Wide band guys come in!

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Oct 4, 2007

#1

• Oct 4, 2007

• #1

Ok, so im curious as to what your gauge reads, vs what the dyno reads. My car for instance was showing a 12.0-1 or so A/F adverage on the dyno, but now after I installed my wide band im getting 11.1-11.4 depending on the weather @ WOT.
Low RPM where my GRAPH shows to go near 13-1 and then richening to 12-1 is showing a 10.X-1 A/F LEANING to 11-1 on my gauge. HOWEVER @ idle my gauge reads 14.2-15.6 fluctuating...so adverage of 14.7-15 generally....thats exactly what the dynos wideband read @ idle.

My gauge was free air calibrated as well and based on cruize A/F and idle A/F it seems dead on. So what do you guys think?

Here is my grapgh so you san see what they dyno shows A/F to be.



And this is a rough drawing of basically what im seeing now. (blue)

 

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S

saleen556

New Member

Dec 2, 2003

387

0

0

Hillsboro,OR

Oct 4, 2007

#2

• Oct 4, 2007

• #2

Do you have cats? If the dyno A/F sensor is reading after the cats I was told it would add about 1 point to the A/F reading.

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Oct 5, 2007

#3

• Oct 5, 2007

• #3

Nope O/R X. I hope the other bank isnt super lean...but I will find out next week when the second wideband goes in.

Just weird that this happened .

 

[Twitch]

Member

Mar 30, 2005

168

0

16

Montreal

Oct 6, 2007

#4

• Oct 6, 2007

• #4

Do you have datalogging capabilities? That would help.

 

DBMSTNG

I fantasize about it being BIG!

Founding Member

Apr 23, 2002

2,120

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56

not quite here

Oct 6, 2007

#5

• Oct 6, 2007

• #5

your a/f ratio will almost always be different on the road than on a dyno. the dyno just doesn't have the load that you get when driving on the street. that's why tuning on the street is best. it could also be their O2 sensor not calibrated correctly.

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Oct 7, 2007

#6

• Oct 7, 2007

• #6

Yea maybe the load wasnt very high and the EEC just ran it a bit lean. Well i know for a fact that there really wasnt any load on the car....I never heard a PEEP out of the turbos. All you heard was exhaust (which isnt THAT loud). On the street the turbos come alive and start wistling @ 5PSI or so....you can really hear it.

My wideband has an outlet for datalogging, and I have it placed inside the car....have the cable that goes to it to a lap top....but one problem. I havnt bought a lap top yet LOL.

Im really leaning towards their 02 not being accurate. I was the first person on the dyno in 2 weeks, so who knows. Iv been just running around @ 9.0 PSI....and she is doing fine. I cant believe it, but there is a BIG difference between 9.0PSI and the 9.6PSI I was running before. Apparently these bad boys are just coming in

 

M

mineralgraygt

Member

Jan 4, 2006

187

0

16

nj

Oct 7, 2007

#7

• Oct 7, 2007

• #7

was the wideband they where using a sniffer or did they acutally install on in you bung in the x pipe. i know it would be different if they used a sniffer becuase it alows mor time for the fuel mixture to mix by the time it get out of the tail pipe

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Oct 7, 2007

#8

• Oct 7, 2007

• #8

^Yep it was a sniffer. Maybe thats what it was....I hope

 

d98gt

Founding Member

Mar 14, 2002

4,505

59

204

SE Texas

Oct 8, 2007

#9

• Oct 8, 2007

• #9

You can give me your wideband set up

Actually--is that something that I should look into purchasing? I'm soon to be running a nitrous kit though will be getting dyno'd with the wideband

 

Marks5.0!

Founding Member

Jan 27, 2000

640

2

0

San Antonio, TX

Oct 8, 2007

#10

• Oct 8, 2007

• #10

about half a point difference between the tailpipe sniffer on the dyno and what my wideband reads.

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Oct 9, 2007

#11

• Oct 9, 2007

• #11

^ SO I take it the wideband reads richer than the sniffer?

Most of the pull was 12.0-1...so with me running mid-low 11s, it isnt that far off then. Sweet, thanks guys!

I would D98GT...that way you can tell if your fuel system is getting weak over time, or your N20 fuel solenoid is going bad. You will probably want a 12-1 A/F on the spray....but im no expert with N20

 

Marks5.0!

Founding Member

Jan 27, 2000

640

2

0

San Antonio, TX

Oct 9, 2007

#12

• Oct 9, 2007

• #12

yup my wideband reads 13:1 on the latest tune ive made for it.
wideband on the dyno read 13.4/13.5 the whole run, but ive also got cats on my setup.