Ok, the Scangauge II has made one thing abundantly clear, intake air temp
is a problem I need to tend to, to improve the performance of my car (even
though I've only noticed the problem in stop and go driving in 90+ degree
weather, I'm seeing that intake air temps are 20~50 degrees above ambient
air now, with weather in the 70's which results in 90 ~130 degrees! I can't
imagine what a power killer that is in the summer when, to make it even
worse, I'm likely to be running the AC also!
I know that there 100's of thousands of words written about this topic on
Miata.net (trust me, I've read ALLOT of them) however, this group has many
intelligent people and I would like their (YOUR!) input on a few questions
1) Is 10~20 degrees above ambient, a reasonable 'goal' (while at speed)?
2) I have a header (no heat shield), does the muffler tape (thermal wrap) do
much to alleviate under hood temps?
3) Assuming it does, is there a down side?
4) Assuming there is not, how far should the wrap extend, to the lower
'floor' of the engine bay?
5) I believe my best bet is a 'Randal Cowl' type of set up pulling air from
behind the firewall however, I'm trying to minimize my cost for this
improvement and think this might entail buying allot of stuff.
6) I believe my next best bet is to shield the intake (I have a Monsterflow,
cone type that breathes from behind the drivers side headlight), and try to
direct cool air from the front of the car, into this area.
7) While I've been researching this, I've also seen some people installing
thermal protection on the brake and clutch master cylinders, Is this
overkill or 'track day' necessary kind of stuff or might this be a good idea
for everyday use too?
Any / all input appreciated including if you know of a thread on a
particularly good set up (for an NB w/