:driving: Turbo Boost Gauge readings

dudemaaan · 08-28-2009, 10:58 AM

Hg " is vacuum you will see this at idle and off throttle. Anywhere from 14-20"hg, depending on your porting. Positive pressure will start as soon as you step on the gas and the turbo begins spooling. For stock twins you should see 10psi by like 2k rpms with a small dip to 8 psi at 4k rpms and then right back to 10 psi. Single turbos will just depend on their size. Some gauges read in bar, in which case you will have to convert my psi measurements.

nvno1 · 08-28-2009, 11:49 AM

Quote:

Originally Posted by dudemaaan

Hg " is vacuum you will see this at idle and off throttle. Anywhere from 14-20"hg, depending on your porting. Positive pressure will start as soon as you step on the gas and the turbo begins spooling. For stock twins you should see 10psi by like 2k rpms with a small dip to 8 psi at 4k rpms and then right back to 10 psi. Single turbos will just depend on their size. Some gauges read in bar, in which case you will have to convert my psi measurements.

WOW thanks for the prompt response. Well the car is a 87 TII,stock motor, RB downpipe and walbro fuel pump. The gauge reads in PSI, my gauge doesnt go that high. Well she is not on the road yet(no driveshaft right now).

08-28-2009, 10:58 AM	#1
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	Hg " is vacuum you will see this at idle and off throttle. Anywhere from 14-20"hg, depending on your porting. Positive pressure will start as soon as you step on the gas and the turbo begins spooling. For stock twins you should see 10psi by like 2k rpms with a small dip to 8 psi at 4k rpms and then right back to 10 psi. Single turbos will just depend on their size. Some gauges read in bar, in which case you will have to convert my psi measurements. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!