BlackMagicC5

iTrader: (2)

With all other conditions being the same, whats a more ideal setup? What would be faster and trap higher?

346ci head/cam 450rwhp + 200 shot = 650rwhp

427ci head/cam 550rwhp + 100 shot = 650rwhp

Basically what I'm asking is whats generally faster, big cubes with small shot or small cubes with big shot. I know its a tough question, but I'd like to see everyones thoughts.

Speed Density

iTrader: (38)

Both are going to perform well if setup right.

Advantages with bigger cubes is you also get the added torque of the setup and you have to run less spray to acheive the goal.

BlackMagicC5

iTrader: (2)

Which setup would you rather have strictly from a performance standpoint?

waterbug1999

iTrader: (3)

427, hands down! You wont be spraying all the time, so N/A with a 427 will still get you in the 10's!

greyghost4x4

iTrader: (10)

^^^Touche!

Joey@Tick

iTrader: (20)

The big cubed car all day long.

There is no replacement for displacement.

john563

iTrader: (17)

Seen your guys car on GMHIGHTech. Great car!!!!!

Sharpe

iTrader: (7)

I think the OP wants to know if one will have a better ET than the other.

I would say the NA car would run a faster time, unless going up against someone spraying off the line. Normally, you spray (in street cars) past, like, 3000 RPM. If he's spraying off the line, then it would be a wash, I suppose.

Just speculation from someone with a stock-like NA car who's never driven a N20 car.

Speed Density

iTrader: (38)

I would run with the 427.

I am in the same place (but with an LT1) I chose big cubes and less spray to reach the goal, whereas with a 355ci or something less of a stroked motor would take more nitrous.

Tony.

chrismorales75

You could set up both motors to make the same rwhp, but the bigger motor will make more torque.

The bigger motor will also have more power potential.

The bigger motor can make the same power at less rpm.

427 is the way to go.

Sluggish

iTrader: (10)

But nitrous is a torque monster, wouldn't the torque from the 200 shot be able to meet the 427's 100 shot or at least get close?

H/C 346 = 450rwhp/ 415ish rwtq

427 = 550rwhp/ 525ish rwtq

My friends H/C s197 with a 100 shot went from 340rwtq to 550rwtq on the dope.

So is a 100 shot is good for about 200rwtq, then a 200 shot would be a little more that 300rwtq?

JoeMama's GTO

iTrader: (3)

Depends at what RPM you start spraying at. As a rule of thumb N20 adds the rated HP at all RPM so spraying in lower RPM will add a boatload of torque and associated cylinder pressure. I think one advantage of the 427 is that you can start the spray at a lower RPM; of course this will depend on alot of other engine variables but in general I think the larger the displacement the safer it is to spray down low.

Black2001z06

iTrader: (32)

Gee, this is a real toss up!

123sugey

I believe the small motor would be faster. the 200 shot of nitrous would put the 427's torque to shame. The bigger shot of nitrous on the small motor would give it more torque and hp throughout the entire rpm range.

BLAKE 01 WS6

iTrader: (1)

the one with the best 60'

shift123

iTrader: (12)

One of the magazines did this with a 355 and 406 a long time ago and the 355won because of torque from bigger nitrous hit. Used same car and drivetrain for the test. Its been about 4 years ago since I read it.

slmdLS1

iTrader: (8)

are you refering to a mustang? stangs will respond different than an f-body with f/i...not to mention that isnt an apples to apples comparison.

Sluggish

iTrader: (10)

Yea, I was just using his car as and example because thats the only person I personally know with before and after dyno numbers.

WheelsUp84z

iTrader: (14)

i would also say go with the 427, the less gas you have to throw at it, the longer it will live. not saying that a motor with a 200 shot cant live a long time, it will just be easier on the bottom end with the 427 and 100 shot.....then agian you can always spray the 427 with the 200 shot too

BLK02WS6

iTrader: (2)

+1 vote for 427 on 200 shot