Starting my 20v blacktop

saigon
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Starting my 20v blacktop

Postby saigon » Sat Jun 17, 2017 5:46 pm

Ok I got all the engine plugs in starter wired to push button need to know what wires to connect where to power ecu igniter and injectors

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GZE_RA21
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Re: Starting my 20v blacktop

Postby GZE_RA21 » Sat Jun 17, 2017 10:52 pm

I just got my 20v blacktop running too, a very exciting moment indeed.

Um to be honest, it's pretty straight forward. For the injectors it's 4 connectors in a row on the engine harness in the intake side, shouldn't be hard to find.

The ignitor is a black plug kina flat in shape with like 6 or 7 wires going to it. Just take your ignitor and try to find a connector that matches it.

Same thing with the ecu, should be at the end of your engine harness, it's 3 big plugs one is 26 pin one is a 12 pin and one is a 20 pin....or something close to those numbers....

If you were able to install a 20v in a car, i think you should be able to figure out a couple connectors. It's not hard
take your time, just a big game of 'what's not plugged in, and where does it go'.

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jondee86
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Re: Starting my 20v blacktop

Postby jondee86 » Sat Jun 17, 2017 11:58 pm

If all of the above has been taken care of, and you have put the BT engine into
an AE86, you need to look for this plug...

Image

Image

This large squar(ish) plug is located high on the firewall behind the engine, and
connects the dash harness to the engine harness. The black/orange wire from
pin #2 supplies 12V from the keyswitch for the injectors and ignition.

The ECU gets switched 12V (B and B1) from the EFI Main Relay in the underhood
fusebox, and a constant 12V (Batt) from the EFI fuse. If you haven't ripped the
dash harness out of the car, these three wires will be found in the AE86 14-pin
ECU plug.

Have fun :)

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

saigon
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Re: Starting my 20v blacktop

Postby saigon » Sun Jun 18, 2017 5:46 am

I'm confused about if I'm missing anything to fire it up I got the b1 b from ecu to 12v all grounds to earth from ecu what else needs 12v to get spark and fuel pump got it to 12v I'm doing it to a push button for now
Last edited by saigon on Sun Jun 18, 2017 10:36 am, edited 1 time in total.

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saigon
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Re: Starting my 20v blacktop

Postby saigon » Sun Jun 18, 2017 10:21 am

I guess I'm asking if u power up the B B1 from ecu does it give power to all my wiring like spark and injectors just want to make sure not to mess anything up thanks

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jondee86
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Re: Starting my 20v blacktop

Postby jondee86 » Sun Jun 18, 2017 1:42 pm

The ECU doesn't really supply 12V to anything. The B and B1 power up the ECU
and allow it to supply 5V to sensors like TPS and water temperature, and control relays.
The constant 12V on BATT keeps the ECU alive when the key is OFF, just like the
memory wire on your radio.

Anything that needs a decent amount of current like the injectors and ignition get 12V
from the keyswitch, which gets power from the battery without going near the ECU.
The ECU grounds the injectors to fire them, it does not give them power. The fuel
pump gets power from the battery via the Circuit Opening Relay which is controlled by
the ECU.

If you want to have a "start" pushbutton, the only thing it can do is supply power to
the starter solenoid; direct or via a relay. You still need to have the key switch to
turn ON to supply 12V to the injectors and ignition... if you have them wired up to
work like OEM.

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

saigon
Club4AG Regular
Posts: 25
Joined: Fri Feb 20, 2015 3:12 pm

Re: Starting my 20v blacktop

Postby saigon » Sun Jun 18, 2017 2:03 pm

Thank you johndee86 you answered my doubts I know how to do it now thanks i should have everything good

saigon
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Joined: Fri Feb 20, 2015 3:12 pm

Re: Starting my 20v blacktop

Postby saigon » Tue Jun 20, 2017 11:50 am

I think a have a few wires left to identify 3 brown wires .. 3 black with white line and dots white and 1 fat black with white line and insulated and small wire white wire in it .. those I don't know what they are thanks again

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