Guys excuse me from asking a question that has been probably discussed in dozens of threads, but my tuner made a remark when he emailed a baseline file to me. He asked if I was using a log manifold and then he and was like "you'll probably need to run an open loop tune" making it seem like from a driveability standpoint there was a better option? So being a turbo newb I start researching and see that On3's turbo manifold is advertised as "a completely custom turbo manifold unlike any others currently on the market which is completely divided from bank to bank. Its not the typical log manifold that most make and run the driver side bank into. We have both banks completely separated up to the turbo flange which makes for a very cool looking and functional header"

Is there any benefit from separating the banks?

 

Log is my choice for a DD

The 2 narrowbands in the system work fine in the places they need to be.

You don't need to be open loop with your setup unless it has leaks

 

Thank you George for all your replies

Pulling the heads as we speak to take them to machine shop tomorrow, will have many more questions in the next couple weeks lol

 

Always wondered how a log manifold, not so much performed against a tubular individual bank manifold but how accurately it tuned against one. If that makes sense? With a log your driver side O2 is reading the correct bank but the passenger side O2 being after the log would be seeing both the left and right banks of the motor. Does this make the ECM basically guess? From what I could see either a system like the ON3 or the new divided bank Trick manifold would be better for a more accurate tune since your not I guess you could say showing the ECM incorrect data of whats really happening? Maybe I'm just thinking to far into this but just something I have always wondered if the two styles even made a difference. I have ran a log manifold before on two different motors and had zero issues as well as an individual bank tubular style manifold with no prob at all either. Also my tuner didn't mention or bring up any issues when I was on a log style manifold.

 

Where do the 02 sensors need to be or where would they work best? Im asking because the KBRacing kit on my brothers truck has a port before the turbo for the passenger side sensor and the Trick log on my truck has it in the downpipe.

 

the downpipe port is for the wideband o2 sensor.

In the log and on the driver's side goes the narrowband o2s

 

As he said^^^^

 

I figured as much but my trick manifold doesnt have a port on the log.

 

We put. Wideband and passenger narrow band in the down pipe on T4 manifolds.
T6 twin scroll and T6 open plenium both have it right befor the turbo.

The passenger narrow band sees the same if in the log right before the turbo or in the down pipe.
Where we put it in the down pipe. You don't have to pull the loom forward. To get to the manifold location.

 

I've been running my truck closed loop for its whole turbo life (8-9 years) Never an issue. Like said, stock o2 location on drivers side and right before the turbo on the pass side.

Also, you can't change the fueling from bank to bank with a stock computer anyway. So you dial in the MAF/VE table with the WB and it will run just fine in close loop with minimal fuel trims. No need for a open loop tune.