The plug 'n play MS for S4 2nd gen rx7's is done and works. I started up my 86 S4 GXL on it today, and it ran great!

Here are some pics of the unit itself:








I'll post vids of running and tuning as soon as I get the stock wiring harness's grounds fixed and get the stock harness's coolant temperature sensor connector fixed (I had some grounds rigged up and jiggled the harness until the coolant sensor worked... but this isn't because of anything wrong with the MS, this is the fault of the factory harness in the car).

 

I saw it! It's fantastic!

 

wow.. thats nice.. i really want to see a vid.. im wanna try my ms on the vert.. but im affraid i might not want to remove it . haha..

 

That looks great.Do you have to shield the ignition VR sensor leads,or is it not important on a short run? Are these 2 leads twisted together for a reason? cheers

 

inside the car, and for such a short run, the shielding doesn't matter so much.

The ones that are twisted together are just not wired to anything yet... they are the fuel-pump relay wire (which isn't used on an S4 if you leave the AFM in.... if you take it out you can use that wire to trip a relay to turn on the fuel pump) and the O2 sensor wire, which I haven't hooked to anything yet b/c I'm going to be tuning the GXL to get base-maps using a wideband.

 

Pricepoint? Availability? If and when? Thanks. Keep up the great work!

 

Price: depends on how hard it is to get the ECU plugs. Most likely between $400 and $500

Availability: depends on how hard it is to get the ECU plugs, other than that, as soon as pele, tofuball, and I can build up a stock...

I also want to put together some good base maps so people can fire their cars right up as soon as they plug in.

Depending on time and money (it's a bit expensive to buy a lot of kits at once), I should be able to have several within the next month... and also depending on time, I should be able to have a wideband-tuned base map.

 

Nice work Muy. I have 2, S4 ecu's N326 style that work but as we all know are not worth much. Id be happy to trade them both for a in dash cd player used is fine. Thanks for the great work and let me know if your interested in the ECU's.

 

haha, I'd rather give you money, I don't have an in-dash CD player that I can give you.

 

I have a N326 paperweight sitting here. Want it? I think everyone who has benifited from your work and shared info owes you one. haha

 

I'll take it.

 

i found that the 80's toyota ecu uses a very similar connector. two of rx7 harness connectors will plug in. i built a adapter harness pretty similar. i wish i made the harness somewhat longer so i could get megasquirt off the floor. it rains alot here and my car leaks.

 

I am planning on doing the same but for a S5 TII.The S5 uses a two-stage voltage output for the fuel pump,what would be the best way to tackle that? cheers

 

Ken,

That looks great! I'm sure there'll be a good market for these. Have you found a source for the harness connectors yet? Finding and scrapping old ecu's seems like a hassle for production quantities.

Griffin,

Here's one option: Power the pump with a series resistor like stock (S4's?). Use an auxilliary output to close a set of relay contacts that bypass the resistor. When the auxilliary output is on, you have full pump voltage. When off, you have low voltage.

 

Either replace the stock FPR with one that can handle the full fuel pump flow or wire up a MS output to activate the fuel pump relay resistor. Just make sure that if the circuit fails, the fuel pump will run at full voltage.

 

Yea man send me a few bux for USPS and ill send you a GSLSE ECU if you like.
aaron
email

 

I have a stock second gen convertable in dash CD player I will send you for the two ECUs.

 

we have tofuball's set up to run full voltage all the time... and it seems to work fine.

 

Not yet, pele is working on getting AMP to custom make us some if possible. Until then we're using scrapped ECUs.

Ken

 

Tofu,
Thats nice but I need a aftermarket cd player for a DIN sized opening with RCA outputs. CD players are cheap now. If you and Muy want these ECU's thier the N326 style 2 of them just let me know 30.00 each . I paid more than that but dont think thier worth more especially for your purpose. I also have a GSL-SE ECU but think they use different AMP plugs. If you want me to remove the plugs to save on shipping thats not a problem. I am in NY so shipping to MD would be fast and reasonable. You can email me directly if wanted at Azenis29@aol.com thanks for the input.

 

Nah.

Thanks though

 

So when is the S5 version coming out?

I fairly intrested in picking up a plug'n'play for my S5. I need to talk to my father because he is the electrical guru when it comes to stuff like this. If he isn't intrested in building one with me then I will definitely be in the market for one.

I also have a S4 ECU you guys can have if you pay shipping. If that will help you guys out any (Especially if that will make the S5 version come out faster ). PM me if intrested.

 

I'll do something about an S5 version as soon as I get 2 things:

1) an S5 rx7 to test on
2) a spare, busted S5 ECU to steal the connector from. I had one somewhere, but I can't seem to find it now.

I or tofuball will PM you about the S4 ecu.

 

Ken I've got an S4 and an S5 ecu you can have.

 

Sounds good. I would gladly let you guys play with my S5 if we lived closer. I'm planning on picking up a DD soon and would gladly let you guys play with my car as long as it takes but, I live in Oklahoma.

Someone with an S5 in MD.... STEP UP! Help these fine people out!

On the subject about the ECUs I will go raid the local junkyards and look for some too. You can of course have those for free or for around free depending on what I have to pay for them. Prolly not too much. Heck, maybe even for free if I get a good discount when the S5 version comes out.