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where closest to turbo to install boost guage line

warpz0r

By warpz0r,
in Engines & Forced Induction

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warpz0r Proficient

warpz0r

Posted
Posted

hi all

since the rb20det turbo is weak and cannot go above 13psi, where closest to the turbo would you put in a boost guage?

theres no point in putting one off the plenum as it will read less up there than down near the turbo...

any photos will be helpful

thanks

Bobjones Mentor

Bobjones

Posted
Posted
Pretty hard to get an engine to idle without vaccum

Unless it is a turbo diesel...hehehehe

Yes near the plenum is where most install them, I recently installed two, one near the turbo and one near the plenum, this was to show boost at the turbo and what was lost through different coolers

Oosh Veteran

Oosh

Posted
Posted
hi all

since the rb20det turbo is weak and cannot go above 13psi, where closest to the turbo would you put in a boost guage?

theres no point in putting one off the plenum as it will read less up there than down near the turbo...

any photos will be helpful

thanks

Why'd you want it READ higher, the actual boost your engine see's won't change any, is it so you can look like you're running more boost?

If so get a tyre valve, attach it to you boost gauge line, then go to the servo and pump as much "boost" as you like in to your gauge.

"Hey look fellas, 20PSI and it's not even running!"

Please take the above post in the light-hearted, fun-poking, way it was intended. :rofl:

Edit: Oh and if you do go ahead with the install, why not try to T from the line running to the wastegate actuator, i believe that sources its pressure "signal" from pretty close to the turbo?

Sydneykid Grand Master

Sydneykid

Posted
Posted

pe1818.jpg

This isn't an RB20DET turbo, but its a good picture to show the pipe work (hose) that links from the compressor cover to the wastegate actuator. If you want to read boost at the turbo then T into this line.:rofl:

burkey22 Community Regular

burkey22

Posted
Posted

Edit: Oh and if you do go ahead with the install, why not try to T from the line running to the wastegate actuator, i believe that sources its pressure "signal" from pretty close to the turbo?

That's what I did. Appears to be working fine.

warpz0r Proficient

warpz0r

Posted
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so that black line on the right side is where i want to install my boost guage too?

0osh - it is so i can accurately read boost from its closest source as to not blow the turbo by overboosting it.

if i read 10psi at the plenum, i might be losing 2psi through all the piping and the intercooler thus the turbo is at 12psi... so its so i get a accurate reading

not to be a ricer ghey boy...

GTR-Ben Proficient

GTR-Ben

Posted
Posted
pe1818.jpg  

This isn't an RB20DET turbo, but its a good picture to show the pipe work (hose) that links from the compressor cover to the wastegate actuator.  If you want to read boost at the turbo then T into this line.:)

Problem is most later model stock turbo's with boost control solenoids don't have the fitting on the turbo housing.. which can be a pain.

I ususally make a custom fitting up and weld it into a stock pipe.

Oosh Veteran

Oosh

Posted
Posted
will it matter if i extend that line a little and make it longer so i can fit the boost guage T aswell as the Boost Controller T on it?

If the hose is too long it will, the longer the hose the slower the response to a boost change, the hosing expands, and with a greater volume of air inside it, dampening the change.

So don't make it too long as your wastegate actuator will take longer to react, and might result in more boost spikes, which kinda defeats your purpose as i understand it.

Bobjones Mentor

Bobjones

Posted
Posted
how did u install it near the turbo?

got any pics of it?

We welded in a vaccum hose connection just after the silicone hose and clamp near the turbo (ie on the cooler piping), this was done on an Evo and I do not have pics sorry...

Alot of racers do this to pic up boost leaks or damaged cores.

Oosh Veteran

Oosh

Posted
Posted
Alot of racers do this to pic up boost leaks or damaged cores.

That i can understand, but you'd be better off with a pressure differential gauge, plump the base signal in as close to the turbo as possible, and the other at the same spot as your regular boost gauge.

Then more than a couple PSI drop registering and you know you've got probs. Beats having 2 gauges and doing the mental arithmetic while trying to pilot a car at high speed!

Yes i know technically a regular boost gauge is differential, with the base pressure being the atmosphere, but you can't (easily) change it.

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