I was wanting to know what everyone's map readings are at idle. I am most curious about engines that have a cam with a 112 lobe seperation.

 

Its not only lobe sep that affects MAP at idle.......

here are my readings with cc306

https://www.thirdgen.org/techbb2/sho...hreadid=246142

/N.

 

My stocker is in the 30-35kpa in gear at idle.

My hotcammed 350 was around 60kpa(+-5) at idle in gear.

Both of these assume warmed up and a fairly decent tune.

Idle timing also influences this as well as does whether u are rich/lean at an idle and how smooth u get the idle(error corrections and so forth)
later
Jeremy

 

My Vette TPI (355) with stock cam is in the 33-37 kpa in gear at idle at 675 - 700 rpm.
When I put in P or N (the stock chip adds 100 rpm ) is in the 24-26 kpa in gear at idle at 775- 800rpm.
Is it normal that with increased rpm (800 vs 700) the KPa values decreases?
I was thinking that with higher rpm level the throttle(s) was open a bit more, so I was thinking that low vacuum (Hg of mercury) readings was expected. Low vacuum (Hg of mercury) = Higher Kpa values.
...I add... If I rev the engine in N or P up to reach 1,000 or 1,500 rpm I have Higher Kpa values if the TPS is grater of 0% and loooowwwwer (in the 10 kpa range) if the rpm level is high and TPS is 0%.

 

Great, now I don't feel so bad. I usually have a MAP reading of 52-55 at idle with the sig below. So I guess that I am doing alright.