is only good enough to work for the stock ecu the power FC has too much JDM HAWTNESS!!!!!!!!!!! seriously, if its good now y will throwing in a power FC change things???

and yeah.....now i have a delema......lol this or the MS......hmmmmmmmmm decisions decisions.....guess ill just whatch what apexi does......
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Old Feb 26, 2007 | 12:24 AM
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The Power FC obviously does not cure a fried harness, but if there is nothing wrong with it, then it certainly does not have to be replaced. What it does do is eliminate some of the 20 year old components that fail all the time, AFM, pressure sensor, variable resistor, etc. Plus, no more need for a FCD or S-afc and the ability to upgrade to any size injectors.
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Old Feb 26, 2007 | 12:25 AM
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Meh. Clean all your grounds etc, buy the Power FC, install it, and if it still runs like ****, get a new harness--provided that you don't somehow pop the motor or something. If it runs fine, well, you're golden like a shower.

I just like the ease of use and aftermarket support of the Power FC. I had no trouble figuring it out on my friend's FD.

Oh and the engine harness is like $800ish. I called Mazdatrix.
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Old Feb 26, 2007 | 12:29 AM
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IF mazdatrix wants $800 then Ray at Malloy would be even less.
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Old Feb 26, 2007 | 12:40 AM
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Please do a S4 NA set up for us.
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Old Feb 26, 2007 | 12:54 AM
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Will there be an issue with the S4 guys running low impedance injectors?
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Old Feb 26, 2007 | 04:46 AM
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We offer to solder in resistors for low imp injectors. On the 87-87.5 there is already a resistor pack.
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Old Feb 26, 2007 | 06:34 AM
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Whats the time frame on that ignitor harness?
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Old Feb 26, 2007 | 06:38 AM
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AS soon as Sumitomo responds with a quote and lead time for the ignitor connector I will have a much better idea. We will be contacting you and all the other people that have already purchased the S5 adapter kit, when it is available.
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Old Feb 26, 2007 | 09:25 AM
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Originally Posted by BlueTII
AS soon as Sumitomo responds with a quote and lead time for the ignitor connector I will have a much better idea. We will be contacting you and all the other people that have already purchased the S5 adapter kit, when it is available.
Would it eliminate the need for soldering, because if so.... I would love you forever.
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Old Feb 26, 2007 | 09:51 AM
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Yes, completely eliminate soldering and bring the install time down to about 1 hour.
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Old Feb 26, 2007 | 01:36 PM
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Originally Posted by BlueTII
Yes, completely eliminate soldering and bring the install time down to about 1 hour.
Oh I am so waiting for that
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