98 TA LS1 ECM or 01 WS6 ECM?

[rat_rod_russell]

I have a 98 LS1 for my 57 Chevy project with the wiring harness already built to for the 98 TA motor. I intend on building a built .60 block for turbo aplacation and swapping is alter i get the chassis tweaked.

I found a guy who carbed a 01 WS6 for his hot rod and has everything on the pull out. Would it be better for me to get the later model ECM for my buildup?

I've only worked on tuning 3 cars
1932 ford roadster (with the 98 LS1 that's not in the 57)
98 Corvette
98 Z28

is it worth the trouble?

thanks
R^3

[joecar]

The 2001 PCM allows you to run an OS that is easier to tune with.

[rat_rod_russell]

I'm looking at COS3 or possibly 5 with a 2 bar MAP and no MAF with remote boost controller so i can run a nice street able 5-6 PSI and jump it to 10-12 PSI when i need it.

[joecar]

If you want COS5, then you need a PCM that will run OS 12212156...
The 2001 F-car PCM (GM part # 12200411) will do that.

[eboggs_jkvl]

OK, the geezer is asking something.

You have a 98 wiring harness? If you use a 99+ OS, you would need a 99+ wiring harness wouldn't you?

The later model PCM would be great but you'd need to bring along the wiring harness with it OR rearrange the 98 wiring harness pinouts at the PCM to reflect the 99+ arrangement.

Going back to my nap now...

Elmer

[joecar]

Doc has the info on doing the 98->02 conversion... I believe he repinned the PCM connectors...

I should collect together all the relevant threads and sticky them.

[Cougar281]

Stupid Question: What's the difference between the 98 LS1 and the 99-07 LS1 PCMs? Seems SOME have 1MB flash, but most have 512K.

[eboggs_jkvl]

Stupid Question: What's the difference between the 98 LS1 and the 99-07 LS1 PCMs? Seems SOME have 1MB flash, but most have 512K.


I'm sure the MB is different in the newer models but the wiring is the same for the 99+. THe 98 is the bastard step child and has different pinouts at the PCM.

[eurospec1]

Stupid Question: What's the difference between the 98 LS1 and the 99-07 LS1 PCMs? Seems SOME have 1MB flash, but most have 512K.

97-98 PCM's are not 512 kb's, not sure what they are but there the bastards of the LS PCM World, and not capable of much tuning wise

99-02 LS1 PCM's are 512 KB and are recognizable by the connectors on the PCM itself beeing labled as red/blue

03+ PCM's are 1 MB and i belive some of the newer ones are even 2 MB

[Cougar281]

97-98 PCM's are not 512 kb's, not sure what they are but there the bastards of the LS PCM World, and not capable of much tuning wise

99-02 LS1 PCM's are 512 KB and are recognizable by the connectors on the PCM itself beeing labled as red/blue

03+ PCM's are 1 MB and i belive some of the newer ones are even 2 MB

Not sure what they are then, but according to EFILive, the PCM Flash size shown in one of the 98 Corvette files from holdencrazy it is 512k :nixweiss:.

[hquick]

On the trucks, the 96-97's are 257kb and the 98's are 336kb.
Just repin and use the 0411 99+ PCM. Not too difficult and a hell of alot better/easier in the long run.

[Cougar281]

On the trucks, the 96-97's are 257kb and the 98's are 336kb.
Just repin and use the 0411 99+ PCM. Not too difficult and a hell of alot better/easier in the long run.

The cars myst have yet another version. Thetun file size is 470k. :nixweiss:

[eboggs_jkvl]

My 98 tunes are 469 KB in size. The 98 PCM can be tuned, just might take a tad more effort. Mine seems to be ok for my needs.


Elmer

[joecar]

And, flashing 97/98's does not cost any licenses.

[rat_rod_russell]

Who knows what pins need to be changed to work. I might just keep the harness I have and go get the ecm from GM. My motor also has the 3 pin coolant temp sensor. will that make any difference or will i need to rewire it ?

I get the good price from them and stuffs not too expensive for the added piece of mind.

R^3

[eboggs_jkvl]

Who knows what pins need to be changed to work. I might just keep the harness I have and go get the ecm from GM. My motor also has the 3 pin coolant temp sensor. will that make any difference or will i need to rewire it ?

I get the good price from them and stuffs not too expensive for the added piece of mind.

R^3


Talk to "Doc"

[Doc]

The "extra" wire on the ECT sensor is/was for the 98 Fbody cluster. No worries, you could probably incorporate it in a stand alone gage on your custom project. ChipsByAl- already posted a nice write up on this subject. Go into the tuning tool manual and study up on the advantages of B3647. Study the increased resolution for fueling that the COS's have. Increased resolution=improved drivability and consistent performance. And as always read, digest and use the information contained in Appendix B- which I think is a fundamental that cannot be overlooked.

[hquick]

Good tips Doc.
In my opinion there is no point stuffing around with the 97-98 PCM when the swap to the 0411 is so easy and the benefits are so good (COS's).
There are much cheaper places to buy new PCM's than the dealer.
Joe...did you end up getting one?

[joecar]

Good tips Doc.
In my opinion there is no point stuffing around with the 97-98 PCM when the swap to the 0411 is so easy and the benefits are so good (COS's).
There are much cheaper places to buy new PCM's than the dealer.
Joe...did you end up getting one?I ended up getting a reman PCM for $90 plus $60 core fee (but I intend to keep both, I'm not too concerned about the $60), has 1 year warranty (claims it's been resoldered, reconformal coated, etc...)...

Now I just need to sleep less and install it to make sure it works... :cheers:

If you go to eBay, they are about $90 (no core fee) for one that came off a wrecked vehicle, should be ok...

Edit: I need one that would be reliable because I don't want to waste any licenses.

[Doc]

Psst! Look for salvaged truck pcms- most yards don't know they will work and are generally cheaper.

[Cougar281]

Psst! Look for salvaged truck pcms- most yards don't know they will work and are generally cheaper.

I was looking for grins... The 0411 can be found as cheap as $30. I wouldn't worry about a "junkyard" PCM as long as it appears in good shape. I've been running one in my LLY for almost a year without so much as a hiccup.

[joecar]

I've had a few "experiences" with my local yard about 10 years ago, so I'm a bit wary...

[shallow bay]

I bought mine from Jesse (wait4me) for $75 plus shipping.

[rat_rod_russell]

I just got off the phone with Jesse.
160 !^)#ing pins screw that. i think this one just gets to keep the 98. I'll sell it and build the 4 door wagon i have.

R^3

[voda1]

ECM useage:

#16232148 97Vette
#16238212 98Vette, Camaro, Firebird
#9354896 99/00 Vette, Camaro, Firebird
#12200411 01/02 Camaro, Firebird
#12200411 01-03 Vette
#89017739 04 Vette, GTO

[rat_rod_russell]

What about the GTO's / Holland's and the GM Trucks?

R^3

[Cougar281]

ECM useage:

#16232148 97Vette
#16238212 98Vette, Camaro, Firebird
#9354896 99/00 Vette, Camaro, Firebird
#12200411 01/02 Camaro, Firebird
#12200411 01-03 Vette
#89017739 04 Vette

The 12200411 can also befound in some S-10's and Safari's. Just FYI...