Has anyone ever tried to modify the stock boost gauge to read higher pressures? The pressure sensor itself appears to read up to 15.8psi, assuming 5v is the max output from it and the old 'pressure vs voltage' graph and equations in the diy fcd project is correct. I was thinking of just putting an easy to reach variable resistor in the voltage line, plumbing a temporary mechanical boost gauge in to the cabin, and adjusting until I was happy. But I'd be interested to hear thoughts and experiences from you lot first

 

Why not use a boost guage?

 

ditto, the stock boost gauge has no real markings so it isn't very accurate and hard to see way in that corner anyways.

 

didn't really see a need to fork out money for an ugly extra gauge in my car when there's a perfectly good pressure sensor and dial already there. Likely I'll end up having to get an extra gauge, after thinking about potential non-linearity...

 

Then don't get an ugly gauge, get a nice one instead. The stock gauge has no scale on it, so you'd still be guessing at what the reading was just like you are now.

 

The problem is that the stock boost gauge LAGS.
Even a cheapie mechanical one will respond faster, and with it's better resolution will be more useful.

Boost gauges can be had for $30 and LESS on eBay.

Why bother?


-Ted

 

I've never seen it lag?? Occasionally it leaps wildly about (during sudden pressure changes, not enough damping in the mechanism) but it seems to respond pretty quickly.

Of course I can get a gauge, mounting it and running the vacuum line is more of a pain in the **** than fiddling with a resistor though, for an uglier, more expensive, more functional result

Ok, whats the easiest / best (combine the 2 please ) way to mount a basic aftermarket gauge then?

 

All my aftermarket boost gauges will easily beat the stock boost gauge to zero on sudden throttle inputs.

All my aftermarket boost gauges will also hit max boost levels faster than the stock boost gauge.

I've had...
HKS mechanical
GReddy electric
VDO mechanical

I've worked on cars with...
A'PEXi electric
Defi mechanical
Defi electric
Autometer mechanical
Blitz mechanical

...and they all still respond faster.


-Ted

 

Voltage divider.

http://hyperphysics.phy-astr.gsu.edu...ic/voldiv.html

 

A boost guage is one of the easiest things to install. And like ted stated, the stock one lags. Nowhere near as precise as anyother guage out there. And all the cash you have to fork out is like $15. Which is how much they run on ebay(used).