Redballboy

How big of a shot could i put into my 87 Iroc 350 TPI without like having a great chance of killing my engine the engine just turned 100k . Thanks a lot guys

bEtUr4dRustang

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Redballboy

heh thanks for the info

88IROC350TPI

200

Cronic3rd

Don't listen to him. 125 is the generally accepted number.

Redballboy

haha thanks 125 sounds about what i thought it could take. Thanks a lot

Battery

How much do you plan on running it. If its like every week for sure then 100 shot should be fine. Will not be a huge difference in performance stepping down a little and probably be quite a bit safer. Not saying you cannot run a 125 shot, your v8 can handle it probably easily, but using 100 for the street and 125 for the track or something is sort of safe insurance.

stevedave454

i agree on the 100 for the street, but i'd say 150 is safe on the track... assuming you have the bigger fuel pump... on the stock fuel pump i wouldnt go over 100... even 100 can be iffy, also use the highest octane fuel you can afford/get your hands on, and get the safety switches (full throttle, fuel/oil pressure cut off) and a bottle pressure gauge mounted on the dash... some magazine did a test awhile back on a junkyard 350 with stock 150,000+ mile internals, and i believe it took like a 380 shot before blowing up, and the only reason it actually blew up it cause they hit the button at idle to purge it, and so it broke some ring lands.... of course a 300 shot would have broken something eventually, but still my point is i wouldn't be afraid of a 150 shot at all, as long as you have enough fuel, and can monitor everything

Battery

I'm not nitrous guru so dont just go by what I say, but I agree with everything in this quote.

Ive seen stock stangs run 200 shots (they also were just wanting to blow them up for an excuse to build a r302 or 351...). With enough fuel, and a good tune, 150 for a v8 really isnt out of the ordinary and I'd put it on a good running daily driver any day of the week.

Cronic3rd

Um stock mustangs come with forged pistons (some of them at least). Not the cast crap chevy uses.

Battery

This was a 95 GT stang with stock Hyper****ty pistons.

Cronic3rd

hypers are actually stronger than forged ones. They just tend to self distruct when detonation is present.

Battery

Yeah, lighter and stronger but if you mess up, you're screwed while sometimes depending on screw up, forged will be 100x better.

xpndbl3

iTrader: (5)

actually with a power adder, cast or forged pistons are recommended over hyper pistons. Cast and forged tend to melt rather than hypers which i believe just crack under failure. There was a long post about this in a previous thread but it went into great detail and my speed shop agrees with everything that was said, and they're the largest shop in chicago.

88Camaro350

I am going to run a 75-100 shot on mine soon. However I know a guy with a stock l98 who runs a 150 shot on his. He hasn't even used a bottle yet so I couldn't confirm the longlivity or his internals. We will have to see.

fun Pain

i have about 12 bottle ran through my totally stock L-98 at 150shot, almost 90,000 miles and i even had two backfires, hit it just under 3000, (both at the track trying to take some awd dsm's).... other then that it has all been very very fun...and the motor is as close to stock as possible...

83 Crossfire TA

iTrader: (2)

It’s not that they melt, but that they can deform some when pushed hard. Especially forged pistons. I’ve seen forged pistons come out of engines that got pushed hard that looked almost like someone just took and pounded on them with a hammer, but the engine was still running fine.

Do the same to a set of hypereutectic pistons and you’ll have lots of little bits of aluminum everywhere. They’re strong, dimensionally stable, but brittle.

As far as how much, I know someone that was running 250hp in 2 stages (100hp off the line and 150 after the 1-2 shift) for 3 years before I lost track of him (in other words, it might still be running it, but I don’t know). I’ve run 175 without any noticeable negative effect on the engine.

88Camaro350

do you think I will be safe with a 100 shot on hyper pistons?

I will be running a 6al box with a 3000-5400rpm switch

Probably drop the timing to 6 degrees base...

83 Crossfire TA

iTrader: (2)

I think that you’re safe running over a 200hp shot as long as you don’t mess up, but if you do mess up even a 50hp shot can hurt the engine, a 200 shot will just do it more dramatically.

88Camaro350

Well I think I will be ok...I have the fuel under control. A holley blue pump, T the main fuel line and run my holley fuel pressure reg to the fuel soleniod and let my mallory control the pressure to the engine. I don't think I should have any fuel problems.