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I am no expert, but I have been down this road. I believe you are spot on with the VSS situation and in addition the automatic transmission data also interfaces with torque settings. You absolutely...

I am polishing my tune and note that ECM 14072 is set at 8192 rpm. Other similar tunes in my repository have the setting much lower; around 500 rpm. Some are like mine, set at 8192.

If the...

That is the one I have on my Porsche 986/LS3. An accurate VSS fixed all my problems. Many of the E38 tables have speed as an axis. There probably are some tables that use VSS that you cannot see...

This entire thread reminds me of rolling in the mud with a pig. Suddenly you realize the pig likes it.

Amille
The VSS you added has nothing to do with the Porsche and everything to do with the E38. You have not provided a log so I cannot confirm it is working. Even if it is working it has to be...

Is the VSS you added working? Does speed register when you log the vehicle while it is moving? A closer look at your E38 speedo tab leads me to believe you need work. Probably need to set output to...

First, you did good to add a VSS to the car because it does not have one. Next you did good to use an E38 for the gen 4 corvette and hopefully the VIN is for a manual transmission.

If the E38 is...

open your tune in HPtuners; then open the repository tune as a comparison tune. Now open the comparison log. In the log go from item to item and chose copy over difference if you prefer the...

I have an LS3 and your question raised my curiosity because I never heard it before. I looked at my tune and the electronic throttle section and what I believe is that it is a programable way to...

Thanks for the response Alvin, I'll have to get back with you on the log showing the bucking. The one above is with the car stationary and does not show any bucking. My car does have a VSS. To...

So, I have a 2008 DBW L92, Corvette manual trans E38, with a comp cam, LS3 injectors and car intake. The engine actually runs quite good. I get a little bit of bucking when the IAT is at its...

O.K. .............So my fuel trims are adding up to a little more than minus ten in the idle to 2000 rpm area. If I reduce the MAF HZ in that range will the ECU see less air and reduce the fuel? Is...

There is an old saying that If you don't know where you are going any way you go will get you there.
I want to calibrate my MAF and need to know where I am going. I have a Frankenstein engine that...

you probably need to disable the starter diag and starter fault items as part of the VATS disable.

marcmcg

You have a lot to consider with your swap. First, I am no expert but have this to offer. The L92 is a gen 4 and you appear to recognize this by the 58X conversion. You do not mention...

I just finished adapting an engine like yours to a car of a different manufacturer. I have also been a boater for years. Here are my thoughts.

the engine you describe is drive by wire so you...

I am no expert but getting an Arduino or rasberry pi to listen and talk to your CAN buss is easy compared to the real trick of then to reverse engineer the communications so you can know what you are...

By moving your injector table to the left you now have the table for a 44.3#/hr at 60 psi injector instead of 42#/hr at 60 psi. The computer is going to shorten the pulse length allowing for the...

Shifting the flow vrs pressure table to the left or right has the effect of changing the injector size. Remember your injectors are RATED at 42#/hr at 60 PSI. Shifting is like applying an offset. ...

Fuel/general/rail pressure minimum 13541 and fuel/general/rail pressure max 13542 were set at 55 psi. My logged injector flow is sensitive to these rail pressure settings. Good luck.

LS3 injectors are rated at 42# per hour at 60 PSIG. The flow from these injectors for our purposes is directly proportional to the square root of the pressure. Flow rates and pressures meeting this...

HPTuners will not get you what you need. You need programming by GM Software. Others that know much more than me will chime in here and tell you how to use GM software or subscription and VIN to get...

Sorry, there seems to be confusion all round. MDI2 is an aftermarket wifi interface for GM vehicles not a GM made device. You need software to use the interface. With no mention of the intended...

I think the manual and automatic E38s are probably the same hardware. However, HP tuners does not have the ability to change the transmission from automatic to manual or vice versa.

I recommend...

HP tuners does not handle automatic to manual transmission changes. The manual, automatic selection box does nothing as you have discovered. Until you change to an ECM that has a manual...