It's Alive - Delco 173

[stevemc32]

Thanks Jayme, I'll not be so concerned with the warm up readings and get on with the good stuff.

Holden202, I really only put the MAT sensor underneath the manifold as it's an ugly bugger and I wanted to hide it from view as much as possible. Would the charge temp tables be the place to work on the different heat soak characteristics of the two motors or is there some other parameter I'm missing? Not that I'm going to make any changes there at this stage but interested to know.

[Holden202T]

don't have access to see the exact table name, but its something like that ... coolant contribution for charge temp or something ?

[stevemc32]

It's still alive! Haven't been doing much tuning lately but have worked on trying to get the throttle body to fit nicely under the bonnet with the TPS at the top.

Had to go to a VY V6 throttle body which is smaller and the TPS is mounted closer to the body which helped with bonnet clearance, still wasn't enough though so I had to spin the TPS around to get the highest point some further clearance.

20150524_133324.jpg (182.65 KiB) Viewed 6215 times

Now the issue that has arisen is the changed TPS voltage range. It's still linear between 1.29V and 4.98V however $12p seems to only recognise the TPS up to 4.84V. I've adjusted the TPS full travel worst case min voltage so that I get 100% TPS at 4.84V however when I open the throttle further, ie TPS between 4.84V and 4.98V the TPS percentage drops to zero.

Is there a way to adjust the expected maximum beyond 4.84V?

Thanks.

[kojab]

TPS voltage will never reach 5 volts. The sensor is just made that way, 4.84v is normal and when you log it will read 100%.

[stevemc32]

Cheers kojab.

I mentioned in the post that I have twisted the TPS around so it's no longer in the factory position and uses the upper range of the sensor instead of something around the middle.

Took a quick log to show whats happening. It definitely gives 4.98V at full throttle as shown in the item lists. I'm using the 12PV111 1Bar ADX, I've forgotten if that's important when uploading logs.

[festy]

This might help explain your issue - I wasn't sure what you meant until I looked at your log.
At max TPS voltage, TPS% is showing zero:

TPS.jpg (30.03 KiB) Viewed 6202 times

[stevemc32]

Thanks festy. Yep, that's definitely the problem. If it just hung around at 100% it would be fine.

[kojab]

Sorry I too should have looked at your log. What you might have to do is add a resistor in series with the 5 volt supply to the TPS. This will reduce the tps output voltage. The Delco is clever enough to automatically work out its 0% and 100% TPS range although the linearity might be off due the sensor working backwards.

[stevemc32]

Yeah, was hoping it was just a setting change but guess it must be a hardcoded limit. Not a major drama, I just de-twisted the TPS a little by making up a new drive spacer that goes onto the end of the butterfly shaft. This got the voltage range down to 0.3 to 4.2V and the problem is solved.

Cheers guys.

For anyone that's interested here's the current state of tune. It's not there just yet but still can't get it out on the road to dial it in.

Would there be any benefit for me in upgrading to V112 of $12P given it's normally aspirated and will remain that way? Looked like mostly changes for boosted setups.

[Holden202T]

yeah i think anything from about v1.00 was pretty much bug free and the rest was additions for boost etc ....