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That's kinda what I was thinking. Most of the gauges I'm finding seem to
from 10 - 35 in hg. I don't know how much boost I'll be using and I'm
wondering if that will be high enough.
You might want to set your priorities first, then you can decide. Ie... if you want to boost primarily to increast BHP at sea level, then you might want to make more boost than what a 35" MAP gauge will tell you. On a standard SL day, 2.5psi of boost will get your MAP gauge to that 35". There are racing guys out there boosting 7-10 psi (or more??) ... that's 44-50" MAP (at SL, standard day). OTOH, if you're taking a conservative approach to boosting that says you'll limit (redline) your MAP to 34", but want to maintain that much MAP up to some critical altitude, then your 35"hg gauge will work just fine. The latter is my intended approach, as I don't want to stress the engine with huge amounts of boost, but I would like to be able to keep the power up until I reach cruise altitude, and turbo-normalizing does that just fine. If I can make 190hp with 1 or 2 psi of boost (2-4"hg), then being able to push 34" at SL will get the job done. The complication is that as you gain altitude the turbocharger has to make more boost in order to maintain that 34" of MAP... at SL it's boosting 2psi. At 10kft it's boosting about 7psi to make the same 34" MAP. This is where choosing the proper turbo pressure map becomes critical. And since you'll have the ability to get 7psi of boost you'll need a way to limit the MAP at SL to your intended 34"hg.. boosting to the whole 7psi at SL gets the SL map up to 44"hg. This is why we use wastegates, pop-off valves, etc, but those are discussions we've had here many times. Just check the archives.
<Marv>
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