I've been getting mixed information on this. My tuner is setting me up with a turbo tune using a stock OS and the MAF sensor, I believe because my goals should be within the limits of the stock OS and MAF. Unfortunately my 1 bar MAP sensor is useless for logging boost. I have a 2 bar MAP sensor here and was wondering if it will work with a stock LS1B OS (12212156) using the MAF sensor if I change the scalar (C6301) appropriately. I know the tune will still "max out" at 1 bar, I just want the 2 bar sensor for logging boost in the scan tool.

Some say I need to go to a COS to use a 2 bar MAP sensor, but then I believe I also have to ditch the MAF and go SD. I'd prefer to keep the MAF sensor due to the altitude and temp changes I see daily. I'm using EFILive.

Thanks!

 

I'm not sure if EFI Live is able to do what you're asking. But.... HPTuners can not.

With HPT, if you want to use a 2 bar MAP sensor, you need the 2 bar OS for it to work. And according to HPT, the 2 bar OS was never intended to work properly while retaining the MAF. I tried it anyways once, and failed. It was completely unstable.

 

It sort of depends on the PCM. I have upgraded to a 2 bar operating system from HPT and used the MAF primarily. In fact that's the truck that the customer rushed me to tune and is running on MAF only...

 

This is what I have read also which kinda sucks. Would love to be able to have boost enrich and be able to log boost while still retaining the MAF since the new sensors in the Gen IV engines can handle quite a bit.


Not sure I want to switch to just SD..

 

You can use a 2 bar Custom Operating System in EFILive and retain the MAF...

 

Any tips on how to do this? The LS1 COS tutorial says otherwise.

 

The tutorials are ok at best... They were written a long time ago with limited knowledge for boosted setups and never updated. You can go with the 2 bar COS and keep the MAF enabled and tune it. It will just fail when you max it. Some os's stay failed, some don't. Just leave it on and see what happens when you max it. I've tuned both ways with my truck. High RPMs with boost is the only time you will flow enough air to max it. Every day driving, it will be fine. At most it should default to just the VE table till you turn the truck off then back on again.

 

The tutorials are written assuming that you wouldn't switch to a 2 bar if you were keeping the MAF - most don't. But, it will work up to the point that you max the MAF, as said above. I would add that if done properly, speed density is not a problem in varying temps/altitudes...

 

Thanks for the help. I'll probably try COS3 or COS5 with the MAF. How would I know for sure that it's using the MAF and not VE?

Also, the stock MAF is good to 512 g/s, what is the LS7 card style MAF good to? And will the LS7 MAF work with an LS1B PCM assuming the calibration table is correct?

 

It's not the MAF that's the issue, it's the PCM. It can't understand more then about 512 g/s. Any style MAF can be uses as long as you calibrate for it. You can tune the MAF in the same way you tune the VE with auto VE. You just set B0120 to something like 1200rpm and it will run exclusively off the MAF over that RPM for tuning it with the BEN factor.