pwrtrip75

iTrader: (8)

On a turbo application, HP Tuners 2 bar SD operating system... what do the front O2's do? Can I leave them out? rears are already long gone and shut off.

MUSTANGBRKR02

iTrader: (91)

Fronts are closed loop. If they are out you will be running 2bar SD OL. Some people do it some don't. Most people who do are usually purpose driven cars. I myself am running 2 bar SD with front 02's.

Sh0wGoAt

^+1

i dont run 02's because i like running leaded race fuel and that kills 02's. but it is a pain in the *** sometimes when the weather starts changing alot as it can not adjust.

pwrtrip75

iTrader: (8)

Reason I ask is my friends BMW we are building, we went through the harness and eliminated all the unneeded wires.... and I think they got eliminated. It would be a pain in the *** to probably rewire them. Just wondering if it will work w/o. Would it just take longer to tune and dial in the VE table? Like you'd have to tune it with each weather change?

darkhorizon

Front o2's I have found are easily fooled by weird cams and non pump gas, so I would ditch them in any case.

The problem is that with SD, your tune is going to be weather effected WAY more than a MAF tune would be, so the front o2's would help if you are going to do a 100% pump gas / stockish cam setup.

maf + no front o2's = awesome

SD + no front o2's = not so much.

maxgee

iTrader: (5)

How about E85 running the front o2s?