Gene Culley

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Hello All,

I'm starting to get some parts together for my supercharger build. So I figured I'd start a thread and I can start posting pics of what I have purchased to help others.

Thanks, Gene.

xander40

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Alexander.w

keep us updated... im trying to do the same thing!

Gene Culley

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You're from the Philadelphia area? I live in Reading and work in Conshohocken. Perhaps we can exchange notes about what we need.

Ok you guys may or may not know that I'm a GM Parts Dealer.

Anyway, I ordered myself some new stuff like supercharger gasket, tb gasket, tb bolts, etc. In the list of parts it says we need it lists a LSJ MAP sensor and LSJ map sensor connector.

The LSJ map sensor part number changed to 12614973 from 9359409. The LSJ map sensor connector is part number 88988320. The map sensor connector is a 4 pin, 4 wire and the new map sensor is a 3 pin. I called GM technical parts assistance and they told me the original is a 3 pin, 3 wire, and gave me another connector part number to use?

Now I read that I may not need a map sensor at all. What to do here??

HunterKiller89

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there are two ways to do it. You can use the LSJ's 2.5bar MAP/iat2 sensor (which is either 4 or 5 wires, i cant recall), use the connector to wire that in place of the stock 1bar MAP sensor on the L61, or you can use the LSJ's 1bar MAP sensor (the one that sits on top of the supercharger) by getting a second one of those and using that in the Intake Manifold as well. Doing that allows you to use the stock connector, so no rewiring is necessary. Be sure to tell vince which sensor you use when he makes your tune, or things might go boom...literally.
the stock L61 MAP sensor is not reused in this project BTW

MP81

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Wait, I thought we could reuse the stock MAP sensor in the L61s?

HunterKiller89

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^^well, you CAN, but the sensor is smaller than the ports on the IM of the LSJ, so you'd need a custom method of holding it in place. Its far easier to just use one of the two LSJ MAP sensors

Jn2

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suscribed, I'm using the stock l61 map, going to make a custom bracket from aluminum rubber and quicksteel, I already plugged the top of the blower with a piece of rubber and a aluminum piece to hold the thick rubber down...anyway good luck with ur build I have a complete list of things I used I can pm u

HunterKiller89

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why not just use the SCIP MAP from the LSJ? It's bolt on...a lot less work

MP81

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Yeah, I have the sensor in the top of the blower, but I think I'll just buy another LSJ MAP.

Do I need to rewire the harness for that?

HunterKiller89

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whcih LSJ MAP? the sensor in the blower is also a MAP, the one in the blower is a 1bar MAP, and the one in the manifold is a 2.5bar MAP (this is on a stock LSJ, on a 2.2/2.4 they can both be 1bar sensors or one can be a 2.5bar sensor)

Gene Culley

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Ok, I'm a little confused here. I'm not sure my original question was answered and this may get a little more complex.

First, there is only 1 MAP sensor on an LSJ. The other is what appears to be a Barametric Pressure Sensor. (this is what I'm experiencing, not to say I am a know it all, lol).

I purchased a MAP sensor, which my GM Parts Catalog says is on top of the supercharger. The MAP sensor is a 3 PIN, but the MAP sensor connector I purchased is a 4 PIN.

The Barometer sensor does not tell me where it is located in the catalog, but when I called for the correct connector part number for the MAP sensor they told me that the connector for the Barometer sensor was it.

I will have to check the service manual later today when I have a chance (finishing up my landscaping today) but my LAP (don't forget I have the 2.2 LAP) has the MAP sensor in the intake manifold.

So you're saying I don't need the MAP sensor at all? I don't mind buying the stock one to fill in the hole, but are you saying that I actually need this other Barometric Pressure Sensor to put into the LSJ intake manifold or does no sensor go in the LSJ intake manifold?

HELP. I'm reall confused now.

EDIT:

Ok curiousity killed the cat, so I decided to look in the service manual quick. The Barometric Pressure Sensor is not it. I just looked in the catalog and found the Intake Air Pressure And Tempeature Sensor. (IAT) Is this the other MAP sensor you were referring to?

Please do PM.

HunterKiller89

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that sensor is the 2.5bar MAP sensor i was talking about. The other sensor is just a 1bar pressure sensor, not 2.5 like the MAP/IAT sensor

Gene Culley

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Thanks for the valuable information. Here is what I've found after I got off the computer.

I got into the service manual and the component locator and the real MAP sensor is the one in the intake manifold and the one in the supercharger is the supercharger inlet pressure sensor.

Now, here is what the problem is with the actual GM Parts catalog. In the GM Parts catalog I found the following:

(GM Catalog) MAP sensor = Supercharger inlet pressure sensor
(GM Catalog) Intake air pressure and temperature sensor = Real MAP sensor

So if I want to use the 2.5 bar MAP sensor then I must order the other one.

Question though. You guys say that you can use the L61 MAP sensor (and this is the same sensor as the LAP) as long as I modify it to stay in the intake manifold.

My question is though, will I still be able to read the air intake temps? In other words, other than staying in the hole what will the 2.5 bar MAP sensor do?

HunterKiller89

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no. there wont be a way to read IAT2 if you use any of the 1bar MAP/SCIP sensors. Keep in mind, the only way to display IAT2's is to wire the MAP/IAT sensor in to replace the stock MAP sensor, and wire it in to the MAF to see IAT2s

MP81

iTrader: (2)

Maybe I should look into resoldering my intake MAP that came in the LSJ manifold I bought back together - it had snapped...Or is the one on the top of the SC the same thing and I can just put the broken one in into the SC?

HunterKiller89

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theyre different sensors mang. didnt you read anything i typed? lol

MP81

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No.

Too many words.

Haha.

Damn, If it's fixable, I'll fix it. If not, I'll buy a new one.

HunterKiller89

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i aint gonna help you till you read. lol
i dont write this stuff just for the hell of it...especially when ive explained it several times.

Gene Culley

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Hmm... I think I need to read up on what is IAT and IAT2 and then perhaps I can answer my own question?

I'm honestly just basically trying to figure out if I should or need to do the 2.5 bar map sensor.

HunterKiller89

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with vince's tune, no..not really. the other pressure sensor is a plug and play one with your stock harness, where the 2.5bar map will require some custom wiring.

Gene Culley

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So your advice is not to do the 2.5 map sensor and do the other pressure sensor?

HunterKiller89

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thats the route I went, and its a lot easier. doing the 2.5bar methi is really only advantageous for the 2.4l guys since they have HP tuners and will usually be doing the tuning differently.

MP81

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So, I'm confused - what sensor do we need to buy, then?

Gene Culley

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Ok, when I looked at the other MAP sensor I didn't think the connector was the same as mine, so I'll have to take a look again. So you purchased the 1 bar MAP sensor and how did you hold it into the intake?