2000SSNB

iTrader: (4)

Hello,

I recently swapped in catted Kooks 1 3/4 LTs. Prior to that
I had shorties, stock cats and y-pipe and the SLP dual dual exhaust system.
I only swapped in the Kooks LTs and the Kooks catted y-pipe, nothing
else changed. Before this change the car was tuned very well, passing
emssions with a lot of margin.

I can now smell the car runs much richer when cold (open loop)
but also richer in closed loop. When logging various data is appears
the Ltrims are a few % on the positive side (in closed loop).

I would like to lean out open loop a bit as well as closed loop.
What would be the best approach for both conditions?
Thanks,
Gert

brad8266

iTrader: (23)

Unplug the MAF and tune your VE table to get the LTFT's where you want them, then plug the MAF in and tune the MAF table to get the LTFT's in. Then tune WOT via the PE rpm table.

Billiumss

iTrader: (11)

DITTO!

You need either HP Tuners or EFI Live and use that with a WB O2.

LT's screw with the O2 switching, they don't get as hot as with stock manifolds.

If you are getting +LTrims, you might have a exhaust leak at the head.

2000SSNB

iTrader: (4)

Thanks,

can the above procedure be done without a O2 WB - I don't have one currently - I do have EFILive 7.3,

Gert

brad8266

iTrader: (23)

tuning WOT is without a wideband is very inaccurate. You can tune closed loop with the narrowbands, just go by fuel trims.