I too am running hyperutectic pistons. My engine is already together and in the car so I'm stuck with them. I just got a Edelbrock plate N2O kit that is adjustable from 50-100 hp. Will I be safe running smaller shots like 50-75-100 as long as I dont lean out? My motor with out the juice is probably making 300 hp & 300 torque.

 

I've ran at least 150hp on stock zz3 hypereutectic pistons. I seem to recall trying 175 too, but the transmission went away at the time.

steve

 

"as long as I don't lean out">>>>>>that's the ticket and one time is all it takes. Just like the ladies say "it was an accident">>>>>>>yeah well, welcome to parenthood.

 

the paper work that came with my KB hyper. pistons state that 500 horse shots have been ran with off the shelf pistons with a Jacobs master mind .when properly set up of course

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86 camaro 405 sm. blk. th 350 tranny 3.42 gears

 

I wouldn't go over 100. And yes, burning rich is the road to success!! I would watch out with hyper. pistons, they were not made for high RPM so keep that in mind. I've seen what 9 lbs of supercharged boost does to those hyper. pistons, nothing nice!

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92 Camaro Z28
350 TPI
Dart Iron Eagle heads
10.5:1 cr
Lunati L54779 cam
52mm throttle body
Ported plenum
Home made AFPR ($2)
1 5/8 shorty headers
Ram air
255 lph Holley fuel pump
2.5 inch TRUE DUAL exhaust (no cats)
Flowmaster mufflers
4.10 gears
700R4 w/2000 stall
100HP nitrous
Best time before any of these mods:
15.1 @ 91.9
Best time after mods:
12.60 @ 108.3
That is at high alt.
5600 feet Morrison, Colorado Bandimere Speedway

 

Well thanks for all the info. I take from all of this that it can handle the power with no problem but if I lean out i'm f*$k#d! I plan to use a low pressure cut off switch so if my fuel pressure drops off so will the N2O. I probably will fry it sooner or later but what better reason to drop on forged pistons, 400 crank, 2.02 dart heads, roller valve train, single plane intake, 750 cfm carb, new cam, 6 speed manual trans, and a JATO rocket! I will make that Darwin Award list!