Fun with troubleshooting leanness (and 5th gear cruising temps) Options

[emerygt350]

So I have been playing with adding resistance to the cht to bump my mixture. Messing with the mps was not getting me to where I wanted to be I wanted something a little more global. Anyway, bought a 10 dollar Bluetooth relay. Set it up so one channel was clean the other had 50ohms resistance in it. As I am driving I can switch back and forth and watch the results on the cht and AFR. 50 is really working well (this is all in addition to my 250ohm found on 73s). Now I have added another 20 ohms to the alternate so the relay will switch between 50 and 70. It ain't pretty but it's only for troubleshooting.

[r_towle]

Somewhere out there online is a doc, drawing and pictures of the aero dynamic testing done by a member many years ago….

I’m recalling a set of tests to measure air going into the engine lid, along with temps with and without the rain tray…lots of good tests.

Tray or not makes no difference.

Side vents, like the Boxster, would probably work great.
I recall getting air into the engine lid was actually harder at higher speeds.

Might be worth a hunt to go find old info on 914 aero dynamics

[era vulgaris]

I’m recalling a set of tests to measure air going into the engine lid, along with temps with and without the rain tray…lots of good tests.

Tray or not makes no difference.

I found this to be the case also. August in North Carolina, generally in the mid 90's with 80-90% humidity. I removed the rain tray and ran two weeks without it just to see if there was any difference. Head and oil temps were exactly the same. Operating temp is operating temp, and has more to do with state of tune as well as whether all the cooling tins are in place.
Over the course of an entire year, through winter and summer, I also saw ambient temps make no difference in head temps, however oil temps were slightly higher in the summer (although not enough to be concerned about) even with a remote oil cooler with thermostatically activated fans.