some tune basic questions
Thread Starter
Instructor
Joined: Oct 2005
Posts: 149
Likes: 1
From: MD
some basic tune questions
My 99 FRC is about to get a PCM tune. The tuner uses EFIlive. This won't be a dyno tune.
1) The tuner first instructed me to go to an exhaust shop to have a bung welded in ahead of the catalytic converter so that he can insert his wideband O2 sensor. Is this standard practice?
2) He said that an alternative would be to use the car's own O2 sensors in which case the bung wouldn't be needed. Is this a viable option?
3) He said that he could replace the OS on the PCM with the 2003 OS. I know it's common to replace it with the 2002 OS ... he did that for his car... but have problems been reported with putting 2003 on a 99 chip?
Thanks a lot
1) The tuner first instructed me to go to an exhaust shop to have a bung welded in ahead of the catalytic converter so that he can insert his wideband O2 sensor. Is this standard practice?
2) He said that an alternative would be to use the car's own O2 sensors in which case the bung wouldn't be needed. Is this a viable option?
3) He said that he could replace the OS on the PCM with the 2003 OS. I know it's common to replace it with the 2002 OS ... he did that for his car... but have problems been reported with putting 2003 on a 99 chip?
Thanks a lot
Last edited by starshifter; Feb 6, 2006 at 09:48 PM.
Instructor
Joined: Jul 2004
Posts: 110
Likes: 0
From: Newport News VA
1) Not really a standard practice, but will only cost you a couple extra $.
2) Using option #1 would give you the best all around tune. It is easier, faster, and more precise to tune with a wideband than trying to tune using the stock O2s (fuel trims). He will also be able to nail down your wot tune with the wideband.
Given the two options, I would go with the wideband.
3) Not sure about this one.
2) Using option #1 would give you the best all around tune. It is easier, faster, and more precise to tune with a wideband than trying to tune using the stock O2s (fuel trims). He will also be able to nail down your wot tune with the wideband.
Given the two options, I would go with the wideband.
3) Not sure about this one.
Melting Slicks
Joined: Mar 2003
Posts: 2,744
Likes: 9
From: FL
Cruise-In VI Veteran
Originally Posted by see5
For the purpose of tuning you can change a rear 02 with the wideband then replace.
I have heard of changing the OS, but haven't seen it done before.. Interesting....hmm... Not sure of the benefits, the later (after 2000) OS has a single VE table, maybe thats why he wants to use it..
steve
