Go Back   Rotary Car Club > Tech Discussion > RX-7 2nd Gen Specific (1986-92)

RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections.

Reply
 
Thread Tools Display Modes
Old 02-23-2017, 10:44 AM   #16
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

Oops, forgot to attach pic. . Can the to wire be connected to this, do you know off the top of your head?

Attached Images
File Type: jpg IMG_20170223_091941226.jpg (98.1 KB, 54 views)






__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 11:01 AM   #17
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

Just checked the manual and the my OE plug would have been a small T shaped connector. Mine is not there. oh well, I'll have to figure something out.
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 11:19 AM   #18
TitaniumTT
Test Whore - Admin
 
TitaniumTT's Avatar
 
Join Date: Mar 2008
Location: Right Behind you son
iTrader: (4)
Posts: 4,582
Rep Power: 10
TitaniumTT will become famous soon enough
Default

That looks like the CAS wiring and if that's still there, you might be able to use those wires to power the ALT, with come retasking of course

S4's use the T-shaped connector, S5+ use the style that you're using.

What happened to the T connector?
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-
TitaniumTT is offline   Reply With Quote
Old 02-23-2017, 11:24 AM   #19
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

When I went carb, I removed the harness.
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 11:41 AM   #20
djmtsu
My minds tellin' me no...
 
djmtsu's Avatar
 
Join Date: Feb 2008
Location: Murfreesboro, TN
iTrader: (10)
Posts: 3,983
Rep Power: 13
djmtsu will become famous soon enough
Default

Quote:
Originally Posted by FC Zach View Post
When I went carb, I removed the harness.
Yes, however that plug is on the driver side POWER harness, not the ECU harness. The CAS is also on the power harness, which you clearly still have.

It's there somewhere....
__________________
1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
djmtsu is offline   Reply With Quote
Old 02-23-2017, 11:51 AM   #21
TitaniumTT
Test Whore - Admin
 
TitaniumTT's Avatar
 
Join Date: Mar 2008
Location: Right Behind you son
iTrader: (4)
Posts: 4,582
Rep Power: 10
TitaniumTT will become famous soon enough
Default

Ah. Ok, so heres what you need to do.....

Buy Scotch
Buy plane ticket
??????
Profit

Butt seriously, depending on how much of the harness you cut back or removes, and I think I know which harness you pulled out ... Giggitty ... you need to go back to the FE-03 connector, between the "Front" & "Engine" harness and find the B/W & W/B wires and run them up to the alternator and plug them in. That will do it.

If the FE-03 connector isn't around anymore, you can get them on the FEM-01 plug and route them up to the Alternator. That plug is or course located around the stock ECU.

Now, if you've already got a nice Ludwig Harness and you don't have the provisions in that harness for the Alternator, what you can do is use the vacant CAS wiring that you showed the pic of. Those will be in the Front Harness and routed over to where the ECU lives. From there it's a matter of jumping the wires from the FEW-01 plug to the CAS wires (R,W,L,G) and then making the connection to the Alt.

Any of those approaches will properly control the Alt and prevent battery drain. But the key is, regardless of what the internet says, or the GM crowd, the alt NEEDS both wires to work properly and not kill the battery either by slow discharging death, or 16V overcharging death
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-

Last edited by TitaniumTT; 02-23-2017 at 12:05 PM..
TitaniumTT is offline   Reply With Quote
Old 02-23-2017, 12:05 PM   #22
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

Where I'm at so far.



Going to connect the top to a switched 12v source but need a resistor?
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 12:06 PM   #23
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

Quote:
Originally Posted by djmtsu View Post
Yes, however that plug is on the driver side POWER harness, not the ECU harness. The CAS is also on the power harness, which you clearly still have.

It's there somewhere....
It's not there.
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 12:11 PM   #24
TitaniumTT
Test Whore - Admin
 
TitaniumTT's Avatar
 
Join Date: Mar 2008
Location: Right Behind you son
iTrader: (4)
Posts: 4,582
Rep Power: 10
TitaniumTT will become famous soon enough
Default

Do you have my number?
Are you off today doing this shit now?
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-
TitaniumTT is offline   Reply With Quote
Old 02-23-2017, 12:13 PM   #25
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

I'm a night shifter, been at this for a while now.
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 12:14 PM   #26
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

No number.
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 12:17 PM   #27
djmtsu
My minds tellin' me no...
 
djmtsu's Avatar
 
Join Date: Feb 2008
Location: Murfreesboro, TN
iTrader: (10)
Posts: 3,983
Rep Power: 13
djmtsu will become famous soon enough
Default

I have sweet Brian's number....
__________________
1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
djmtsu is offline   Reply With Quote
Old 02-23-2017, 12:18 PM   #28
FC Zach
RCC Loves Me Not You
 
FC Zach's Avatar
 
Join Date: Mar 2008
Location: Eagleville, TN
iTrader: (2)
Posts: 2,162
Rep Power: 12
FC Zach is on a distinguished road
Default

