project89

iTrader: (1)

it was kinda an impulse buy but i figure at 7 psi it can handle the 150 shot, i mean i did build this thing to take upwards of 25 psi

basically its setup as follows

twin walboro 255's
8.5-1 cr
kb hypers /w plasma moly rings
lightened crank
stock rods arp bolts
42# injectors /w 65 psi base fp
though it is a wet shot so fueling shouldnt be an issue

car makes ruffly 300rwhp at 7 psi +/- a lil bit

u guys think 150 shot would be safe at 7 psi of boost or should i back it off to say 75/100 shot

its an n.o.s. brand nitrous kit if it matters

nixon5

idk about the 150 shot i meen with a turbo a 75 shot will likely add alot more than just 75. If i were you i woul turn the boost way down then hit it with the 75 shot to see how the motor takes it

project89

iTrader: (1)

yeah i know the fact that its turbo increases the shot level just due to the cooling effects but i dont know how much

ill add this though on a 90* night at 7 psi im running like 121* air temps in the traps at the track

brandoz28

iTrader: (1)

I'd say run a 75 or 100 shot first see what happens, then go up. make sure your tune isn't overly rich too, or you'll blow the ring lands right off the top of the pistons

chevymec

iTrader: (5)

I would be leary on anything with those hyper pistons. I would start with a 50 shot first. Most guys Ive seen run just use the nitrous to help the turbo spool up off the line if there is any lag.

project89

iTrader: (1)

yeah im deff going to dial it back to like 50 once the large turbo goes on
right now i have 0 lag with the baby turbo well minimal i should say

i just figured i built this thing for high boost hi hp i figured it could take being sprayed in 2,nd and 3rd with only 7psi of boost on it

its more of a ***** and giggles thing really i bet the thing would run liek a bat out of hell on the boost and 150 shot

curious what would 150 shot do to a mid to low 13 sec car?

brandoz28

iTrader: (1)

usually close to a second. after that its depressing how much more horsepower it takes to go faster should have 9 second LS power by the end of next season though...nitrous is your friend

rtkjadams

iTrader: (2)

With hyper pistons and stock rods you are asking for trouble with a 150 shot on your 3.1 V6 without the turbo.

project89

iTrader: (1)

how do u figure im already making 200 more rwhp then stock the 3.1 generally dyno 95-105 rwhp in factory form.
and gm rates the factory stuff for 400hp and 7k rpms

brandoz28

iTrader: (1)

nitrous is a completely different animal, its an IMMEDIATE 150 horsepower, not gradual like the turbo or NA application. it will try to pound the bearings right out. i would start at a 50 and start going up.

86Z

iTrader: (4)

why not just up the boost?

project89

iTrader: (1)

the current turbo im running wont go all to high,thast and i figured with the nitrous it be a simple tune just install the right jets and go,maybe even go one or 2 larger on the fuel jet

the real reason for the nitrous is for when i go back to the large turbo the car will need a lil motivation off the line.so i figured ahh what the hell while im at low boost on the lil turbo lets have some fun

nixon5

Well with the turbo i think the 35 shot becomes around a 50 shot so if i were you i would always use the next size up on the fuel side then go smaller if its too rich.

brandoz28

iTrader: (1)

rich is not safe. if you're using an NOS system, they already jet rich so leave it alone jet wise. u really need to tune nitrous just like you tune anything else, datalogging with a wideband or reading plugs.

project89

iTrader: (1)

really? everyone has always told me to jet atleast one size up on the fuel side to be sure it safe

i quess my best bet would be to call up n.o.s's tech line and talk to somone over there and see what they say about it when i actually go do install it

but a am deff gonna jet it back down from the 150 shot prolly start with a 75 shot and see how it does

brandoz28

iTrader: (1)

yeah, that would be a good idea, if the motor goes rich, it'll collapse the ring lands, let oil in, cause detonation, and then you've got a big mess.

project89

iTrader: (1)

yeah deff dont want to detonate on hyper pistions.

while ive been dialing in my base tune ive kept my ign timming locked out at 10* so far

tom mornning i am going to the dyno to further tune my car and im gonna go ahead and bring the timming back out to 16-18* total

even at 10* the cars putting down right around 300rwhp +/- a lil bit

my low goal is 325rwhp on 7 psi but depending on how far i can tune this thing im thinking 350 rwhp on 7 psi should be atainable

i have a bunch of grand national guys helping me out with my car and there telling me im prolly down 40-60hp cause of all the timing i have pulled out of the motor