how are yall doing, i just bought a stealth ram intake and want to put a new motor together and want to use spray
ive got the intake, 190 cc afr heads and an lt4 hot cam kit which im not sure if it would be too agressive if i spray 150shot? if so what cam do you recommend i love lopey engines.!

also what kind or pistons do you recommed for my motor? forged flat tops? 9.6-1 compression ?

should i get forged connecting rods?

those are the questions ive got right now its my first engine built and i want to match everything at once and get the most power out of my motor. thanks for the advice

 

nitrous loves compression, if you're not planning on running a turbo also I'd push it up to 11 or 11.5.

You wont need forged rods unless your going to be pushing 450-500hp, but it's always a nice idea to get them incase you want to change out a combo and also just for ease of mind.

As for pistons, gotta go forged, Ross makes nice ones for mild nitrous use, JE's are always a good option, but in my opinion some SRPs will work just fine for 150 shot.

As for a cam, look around for some nitrous cams, comp cams makes them I know but all cam companies have their own preferrence.


As long as you're building the motor though, why not save up a little more, go with JE nitrous pistons, some H beam rods, and spray more.

 

thanks for the advice. does anybody have a nitrous hsr motor running? id like to see how much hp it makes and how about 1/4 times. im hoping to be on the high 300's + the power adder do you guys think i would be able to run high 11's ? thats what im shooting for. any help would be appretiate it!

 

well you gotta look at it like this, the engine will be a n/a motor 95% of the time, it would probably benefit you more to get a regular dyno tune on motor then try the nitrous to see the differnce, of course both on the dyno.... if you see detonation on the dyno 9 out of 10 times they will pull timing out, so it will not be good just for motor....

comps xfi line seems to be a good line of cams, made for fuel injection with wider lsa's would be right up the alley of nitrous or boost...

as far as compression? i remember a few years ago on here the census was lower compression and raise the shot up... maybe i am wrong but nitrous basically does the same as a supercharger, it adds more air into the engine.... i would go with a 9:1 up, i had a 150 shot on the old stock 350 tpi engine and the cast pistons looked fine when i dissasembled, cant say much for the no 1 rod bearing though.....

anyway, good luck with the build!

 

You can check my sig for more but I run a stock block, crank, rod and head L98 (350). Cast flat tops, 9.7ish cr, ported heads, headers and HSR. Oh and a 200 wet shot! My cam is a fairly mild CC XFI 212/218 112' roller. With T5 and 3.27 gears it has excellent street manors and is a great daily driver with cruise and A/C. I havn't had it dyno'd since the last build but it runs 7.98 1/8 mi @ 93+ mph. That should work out to somewhere in the mid 12's 1/4 mi. Probably around 500HP on the juice.

 

so can i spray on a 383 hsr lt4 cammed motor? how much? thanks

 

I say absolutly! How much? Well that really depends on what you're comfortable with. I ran a 200 shot with a stock rod, cast piston motor. Some would say I crazy but I have not had any problems. But at the same time I backed her down to 150 for "everyday" use. 200 was for bragging rights and personally I feel it may be pushing it. But let me tell you 200 makes it get really big! I use the Cold Fusion brand system and that's a RWHP figure. It's like a 250hp at the crank. Yes, I'm living on the edge at that level.

Basically, you build a "nitrous" motor the same way you'd build any motor. If you setup makes 350hp for example and you spray another 200hp, then you build a bottom end to handle 550hp. Forged crank, aftermarket rods (or good "factory" rods with prep and good bolts) forged pistons and meticulous prep and assembly are all good ideas for a high hp motor. Whether you run nitrous or not.

Not exactly sure on the "hot cam" specs but I don't think it would be too much. Especially for a 383. Just be prepared to buy a lot of tanks at first. It's a nasty habit!

 

218/ 228, Lift .492/ .492 w 1.5's
It's a mild upgrade for a stock 350; a 383 could run much bigger

 

so what cam would you recommend for me? whats the biggest cam i can run on a forged 383 with afr heads 3.5" exhaust and all bolt ons + 200 shot

 

I agree. 225 intake and 230 exhaust would still be very streetable on a 383 IMO. Correct me if I'm wrong but I don't believe that the cam specs really need to be tailored to nitrous at the 200 hp level. It just means you can run a street friendly cam and still make big power.

 

i have a AFR 195 headed HSR 383 with a 230/245 cam on a 109 lsa. Designed mainly for n/a but with intent to spray. Cam grinder says it will LOVE the spray so i will hit it with a 150 shot and maybe up that to 200 down the road

But for now its n/a. 11 to 1 compression. its running 11.6's at 116 with a rough street tune and 75% launch. Car rides out well and i cant wait to see the numbers on spray. motor is very streetable and driveable. Maybe not the best mileage but its a 11 second car Mileage wasnt my intentions

For an off the shelf grind, the cc306 is hard to beat for nitrous. My cam is similar but with loads more lift and tighter lsa. but comps nitrous grinds arent bad either.

 

Ive heard sound clips of the cc306 and i like it but this cam has to be run on 11.1 compression motors isnt that a little high for nitrous? also i need a bigger stall converter the one i have right now is a 2800 with 3.73 gears and built 700r4

 

nope as long as you pull timing and run good gas with colder plugs, 11 to 1 wont hurt a thing with a 150-200 shot

just watch your tune

And the cc306 is fine on 11 to 1. Mine is going good so far, and i'm pretty close to CC306 specs

your 2800 stall may turn into a 3200 on a 150-200 shot off the line. when sizing a converter you must tell them you plan to spray as more instant torque off the line will stall the converter higher

 

heres a pic of my hsr and thanks for the help