well, i havent loaded it into excel yet since i just did it last night, but what i did notice was it seemed to run richer at part throttle and leaner at WOT.

w/ the screen out my o2s looked like they were staying around .92 - .93, and my ltrims were at around 8-12%

w/ the screen in my o2s looked like they were around .875 - .890, and my ltrims stayed anywhere from 0% - 3%

hmm... looks like i will be "borrowing" the maf off my moms avalanche and replace hers w/ the descreened one hehe <img src="gr_grin.gif" border="0">

bryan

*edited for typo*

[ January 02, 2002: Message edited by: really slow truck ]</p>

 

Thanks Byran for doing the investagative reporting on this. I knew that removing the MAF should have leaned the truck out, but it is nice to have a little proof.

Now where can I get one w/ a screen?

 

Go rent one of those $19.95 U-hauls 4.8L Silverados...They wont know the diffeerence <img src="gr_stretch.gif" border="0">
Small price to pay for a screen...

Richard

 

haha thats a pretty bad *** idea ox <img src="gr_grin.gif" border="0">

 

yeah, but i still dont understand the wot readings, at wot the o2s were running richer w/o the screen. probably just because of the change in the path of the air w/o the screen there to even it out

 

I was thinking of going to a dealer and taking a test drive. <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />

 

Bryan - do the opposite and tap the AV with the screen, then tap it w/o the screen. I would like to know the result.

 

With my screen removed I am running around .94-.95 at WOT. I have it tuned to about .890 when I spray the wet kit. I also have not seen any knock retard or detonation in my truck with 93 octane...which is what I normally use anyway.

 

Excuse me for being new to all of this. But could someone please expain to me what those numbers mean? What are they measuring excactly? What are you using to aquire these measurements? Thanks, Mark

 

Hey Mark. Any OBD II scanning software will work, but Bryan is using Autotap. He is measuring his O2 sensors during wide open throttle runs. Optimum number is somewhere around .89 to .91 These numbers are readings the computer gets from the O2 sensors that tell if too much or too little fuel is being added to the air coming into the motor. Bryan is looking to see if the O2 readings change by removing the screen on the MAF sensor.