Reno_NVFD

iTrader: (2)

I've been an FD owner for about a year and a half and this is also my first rotary and my most extensive project yet, so I am still learning tons but I am also trying to take it slow.

Mods:
Apexi Intake
Stock Intercooler with FEED Elbow and Hard pipes
AEM Water Meth
Apexi ECU Tuned for stock boost and stock injectors
Downpipe
High Flow Cat
RB Dual Cat Back
Fresh Rebuild with a little over 2,000 miles
Greddy Profec B Spec II Boost Controller
Koyo NFlow Radiator

My question is with the commander I see intake air temps some times as high as 60 C. It seems to just heat soak regardless of the outside temp. Here in Reno the outside temp are pretty cool, high this week is 57 F. Now to my questions about IAT.

What temp is to low?
What temp is too high?
Is the sensor heat soaking and thus reading high values, is it reading manifold temp instead of air temp?
What dangers are there to incorrectly reading high? Detonation?

I have read about the IAT a little in the 3rd gen section but I still feel like I dont understand the IAT yet. I have seen the Fast Reacting IAT for sale and wondered if it doesn't heat soak in the stock location.

Vacuum Question

My boost gauge, Defi Racer, reads about 14-16 inhg vacuum at idle, approx 950rpm but my commander says -430mmhg. These reading are different.

Which gauge is more trustworthy/ accurate?

I ask because Im looking to determine engine health of my new rebuild. I did a comp test about two months ago with the piston tester method. The bounces looked even and consistent and the rotors measured 110 psi on both rotors.

How do the vacuum readings and compression test relate and compare? Do the readings support one another?

Are the bounces during the compression test just supposed to be even or are they supposed to bounce up to 110psi each time?

I am using a harbor freight compression tester to measure the compression so I dont know how reliable it is. It is brand new though. I held the valve down and cranked it so I could see the bounces of each face. I understand the 110 just means that was the measurement of the highest face.

misterstyx69

iTrader: (142)

Reno,Not to rag on you but you have plenty of posts to start a thread in the 3rd Gen section.
This Section is manily dedicated for New comers who need info.
Next time,Give the New Guy a chance to get IN and ON the Forum,and get his "sea legs" so he can move into other sections..Ok?Thanks.
Thread approved..for now..

Sgtblue

iTrader: (16)

The 3rd Gen. section would likely yield more opinions, but here's mine....
Vacuum and compression readings seem pretty good. Depending on how fresh the rebuild, they may even improve slightly. As for which vacuum reading is most accurate, I'd probably lean toward the commander. It's resolution is likely better.

The stock IC will heatsoak. It just a matter of being undersized. The stock location of the IAT sensor is on the underside of the upper intake manifold and is subject to heatsoak as well. I'm not a tuner, but that can lead to a lean condition, especially if you suddenly went WOT/full boost while in that state.
The faster reacting IAT sensor is an improvement, but it only can react faster from a heatsoaked state. Many, like myself, have relocated the sensor up-stream and out from under the UIM. Mine is located post-IC/pre-throttle-body. (see below, green-bodied sensor just after the coupler on the left). It's only a two-wire lead.