VGT Tables for E98

[SV8346]

So what are our chances of being able to adjust the Turbo Target Vane Position tables in OS 55491998(DSP4 - 65491998). Seem to be able to adjust these tables in nearly every other OS that uses them but the poor little E98 gets forgotten about and pushed into the back ground when it comes to developments.

[Tre-Cool]

i've played with in hpt, majority of the time it's still hit/miss for changes. (could be hpt's fault) but for a stock turbo setup probably not needed.

[GMPX]

I understand it appears that nothing is happening with the E98 but it isn't the case, in the last three months we've had to add DSP4 conversion patches for several 2016 & 2017 US OS's, support for new OS's 55504430, 55500370 & 55488112. Fixed some speed limiter cal errors on early OS's too.
Unfortunately the Holden OS is a bit of a bugger to work with and unfortunately I never find the time to find those tables between managing all the other mapping, sorry, trying to make it happen. And to add to what Tre-Cool said, others have said the same thing, modifying them in HPT for example doesn't tend to get the results anyway.

[The Alchemist]

hey there, just found another table that is urgently needed for the Colorado's here in NZ. The table I found in this video :
https://www.youtube.com/watch?v=HKu80j0bUHk detailing some tuning on a LBZ engine. The table is called B1122 Torque Fuel Limit RPM conversion.
I'm assuming theres a similar table in the LTZ Colorado as its the same ecu USED IN EACH. When I'm tuning these engine the fuel hits a brick wall at 104mm3 and flat lines until the commanded torque starts to drop off over 3200rpm. It just happens that this table in the video has a figure of 104mm3 in it which is what I am getting as a brick wall.
Can you confirm this is the problem ?
O/S 55500370

thanks,
Mike Ekdahl in NZ

[HOWQUICK]

hey there, just found another table that is urgently needed for the Colorado's here in NZ. The table I found in this video :
https://www.youtube.com/watch?v=HKu80j0bUHk detailing some tuning on a LBZ engine. The table is called B1122 Torque Fuel Limit RPM conversion.
I'm assuming theres a similar table in the LTZ Colorado as its the same ecu USED IN EACH. When I'm tuning these engine the fuel hits a brick wall at 104mm3 and flat lines until the commanded torque starts to drop off over 3200rpm. It just happens that this table in the video has a figure of 104mm3 in it which is what I am getting as a brick wall.
Can you confirm this is the problem ?
O/S 55500370

thanks,
Mike Ekdahl in NZ

We always are able to and you should be able to get to 120mm3. I have had others send files with same issue you are seeing....don't fudge the pulse table...

[SV8346]

Yeah but for some reason i am finding that at full noise turbo cant seem to keep up or something weird? Desired boost and max allowed boost is set to 340kpa which i believe is above the Map sensors control anyway yet at full throttle at around 3000rpm the boost drops away slowly down to 270kPa yet the vane % is still showing 40% which is telling me that the turbo is still being restricted by 40%? Would this be correct?

[Tre-Cool]

100% is the vanes are fully closed (max response, spool up)
0% is fully open (bypass, max flow out rear etc)

I think these turbo's just dont have the flow capability for pushing that much air at those rpm's. Your not alone with the issue.

[SV8346]

100% is the vanes are fully closed (max response, spool up)
0% is fully open (bypass, max flow out rear etc)

I think these turbo's just dont have the flow capability for pushing that much air at those rpm's. Your not alone with the issue.

So yeah when its reading 40%, is still 40% restricted? Is that not correct?

[HOWQUICK]

So yeah when its reading 40%, is still 40% restricted? Is that not correct?

wouldn't it be fair to say it is restricting the vain trying to get the boost target you are requesting?

[SV8346]

wouldn't it be fair to say it is restricting the vain trying to get the boost target you are requesting?

From what i have read the standard OEM program max's out at 40%. No matter what you do engine wise it will still be 40% restricted, it wont allow the turbo to use the remaining 40% of the turbo's flow, this is why i am trying to edit the vane table to be able to use that 40% as well.