hey guys i have had my hallman mbc installed for awhile now....and i really just kinda set it when i first put it in and turned it down a little because its starting to get a little colder now...and i noticed tonight i got on it...i havent been because its my DD to school on the highway try to conserve as much gas as possible and...i seem to be tapering a lot still....it hits about...23 and then in i think 3rd gear it tapered all the way down to..18? im on a jestr flash but...i shouldnt be tapering that much ? right?

 

Flashing doesn't reduce taper, its a mechanical symptom just as oil pressure rises as you give the the engine more rpm's to play with. Taper is the direct result of your turbo running out of effective airflow and pressure ratios to compete with the air demands of your engine at some given PSI.

If you desire to run a high PSI limit up to redline your going to have to find a turbo that simply will flow that much air to begin with. In addition there are things you can do to the motor which improve the volumetric efficiency of the motor effectively making the taper worse becuase it now needs even more airflow. These can be things like cams, over sized valves, stroker kits, and porting which increase the flow of the motor. More airflow means more power and ultimately means you can seriously out flow the turbo if you leave it stock.

 

well i know its a mechanical issue but...in terms of an intake everyone always says theres no point unless your running alot of power .

 

Well if your asking if your taper is normal yes it is.

An intake would improve the taper since the turbo wont be working at a higher pressure ratio to maintain the boost but its not going to be much.. Plus with most intakes you should get some kind of tune with the increased air and possible distortion of airflow through maf on some intakes *cough* hks *cough* its highly advised.


If you don't want to bother with that then by far a more expensive solution is to get a turbo kit.