motordyne M370 manifold - round 2

esfourteen · 11-03-2010, 09:41 AM

Quote:

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.

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

Staples · 11-03-2010, 07:13 PM

Quote:

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.

Quote:

Originally Posted by esfourteen

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

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.

98intrigue · 11-04-2010, 01:32 PM

Quote:

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.

Duh! Thanks for making me remember

. This is my first time having my car on the dyno since my turbo G35, which I'd only see the data logs from my Utec that measured the AF right at the catless downpipe.

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