anyone using just one cat and what kind? after my mufflex y-pipe not much room to put a cat; it will be very close to driveshaft.Input appriecated.



Rob.

 

I am using two of the larger stock 94 cats on mine. I had a custom Y made. I would advise against them. Mine are comming off shortly, only put them on to pass emissions, which i did.

Alse, wiht them on the car just dumps fuel into the engine. MY 02s were reading over 1.000. At WOT, i am taking out 20% fuel from my stock program, yuck.

 

should I tell Bryan @ PCMforless Iam going to use a cat before I have my pcm tuned?

 

YES!!!! Tell bryan about the cats

If you want, you can use my set up as base.
My custom program is following
Tell him dual cat,
i have 2 cats
at WOT,
at Wide open throttle, 100% gas
i took out 20% from stock tables
I took out 20% of my fuel from my stock program
from 2800-6k.
took out the 20% in the rpm range
o2s are pretty constant,
o2 sensors give a rough idea of A/F
but split at 890ish, and 950ish after tune.
These are what my 02s were reading, after the tune, on both banks, (left and right side of the car) Still a little on the rich side, but good for me for now.

BLMs are stock settings.
this gives an idea of your fuel table when you are just cruising around. Computer aims for 128 (i think)

That shoud give him a good baseline, but he might have his own formulaJust saying that bryan may/may not be able to use this info for his/your own good in your program


Jared

 

sorry don't know what you just said.

 

i edited my post above, old post in balck, new in red, hope that helps some more