85 iroc swap with 92 350 tpi

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Apr 6, 2022 | 12:14 AM

85NightRider

Thread Starter

Junior Member

Joined: Apr 2022

Posts: 15

Likes: 3

From: Flawda

Car: 1985 IROC

Engine: 5.7

Transmission: 700r4

Axle/Gears: 3.45 BW 9 Bolt

85 iroc swap with 92 350 tpi

Hey yall,
Putting a 350 tpi from a 92 z28 into my 85 iroc (originally 305 tpi/700r4). Can I use the engine bay/interior harness from an 87 tpi to run both the 92 engine and a 87 ecm in my car? I will be converting the SD to MAF.

Last edited by 85NightRider; Apr 8, 2022 at 08:43 PM.

Apr 6, 2022 | 01:55 AM

3rdgenzroc

Member

Joined: Feb 2014

Posts: 250

Likes: 33

From: IL

Car: 86 Iroc-Z

Engine: 383 HSR

Transmission: 700R4

Axle/Gears: 3.42

Re: 85 iroc swap with 92 350 tpi

Quote:

Originally Posted by 85NightRider

Hey yall,
Putting a 350 tpi from a 92 z28 into my 85 iroc (originally 305 tpi/700r4). From what ive read in the swap sticky, it's a bit different for the 85 year. For anyone who knows the swap for the 85, what exactly is needed? I know I'll need to use a 86+ ecm/harness, is that it?

You might want to read up first on the differences of Speed density (SD) and MAF to decide on which way you want to go, and it will dictate which ECM/chip you will need to use, along with the set up for your intake you will have. Also the differences on the accessory style you need for your engine (V-belt VS serpentine), which will also affect what harness you will want. There is many differences between the years on all of these.