Good bye LT-1....Helloooooo LS-1!

[nascarnate326]

Curious why you think this? I've never once had a problem with my LT1 e-brake, and LT1 e-brakes don't get in the way of LCA relocation brackets either.

The LS rear brakes don't have that goofy secondary caliper attachment. Yours may be perfect but if it ever gets out of adjustment its a SOB to get correct. You also can't get many of the parts for the e brake part of cable/spring/bracket. The LS version also looks way better too, don't have that giant rubber thing.

OP if you have the parts, swap them you won't regret it. Even if it costs you a couple hundred bucks to get a brake motive kit from eBay, you will love them. My car stops soooo much better than my 94 or my 96 its not even funny. The only thing better would be a CTS V/5th gen setup or a Willwood/ $$$$$ setup. Ive got a bunch of LT1 front brake parts if anyone wants them. Rotors with 3k miles on them..all free.

[zeeman]

U could just do cai off the side and down to get air from the bottom

yes, Its an option, I may even do it until I figure out how to do the slp.

[zeeman]

I apreciate it Nate, but Im going to kill the Lt brakes first. Then Ill do the Ls brakes.

So, I got formys LT back together and ready for re insertion, that'll be tomorrow or Tuesday. It should be complete by the weekend. Then I will start the transformation. That damn car hates me, I swear. Nothing ever works like it is supposed to....

I still dont have an effin clue about the wiring. Im thinking its 3 sections engine, dash, and body. Im planning on transplanting the engine and dash wiring. So many unknowns......

[JoeliusZ28]

my car stops great with all original LT hardware. Using good pads and rotors makes a hell of a difference. But IMO the real benefit to LS1 brakes is dual piston front calipers, thats huge.

[meissen]

There's an engine wiring harness and then a dedicated engine bay wiring harness. The engine bay wiring harness goes from the passenger shock tower down to the headlights, up to the fuse block on the driverside and back up to the driver's side firewall behind the master cylinder. It then plugs into the body harness inside the car under the dash. The body harness goes through the dash, doors, all the way back to the taillights.

[gasman]

The only wiring harness u need to change is the engine harness

[landstuhltaylor]

Stock LT rear brakes are less likely to cause wheel hop than LS rear brakes if that matters

[meissen]

The only wiring harness u need to change is the engine harness

Yes and no. He has the entire other car. He could just change the engine harness and then have to compare wiring diagrams to figure out what wires changed between 1994 and whatever year his engine harness is from, or he can just swap the entire wiring harnesses. The plugs on the engine harness will not have the correct wires in the correct pins to match what's on the 1994 engine bay harness nor the three plugs in the passenger side kick panel..

For example, 1994 only has C100 on the passenger shock tower. 1995+ have C100 and C105. 1998 has C100, C101, and C105.

[zeeman]

Ok. I dont.understand what c 100 is. Is it.a.single.wire?

What I have seen so far, there is the pcm and its wiring under the hood. Where is the interface for the under dsh cluster etc? I guess I will find out when I start gutting the donor.
If I take just the engine compartment and dash wiring how do I complete the integration with the 94wiring?

[hoogiesngrinderz]

C100 is a connector. Multiple wires.

I'll have to look into my stash of pinouts to find exactly what needs to be done for your setup.

[zeeman]

Thanks, any help is appreciated!

So I wrapped up Formys bird today, gotta swap out the stat in the a.m. but other than that its done. Mother of god that car hates me,it put up a fight, but I win. Runs good. It runs a bit hot for my taste, Ihma put a 160 stat in it.
That means mine is next! I have the week after theholiday off, So I am hopping to get the bulk of the work done then.

[meissen]

Ok. I dont.understand what c 100 is. Is it.a.single.wire?

What I have seen so far, there is the pcm and its wiring under the hood. Where is the interface for the under dsh cluster etc? I guess I will find out when I start gutting the donor.
If I take just the engine compartment and dash wiring how do I complete the integration with the 94wiring?

C100 is a 10-wire plug.

Here's the wiring in 1994.
Capture.PNG

In 1998 (and I'm hoping 98-2002)
A - Pink - Power feed from injector fuse 9
B - Green/White - A/C Compressor Relay Control
C - Dark Green - A/C Compressor clutch solenoid feed
D - Gray - Reference voltage feed - 5 volt reference
E - Dark Blue - Throttle position sensor signal
F - Empty
G - Pink - Power feed from ignition fuse
H - Dark Blue - Coolant Fan Relay Control
J - Dark Green - Coolant Fan Relay Control
K - Black - "Sensor return" (no clue what sensor?)


Comparing the two you might need to change cavity D since I'm not sure what the reference voltage is for. E is definitely different so you'll have to figure that one out. F doesn't exist on the 98+ side so you'll have a wire running to F on the 1994 engine-bay harness that doesn't go to anything. Cavity G you might be OK - they're both power feeds from ignition fuses. K you'll need to figure out - on the 1994 engine-bay harness it's a power feed but on the 1998+ engine harness it's some sort of sensor return wire.


C101 and C105 doesn't exist on your 1994 "engine-bay" harness. The engine-bay harness is the harness that runs from the passenger shock tower down to the headlights, across the support between the radiator and the bumper, to the fuse block on the driver's side, then up to the firewall beneath the master cylinder, through a bulkhead and then plugs into the dash/interior harness).

[meissen]

Again since there's no C101 or C105 in 1994 these are all wires that the engine harness will have that you'll need to find sources for on the 1994 wiring.

C101 in 1998 (and hopefully 98+)
A - Yellow / Black - Vehicle anti-theft system starter enable relay output-coil
B - Pink - Fuse output-ignition 1-type III fuse
C - Brown - Air pump relay control
D - Green/white - Fuel pump relay control
E - Pink - Fuse output - ignition 1 - type III fuse
F - Empty
G - Orange - Fuse out-put - battery - type III fuse
H - Black/White - Ground
J - Empty
K - Gray/Black - Ignition Retard Signal


C105 in 1998 (and hopefully 98+)
A - Purple/White - Traction Control System Indicator Lamp Output-Failure
B - Pink - Fuse Output Ignition 1 - Type III Fuse
C - Brown/White - Traction Control System Switch Signal
D - Dark Green - Cruise Control signal - disengage (V6 VIN K only) so in your case this is unneeded
E - Tan - Serial Data Signal (OBD2 wire)
F - White - Cruise Control indicator Lamp Output (V6 VIN K Only) again unneeded
G - White - Tachometer signal (you'll want that )
H - Purple - Air Injection Reaction Solenoid Relay output-coil

[landstuhltaylor]

I wouldn't trust any wiring to be the same among 98-02 years unless you can verify it. There have been too many people stripping harnesses based off a different year diagram only to find out they cut something they needed to start the car.

[formula218]

http://m.ls1tech.com/forums/showthread.php?t=1018887

This might help, I bookmarked it to show to my buddy when he does mine.