nitrous (not noss!) with hyperujunktics

[WhiteFish]

opinions please on whether hyperu****ic pistons could take a 150hp shot in a 350 hp small block, is this a ticking time bomb or should it survive with short bursts?

[FMG CAMARO]

My buddy probably has about 100 1/4 mile passes in his 1990 mustang with 125,000 miles. He uses a 125 shot. He retards the timing with a MSD digital 6 box when he is on the spray. When he swapped his cylinder heads there was no sign of damage to the pistons or cylinder walls. "Spray and Pray"

[shmoov69]

Keep it out of detonation and they will last a long long time. Rattle it once with juice, and they will come from together!

[WhiteFish]

interesting , thanks for the info

[ProdigyCustoms]

Nitrous and Hyperexplosive pistons is Internal Combustion Russian Roulette at it's purest. I have been playing with nitrous since before they put sulfur in it so you cannot stand to inhale it, LOL!

Nitrous in finicky and unreliable at best. 50LBS, 100LBS of bottle pressure can change your tune up big time, And bottle pressure is a bitch to maintain, but if you run a 1050LB tune up and pressure spikes to 1200 in the heat (easy), you are up 10% on mixture. Fuel pressure, especially on low pressure set ups, is critical. On a 6 1/2LB tune up, if pressure is off a half pound, that is about 8% off. And fuel pressure can change for multiple reason like voltage, heat, fuel filter clogging, etc. All this is probably not death in a engine with a decent forged piston (I am not talking a extra thick gas ported nitrous piston), But a decent TRW or SRP. With these they say no more then 250HP, but I routinely run 300+ on these, same Russian Roulette, but not as bad as 100HP on Hypers.

BTW, most guys running 100HP on Hypers are running NOOS not Nitrous. Just ask them!

[WhiteFish]

May have to start saving for that Indy big block I've been dreaming about, keep me ahead of the ricers with their "noss", wings, spoilers, stickers and mufflers, oh and colorful lights all over the place.

[63SW]

Right on Frank , its all about the tune up !

Ive run a 468BBC with hyper Us and never had a problem..
I was set up with 175 shot off the line.
car ran 10.98 in the 1/4 all steel 70 camaro with a 29x9in slick and 4.56 gear.

also run a decent little 406sb and a 2 stage system 1.50 off the line and 250 mid track ..This was stock rods , STOCK Steel CRANK and speedpro forged pistons.
No problems. ( TALK ABOUT RUSSIAN ROULETTE )
I Have had this engine in 4 cars and i still have it and its been really low maintenence ...ready for the next car.

Timming - back off 2 deg for ever 50hp over 100.
For more HP kits like a big shot , or cheater,
A 3 step box to retard timming 2deg off line , another 4deg at mid track when the second stage comes in and another 4 a designated RPM for top end safety.
Run colder plugs , depending on amount of spray as to how cold .

you should run a DEDICATED fuel suply for the Nitrous system rather than t-ing off your main system.
and even with 100hp shot , Better fuel like 105 oct.
I run 112 in my car now .

A fatter tune is ALWAYS going to be safer than LEAN.

I love the spray and havent blown a motor yet.

[WhiteFish]

so just 2 deg. back with a 125 hp shot is enough with 112 octane? but what about 92 octane? back to Russian roullette?

[blown69nova]

I used SRP "4032" pistons with 8psi boost and a bit too much rattle, needless to say, #4 broke like it was made from glass. Those are considered hypereutectic.
Steve

[WhiteFish]

guess I win (or is that lose?) I broke 7 out of 8 with 6 psi.

[MonzaRacer]

My opinion is if you use it keep it at 2 to 3 deg to every 40 hp increase and run her rich to keep the detonation to a minimum.
Also use a progrsive controler dont kmake it a big shot out of the box.
Limit to off below 3500/part throttle, this means only hit iit over 3500 with WOT.
Run at least 3 steps colder plugs and if you can get the proper ranges use the AC Delcos and watch the ground strap for bubbling or pitting (like you got it hot with a blow torch)if they burn more than just the tips your gonna torch the pistons. And if the machinist didjnt set them tight they will crack ,,,preriod.
Lee
AFTERMARKET PERFORMANCE

[crashz28]

thats right on the border line of destruction but if your fuel is right you should be ok

[572SS]

A broke a TRW (#5) on my 454SS when I pulled the wimpy Vortech air cleaner off. The boost went from 7 psi to over 9 psi and it was over!

One run and it was done, it happens that quick! With boost or NOS, lean kills! Just like a sniper, one shot, one kill, if you get it wrong on the lean side!

Al