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Username Post: TBI to MP wiring        (Topic#168816)
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-02-07 03:51 PM - Post#1245002    

is there a wiring diagram anywhere to do this..i basically have a holly 950 TBI but am looking to go multi port. the multi port has the wiring harness coming from the 8 injectors then a couple feet of wire then loosk to be cut. is it possible to merge these 2 harnesses? im trying to save some money if i can by not having to purchase (and wait) for the wire harness from holley.



 




Doug_F 
Holley Subject Matter Expert
Posts: 4720
Doug_F
Loc: Bowling Green, KY
Reg: 08-20-01
09-02-07 05:31 PM - Post#1245061    
    In response to 66GOAT

Not exactly sure what you mean. It isn't a big deal to wire though. You have to have power to each injector. For the MPFI, you just split one injector ground trigger wire to two port injectors. On the TBI each ground trigger individually goes to each injector since there are 4 instead of 8.

Doug
1972 Nova
6.0L LSx, 80mm BorgWarner, 4L80E
9.34@147


 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-02-07 09:32 PM - Post#1245184    
    In response to Doug_F

ok, maybe this will help. here is the auction i won. i currently have a TBI. Im wanting to graft the wiring harness that is int he auction to my existing wiring. (the injectors are high impedance so if i did my homework right i do not need an auxillary driver??)

http://cgi.ebay.com/ebaymotors/Pontiac-V8 -EFI-Inta...

thanks, Vic



 
Danny Cabral 
Member
Posts: 3447
Danny Cabral
Loc: Connecticut
Reg: 11-03-04
09-03-07 03:37 AM - Post#1245230    
    In response to 66GOAT

  • 66GOAT Said:
The multi port has the wiring harness coming from the 8 injectors then a couple feet of wire then looks to be cut. Is it possible to merge these 2 harnesses?


If the wire harness connector plug is not cut, then you'll simply unplug the short TBI harness and plug the MPI harness into the main C950 harness.

If the wire harness connector is cut, then you'll simply use GM 'weather pack pins' to reconnect the plug to the wires (like Doug_F said). Wiring diagrams are in the back of the C950 manual. So it will look like this:

http://www.holley.com/534-129.asp


May God's Grace Bless You

'78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, A/C, Lentech Strip Terminator AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, 4" lift, 35" tires


 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-10-07 05:19 PM - Post#1250858    
    In response to Doug_F

when i splice the neg trigger wire from the 950 TBI wiring harness to 2 of the multiport injectors does it matter if they are on the same side or should splice it and send one to the drivers side bank and one to the passenger side bank?

just to clarify, red wire from the 950 TBI injector harness splices off and powers ALL 8 multi port injectors.



 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-10-07 05:21 PM - Post#1250860    
    In response to 66GOAT

another quick question....there arae 2 wires coming from each injector...both wires are white...does it matter which side is positive?



 
Doug_F 
Holley Subject Matter Expert
Posts: 4720
Doug_F
Loc: Bowling Green, KY
Reg: 08-20-01
09-10-07 05:25 PM - Post#1250862    
    In response to 66GOAT

No, doesn't matter, just make sure one going to it is a ground trigger and the other 12v.

Doug
1972 Nova
6.0L LSx, 80mm BorgWarner, 4L80E
9.34@147


 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-10-07 06:13 PM - Post#1250901    
    In response to Doug_F

thank you Doug. What about the neg trigger wires...does it matter which 2 injectors or side the splice goes to?



 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-11-07 04:39 PM - Post#1251646    
    In response to 66GOAT

BUMP...anyone? so when you run a multi port (1 PW per Rev) does it just fire ALL 8 injectors the same time once per rev??..or is it kind of staggered?? or what.

Help



Edited by 66GOAT on 09-11-07 04:40 PM. Reason for edit: No reason given.

 
DeltaT 
Frequent Contributor
Posts: 1023
DeltaT
Loc: San Jose area, CA, USA
Reg: 06-20-02
09-11-07 04:51 PM - Post#1251659    
    In response to 66GOAT

I think bank to bank just fires 1-3-5-7 one revolution then 2-4-6-8 360 degrees later. Doug can confirm.

Jim



 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-11-07 08:55 PM - Post#1251834    
    In response to DeltaT

so how do i know what color injector wire (ie white/red, white/orange etc) goes to my 1 and 3 cylinder...and which one goes to my 5 and 7 etc...



