slowjoe99

iTrader: (7)

I've heard there are two differnet LS1 computers in f bodies, 1 computer for the 98-00 and a newer, faster computer in the 01-02 cars. I heard the newer computer has options for nitrous (along with a lot of other options). It will only adjust timing when using nitrous and keep it normal when not using it. Any of this sound right?

slow

iTrader: (7)

Actually there are 3, 98, 99-00, and 01-02

http://www.gmhightechperformance.com...cms/index.html

98 is unique, different pinout, and not compatible with others.

99-00 service number is 09354896

01-02 is a board respin, and different processor, service number 12200411

99-00 and 01-02 are interchangable, and I have never seen a reason for a 99-00 being worse than a 01-02, in practical use.

The options for n20 and other "custom OS's) are all done by third parties (EFI live, and HPtuners) and can work on most 99-02 pcms (but not all stock OS's are supported, and this is why most go to a 01-02 OS)

Ryan

foff667

iTrader: (2)

Just as a side note, we offer custom os's for nearly every stock operating system from 98-07.

slowjoe99

iTrader: (7)

thanks a ton man!

2002_Z28_Six_Speed

iTrader: (19)

The later OS will run on the older slower PCM.

The later PCM has a faster processor but practially no one can really take advantage of that.

slow

iTrader: (7)

I keep forgetting you have a custom OS for 98's, too bad there wasn't a way for me to use it with my roadrunner

Ryan

richard_lyew

hi all, does anybody have the PCM/ECU/ECM pinout for the 1999 GMC Yukon Denali V8?

Tsann94

How do i go about getting and os changed?

G Atsma

You're addressing a 13 year old thread, and foff667 hasn't been here for 6 of those years