Hey guys, curious whether anyone has a perspective on this. Here is a recent dyno graph from my b18a1 in a 1992 Integra. The motor is stock with the exception of a DC Sports 4-2-1 header, AEM CAI. A valve job was just completed.

I don't know a lot about Honda tuning -- this motor seems to like things pretty lean -- it is making power until it hits a dip at 4,300 rpm -- it goes a little too lean and then goes dead rich.

Any ideas/thoughts greatly appreciated!

 

are you using a stock ecu now, getting my motor/ecu tuned made a huge difference.

 

Since I'm running PTE I can't do the ECU without taking points, and I don't have enough points to do it.

It's a stock ECU.

 

What software are you using to tune your motor?

 

No software, it's a stock ECU. The real question I guess, is whether the air/fuel is being affected by something other than the ECU mapping. For example I know that there is a fuel pressure switch that increases fuel pressure at some point, but I don't know where that kicks in.

 

That could be from the aem cai. That intake typically creates a bump in the power curve around 3500-4500. I would also try to get at least some air/fuel tuning done.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96Spec Ek &raquo;</TD></TR><TR><TD CLASS="quote">That could be from the aem cai. That intake typically creates a bump in the power curve around 3500-4500. I would also try to get at least some air/fuel tuning done. </TD></TR></TABLE>

That's exactly what's happening.

Looking at the air/fuel graph is just like looking at the power graph itself. Where the bump goes up and lean between 4000-4500 rpm is where the intake is at it's highest volumetric efficiency. It goes a little rich after that point (when volumetric efficiency decreases) and power dips accordingly. This is a classic examply of why external tuning devices such as Hondata/Neptune/Crome etc are so important. Without them, your car will make power but power along with air/fuel will be all over the map. With tuning you can take advantage of all the bolt on parts and make more power in those "juicy" areas and carry power longer, with little or no power fall off, right across the power band.

"give a man a sword - he becomes more powerful. Give a man training on how to harness and use the sword, he becomes a true master"