Strange wideband behavior
#1
Strange wideband behavior
I installed a wideband the other day (in my cat-delete pipe) and I think it might be acting strange.
At idle I get a good 14.7, it bounces just a little bit (somewhere around 14.3 to 15.1)
It however goes right to 10.0 when I go wide open (with boost), now I know the car is supposed to run like 9.5:1 stock, but I was tuned by Chris at AMS and its supposed to be at 11.5.
It also seems to be really jumpy. Like sometimes just under minor acceleration with no boost I hit values in the 11 range.
When I installed the latest round of gauges I had the battery disconnected for a period of about 10 hours (overnight) - you can't "lose your tune" by disconnecting the battery for long periods of time can you?
It is a bosch lsu 4.2 sensor, and I think this one cannot read any lower than 10, or any higher than 20 (according to the instructions) so even if I was richer than 10, it would still show 10 I'm assuming.
At idle I get a good 14.7, it bounces just a little bit (somewhere around 14.3 to 15.1)
It however goes right to 10.0 when I go wide open (with boost), now I know the car is supposed to run like 9.5:1 stock, but I was tuned by Chris at AMS and its supposed to be at 11.5.
It also seems to be really jumpy. Like sometimes just under minor acceleration with no boost I hit values in the 11 range.
When I installed the latest round of gauges I had the battery disconnected for a period of about 10 hours (overnight) - you can't "lose your tune" by disconnecting the battery for long periods of time can you?
It is a bosch lsu 4.2 sensor, and I think this one cannot read any lower than 10, or any higher than 20 (according to the instructions) so even if I was richer than 10, it would still show 10 I'm assuming.
Last edited by Jp7; Jul 17, 2008 at 07:15 PM.
#9
The wierdest thing is that I think it is reading much richer than it should be. I don't think the car is running this rich.
If you go wide-open throttle you should see it bounce around the target of 11.5 that AMS tuned me for (I would assume)
I get a solid 10.0, which is the lowest amount that my wideband can even measure, which makes me think the sensor might be actually reading lower than 10 but it wont show any lower because 10.0 is the "floor" (20.0) is the "cieling".
Then after I get off the highway today it jumps around to 11 then to 17 then back to 10 when I'm just barely on the throttle.
I don't think the car is actually running these AFR's. Wouldnt I be able to feel something wrong if it was doing this?
If you go wide-open throttle you should see it bounce around the target of 11.5 that AMS tuned me for (I would assume)
I get a solid 10.0, which is the lowest amount that my wideband can even measure, which makes me think the sensor might be actually reading lower than 10 but it wont show any lower because 10.0 is the "floor" (20.0) is the "cieling".
Then after I get off the highway today it jumps around to 11 then to 17 then back to 10 when I'm just barely on the throttle.
I don't think the car is actually running these AFR's. Wouldnt I be able to feel something wrong if it was doing this?
#13
EvoM Guru
iTrader: (41)
Adding a wideband gauge is the first step toward automotive hypochondria
I'm not a fan of tailpipe sniffers. Every exhaust leak, not to mention the cat if you have one, will contribute to lean readings -- which will result in a rich tune. Last time I was on a dyno with a tailpipe sniffer, the AFRs read 0.5 leaner than they do when using a wideband bung up at the downpipe.
I'm not a fan of tailpipe sniffers. Every exhaust leak, not to mention the cat if you have one, will contribute to lean readings -- which will result in a rich tune. Last time I was on a dyno with a tailpipe sniffer, the AFRs read 0.5 leaner than they do when using a wideband bung up at the downpipe.
#14
Adding a wideband gauge is the first step toward automotive hypochondria
I'm not a fan of tailpipe sniffers. Every exhaust leak, not to mention the cat if you have one, will contribute to lean readings -- which will result in a rich tune. Last time I was on a dyno with a tailpipe sniffer, the AFRs read 0.5 leaner than they do when using a wideband bung up at the downpipe.
I'm not a fan of tailpipe sniffers. Every exhaust leak, not to mention the cat if you have one, will contribute to lean readings -- which will result in a rich tune. Last time I was on a dyno with a tailpipe sniffer, the AFRs read 0.5 leaner than they do when using a wideband bung up at the downpipe.
Oil temp gauge
voltage gauge
wideband (this is how I am seeing this "problem")