He's got you blocked and has a restraining order against you
__________________
1992 Toyota Celica Turbo AllTrac
1987 Mazda RX7 Sport
1979 Rotary Yamaha Golf Cart
1976 Hercules W2000
1975 Dolmar KMS4
FC Zach is offline   Reply With Quote
Old 02-23-2017, 12:18 PM   #29
TitaniumTT
Test Whore - Admin
 
TitaniumTT's Avatar
 
Join Date: Mar 2008
Location: Right Behind you son
iTrader: (4)
Posts: 4,582
Rep Power: 10
TitaniumTT will become famous soon enough
Default

^
DJ, you want haz play matchmaker?
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-
TitaniumTT is offline   Reply With Quote
Old 02-23-2017, 01:06 PM   #30
TitaniumTT
Test Whore - Admin
 
TitaniumTT's Avatar
 
Join Date: Mar 2008
Location: Right Behind you son
iTrader: (4)
Posts: 4,582
Rep Power: 10
TitaniumTT will become famous soon enough
Default

Hey Zac, remember what I said about the 7club being all fuuucocked? Well..... yeah... Check this out,,, ignore 7Dust, he was handed the answer 3 times I counted, he's a fucking stubborn idiot... I dunno what it does, so I'm gonna leave it unhooked. I don't care about idiot lights, so I;m going to leave it unhooked. There's the problem

Satch & RockLobster know what's up. It's exactly what I found out and now mine works just fine

http://www.rx7club.com/2nd-generatio...ratch-1048705/

Quote:
Originally Posted by RockLobster
I wired my race car (s5 alt) without any of the stock harness, getting the alternator to work properly was the biggest pain. Until I basically learned what all the wires do. You need all 3 wires connected. If you are not using the stock harness you need to create these circuits or the alternator will either not work or kill itself.

B terminal is the obvious part. That's the charge wire. It...um...charges the battery...min 4 gauge IMO.

S terminal needs direct battery signal, can't go through a relay or any switch. It can go through a fuse. This is the "sense" wire. It tells the internal alternator voltage regulator what the battery voltage is and thus how much "charge" to put into the system. The closer you connect this to the battery the better your alternator will work. If you just jumper it to the charge post it really wont fluctuate voltage output to adapt to battery state and load conditions.

And last but not least the one that had me thinking like you. The L terminal which is where the excite wire connects. Yes it does power the idiot light. It does this because current flows if there is a substantial difference between the system or batt voltage and the alternator charge voltage. This terminal/wire must be connected because it is in effect what "turns on" the alternator. BUT and this is a big but. YOU CANNOT JUST CONNECT IT TO A HOT WIRE OR THE BATTERY. It must have resistance or you will destroy the alternator voltage regulator and the alternator will need to be rebuilt because it will not regulate voltage, the voltage will just rise with RPM up to 16-17 volts. I don't have to tell you that is bad. SO, the factory dash has two parallel sources of internal resistance. One is a light, the other is a standard resistor. You CAN NOT skip the resistor because if you just use a light and the bulb burns out, guess what, your alternator shuts off. So, you have to wire this terminal back to +12v (again no relays upstream for this one too) but you must also put a roughly 120-150 ohm resistor on this wire. Up to you if you want a charge light in parallel. It appears in some cases (3rd gen rx-7 and other cars) the factory dashes just use multiple idiot lights as the redundant sources of resistance for this. So if one bulb burns out the alternator does not just quit working. If you do put a charge light in parallel you need to put a diode in also or the light will be on all the time. The diode should only allow current flow TO the alternator. It needs to BLOCK current flow back from the L terminal.

I think in your case your alternator may be damaged or isnt charging because it isnt turned on. But your assumption that the alternator "stays on" when the engine is not running is incorrect. This isn't actually possible. Without the little wheel spinning on the front of the alt it's basically a paper weight, it cant be on without being driven. But, if you damaged the voltage regulator it may create a bleed. If i recall correctly when i blew one trying different things to get it to work properly (read just put unresisted +12v to the excite terminal) it self excited after that and would not regulate voltage at all.

Some reading for you: http://bob_skelly.home.comcast.net/~...ternator1.html

This basically explains all this, probably more eloquently than i did.
The Bob Skelly link I BELIEVE is the one I was telling you about
__________________
-The Angry Stig-
DGRR 2009, 2011, 2012 & 2013 - Best FC

DEALS GAP!! WOOHOOOO!!!!!

2015 Audi S4 - Samantha - Zero Brap S4
2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter
2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins
1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle
1988 'Vert - In progress
1988 FC Coupe - Gretchen -The attention whore BEAST!


I'm a sick individual, what's wrong with you?
I'm pure Evil
I'm still insane, in the best possible way.
I think Brian's idea of romance is using lube.
Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion.
You win with your thread. Most everything
It's a truck with a steel gate on the back. Just a statement of fact

Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff....
No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon.
-Angry Motherf*cker Mode ENGAGED-
TitaniumTT is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:07 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Hosted by www.GotPlacement.com
Ad Management by RedTyger