I just put a 94 LS TB (60mm) on my boosted Z6... The idle readings went VERY rich (10:1), but the boost portion of the map seems fine. No leaks, nothing like that. What would cause the lower portion of the maps to richen up other then a loss of vac (changes map reading at idle)? Vac still holds strong at 21 at idle...

 

what r u tuning with? sounds like the tune is off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by abnaasefmb &raquo;</TD></TR><TR><TD CLASS="quote">what r u tuning with? sounds like the tune is off.</TD></TR></TABLE>

Crome Pro. Tune was dead on before I added this TB. Idled fine at 14.7:1.

 

well i dont know about swapping throttlebodies but you should just be able to adjust your low cam map and be good.

i once had an exhuast cam a degree or two off. when i noticed it and fixed it i had to tottlly redo my whole map. it funny how much one thing can effect your tune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by abnaasefmb &raquo;</TD></TR><TR><TD CLASS="quote">well i dont know about swapping throttlebodies but you should just be able to adjust your low cam map and be good.

i once had an exhuast cam a degree or two off. when i noticed it and fixed it i had to tottlly redo my whole map. it funny how much one thing can effect your tune. </TD></TR></TABLE>

No, see... I know HOW to correct the problem, I am asking if this is a common thing to see from a larger TB? I've never messed with larger TB other then stock and to see the readings richen up this much had me a little shocked...

 

yeah, i don't know. seems funny

 

Did you have to swap over the TPS or is it the one that was OEM attached to the TB?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jaker &raquo;</TD></TR><TR><TD CLASS="quote">Did you have to swap over the TPS or is it the one that was OEM attached to the TB?</TD></TR></TABLE>

One attached to the stock LS TB. Didn't swap.

 

Found the problem. Oring for the map sensor was missing. It was creating a pretty large vac leak. Even though the gauge still showed 21" at idle... I could cover up the whole tb and the car would still idle. Anyways, oring is in, problem is solved.