Tuesday, August 16, 2005 - 01:07 pm, by: Trevor Tai
I recently got myself a boost gauge and tried installing it. I know that the tube coming out of the gauge is meant to be attached to a vacuum tube, preferably cut into the tube feeding into the VSV. But I always get a reading on the gauge from the vacuum tube of just that, VACUUM! not boost. When I rev the engine it, the gauge shows less vacuum but no boost, it is always in the negative.
Troy That's ultra dodgy and poor advice - you should never tap into the fuel pressure regulator or MAP sensor lines - if you blow a hose off the gauge at high boost, you've just leaned out your engine...knock, knock, crunch, bang.
Emanuel Spinola wrote on Tuesday, August 16, 2005 - 02:05 pm:
you should never tap into the fuel pressure regulator or MAP sensor lines - if you blow a hose off the gauge at high boost, you've just leaned out your engine...knock, knock, crunch, bang
That's no exaggeration. Happened to a Supra in the UK recently when a hose popped off the FPR. Big clouds of smoke across all 6 lanes of the motorway, apparently, so I assume it holed a piston or three.
Wednesday, August 17, 2005 - 10:21 am, by: Troy Tappenden
Hmm, That's where I was told to put it, but I can see your point Manny. Where would you advise it be moved to remove the possibility of a problem? I have a drag meet in 3 days, so if that is the case, I really should look at moving it to a safer place?
Wednesday, August 17, 2005 - 11:34 am, by: Trevor Tai
Troy - turbo car...CHECK...!!!
Andrew - when the car is in neutral it shows vacuum, i rev the engine, it shows less vacuum.
in the pic below, which is the correct tube to connect to? the one closest to the firewall coming out of the engine? because I have tried the one next to it going to the VSV.
Friday, August 26, 2005 - 02:42 pm, by: Jeff Wilkins
The vacuum is caused by the pistons going down the bore thus drawing air into the chamber (providing the inlet valve is open of course). Until you have sufficient RPM/exhaust flow/load to cause the turbos to spin bloody quickly they will not be pushing enough air into the inlet manifold to negate this slight vacuum (ie until you have decent revs your car is basically an N/A vehicle, remembering N/A cars NEVER have positive pressure in the inlet manifold).
Tuesday, July 04, 2006 - 03:57 pm, by: Marius Hainal(Torque)
9and 1/2 is not stock , is less than stock...
Mine shows ( completely stock vehicle if you ignore the wheels and now the gauge ) 12 and 1/3 to 12 and 1/2 . But it could be the tolerance of the gauge .
Daniel , yes , cut line no. 2 in the picture above and put in a T piece. I did mine a couple of weeks ago like that and it works fine.
Tuesday, July 04, 2006 - 04:10 pm, by: Marius Hainal(Torque)
I was not trying to offend you kid ; I was just ASSUMING stock is 12 PSI from what I read on this board AND saw on my car ; if my assumption is wrong , I apologise.
Don't get too excited , I was only trying to help.
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