duvaala

I tried to update my PCM to 2 bar OS but there is no option on HPT, when I contacted to HPT support they told me that there is not custom os for my PCM.

Is there any option like change all map related tables to half values or write a complete OS from other 98 2 bar os, or modify my OS with some hex editor, etc.???

I'd like to try all options before go for 99+ pcm.

thanks

LilJayV10

iTrader: (39)

That's strange. I did a 2 bar COS in a 98 vette a couple months ago that we Procharged.

Do a 411 swap and be done with it.

duvaala

Thanks for the reply.

Has anyone else had this issue?

2xLS1

iTrader: (25)

What is the OS number and transmission type? I have copies of what I thought was every OS used in 98 and they all have a 2 Bar OS.

duvaala

Os: 9366200

duvaala

OS: 9366200
Trans A4

2xLS1

iTrader: (25)

Well i don't have that one and have never seen it. What is the VIN #? If you don't want to post it you can PM it to me.

duvaala

hpt info

Hardware: V8_97_98, GM Gen3 V8
VIN: 2G1FP22GXW2132677
Serial: 0J1JRX8042
OS: 9366200

thanks

2xLS1

iTrader: (25)

You must have a one of a kind car. GM TIS shows that there is a new calibration for your vehicle that updated 9366200 to 9375582. (New calibration to correct the A/C compressor from cycling improperly during heavy acceleration.) Unfortunately I don't have that calibration either to see if there is a custom OS for it. I looked at over 50 98 F-body files I have that I've read out since I started tuning. I don't have one with your OS and the closest I have to what you can update yours to is 9375573, 9375574 and 9375577. I can tell you that for those there is a 2 bar OS available for them. You asked what your options are before you repin for a 99+. You could ask HP Tuners if there is a 2 bar OS for 9375582 and if there is then update your PCM with GM TIS, or you could do a write entire with another 98 F-body OS that has a 2 Bar OS. HP Tuners won't let you put your VIN in an OS it never came with but that may or may not be important to you. Is this a GM export vehicle? Here is the link to where you can check the complete OS update history for your vehicle.

https://tis2web.service.gm.com/tis2web

MontecarloDrag

iTrader: (3)

Be aware that flashing a different OS to a 98 PCM can easily brick it. I suggest having a plan B if that happens.
For a boosted engine I would upgrade to a 99+ PCM regardless since it's faster, has more custom OS options including Real Time Tuning and it's cheap to replace.
For the money you can get selling the 98 PCM on ebay you can do all the work for a 99+ swap.

2xLS1

iTrader: (25)

I have yet to brick a 98 PCM flashing them with different vehicle OS. Have done lots of them. But I always use a older HP Tuners serial interface or Tunercat OBD2 serial interface and a reliable bench harness and power supply. I tell you the older serial interfaces are rock solid for just flat out working.

duvaala

thaks for the information.

Hpt confim that OS 9375582 has 2 bar OS available but I think is hard to find.

2xLS1

iTrader: (25)

Anyone with access to TIS2Web and a Tech2 or GM MDI can update your PCM to OS 9375582.

duvaala

Thank everybody.

I found the OS 9375582 . Is it possible to get only the 2bar os or do I need to use 2 credits for license the file and 2 more credit to get 2 bar?


I attached the file in case it serves someone else.

regards

2xLS1

iTrader: (25)

If you just get your PCM updated with TIS2Web you won't have re license anything if your PCM is already licensed. The update changes the OS to 9375582. And custom OS are free.

duvaala

No, The file is from a friend's car. That's why I want to get the 2 bar os and do a entire write to my pcm

2xLS1

iTrader: (25)

I've been doing this a long time and have given you the proper procedure for doing this but you don't seem to want to take my advice. So I'm done.

MontecarloDrag

iTrader: (3)

I will flash your file to a 98 PCM I have lying around. I will try to modify it so you don't need to use more credits.

ddnspider

iTrader: (26)

Is the Vette PCM different than fbody? I've asked for years and everyone says there is no 98 custom is.

sbcgenII

iTrader: (1)

I believe they are the same. I have a 98fbody with 2 bar OS. Its a free upgrade with HPT aswell.