E38 and 512 gps limit

[eboggs_jkvl]

Is there an OS that can be loaded into the E38 that will remove the 512 GPS MAF restriction?

That's it, nothing too hard to answer.

I'm asking in connection with my 2.5 BAR MAP and E-Force supercharger.

If the tune is scaled, all of the tables for air and fuel need to be scaled by 25%. If the tune is unscaled, then the PE table is "adjusted" to cover the area above the MAF table.


Elmer

[ScarabEpic22]

Hmmm I thought that was only a restriction on 06 E38s, maybe the 07s are affected as well. Im pretty sure my 08 E67 doesnt have the 512g/s restriction, if it is table {B1099} then mine goes to 3000 g/s.

Could you upgrade to a 2008 E38 and OS to get around the limit? Might cost you a new E38 and license though.

[gmh308]

Is there an OS that can be loaded into the E38 that will remove the 512 GPS MAF restriction?

That's it, nothing too hard to answer.

I'm asking in connection with my 2.5 BAR MAP and E-Force supercharger.

If the tune is scaled, all of the tables for air and fuel need to be scaled by 25%. If the tune is unscaled, then the PE table is "adjusted" to cover the area above the MAF table.


Elmer

'08's generally have the 3kg/s limit as Erik notes. LS7 being at least one exception.

[swingtan]

As above.

The other thing is that the OS change to allow greater than 512gm/S was about the same time as the ECM firmware change that made it rather difficult to swap OS's between early and late E38 ECMs. I never noticed if that was ever fixed, but there was a table that listed compatible OS's with ECM part numbers. The problem was that if you tried using the wrong OS in an ECM, you ended up with a wheel chock.... So don't go flashing in a latter OS without checking.

Simon

[turbo_bu]

swingtan,

Do you happen to know if the 07's still had the 512 gps limit? I know the E38 / E67 ECM list groups them as 06-08 and 09 and newer. Was hoping that the break in OS's and ECM's might be able to be further refined.

[ScarabEpic22]

Elmer's Vette is an 07 E38 and has the restriction, I can check later tonight and see if the 07 TBSS file I have has the same 512g/s restriction or if it has the 3000g/s one like my 08.

[swingtan]

I just looked at a late 2007 tune.

OS: 12619078

With the latest calibration file it has a 3000gm/S MAF limit on it. It seems this OS was used through to 2008 as well in the Holden based vehicles. I don't have a late 2006 (VE) tune, but early 2006 (VZ) certainly had the limit. I'll bet that the late 2006 tunes had the limit as well.

The quickest way to tell if the 512gm/S limit applies, is to check if the tune uses HI/LOW MAF conversion tables or just a single MAF conversion table. If the tune has the HI/LOW tables, it'll have the 512gm/S limit. At least all the ones I've seen are like that.

Simon.

[ScarabEpic22]

Just checked the 2007 TBSS (OS 12611938) file I have and compared it to my 2008 TBSS (OS 12618164). The 07 has the 2 MAF tables and 512g/s limit, the 08 has 1 MAF table and 3000g/s limit. I "full" flashed the 2008 OS over the 2007 one in my spare ECM and havent had any issues. (Helps when the donor platform is the same between the OSs.) Wonder if Elmer could do the same, anyone got a late 2007 Vette file with the 3000 g/s limit?

So yep, Simon you're dead on for the 2 vs. 1 MAF tables and g/s limits.

[turbo_bu]

I was wondering if this would be just a full flash of a newer OS, or if something else might be required. Like a different MAF sensor ... or if there was something physical inside of the E38 that was also updated (hardware change) to compensate for the added range. Anyone know if the MAF itself changed from say 2007 to 2008 on an E38 vehicle (like the TBSS's that ScarabEpic22 listed)?

[gmh308]

I was wondering if this would be just a full flash of a newer OS, or if something else might be required. Like a different MAF sensor ... or if there was something physical inside of the E38 that was also updated (hardware change) to compensate for the added range. Anyone know if the MAF itself changed from say 2007 to 2008 on an E38 vehicle (like the TBSS's that ScarabEpic22 listed)?

It's simply a 2008 OS - which supports the 3000g/s MAF. Only 2008 OS I have seen that doesnt support the 3000g/s MAF is the LS7.

Anyone have a 2008 TBSS that has been converted to regular electric fans?