ls1 swap computer location

[1987ls1truck]

Anyone with any advice on where to mount the computer on a 87 with a 99 ls1 is it possible to mount it in the glovebox or in the general vicinity?? Any tips or suggestion would be a big help

[chebyshortbox65]

Not much room under dash my 81 I mounted on the left fender inline with the fender lip been like that for over a year no problems
Posted via Mobile Device

[Mikec10]

firewall? under the glove box, behind the radio? on the inner fender?

[Firebirdjones]

I mounted mine behind the glove box on my 72 (with AC even) much less room in there compared to a square body.

I prefer in the cabin somewhere though. Lots of options with a little imagination.

[1987ls1truck]

i dont seem to have a whole lot of harness to reach to under the dash !! and the connectors are pretty big !! Thanks for the help to all !!

[Firebirdjones]

Originally Posted by 1987ls1truck

i dont seem to have a whole lot of harness to reach to under the dash !! and the connectors are pretty big !! Thanks for the help to all !!

I use Howell for the harness's on my retro swaps. I tell them where I want the computer and they make the harness specifically for the application with enough length to do the job. That's one advantage to having a custom harness done.

Sounds as though you are trying to use an OEM harness from a different vehicle? Your computer mount choices may be limited.

[1987ls1truck]

I got mine done at fuel injection specialties. The enigine was out of a 99 camaro and on them they are mounted on the right side close to the firewall under the hood. I dont want a rats nest of wires under the hood trying to hide as much of the harness as possible for a clean look.

[chebyshortbox65]

There made to be mounted under hood factory I just would not put them where they get soaked
Posted via Mobile Device

[1987ls1truck]

after lookin at it i gotta take the platic wrap off it and get the computer connections serperated from the loom of wires and seperate them from other wires that are taped together they are plenty long enough to go under the dash they just need seperated from other wire going to differnt connections/connectors. Shouldnt be a problem just a whole lot of tape to undo lol !!

[Firebirdjones]

Originally Posted by 1987ls1truck

I got mine done at fuel injection specialties. The enigine was out of a 99 camaro and on them they are mounted on the right side close to the firewall under the hood. I dont want a rats nest of wires under the hood trying to hide as much of the harness as possible for a clean look.

I know what you mean (2 4th gens here) I don't like the computer out there either with all the wires exposed like they are.

Did Fuel Injection Specialties make a new harness as per 4th gen specs and not take into consideration the retro swap you are doing?

When I've done these Howell harness', they wanted to know specifically what vehicle I was sticking them in, and where I wanted the computer, and even where I wanted to drill the hole in the firewall to pass the harness through. I suppose they've done so many of these swaps in various vehicles they know what length to make the wires and/or distance from computer to sensors depending on location I provide them for computer mounting....

I did a couple of jeeps and most recently my 72 blazer, 2 completely different animals but the harness came out perfect every time.

Sounds like you'll get it squared away though with a little fiddling.

[Gordonr1973]

Ontop of the heater box is an option depending on how you run your wires.

[1987ls1truck]

yea fuel injection specialties asked me what it was going in but said nothing about the wire length. They gave me a checklist to fill out of what i was running and not running on the truck! As for asking me about 4th gen they did not they put what they call a "custom tune" in it took the vats out did away with the stock rev limiter and all that jazz. Sorry if i sound dumb on all this its kinda unventured waters !!

[Firebirdjones]

Originally Posted by 1987ls1truck

yea fuel injection specialties asked me what it was going in but said nothing about the wire length. They gave me a checklist to fill out of what i was running and not running on the truck! As for asking me about 4th gen they did not they put what they call a "custom tune" in it took the vats out did away with the stock rev limiter and all that jazz. Sorry if i sound dumb on all this its kinda unventured waters !!

Sounds about right. You'll get it figured out

[Rich84]

I'm not sure how big the ls computer is.. But I put my tpi computer above the glove box where my 84's computer was mounted. There was plenty of room under there for all the relays and fuses that came with the harness I bought from FIC.
Posted via Mobile Device