Vacuum at around idle
 

Hi, I think I may have a vacuum leak on my project car.

So the question what is the expected vacuum at and around idle for a 13b turbo?



Thanks,,,

i know that my 89 TII gets about 15 to 16

im sittin at around 12

how many miles are on your motor.. also what guage are you getting your reading from?

I see around 16mm/hg (or whatever) at 1000RPM's and about 11mm/hg at a 700RPM idle. My motor is a street-ported, RA seal'd rebuild with about 17k miles. I've got an Autometer gauge.

Any amount of porting will reduce vacuum at ~750rpm idle. I think I remember reading that 16 mm/Hg is a good indication on a stock motor of healthy seals.

mines is 16" at idle but sometimes goes up to 10"? idk why :(