Tyler Wilson

iTrader: (6)

I'm putting an LS3 in my 1999 Pontiac Trans Am.
I'm down to just a couple details.
I didn't see a MAP sensor on my LS3 intake, what do I buy and where is it located?
Also, what MAF sensor would be good, the engine is a stroker 416 with WCCH heads and a big cam, ect ect.
Thanks

edit: not using MAF, only IAT (race only). Still working on MAP, pics below. Also questions about MAP sensor ext. harness (links to pics)

BODUKE

I think I am using a ls1 map sensor in my swap. I am installing a GM 85 mm mass airon my car.

Tyler Wilson

iTrader: (6)

Is the map sensor located in the same place on the LS3 intake as my old LS6 intake?

Thanks for the mass air info.

BODUKE

[QUOTE=Tyler Wilson;17250187]Is the map sensor located in the same place on the LS3 intake as my old LS6 intake?.

Thanks for the mass air info.[/QUOTE
Ima see my builder I will ask. What cam are you going with?

VTC_WS6

iTrader: (9)

No, LS3 MAP sensor is located near the front of the intake vs. the rear for LS1/2/6's.

Tyler Wilson

iTrader: (6)

Ok, thanks. I've got a map on the way.

USMC5811

iTrader: (2)

you will need an extension/adapter to make the MAP sensor fit to the wiring harness and reach to the front of the LS3 intake

STLSleeper

Lingenfelter makes an extension harness for it.

Good luck with the swap sounds like it should be a blast!

Tyler Wilson

iTrader: (6)

Thanks guys, I now have an extension harness.
Hope this LS3 meets expectations!

lemons12

iTrader: (71)

Use a piece of rubber fuel line to keep the sensor in the front.

I went sd tune with mine..

lemons12

iTrader: (71)

Have you got a throttle cable adapter?

Tyler Wilson

iTrader: (6)

I do, purchased it through SDPC. They said it will work perfectly wit my NW 92mm TB.
Thanks for the advice on the rubber fuel line.
I've read and printed all the LS1 to LS3 conversion threads and hope I have everything I need, but I am sure something will be missing.
Especially since it has been 4 1/2 months since we took the LS1 out!

Tyler Wilson

iTrader: (6)

I've printed threads, read 3 different build threads and I still am foggy on the Crank sensor. I have the one from my LS1, does it go in the same location as it was in the LS1 into the LS3?
I have purchased a cam sensor extension harness, so I imagine the cam sensor is up front and I just plug into that and can toss my LS1 cam sensor?
Sorry I am sure this is old hat to you guys, but this swap is taking forever and I forgot more than I have learned.

lemons12

iTrader: (71)

i used an lq9 block with an ls3 top end so i cant help woth that..

the_merv

iTrader: (88)

Crank Sensor depends on if it's 24X or 58X. The Cam Sensor is a Gray sensor, different from the LS1. As long as you have the little harness on the cover the Cam Sensor wiring in the harness will plug directly in without swapping wires around.

Do you have the correct Valley Cover? Have you accounted for the Knock Sensors?

Tyler Wilson

iTrader: (6)

It's 24x, I started with a bare block from SDPC and built it from there.
So maybe it is in the same place as the LS1 crank sensor? See this pic below, image #22:

http://www.amosauto.com/Articles/Gm/...gen-camaro-z28

I do have the harness on the front cover, I will plug into that, thanks.
I do have the correct valley cover, I purchased that along with the LS3 intake together.
Knock sensors, yes, the block is drilled and tapped and I have the harness to put them on both sides of the block.
Thanks

the_merv

iTrader: (88)

Normal LS1 Crank Sensor will work, Black one.

Tyler Wilson

iTrader: (6)

Perfect. Thanks

TransWS6Am

iTrader: (41)

hope your using a ls1 map sensor, a ls3 sensor will not work with the ls1 computer.

Tyler Wilson

iTrader: (6)

Yes, I am. Do I need to do this to back of my LS3 intake:

http://www.gmhightechperformance.com.../photo_15.html

Run a hose up to the front of my intake like this:

http://www.gmhightechperformance.com.../photo_33.html

Or, just put the map in the same place as the picture above shows and plug it in?

One more thing, my MAP sensor extension is this one:

http://www.racetronix.biz/itemdesc.a...2-MSEH&eq=&Tp=

I now notice it says it's for LS2 applications - will it still work with what I'm doing here?

Thanks