2nd Gen Non-Engine/Transmission Boost Guage still accurate w/ larger tubing?

[HEMI®Dart]

I got sick of the 1/8" Nylon tubing kinking when I pushed the boost gauge into the pillar mount. Went to home depot and got some 1/4"ID plastic tubing ( like an Ice maker uses) and the compression fittings. Is the gauge still accurate since there is much more air volume getting to the guage with the new line?

 

[Whitmore]

Your psi reading will be the same no problem



cheers, Kevin

 

[illflem]

It will read lower but only if you use very large tubing because air compresses.

I aways push the 1/8'' boost tubing though 1/4'' tubing to protect it from cuts and kinks. If you buy bulk 1/8'' tubing from the auto parts it's easier to work with than the stuff that comes rolled up in a fist size ball. Costs like 10¢/ft.

 

[Thomas]

If the pressure is static the readings will be the same. The meter will be 'sluggish' as the pressure changes, probably not enough to notice.



An eighth-inch barbed fitting and hose will fit inside 3/8 airbrake line.

 

[nickleinonen]

when i put a boost gauge on my tahoe, my vdo boost gauge did not come with any plumbing stuff, so off to home depot i went to get some 1/4"od nylon line and some compression fittings in 1/8 and 1/4 npt and some other fittings to get it done. worked well, but at low idle [hot idle] the boost gauge pointer rattled against the stopper. a snubber got rid of the rattle, but made it so slow to react that i removed it and went back to the rattle. .

 

[BillGotthelf]

Thomas has it correct. The gauge will be slightly slower in reaction to a change in pressure but will read correct. The 1/4" tube has 4 times the volume of the 1/8" tube.