buick_lsx

Im getting a nitrous kit to help get my car moving harder off the line, ill only be using it in first gear though.

With my new converter ill be able to footbrake 3k rpm but ill be on a 2-step. Now i know that hitting the rev limiter isnt good with nitrous so was wondering if it was the same for the 2-step?

so would i be able to use the nitrous on the line before even moving, or need to wait untill i let off the brake and 2-step?

JAX04

iTrader: (17)

off the brake would be my assumption.

buick_lsx

on just a nitrous car i would totally agree, but when you hear of people spooling the turbo with nitrous i just figured they were doing it before actually getting going, but ill let others chime in....i just dont want to mess up and do something stupid lol

Uglydog56

Can I ask a dumb question here? Why wouldn't someone just hit the nitrous all the way out the back end? I have seen many people discuss just using it until boost comes up. You still get the 75hp or whatever the whole way through, and it has an intercooling effect. Why wouldn't someone want that extra power the whole time? Please upgrade me!

night ryder

iTrader: (20)

because its one more thing that can fail and cause a blown engine, when really you can just add a lb or 2 of boost and runs the same hp

FasTimeSS

iTrader: (47)

probably retarted hard to tune about like 3k with both power adders going nuts inside

stevegrizzle

nitrous should hit as soon as you let off teh brake.

chuntington101

Yeah use the N2O off the brake.

By the way what setup are you running? have you considered a quick-spool-valve?

Chris.

buick_lsx

ive got a 2003 lq9, only upgrades are pushrods, springs, rod bolts, and ls6 spec cam but on a 112 center

front mount s475 turbo with 1.10 exhaust ar, running a 4l80 and 3.73 gear

prev converter i could get 2.5lbs at 2300rpm foot braking on 2-step

new converter i should be able to foot brake 3k and have a couple more pounds of boost....

on the street boost is instant when already moving but taking off in first gear it doesnt hit hard till around 4500

right now its getting 2.0 60's and i just need to cut that down to around 1.6 to get my et back...12.0 at 123 lol, it has the power just want the et

S197pilot

The main issue with hitting the rev limiter on nitrous is that most ECU rev limiters cut fuel. since a wet nitrous system is putting fuel in with the nitrous nozzle there can be a small amount of nitrous enrichment fuel and no fuel from the injectors. This causes a lean condition which is not desirable. If your 2 step cuts injector pulse, I would not recommend spraying nitrous while on the brake. If your 2 step cuts spark, spraying the nitrous while on the brake can be quite beneficial.

chuntington101

How would having un burnt N2O and extra fuel be benafical? do you think that if the 2step retarded the timing enough, the N2O might be burnt in the exhaust manifold? I guess the extra heat form the N2O would also help spool the turbo?......

Chris.

buick_lsx

ive got the Lnc-002 so it just cuts the spark on the 2-step

but let the discussions continue

darkhorizon

I have been planning on spraying the compressor blade, but only when I go wot (I am foot brake only though, and can only stall to about 2800 on the converter).

S197pilot

Hi Chris, The real benefit is from increased exhaust flow while on the nitrous. I am currently doing this on a non LSX application that has a turbo that is way too big for the displacement I have. I only use a small 35 shot but it cuts my spool time approximately in half.

chuntington101

Awww ok. guess thats the good thing about N2O to help spool. you can just add a little more if you need it! lol.

98Z28CobraKiller

iTrader: (17)

Wow, this thread is all over the place.

Buick, You should not need nitrous to make your combo work. Spooling with nitrous is a way to make an oversized turbo work on an undersized motor. What you need is to figure out your timing, get a looser converter, and/or transbrake.

427

iTrader: (3)

I sprayed nitrous against the brake and it stayed on even with the starting line rev limit on. I was using a small engine with oversized turbo combo. When I originally put the car together I tried using a looser converter, but then it would drive over that converter once the boost came up, so nitrous made the car drive. Ultimately a larger engine or smaller turbo might be better, but funding does not always allow that!

Kurt

buick_lsx

i did just send my converter off to get loosened up a bit...it was susposed to be a 3000 stall (i could foot brake 2300), and now its susposed to be a 3600 stall which im hoping to be able to foot brake to 3000rpm at the line.

with the preivous stall at 2100 on the 2-step it would build 2lbs, and at 2300 it would build 3lbs...so im hoping with another 600rpm ill be able to build atleast 5-6lbs which should help get things going a lil better

and if that doesnt work then the nitrous will just be an easy option, i already have the kit anyways

98Z28CobraKiller

iTrader: (17)

I've heard that spooling with nitrous is very hard on the turbine wheel. Hopefully you can get it working without it.

98Z28CobraKiller

iTrader: (17)

The 2 step works by cutting spark in alternating cylinders so that they fire every OTHER time. Fuel is still being delivered all the time. This causes a controlled backfire as the flame from the combustion ignites the raw fuel in the exhaust manifolds from the last go around. This backfire creates pressure in the hot side and quickly increases turbine speed which is used to make boost. Adding a nitrous fuel mix to the equation just results in a more violent backfire which means more pressure and more turbine speed.