motordyne M370 manifold - round 2

Originally Posted by Staples

When I had my car tuned, we were seeing some dips like that, so we added fuel to drop it down to 12.5 - 12.6 at wide open, added 2 degrees of timing and I ended up making 8whp more. I've seen a lot of the 370z and G37 tuned with UpRev and for some reason, they like extra fuel. 12.5 - 12.8 A/F seems to be making the most amount of horsepower / torque.

Originally Posted by 98intrigue

Yes, my tuner said that he's seen 12.8 to be the sweet spot. I remember looking at the UpRev window and seeing the fuel right st 12.8, so I'm not sure why the graph shows 13.2.

Originally Posted by 98intrigue

Yes, my tuner said that he's seen 12.8 to be the sweet spot. I remember looking at the UpRev window and seeing the fuel right st 12.8, so I'm not sure why the graph shows 13.2.

Originally Posted by esfourteen

it was probably reading from the exhaust tip which usually reads a bit leaner

Originally Posted by Staples

That's absolutely correct... When you have cats and you're measuring air/fuel from the exhaust tip, more air then fuel is going to make it out of the car which is why the graph will read leaner because the tuner is compensating.