Well got my Prelude dynoed this morning. I have dynoed it many times in the past but this is the first time with a/f. Anyway the power is good but it seems to be running lean. Since I haven't changed anything in over a year I presume it has been running lean for a while. I have never heard any pinging and the plugs always look great. Also my POS Autometer a/f gauge still reads in the green.

Stock H22a4 block and head
AEM Intake
Hondata IM Gasket w/ blocked EGR
DC header
Test Pipe
Greddy Evo Exhaust
VAFC
ECU reset mod
Coolant by-pass mod






[Modified by DR, 3:12 PM 2/1/2003]

 

Post the dyno, let's see the a/f curve.

 

OK, wow... are you sure that air/fuel is right, have you adjusted the VAFC? I looks just like my air/fuel, but mine is in the 11.7 range after 3k rpms.. I have never seen a mostly stock lude that lean..

 

I think these A/F settings look wrong as well since I am pretty sure I would be loosing power if I was really that lean. Here are my VAFC settings

LVT
1000 -3
2000 -3
3000 -3
4000 -3
5000 -3

HVT
4000 -0
4500 -0
5000 -0
5500 -3
6000 -7
7000 -10
7700 -10

 

Wow, that's pretty lean for open loop WOT. I see no reason to fault the wideband. You are reaching 15:1 from 6k and above, which seems to correlate with your fuel settings 6k and above. Why are you subtracting so much fuel in the high end? What did the tuner have to say?


[Modified by sharkcohen, 12:32 AM 2/2/2003]


[Modified by sharkcohen, 12:33 AM 2/2/2003]

 

Well here's a my stock VTEC A/F......see how much fuel it dumps?

 

Something is definately wrong if that is your true a/f ratio.

On a side note, with those mods, you're making awesome power!

 

don't you have a type-s ecu?

 

ewww... tune it to 12:1 or 13:1...

 

At what cost? THe A/F ratio indicates he's gonna have some problems if that keeps up..