Hey guys. Ive got a 87 Turbo II. Im putting in a new block over the weekend. Right now with my old block that is just ready to die @ idle 700 rpm. I get about 8-9 psi of vacum on my boost gauge. This seems a little low. anyone have a healthy 87 TII that could gimme a good reading ? thanks

 

bumpity

 

I have an Autometer boost gauge and when I'm in vacuum at idle it reads 18 in Hg. When I'm doing 80mph in cruise control it reads 10-12 in Hg.
It only reads psi on the boost side of the gauge.
'90 TII.

 

The lowest I see is 11 the highest I see is 15, on my autometer.

 

700 RPM I see 12 in., 900 I get 18 in.

 

~ 750 rpm used to get 13in-14in

 

thanks guys. Can each car have different readings but still be healthy ? do they change by the types of mods you have ? but all stock engine blocks. like non street ported ect

 

Stock ports - 18" - 20"
Street port - 14" - 16"
BP - 10" - 14"
PP - under 10"



-Ted

 

i get 12 lowest and 15 highest at 720-750rpms. i think i got a vacuum leak somewhere, im gonna see if i can find it this weekend. i used to get a steady 16

 

anywhere between 13-18 should sound right. I usually get around 15.

- Kevin

 

I get 16 inches of vacuum on my ported S5 TII motor, rebuilt about 4 months ago.

My first TII saw 26 inches of vacuum. It also hit fuel cut at 5 psi.

My guess is I had a horrilbly inaccurate gauge, and was surprised b/c VDO normally makes pretty decent stuff. I didn't install it, and the silicone hosing used was pretty shitty, so who knows?