Right now I have 42lb injectors, 2.7'' pulley, and a maft, i was wondering if I just buy a 2.9'' pulley and a gm stage 3 pcm, will it all work or do I have to have stage 2 flash before I can have stage 3?

bump

 

Ditch the MAF-T. You don't have to do the Stage 2 first. Get the stage 3 and then a good tune from a good shop for your additional mods.

 

Ditch the 42s, get 60s, ditch the maf-t, forget the stage 3 pcm, and just get a hp tune.

 

you need everything that stage 2 has to install stage 3. (injectors, pcm, belt) But you can replace the st2 pcm with the st3 pcm if you don't want to have a/c and if you want to void your warrenty.

 

So i can just pop the stage 3 pcm in there, does chevy have to install it?

 

Nope.. Plug N Play

And as far as I know I don't think the GM Stage 3 PCM is tunable with HP Tuners

 

What do I have to do after i install it, don't i have to do a case relearn and take it to the dealership to get the crank sensor positioning fixed, like intense pcms?

 

bump, does anybody know?

 

Whats the point of getting Stage 3 PCM if you plan on getting a different tune??? why not just tune the stocker with HP tuners?

 

Yes you have to do a case learn when you get the stage 3 pcm you can't just "plug and play" with it and you can't tune the stage 3 pcm either GM locked it. If you want a more aggressive tune than keep your original PCM and get someone with hptuners to tune it for you.

 

What about the crank sensor?

 

That's what the case learn is for.

 

there is not a "case relearn" for this unles you call unplugging the battery while installing the ECU a "case relearn"

 

Oh, ok! Thanks

 

There is a case learn when you unplug your PCM and put in a different one. But I guess the instructions from GM could be wrong

 

^^^I agree

 

"But I guess the instructions from GM could be wrong"

The instructions from GM does NOT say this and if it doe splae point this out to me her eis a link
http://www.crateenginedepot.com/pdfs/s3ins.pdf

 

sorry i thought I saw it in the instructions but I asked a GM tech and they are wondering how you are going to get passed the pass lock without the case learn and how is your new pcm going to know the crankshaft position. If you could tell me how to get passed all of that it would be great because I can pass the info onto the tech I spoke with i'm sure he would like to know.

 

There is not a pass lock for it . Just unplug the battery ,unplugg the electrical leading from the old ECU and plug in the new ECU plug in the battery cable and your done. Unless I'm missing something. That 's why GM sells the kit so that you can easly do this at the track and plug back in the old one when your done.

 

I don't agree because of the pass lock and crank sensor but whatever (I can PM you what I have been told by a GM tech and by another shop) , I still think the best bet is to keep your old pcm and use hptuners, you will spend a bit more for the tune depending on if you know someone or not but the tune you do with hptuners will be way better than the gm stage 3.

 

My only problem is that I don't have anybody close to where I live to tune it? What bcobaltss is saying does make a little sense, I thought I read somewhere that you could switch pcms back and forth.

 

Can't hurt to try right. I am only going off of the info that I have been givin so I could be wrong, It wouldn't be the first time that a GM tech has lied to me about stage kits. What I would do is install all the parts and see if it runs and what it runs like, If it doesn't start than you have an issue but if it does and it runs good then you are golden.

 

There is absolutely NO CASE relearn on the Stage 3 PCM. There are a couple people on here who switch their PCM's back and forth. When you buy the Stage 3 PCM there is no VIN loaded into it. When you use a PCM that was installed into someone else's car and you want to use it in your then you need a CASE relearn because the crank position is probably different between the 2 cars. I have an Intnese Stage 5 PCM that they had to reprogram my VIN into it and I had to get a CASE relearn but seeing these Stage 3 PCM's are "off-road" use according to the instruction sheet it tells you to switch back to your Stage 2 PCM for "on-road" use. The nice thing about the Stage 3 PCM is the rev-limit adjustment, High Octane Mode and it has the ability to run up to a 50 Shot of Nitrous

 

There now everything is cleared up, Like I said in my post above yours "It wouldn't be the first time a tech has lied to me about stage kits", so it's nice to see that someone proved a tech wrong. I'll let the tech that I was talking to know that he was wrong so that he can't relay shitty info to someone else.

 

I am a Chevy Technician and I know for a fact that every PCM, new or used, MUST have a crankshaft learn performed on it. It is wierd though becuase sometimes it will run without it and sometimes it won't. But if it does run, there will most def. be a CEL on.
On the other hand i'm not sure on the stage 3 PCM because i've never had to install one. But if it is anything like a regular PCM then I can only asume that its needs a relearn. But don't let my thoughts hinder anyone's judgement becuase like I said, I have never had to deal with the stage 3 PCM

-$aldi