bdford

Thinking about doing a swap to GM's LS3 (LS 376/480) crate complete w/ their hot cam for a total of 480/475 out of the box. Has anyone done an LS3 swap yet? Will it work w/ the stock PCM. I know the reluctor wheel is different, but what else?
What am I getting into?

69LT1Bird

iTrader: (1)

Someone else can chime in too, but I don't think you will be able to use your harness or PCM. Sensor locations are different, sensors are different, the reluctor ring like you said.

Since you have an M6 and don't need the computer they also offer a harness/PCM kit for that crate engine.

19201327 NEW
LS376/480 Controller Kit
• Includes all the components required to run your GM Performance
Parts crate engine (see chart below for detailed list)
• For individual engine controller, use P/N 19201790

19201861 NEW
LS3 Controller Kit
• Includes all the components required to run your GM Performance
Parts crate engine (see chart below for detailed list)
• For individual engine controller, use P/N 19201859
The kits above (P/N 19166567, 19166568, 19201327, 19201861)
include the following items:
19166573 Engine Harness
12576410 Mass Air Flow Meter
19166574 Mass Air Flow Meter Mounting Boss
10367117 Accelerator Pedal Assembly
12581966 Oxygen Sensor (Qty 2 Per Kit)
15156588 Oxygen Sensor Mounting Boss (Qty 2 Per Kit)
19171935 Instruction Sheet

The controller will not function in a production vehicle
unless all kit components are used. These controllers
will not operate any of the production gauges. Aftermarket
gauges are required.

71CamaroLS1

You can use your existing PCM and harness, you just have to swap the reluctor wheel and cam gear, and get extension/adapter harnesses for cam sensor, knock sensors, injectors, etc.

See this thread:

https://ls1tech.com/forums/showthrea...t=gear+cam+ls3

for lots of detail.

BTW, some of the crate engine vendors - Scoggin Dickey, for instance - will do the reluctor wheel swap (and probably the cam gear swap) for you before shipping the motor. I'd also suggest that, although the Hot Cam is fine, there are almost certainly better choices in the aftermarket - check out the C6 tech/performance board on corvetteforum.com.

duff70

i was able to use my pcm. my reluctor was the same 58x(2007 trailblazer ss).

chi3f

iTrader: (3)

I'm doing a motor swap and was seriously considering the ls3 hot cam crate motor. I'm questioning the ability to use the crate harness/computer setup to run stock style gauges. This isn't going into a gm vehicle, but i know i can connect a computer from an ls1 and make all the gauges work. Why do you need aftermarket gauges for this setup?

Yes i've read quite a few threads on the ls3 crate motor and have seen you need aftermarket gauges. I have yet to see the reason though.

Thanks

JayplaySS

iTrader: (15)

Seems like a of work when you could just go 402+ with an LS1 block and be better off. My .02

Thats what Im doing. Im not going through the hassle of an LS3 swap with better choices out there.

chi3f

iTrader: (3)

In the thread starters case that is probably a good idea and probably that is where your post is directed. I thought i made a new thread, instead i brought this one back from the dead.

If i can get the ls3 computer to play nicely with my stock gauges i don't see how i could go wrong with an almost turn key motor. Knowing that i have no GM parts to start with.

fast99

i just got done with mine, if i had to do it again i would go 402, alot of extra money and parts for not much more power

89Formulaws6

iTrader: (52)

a cam'd ls3 will put down close numbers ive been looking, change out the reluctor wheel

u gotta lengthen a few wires big deal nothing too hard

89Formulaws6

iTrader: (52)

a cam'd ls3 will put down close numbers ive been looking, change out the reluctor wheel

u gotta lengthen a few wires big deal nothing too hard

mohd1

I can re-Programming by HP Tuners this is parts 19201790 & 19201859 & 19166570 & 19166569 Engine Controler

http://www.sdpc2000.com/product/1920...sLS376480.aspx

http://paceperformance.com/index.asp...Category=12524

JayplaySS

iTrader: (15)

In that case, I agree BUT I would get a real LS3 cam and skip the GM hot cam. They have much better cams available for the LS3 now

Wrencher32

I just finished a LS1 to LS376/480 conversion in a 2002 Camaro SS. If you want a bolt in, all your gages and transmission control, it's relatively easy. I got my injector harness adapters, 90mm cable throttle body, knock sensor harness adapters, and the 24 to 58 conversion trigger module from Lingenfelter Performance. I had to fabricate a throttle cable bracket, but I think that Scoggin-Dickey has that if you don't want to fabricate. You will have to use your knock sensors from the LS1 engine, and just screw them into each side of the block, build an extension harness for the crank sensor that will reach the other side of the engine, over the throttle body, also extend your factory crank sensor harness to the same point, and the cam sensor harness connector too. Don't use the LS3 MAP sensor, just T your LS1 MAP sensor into the vacuum port in the back of the intake. After I finished, sent it over to G Force in Houston to have it tuned, and dyno. Dyno results were 430hp at the wheels at 6000 rpm. If you want or need a more detailed answer, email me.

gerowl

put a ls3 in a 2004 silverado -the ls3 throttle body wont work --bought a adapter from truck to it but still wont work --this is drive by wire also truck just backfires I dont know what to do ?????????/

wildbird02

Was this 430HP at the wheels with an A4 or M6?

AVB

iTrader: (9)

I'm running into the same situation with the LS3 throttle body (PN 12605109). I've read they have issues and if running an LS3 the one to get is the earlier one w/ PN 12570790. BTW.. a different harness for the later LS3 TB doesn't exist so I'm assuming it's not that simple. LS2 throttle bodies seem to work just fine.

samckitt

iTrader: (5)

Bringing back an old thread here. I have a Trailblazer LS2 with LS3 heads and Camaro LS3 intake. I need a throttle body & was going to go with the 2009+ LS3 one (heard it has quicker response, is pretty much ported from the factory), and like the LS3 MAF sensor (cleaner install) but i guess the LS2 controller won't work with eitherr. So was debating going with a GM LS3 controller kit. Anyone know of any reason why this won't work, or is a bad idea? The motor is a 58x setup.

82cetuner

iTrader: (9)

if its a 58x tooth a ls3 computer will work just fine, i thought a trailblazer was 24tooth but if yours is 58 then a ls3 computer and throttle body will work just fine, but i dont see why the ls3 throttle body wouldnt work on your setup as is with the ls2, as long as you are drive by wire you should be fine

Chris10an

iTrader: (1)

The Trail Blazer are 24..

samckitt

iTrader: (5)

Then I have an oddball one, it is 58.