What are the negatives and positives to running wit a mbc? good idea? bad? wats the max boost i can run off stock turbo? let me kno wat u guys think
thanks
i was lookin at hallman boost controllers so i was curious...
own 02 wrx wit catback and bov..

 

good- NONE AT ALL-WASTE OF MONEY

Bad-will run lean major engine damage
- boost higher in higer gears. will cause fuel cut and possibly detonation
-can not boost much over stock on turbo because you would be not using the effect of the intercooler- higher engine combustion temp.

JUST SAVE THE MONEY AND PUT IT TOWARDS ENGINE MANAGEMENT

 

Mnb Is No Good!

 

i put a hallman mbc on my 03, and yes it does creep in 3-5th, my car is almost all stock except hoses and bov. you shouldnt run much more boost than stock, mine would hesitate in 3-5th if i had it too high. its fun to have but i would save my money if i did it over again.

 

mbc Is Not Worth It Man! Will Damage Your Engine If You Don't Know How To Use It

 

IT'S TRUE

 

if you know what you're doing they can be very effective.

i've had one on my car for 40k miles.

good:
rock steady boost control
dead simple design
in my case, in cockpit "boost" **** to set desired levels

bad:
in the wrong/inexperienced hands they can kill your engine in a short time
have a "bad rap" as a result
some attention to part throttle full boost must be paid

stock turbo is known good up to 20psi--again IF YOU KNOW WHAT YOU ARE DOING. i ran that way all last winter. when i pulled it off it was in fine shape... ie no troubling amount of shaft play.

i had a LOT of supporting mods to do this. do not assume you can slap an mbc on a stock car and run 20psi for long. in fact, you won't get further than 200 feet before overboost fuel cut (set for 17-18psi) made you wake up and take notice in a hurry. you need full exhaust, fuel mods, engine management, gauges, *****, brains, etc.

for most intents and purposes, 15psi on a stage 1 (ie no mechanical mods) is safe.
16.5psi with no cats. set max boost in 4th gear. there is no reason you should be flooring your car in 5th gear.

hth
ken

 

i had one by turbo xs. than sold it. really gotta watch the boost gauge would over boost blah blah. the engine managment was way better. the mbc was a waste or 100 bucks