Can new O2 sensors make your car run leaner/richer?
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Can new O2 sensors make your car run leaner/richer?
O2 change.doc
Sorry , couldnt cut and paste into the post.
Sorry , couldnt cut and paste into the post.
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
Most folks around hear very strongly believe the AC-Delco 3 wire AFS-74 sensor is much better and more accurate than any other brands.....
I use one.
I use one.
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Originally Posted by Steve40th
Attachment 120849
Sorry , couldnt cut and paste into the post.
Sorry , couldnt cut and paste into the post.
Who knows what's been blown across/ thru it, or how old it is?.
Joined: Mar 2000
Posts: 1,692
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From: Corona
Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: BP383 vortech, BP383, 5.7 TPI, LG4
Transmission: 4L60e, 700R4, 700R4..
Axle/Gears: 3.27, 2.73
This is what Steve wrote:
I recently had installed DENSO 3 wire heated O2 sensors in my LT1, replacing the single wire BOSCH sensors that my tune was done on.
The reason I did this is my 93 LT1 has a LT headers and a medium cam, 230/236 XE in a stroker motor.
The tune was very good before, just the idle was burning my eyes because it wouldnt stay in closed loop. The Heated O2's fixed this.
The dyno before was 425 rwhp 428 tq with 12.9 AFR and now with the new O2's its running 14 to 1 AFR!
Also, the second Dyno was different from the original and the Wideband was placed in the tailpipe of the second run (which had lots of balck smoke) while the first dyno was in the bung right after the colector, but no black smoke.
On the road when I floor it it does the basic black smoke puff intially then there isnt any black cloud.
I wouldn't blame the narrowband O2 on the dyno readings, nor would I trust a tailpipe wb.
The puff of black smoke also means your AE calibration is a bit excessive. Got any friends that could loan you a wideband to put in the close mounted bung?
I recently had installed DENSO 3 wire heated O2 sensors in my LT1, replacing the single wire BOSCH sensors that my tune was done on.
The reason I did this is my 93 LT1 has a LT headers and a medium cam, 230/236 XE in a stroker motor.
The tune was very good before, just the idle was burning my eyes because it wouldnt stay in closed loop. The Heated O2's fixed this.
The dyno before was 425 rwhp 428 tq with 12.9 AFR and now with the new O2's its running 14 to 1 AFR!
Also, the second Dyno was different from the original and the Wideband was placed in the tailpipe of the second run (which had lots of balck smoke) while the first dyno was in the bung right after the colector, but no black smoke.
On the road when I floor it it does the basic black smoke puff intially then there isnt any black cloud.
I wouldn't blame the narrowband O2 on the dyno readings, nor would I trust a tailpipe wb.
The puff of black smoke also means your AE calibration is a bit excessive. Got any friends that could loan you a wideband to put in the close mounted bung?
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Originally Posted by RednGold86Z
This is what Steve wrote:
I recently had installed DENSO 3 wire heated O2 sensors in my LT1, replacing the single wire BOSCH sensors that my tune was done on.
The reason I did this is my 93 LT1 has a LT headers and a medium cam, 230/236 XE in a stroker motor.
The tune was very good before, just the idle was burning my eyes because it wouldnt stay in closed loop. The Heated O2's fixed this.
The dyno before was 425 rwhp 428 tq with 12.9 AFR and now with the new O2's its running 14 to 1 AFR!
Also, the second Dyno was different from the original and the Wideband was placed in the tailpipe of the second run (which had lots of balck smoke) while the first dyno was in the bung right after the colector, but no black smoke.
On the road when I floor it it does the basic black smoke puff intially then there isnt any black cloud.
I wouldn't blame the narrowband O2 on the dyno readings, nor would I trust a tailpipe wb.
The puff of black smoke also means your AE calibration is a bit excessive. Got any friends that could loan you a wideband to put in the close mounted bung?
I recently had installed DENSO 3 wire heated O2 sensors in my LT1, replacing the single wire BOSCH sensors that my tune was done on.
The reason I did this is my 93 LT1 has a LT headers and a medium cam, 230/236 XE in a stroker motor.
The tune was very good before, just the idle was burning my eyes because it wouldnt stay in closed loop. The Heated O2's fixed this.
The dyno before was 425 rwhp 428 tq with 12.9 AFR and now with the new O2's its running 14 to 1 AFR!
Also, the second Dyno was different from the original and the Wideband was placed in the tailpipe of the second run (which had lots of balck smoke) while the first dyno was in the bung right after the colector, but no black smoke.
On the road when I floor it it does the basic black smoke puff intially then there isnt any black cloud.
I wouldn't blame the narrowband O2 on the dyno readings, nor would I trust a tailpipe wb.
The puff of black smoke also means your AE calibration is a bit excessive. Got any friends that could loan you a wideband to put in the close mounted bung?
Thread Starter
Member
Joined: May 2006
Posts: 159
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On this link are my dyno AFR graphs
Steves dyno and these are with heated O2's and DELTEQ, and the videos are from other cars there.
here is my old dyno graph across town.
Steves dyno and these are with heated O2's and DELTEQ, and the videos are from other cars there.
here is my old dyno graph across town.
Last edited by Steve40th; Jun 28, 2006 at 09:28 AM.
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