Boost/Vac level questions

[87Superdupra]

Hey My shit vacs at idle at -20, I was just wondering if thats normal because I am running stock boost. Also I know it's common for Oil Pressure to be low in Supras but today while mine was idleing it was like halfway inbetween 0 and 20.
I think my oversize IC piping(3") is lagging my stock turbo as well. Yes?

 

[hottscennessey]

thats all normal, I'm sure the huge IC piping is robbing your spool tho..

and the oil pressure seems high for idle, it probably just wasnt fully warmed up.

 

[87Superdupra]

No way it was almost at O is what I'm saying, it was halfway to the first slash. But it does idle at like 1100 most of the time

 

[xarewhyayen]

iirc, 22-23 inches of vaccum is about what you should be at with the engine warmed up around 650 rpm range. If you're reading 20, i'd double check all of your vac lines. I usually hold 22-23@idle and ~20psi oil press @ idle... specs say 40 lbs oil pressure around 3k rpm range and as low as 6psi @ idle.

edit: 1100 idle is too high... probably a vac leak somewhere or something

 

[supra90mkiii]

iirc, 22-23 inches of vaccum is about what you should be at with the engine warmed up around 650 rpm range. If you're reading 20, i'd double check all of your vac lines. I usually hold 22-23@idle and ~20psi oil press @ idle... specs say 40 lbs oil pressure around 3k rpm range and as low as 6psi @ idle.

edit: 1100 idle is too high... probably a vac leak somewhere or something

idle should be 20in... while decerlerating, it should be 24-25in.

 

[isnms]

http://www.cygnusx1.net/supra/techtip/vacuum.html

 

[theDon]

everything sounds normal to me here

 

[Superjustin13]

iirc, 22-23 inches of vaccum is about what you should be at with the engine warmed up around 650 rpm range. If you're reading 20, i'd double check all of your vac lines. I usually hold 22-23@idle and ~20psi oil press @ idle... specs say 40 lbs oil pressure around 3k rpm range and as low as 6psi @ idle.

edit: 1100 idle is too high... probably a vac leak somewhere or something

It actually gets as low as 4.3psi at idle, and if it gets lower then that u got some problems.

just a quick corrections

 

[87Superdupra]

It actually gets as low as 4.3psi at idle, and if it gets lower then that u got some problems.

just a quick corrections

Okay thanit seems like everything is normal.

 

[The Reaper]

yea sounds fine to me bro.

mine idles at 1000 cause thats where i want it and at 1000rpm it's pulling 20-21 vac.

 

[antman]

everything seems normal exept for the idle rpm.