LS1 5.7L with BTR Stage 4 camshaft, where to start tune it?

Hello everyone, my name is Pier and I'm from Italy

Installed stock LS engines for a while and now I'm starting modify it. I use HP Tuners software for VATS and small other things so I would go ahead with it.

I recently installed a new Stage4 camshaft on LS1 and would start tune it. I already have a wideband sensors on the exhaust to check the Lambda value. Any suggestions on how to proceed?

P.S. I already watched all the fundamentals curses and starting now the practical curses here.

Thanks in advance

Pier

Hi Pier, I'd suggest with a reasonable size cam that you'd be best to perform a 1 bar SD patch and remove the MAF sensor. This will then allow you to tune using the VE table in the LS1 ECM. Basically you need to adjust the VE numbers until your commanded AFR and measured AFR match. You can follow the SD worked example in the course to see how this works - It is on a later model ECM so the VE numbers are very different but the general procedure is the same.

with a large cam you'll also need to raise your idle speed and adjust your base running airflow tables to maintain a suitable idle speed. I don't know what the specs on your cam are but depending on lift and duration you may need to raise the idle targets to 700-800 or thereabouts.

Andre

Thansk for your answer, trying to do what you suggested. Here the cam specs installed BTR STAGE 4 TRUCK CAM Specs are 224/230 .553/.547 111+2

Andre

When I remove the factory MAF sensor converting the OS to 1bar SD, does I have to phisically remove or disconnect the factory MAF sensor or it have to be in place and connected?

That cam is actually relatively mild so you should be able to get good idle and driveability. When you perform an SD patch you need to have the MAF unplugged but you will need a standalone IAT sensor since the IAT sensor the ECM uses now is the one in the MAF. There are various patch harnesses available to make this pretty easy. While you could leave the MAF in place, it is a proven restriction on the Gen 3 LS1 and I'd recommend getting it out of the intake.

Simon

My engine runs 3 pin MAF so IAT sensor is alone on the intake pipe. Does this procedure to remove the MAF and go with 1bar SD patch is just for the tuning session or till now the engine will run's with no MAF?

Also, on my PCM I have some different options for Operating System. On your SD Worked Example you choose a 2bar SD Sensor. When you talk about 1bar SD sensor you mean 1 bar overall or 1 bar more than absolute pressure? Check out the screen...