CSIXX1

I have a friend who is thinking about buying a C5 Z06 but he heard that there was a certain year or years that had issues with the ECU.

DOUG @ ECS

All Zo6's have the same PCM.

tblu92

Yes the Z06's came out in 2001 so all the early Z06 and C5's are the same---What they are probably talking about is in the early NON Z06 C5's with the old 3.5" MAF's the HZ table in the ECM was limited to 11250 HZ which equates to Apprx 425-450 RWHP before you ran out of table---However all you needed to do was to switch to a speed density tune or an open loop tune on those older c5's and you could make them work fine--
In 2001 the HZ table on all C5's increased to 12500---( 500 RWHP approx.)

DOUG @ ECS

Update the operating system and tune it correctly.

tblu92

Yes you can also do a "FULL FLASH" and update your ECM to a later year's operating system--but then must update your MAF as well--It can be tuned using your old MAF but much more work for the tuner and far less accurate---If you update to a 2005 OS system --it's best to change the MAF to a 2005 MAF so they match and the table is more accurate JMHO

DOUG @ ECS

2005 is not the same computer and the operating systems are not compatible.

tblu92

That's what I'm saying----You can update the OS to a newer year model--so your ECM will have a larger MAF table---But then you must also install the larger MAF from the newer year as well or you aren't gaining anything---Yes That's what I'm saying they are NOT compatible
PS : there are other issues as well---2005 was a strange year for 02's and cats as well ---Independent from other years of the LS1B ---
1997-1998 -- LS1A
1999-2008 ---- LS1B
2009-2013------E38
2014------------E92
UPDATE the 2005 Corvette does have an independent one year only computer-E40

Rookieracer

Isn't the 2004 different than the 1999-2003? 512k flash for the earlier and 1024k for the 2004.

romandian

would you care to explain, what has to be done?

DOUG @ ECS

Correct, I literally laughed typing that to see if it would be brought up.



I'll do my best, but the best start is to ignore what was posted previously.


You can update your operating system to a newer operating system that fits your vehicles computer as long as it fits your needs. Meaning auto's must have an auto OS.
You do not need to update anything else in the car if you do not wish to, you just have to rescale your MAF table in that operating system if you are going from the older MAF to a newer OS which uses the larger MAF. I often just start with an older MAF table and scale it properly threw tuning and data logging. However just updating the MAF at that time is usually the best answer.

By updating the operating system you are running off of the latest GM software, think of it as going from Windows 7 to 8. There are many things "behind the scenes" that cannot be seen with EFI or HP tuners that make the car perform a little better.


But the point of this thread was if there is a particular year/PCM to stay away from, and that answer in my experience would be no, they are all basically identical. The 04 is actually a better PCM, but I have yet to see any advantage from it. The basic layout is the same, and it functions identical to the 99-03 PCM's which is why I didn't categorize it separately although technically I should have.

The only PCM's I am not the biggest fan of is the 97-98 because it is about as technically advanced as a cell phone of the same era, and the 05 E40 because it has the most glitches and least support from the aftermarket.


I hope I answered your question.

SVT_Z06

Fwiw....the 01-02's have the 0411 PCM. 03's-04's have a different one. Several transient fuel tables are missing from the 03-04 years. I have 02 maps and I have an 04 and see all the differences. Yes, I tune. I wish I had the 0411 pcm.