looks like your clutch is slipping.

 

Pull the gear cover off....

You'll see two notches on the valve cover itself above the gears respectively. You'll also notice the gears have marks as well, line up the two on each gear with their respective marks on the valve cover. Then shine a light at the crank pulley and see if the pulley and notch line up as well...

Easier with pictures than an explanation. Let me know if I sound drunk because I am...

 

Since your clutch was slipping some I would put a clutch in the car and see if you have the same problem, you need one anyway. It looks like that might be the problem, the car is dropping off at the point where it makes the highest power therefore if the clutch is bad your results would show a huge drop at higher RPM's when the clutch is slipping the most. Good luck

 

I'm having the same issue with the clutch. Damn thing was slipping a bit during my dyno tune so it got OK #'s but not great. Good thing about a dyno dynamics is that it can tell when a clutch is about ready to go due to the load. You probably wouldn't tell it's slipping if it were a dynojet.

 

i was thinking that too, but you could hear the clutch slip, then catch and can kinda see in on the AF ratio line around 4000rpm. so you guys think the clutch kept slipping after that? if it was the clutch causing it wouldnt it just straight slip and never catch? i mean you could hear it pretty well where it would slip for a slip second an then catch. i guess what im asking is if a clutch is gonna slip wouldnt it just get worse the higher the rpm?

 

AFR going into the 10's...bleh

 

10 a little lean? isnt it supposed to be around 12ish?

 

Wrong... 10 is rich

Should be around low to mid 11's

 

okay so just so to clairify for my dumbass a good AFR is 11.5. how is that measured weight? or volume? im assuming volume?

 

AFR by definition

Air Fuel Ratio...

Measured by Wideband Sensor setup found in most dyno shops and in the form of kits like the one I own. Zeitronix ZT-2

 

no no, i ment what units are the air and fuel measured in? in order to measure a gas and liquid gas with the same unit?

 

First off its a ratio thus unit of measurement independent. 1:2 is the same if its 1 vs 2 swimming pools or 1 vs 2 cups of water.

Secondly an AFR meter doesn't read how much gas goes into the chamber, instead it measures the byproduct of the burn. Technical info below.

Technical:
The sensor itself is an oxygen pump where it pumps oxygen from the outside into the sensor cavity. An electrical current through the pump cell transports the oxygen ions. If the current flows in one direction, oxygen ions are transported from the outside air into the sensor, in the other direction oxygen ions are transported out of the sensor to the outside air. The magnitude of the current determines how many oxygen ions/second are transported, just like the electrical current through a fuel pump determines the fuel transport rate.

In a rich condition the WBO2 controller regulates the pump cell current such that just enough oxygen ions are pumped into the chamber to consume all oxidizable combustion products. This basically produces a stoichiometric condition in the measurement chamber. In a lean condition the controller reverses the pump current so that all oxygen ions are pumped out of the measurement chamber and a stoichiometric condition again exists there. The pump cell is strong enough to pump all oxygen out of the measurement chamber even if it was filled with free air.

Based on the current flow and control an approximate AFR can be determined. Hope that clears up the air....

 

It is a ratio! So, therefore no units are used.

 

Big shooter on a boosted car with pump gas 12's are considered a bit lean, mid 11's about right and 10's too rich.

you'll find different opinions but that's a pretty good rule of thumb.

 

No need to take your car anywhere else man, DB Performance is a top notch shop. I have trusted them with my evo several times and they are always good to me. The dyno is dyno dynamics, it is a great dyno.

I would tripple-check the cam gears....what cams do you have? Possibly consider ditching the cam gears? Fix the clutch and then find the rest of your problems, something is goofy dude....