Mr. Chainsaw

alright, so i put my car together last week. it's stock gsr block, b16head with double coil springs, titanium retainers blah blah blah, and gsr cams. took it to the tuner, i have the 8lbs jrsc crank pulley and he said it's only making 5lbs on the dyno. I really have a hard time believing i am having belt slip issues, i made sure they were tight AND straight. I can't wrap my head around how i'm missing 3lbs of boost. anyone have some input?

Mr. Chainsaw

and fyi, i am using the stock pulley on the nose of the charger, and the jrsc crank pulley, so if i am thinking right, i should be 8lbs, any help would be appreciated, i've tried researching pulley size to boost numbers, but can't find anything with the jrsc pulley, just b20, b18, blah blah blah

david974

how old are you belts? or mileage on these

PrecisionH23a

Get a new belt and tension it.

Mr. Chainsaw

brand spankin new belts

I CRX I

get a boost gauge or borrow one from a friend to measure the boost yourself. also, make sure the map sensor is reading it right, assuming he is reading the boost from the ecu. if the map sensor is not reading the boost correctly then its boom for your motor.

Mr. Chainsaw

well right now its only making 180hp, so 5lbs sounds right

Mr. Chainsaw

got a new boost gauge and its dead on. can't figure this out

91jdmhatchback

could there be a leak at a gasket? or is your by pass valve leaking?

Mr. Chainsaw

nope and nope. mercury is too good to have a leak

91jdmhatchback

what?

MONSTERek4

i tune a complete stock gsr on 5 psi made 208. whp on 102 degrees he is on stock pulleys and map sensor was reading 5 psi! too

91jdmhatchback

i only suggest checking over all gaskets. because when i first turbo'd my dd i had a bad t-body gasket which did not show n/a. after fixing this i gained 3 lbs boost. so you never know.

Mr. Chainsaw

my vac is too good to have a leak. my TB gasket could be leaking its *** off and not affect how much boost i make (supercharged roots style) i'm sitting at 23-24 vac at idle anyway, if i had a leak it wouldn't be anywhere near that.

Mr. Chainsaw

i put the gsr crank pulley on, and i gained .5 - 1 psi

Mr. Chainsaw

fyi. the kid had a 4.2 snout pulley, not the 4.0. so with the Jackson pulley (which is actually a smaller diameter than a stock gsr pulley) I was making less boost. with the GSR pulley it made 6.5 on the dyno and fell off to 6 up high which is normal.