Dyno Pull Shows Rich

scalbert · 01-10-2006, 05:27 PM

We had an Atlanta area dyno session last Saturday and I still can't determine if these A/F numbers are correct.

mbox did a log and they showed somewhat rich throughout which is somewhat supported here. But the major drop between 3500 and 5000 RPM is what surprises me. It goes very rich but doesn't see to reflect this significantly in the torque. To me the torque curve looks about normal for the modifications and going this rich should have made a noticeable drop in torque.

Anyway, the car as it sits has GIAC X, piggy pipes and Borla exhaust. I was running 100 octane and the dyno seemed to be a bit generous this day. But all in all, there is enough there to get into the 12's...

S4Fish · 01-10-2006, 05:34 PM

scalbert · 01-10-2006, 05:38 PM

As I said, it was a bit generous this day.

Captain Matt, I be · 01-10-2006, 05:39 PM

Ochlockonee · 01-10-2006, 05:41 PM

scalbert · 01-10-2006, 05:44 PM

Just a WBO2 sensor in a mock up pipe in the stream. I also thought it would skew readings as well but it should do it somewhat linearly across the RPM band.

This was a change in a cretain RPM range only. The rest looked to be about where it shoudl be. For reference, my O2 voltages were in the 0.910 VDC range...

siffer · 01-10-2006, 05:49 PM

Ochlockonee · 01-10-2006, 05:51 PM

http://forums.audiworld.com/s4/msgs/1361212.phtml

PSmalls::DoggieStyle · 01-10-2006, 06:27 PM

Ochlockonee · 01-10-2006, 07:05 PM

01-10-2006, 05:27 PM	#1
scalbert Junior Member Account #: 83037 Join Date: Oct 2004 Posts: 774	Dyno Pull Shows Rich We had an Atlanta area dyno session last Saturday and I still can't determine if these A/F numbers are correct. mbox did a log and they showed somewhat rich throughout which is somewhat supported here. But the major drop between 3500 and 5000 RPM is what surprises me. It goes very rich but doesn't see to reflect this significantly in the torque. To me the torque curve looks about normal for the modifications and going this rich should have made a noticeable drop in torque. Anyway, the car as it sits has GIAC X, piggy pipes and Borla exhaust. I was running 100 octane and the dyno seemed to be a bit generous this day. But all in all, there is enough there to get into the 12's...

01-10-2006, 05:34 PM	#2
S4Fish Junior Member Account #: 94628 Join Date: Jul 2005 Posts: 1,331	those are some damn good numbers for just GIAC X, piggies, and a borla. were u running XR? __________________ -Sold, but not forgotten- 2001 S4, Brilliant Black GIAC X 710n's Evo Intake Neuspeed G2 Exhaust Samco TBB Neuspeed Short Shifter 19" Flik Justice 235/35/19s Bridgestone Potenza RE750's Intrax Springs/Koni Shocks E-Codes AWE Vent Boost Gauge Vast Snub H7 Hyper White Fogs RS4 Grill with painted black trim "street racing is like jacking off, every guy has done it. the ones who say they havent are lying." -Devious18t the new s4: AKA 2001 Corvette z06

01-10-2006, 05:38 PM	#3
scalbert Junior Member Account #: 83037 Join Date: Oct 2004 Posts: 774	Nope, just plain old X... As I said, it was a bit generous this day.

01-10-2006, 05:39 PM	#4
Captain Matt, I be Elder Member Account #: 26545 Join Date: Oct 2001 Posts: 32,092	its a dynojet. __________________ Support Innovation for the B5 Platform - www.autospeedperformance.com www.vastperformance.com B5 S4 Forum Cliff's Notes B5 S4 RNS-E Nav+ Installation

01-10-2006, 05:41 PM	#5
Ochlockonee Member Account #: 72863 Join Date: Mar 2004 Posts: 2,953	Did they use a tailpipe sniffer o2 sensor? The cats will skew things to the rich side. __________________ "No, a flux capacitor is not compatible with a ham sandwich."

01-10-2006, 05:44 PM	#6
scalbert Junior Member Account #: 83037 Join Date: Oct 2004 Posts: 774	Yes, tail pipe sensor but no pump system... Just a WBO2 sensor in a mock up pipe in the stream. I also thought it would skew readings as well but it should do it somewhat linearly across the RPM band. This was a change in a cretain RPM range only. The rest looked to be about where it shoudl be. For reference, my O2 voltages were in the 0.910 VDC range...

01-10-2006, 05:49 PM	#7
siffer Junior Member Account #: 91036 Join Date: Apr 2005 Posts: 605	2nd, always higher.

01-10-2006, 05:51 PM	#8
Ochlockonee Member Account #: 72863 Join Date: Mar 2004 Posts: 2,953	Yep, you're pretty rich. Check out this lambda/02 sensor voltage post---> http://forums.audiworld.com/s4/msgs/1361212.phtml __________________ "No, a flux capacitor is not compatible with a ham sandwich."

01-10-2006, 06:27 PM	#9
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	To the rich side?

01-10-2006, 07:05 PM	#10
Ochlockonee Member Account #: 72863 Join Date: Mar 2004 Posts: 2,953	Yes. The cats tend to combine any loose o2 molecules with carbon or hydrogen. __________________ "No, a flux capacitor is not compatible with a ham sandwich."

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