hey just installed a wideband and i used the rear o2 bung for the installation i spoke with a guy at the local race shop and he said he has installed them on cars before and after the cat and thought that he never saw a difference in the reading i find this hard to belive because the cat is probaly cleaning the air a little right my #s seem lean at idle 14.7-15 part throttle 14-15 and wot is at about 12.8 at 3000rpm and slowly goes down to a 11.6-11.8 but i did notice theres no kr and timing is being pulled hard from the top end im seeing at most 15*-16* of timing i know of guys running 20*-25* up top is this why i am able to run this lean? or am i not even running lean am i getting a distorted signal from the cat i dont know **** about tuning ive always been a muscle car guy and mechanic but i am new to EFI tunning

 

you don't have the kr set up. if the stage 2 map is what you're running then you are knocking. the cat will skew the reading as well.

 

im running a ZZP custom tune

and what do you mean i dont have the kr set up what does that mean?

 

MAN I NEED TO KNOW MOE ABOUT THIS WIDE BAND
CUZ I WANT TO INSTALL A 2.8 PULLEY AND 60lb INJECTORS

 

do a search man the information is endless

 

I'm just making sure of something...

After 3k RPMs, you're reaching high 11s air/fuel, correct? That's not lean dude.

And Area 47 is right about the cat. You want the sensor to be more upstream so it will be more accurate.

 

at idle 14.7 is right that is considered stoich

 

Correct.

At part throttle, your bypass valve is more than likely open, so theoretically, you have a naturally aspirated vehicle in the sense that you're running your vehicle in vacuum pressure.

 

well it depends how far into part throttle. Because at some point your car should go into open loop and start to go towards the 11.3-12 range for WOT throttle.

 

15-16 degree's seems kinda low in my mind. then again. im goofy and run well over 20 degree's

i assume you're using hpt to log the knock? or are you using a scan gauge?

 

wideband after the cat is stupid.

the whole purpose of a cat is to burn up excess fuel in the exhaust, so naturally its going to skew your readings.


and +1 on the knock sensor, you need to check your PIDs and tables to make sure its reading.
because if its pulling timing like that it sounds very much like knock.

 

He said it was around 3k

 

but 3k doesnt say anything it depends how far you are into the throttle at that point.

 

That is true. I was just stating that he's just giving a Revolution #.

 

oh yeah sorry. Yeah everyone is right though it sounds like a knock issue. I actually am having a slight one right now through third. There are a few spotrs where my car has a good air fuel at wide open but it hic ups while at WOT. we are going to take care of that next weekend. But it seems like its a knock issue at WOT in 3rd for me and the car is trying to help by retarding the timing at those spots

 

no it stays at 14.7 untill past 80% throttle

even under boost at 80% throttle or less its still at 14

 

interesting tune you got there.....

 

yeah and even then it still only goes to 12 maybe 11.8 wot but usually its about 12.5

yeah i think its really low thats why i think they tried to give my inj more room by deleting timing and using less gas therefor no high idc#s

yeah i know i was just using that hole for the moment because the downpipe i have dosent leave me much room before the cat but i will change it just wanted to see/expariment

75% throttle or less rpm dont really matter i was just trying to give info

its defenitly not knock i am using scanforce guage to moniter and aem uego and theres no knock just seems lean for a sc/tc vehicle

 

I'm not trying to be a instagator but isn't that the same tune that's blown up quite a few peoples motors?

 

well it def shouldnt be 14 at 80% throttle i can tell you that.

 

w0rd

 

no no no no no thats intense ZZP is a reputable company there tune for 2.8s is a little freakish though

ive been running this tune for over 6000mi no issues and i run her hard every sat night so it cant be to bad or i would have a subaru by now (no piston #4)

 

above 2 psi the car should be in pe. not 80% throttle. i would love to download that map

 

all canned tunes are a little freakish.

 

whats pe not the yellow stuff right