As stated, a quality manual boost tap will hold boost well. The only times I can recall that my boost levels varied, were due to super cold nights, or hot muggy summer days. But that will happen regardless of electric or manual b/c.
If you can afford electronic, it can offer many benefits over manual, mainly:
- Adjustable from inside the cabin (not an issue if you want to set it and forget it)
- You can adjust how violently/hard you want your boost to kick in on WOT. If you're not running higher boost, you won't really notice this anyway.
- Having multiple boost settings. I have 4 on available on my Blitz dual SBC-R. I realistically only use 2 settings: 1) Full boost 1.3 bar that my car was dyno tuned on. 2) 1.1bar daily driving and track abuse so my temps don't rise too quickly. (essentially my right foot becomes my "boost control")
- As Keith mentioned above, reputable boost controllers have a settings to react to boost spikes/over boosting. I have a 1.35 bar warning on mine, which will trigger a warning beeper, and reduce my boost to a reduced amount specified by me (mine drops to 0.9 bar). This is useful for if you're racing, and your eyes/ears aren't paying attention to the warning, it will reduce boost automatically.
- Peak reading. This is a small feature, but one of my most used functions. After a spirited blat of the throttle, you can look back to see what your max boost level was. If it's winter season, and your boost levels creeps up, it's useful to adjust your settings according to your peak.
Bit boring to read, but my 2c