 
Twilightoptics 
Senior Member
Posts: 760
Twilightoptics
Loc: Vancouver, WA
Reg: 06-26-04
09-11-07 09:10 PM - Post#1251836    
    In response to 66GOAT

I don't think that matters.

Atleast when I installed my injector harness I don't remember orienting it to one side or the other.

I could totally be wrong though.

'87 IROC-Z 355 HSR C950 Lunati Voodoo Solid 241/249@.050 .555/.576 lift(1.6) 110LSA, Pro Topline Iron 200cc/64cc, T56
'04 Jeep Wrangler "Rocky Mountain" 4.0L/5spd
'82 RX-7 GSL


 
DeltaT 
Frequent Contributor
Posts: 1023
DeltaT
Loc: San Jose area, CA, USA
Reg: 06-20-02
09-11-07 09:13 PM - Post#1251839    
    In response to Twilightoptics

IIRC, it seems like it should be important but it's not.

Jim



 
Danny Cabral 
Member
Posts: 3447
Danny Cabral
Loc: Connecticut
Reg: 11-03-04
09-12-07 01:17 AM - Post#1251878    
    In response to DeltaT

  • Commander 950 Pro manual Said:
- Sequential Fuel Injection System. In this fuel management system each injector is controlled separately. The timing of the metering event, referenced both to the crankshaft/camshaft position and the pulse width can be optimized for each individual cylinder.

- Batch or Group Fuel Injection System. The injectors are divided into two or more groups that are activated separately. Each group meters fuel once per each cycle of a 4 stroke engine. Each group or pair of group is offset by one crankshaft revolution. This arrangement allows for an injector timing selection that eliminates metering the fuel into an open intake valve. Holley uses this type of system.


The fuel injectors are supplied a constant 12V (on the red wire from the 'fuel pump/O2 heater/injectors relay') and the ECU pulses the ground (on the white/green, white/brown, white/red, white/blue wires).

I would look at the wiring diagrams in the back of the C950 manual. That should explain everything.

May God's Grace Bless You

'78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, A/C, Lentech Strip Terminator AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, 4" lift, 35" tires


 
D.Mac 
Senior Member
Posts: 1006

Loc: Ontario Canada
Reg: 03-22-03
09-12-07 03:10 AM - Post#1251890    
    In response to Danny Cabral

If you look at the picture of the harness above, you can see the way that they have them paired.
Grey, blue, orange and white are the trigger wires. So side by side injectors are paired.
Not critical, as long as 2 injectors are on each of the 4 triggers, and key on 12v on the red.

Dave MacDonald
Ontario, Canada

'66 Impala LT1/C950-,EFI,700R4,(sold 07/2011)
'12 Sonic LTZ, Turbo, M6
'07 Pontiac Solstice GXP
'06 Caddy CTS-V


 
Danny Cabral 
Member
Posts: 3447
Danny Cabral
Loc: Connecticut
Reg: 11-03-04
09-12-07 03:55 AM - Post#1251912    
    In response to Danny Cabral

  • Danny Cabral Said:
The fuel injectors are supplied a constant 12V (on the red wire from the 'fuel pump/O2 heater/injectors relay') and the ECU pulses the ground (on the white/green, white/brown, white/red, white/blue wires).

I would look at the wiring diagrams in the back of the C950 manual. That should explain everything.


Oh, I just realized that my post above only pertains to the ECU side of the injector harness; not the injector side of the harness (the colors change). Sorry for the confusion.

D.Mac is correct. Look at the injector harness picture I posted above; it illustrates the wire configuration.


May God's Grace Bless You

'78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, A/C, Lentech Strip Terminator AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, 4" lift, 35" tires


 
Doug_F 
Holley Subject Matter Expert
Posts: 4720
Doug_F
Loc: Bowling Green, KY
Reg: 08-20-01
09-12-07 05:59 AM - Post#1251981    
    In response to Danny Cabral

Injector Drivers A and C fire together and B and D as shown on the wiring diagrams.

It is "bank to bank" but can be wired to fire a pair on each side which is better than all on one side regarding pressure drop to the injectors.

Doug
1972 Nova
6.0L LSx, 80mm BorgWarner, 4L80E
9.34@147


 
66GOAT 
Contributor
Posts: 153
66GOAT
Reg: 06-24-07
09-12-07 10:18 AM - Post#1252130    
    In response to Doug_F

perfect, thanks guys.

i think i ll wire so

Injector driver
A to #1 and #3
C to #6 and #8
B to #2 and #4
D to #5 and #7



 




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