12.5 volts wot and low o2 readings

[deleonl]

Made two test past today with the new power logger. Not exactly sure what to be looking for but from what I have read 12.5 volts at wot is considered a little low and my o2s seem way low as well. Can someone take a look at my two logs. Test 1 between frames 3800-4100 and test 2 between 800-960. I can list mods if that will help, thanks.

 

[Chuck Leeper]

I can list mods if that will help, thanks.

Pretty much a necessity......

 

[deleonl]

Yeah, I figured as much. Thanks

List of mods:

T66 BB turbo

Stock heads port/polish

1.6 rollers

Roller cam 212/212

60’s with a 93 TT chip

No Alky

Stock fuel pump with an integrated second pump (Bosch) and hotwire kit

MAF translator

3inch T/R cold air kit

3inch SS exhaust with test pipe

3inch downpipe with external waste gate

70mm TB

PTE FMIC

Dual radiator fans

Brain Hofer stage II trans

Precision 3400 multi-disk L/U

Ridetech single adjustable in four corners

H&R rear sway bar


I’m not crazy about the dual fuel pump set up. It seems that I am getting a close 1-1. However, it also appears to bounce around a lot, not sure, if that is normal. I do not have a mechanical fuel pressure gauge on the window; I am running my fuel readings from a transducer attached to the power logger.

 

[Chuck Leeper]

I’m not crazy about the dual fuel pump set up.

I'd ditch that set up, and get a good, in tank unit.
IMO, the Bosch is having to pull thru the stock pump. Not good. That stocker was ?? when new.
Volts at the pump??

 

[deleonl]

Thanks Chuck, yes I plan soon to get a better fuel set up. What do think about the two pulls that are posted.

 

[Eric Stage I]

Looks like you have a wideband connected, what kind is it? Also, what kind of fuel transducer? Need that info so we can read it correctly on powerlogger.

 

[deleonl]

The wide band is an mc1 by inovated and the transducer is one of Julio's kit the plug and play.

 

[Eric Stage I]

According to the wideband, it's quite rich, until the boost creeps up to 18psi.

I would replace your stock narrowband sensor, which might help give you more normal readings. But in general, when you have a wideband, we pay attention to that more.

I would work on the boost control to get more stable boost.

 

[deleonl]

Thanks Eric. How would you recommend I work on boost control? Different waste gate?

 

[The Radius Kid]

12.5 volts at WOT?
Get Casper's field fix harness for the alternator and go from there.

 

[deleonl]

That is a good idea, will do.