91 rally sport

iTrader: (2)

hey guys. I was looking on here about my question. I was wondering if I have the 91 sd harness if I still need to play with the bulk head connectors? also not to sound dumb but what and where is said connector?

thanks

85Iroc-Z

iTrader: (4)

I am currently swapping a 90 speed density harness into my 85 car. There are a few changes that have to be made to c100 connector pin outs. The c100 connector is the large electrical connector that bolts to the firewall down by the brake booster.

91 rally sport

iTrader: (2)

ok. so what are the changes that have to be made

Dyno Don

iTrader: (7)

A '91 into a '91...no changes, it's plug and play.

91 rally sport

iTrader: (2)

well. I saved an 85 irocz from the junk yard. so I was going to convert it to sd instead of maf

91 rally sport

iTrader: (2)

I just need to know what pins to move in the bulkhead. I already have the 91 harness.

85Iroc-Z

iTrader: (4)

I don't have pictures handy at the moment. Just search for a picture of the 85 c100 connector and the 91 c100 connector. Then just compare them to each other to see where the differences are at.

91 rally sport

iTrader: (2)

So I just swap pins on the c100 to match the 85s?

85Iroc-Z

iTrader: (4)

Yes if the car is an 85, it would be easier to change the pins on the 91 harness to match those for the 85.

Dyno Don

iTrader: (7)

There are a lot of pins in that '91 harness that would have nothing to connect to on the other side of the '85 bulkhead connector.
They changed the way the system gets power to the devices.
You would have to add a lot of connections to the inside of the bulkhead on the '85 car to feed the components under the hood and devices under the hood that feed things inside the car.
That would be a huge task.
Hope your up to it.

91 rally sport

iTrader: (2)

Making me nervous about it now... by the way system gets power like which components would that pertain to?

TTOP350

iTrader: (8)

Pssssssst, look for a 85 maf harness. It will save you time, money and a buch of frustration.

91 rally sport

iTrader: (2)

yea ive been told the 85 computer isn't the best the though

TTOP350

iTrader: (8)

Its not the best of the 3 but it would be easier to use a maf harness.
What are your plans for the car?

91 rally sport

iTrader: (2)

It just going to be something for me to havr fun with

85Iroc-Z

iTrader: (4)

You can still use the 86-89 maf harness and ecm. Not the greatest, but an improvement from the 85 ecm.

Jonesyfxr

iTrader: (2)

Talk to Tuned Performance, he'll get you headed in the right direction.

91 rally sport

iTrader: (2)

Would an ebl computer work in an 85?

TTOP350

iTrader: (8)

This would be the way to go.

Dyno Don

iTrader: (7)

I agree ^^

RBob

iTrader: (1)

Yes, an EBL Flash ECM with the Port Mod will run your '85 TPI set up. Although it requires a MAP sensor be added and some re-pinning of the ECM harness connectors. Email me for more information on this swap.

It sounds like you want to update from the '85 ECM to a '90 - '92 ECM? Mike did this in two steps, first to the '86 - '89 '7165 ECM, then from it to the '90 - '92 ECM. His web site:

http://www.eecis.udel.edu/~davis/z28/ecm_swap/
http://www.eecis.udel.edu/~davis/z28/ecm_swap_730/

He used the original harness doing this. Which is the easiest way to go.

RBob.

91 rally sport

iTrader: (2)

The one ebl computer does both of those?

RBob

iTrader: (1)

For an '85 through '89 TPI car, the EBL Flash with the Port Mod is the easiest to swap in. There are fewer pin changes for the '86 - '89 ECMs then the '85 ECM. But it works with both.

For the '90 - '92 TPI set ups the EBL P4 Flash ECM is plug & play. The EBL P4 can be used for the '85 - '89 TPI cars, but it is a lot of re-pinning to get there.

RBob.

91 rally sport

iTrader: (2)

Which one would u recommend?

RBob

iTrader: (1)

For an '85 through '89 TPI set up we recommend the EBL Flash system with the Port Mod.

RBob.