th41427

My mods are in my sig and i was wondering how much nitrous is "safe" with this set up? the pistons are forged diamond with 2cc valve reliefs the rods are SCAT H beam. i hear alot about the block only being able to take so much juice. i was just wondering with bottom end being built like it is whats the most shot i could use and also what kind of timing should i run. the spark plugs are tr55 gapped at .035. i will have the microedge controller when i get around to ordering it. before i shoot i will be probably running another fuel system just for the nitrous just to be on the safe side.

TRMIN8R

iTrader: (42)

How much is safe? None. How much should you be able to spray? I'd say 250-300. I have the stock block and crank, diamond pistons and scat rods. I'm hitting mine with 275 out of the hole.

myfast70

iTrader: (38)

You will want to make sure you change out the spark plugs prior to spraying.

white00ta

iTrader: (-1)

I'm running about the same setup as you."look at sig". I'm getting ready to run 200-250 with my setup. I'm sure it would handle 300 but if you want that much power i figure time for a bigger engine. I like nitrous but its so unpredictable all the time. An engine built for boost dialed in right "Seems" to last a whole lot longer then a nitrous motor. I'd call 250 shot for the win and work your way up to it.

th41427

Cool i think i am going to set up first with a 200 shot and go from there i think like you though. if i want much more horsepower than that i need a BIGGER motor. haha. keep me informed how everything works out for you, and the numbers unless you want to keep it on the down low. thanks man

5_02ls1

iTrader: (20)

x2 on plugs tr7s...

wish i had that bottom end im about to do a 200 on a stock bottom end minus arp rod bolts....

Chris@NitroDaves

What pistons are you running? Are they a dedicatefd Nitrous piston or a NA piston?

-Chris

sprydncamd ta

iTrader: (4)

i still have a completly stock bottom end and have been spraying a 250 shot for a while now

LS1 SPEED

iTrader: (22)

in addition to Chris... ( oops )

did your builder set up the motor assuming you would spray later?

ShiznityZ28

iTrader: (11)

Start with 200 and get it right then think about more. to many guys wanna start with a 300 and hurt there stuff before ever getting it down the track right.

suzookiegsxr

Colder plugs for sure, make sure your fuelpump and injectors are up to the task
(I don't think a single walbaro pump will do the job) 300 shot is headgasket popping range, so be prepared.

fstphx

iTrader: (5)

Our setups are very similar... I haven't sprayed mine yet- I am planning about the same as has been posted...
I think the only thing holding me back from going just a little more is going to be the ring gap... Its a little tight for much over 250, from what I am reading now...

Nick@HSW

iTrader: (4)

I agree with the general consensus. With the key word in your post being 'safe' I would get with your engine builder and go over your specs and then proceed from there. Generally speaking most piston manufactures actually rate their pistons lower than what most people assume their rated for so its always important to check first.

Nick

87silverbullet

iTrader: (11)

Is your 250 shot 2-staged or is it progressive? Or do you shoot it all at once?

JIBBBY

Based on my knowledge and experience with nitrous over the past 10 years -

The smaller motors such as 4 cylinders and 6 cylinder motors tend to wear out or fail a bit faster then the V8's that run on nitrous...

Now remember Nitrous when injected is basically a more potent combustable fuel additive, so in effect it jolts the motor when first detonated unlike conventenal standard octane fuels...It is more aggressive on all the engines internal movable parts and drive train for that matter... It simple jolts the motors internals and drive train and hit's hard unlike natural excelleration that is found in turbo's and Superchargers.. That is why it is a better idea to boost your motors rather then to run nitrous... More expensive option unfortunately in most cases...

So in effect I would say any NO shot above 50 is going to take it's toll over time on any GM V8 motor... You may find that your engine will wear out faster then normal when using any nitrous loads of 100 shot or more.. This is my best guess although I am just generalizing on those numbers..

A 50 shot would be an absolute safe output if that answers your question.. A 100 shot you will then begin premature engine wear, 150 greater and faster engine wear, 200 + and you maybe looking at complete engine failure in a relatively short time... That's just my take... Progressive shots are a bit easier on the motors when going big...

firefighting1101

iTrader: (48)

a huge thing is if your pistons were designed for nitrous...piston ring gaps, and the type of ring play a huge part in safety for the amount of nitrous your going to be running. safe would be a 150 or under if you asked me, but if your setup is for nitrous and you have your tune pretty well on then hell shoot a 300 and have at it.

th41427

the pistons that i have are the diamond flat top with 2cc valve reliefs the rings are gapped to 200 shot. thanks for all the input.