help with air fuel ratio dynograph

[07BlownFoose]

Here is my Dyno sheet. I have no idea on how to read the air fuel ratio. I was told that the.a/f was good. Can anyone confirm?

 

[Chiron]

I'm no expert, but that AFR line looks like complete and utter shit.

 

[stkjock]

Something ain't right there. Way lean then way rich.

 

[BAKnBLK2010]

Whoever told you it looked good was mistaken. Really lean too far into the pull then really rich in the middle and end.

 

[07BlownFoose]

One of my cats is clogged up and maybe both. Could that be an issue for the a/f.

 

[BAKnBLK2010]

One of my cats is clogged up and maybe both. Could that be an issue for the a/f.

YES Get those fuckers off of there ASAP....

 

[Chiron]

One of my cats is clogged up and maybe both. Could that be an issue for the a/f.

Two questions.

1) Who the fuck is tooning your car?

2) Did you and/or your tooner know your cat(s) are shot?

 

[Mystickeith50]

Yeah really man...those cats will grenade ur shit quick. Did you notice any boost spikes.

 

[07BlownFoose]

I haven't noticed any boost spikes. I wasn't aware of the cats until a few months ago. I have the slp xpipe should I just remove the cats and put straight pipes or should I buy a new off road x? Looks like I will need a new tune anyways. But with the cats off my check engine light will stay on. Correct?

 

[klaw]

Take it somewhere else! Seriously.

 

[stkjock]

Aftermarket cats suck. Get rid of them.

 

[Wes06]

I don't even have a sc and I know that is WAY lean for to long.

 

[Chiron]

Let me do you a huge favor. Either go here and send Manuel an email, or PM him on here: http://www.s197forum.com/forum/member.php?u=2580

He's a REAL tuner who won't risk blowing your shit up.

Regarding your cat situation, just get rid of them and have your tuner turn them off. Unless you have inspections in your state, you have no use for cats.

 

[retfr8flyr]

I wouldn't even drive that car, with that tune, if it were me. I can't believe you haven't blown your shit up yet. Do what the others are telling you, get rid of the cats and get with someone that knows how to tune.


Earl

 

[07BlownFoose]

Have you guys ever heard of slp race pipes? Cat delete pipes. Or is it just easier to take it to the local Muffler shop and have the run a straight pipe?

 

[Mike Rousch]

Get rid of the cats ASAP, Then find someone else to tune the car. I would never let a car leave with a/f's looking that way.

 

[konablue11gt]

Lots of vendors here and classifieds to get you set up just don't drive that car with af's like that

 

[Captainstr8edge]

Reading the a/f is easy. The dotted line is where you want the line to be at WOT the solid line is where it is. The higher the line the leaner it is (not safe) the lower the line is the richer it is (safer). Having your a/f above 15 at 4000 rpm is just asking to blow up your engine.

Whether you have a sho put in a straight pipe or you buy an o/r pipe online doesnt really matter, just do it now and dont drive the car until you get a new tune and dont go back to that shop.

 

[wazslow]

Reading the a/f is easy. The dotted line is where you want the line to be at WOT the solid line is where it is. The higher the line the leaner it is (not safe) the lower the line is the richer it is (safer). Having your a/f above 15 at 4000 rpm is just asking to blow up your engine.

Whether you have a sho put in a straight pipe or you buy an o/r pipe online doesnt really matter, just do it now and dont drive the car until you get a new tune and dont go back to that shop.

The dotted line is 13:1, certainly not where I would want my supercharged car to be...

 

[michael.konor]

A quick solution would be to gut your cats. Get yourself a 24" long 3/8" drill bit from Lowes or Home Depot, drill through a bunch a holes through the ceramic parts using the inlet or outlet, and than take a breaker bar and finish breaking up all the pieces.

Keep breaking it up until all the pieces come out and reinstall.

Note: Make sure that you do it in a well ventilated area, wear long sleeves, and a breathing mask of some kind. You don't want to suck that stuff in.