Dyno guesses?

[JasonQuartermile]

Ok so it will be a wek or two before I actually hit the chassis dyno, but I thought I'd throw my combination out there and see what everybody thinks.....

355 cid
steel crank
BME aluminum rods
12:1 compression
255-ish @ .050 solid cam, .560 lift
Dart 230cc heads flowed 286/189
Victor Jr Intake
750 carb
MSD ignition
Hooker Super Comp headers
Borla 3.5-inch mufflers

It's kind of thrown together, I really need a bigger cam and carb for the heads I have, but hey, the engine was cheap. I figure it should be 450-500 on engine, but the TH400 trans and 4500rpm stall converter will probably soak up a lot of that. I'm thinking 360rwhp or so? Think I'm ballpark? It's a nitrous motor anyhow so I doubt I'll see real good numbers on motor....I'm just curious.

[Shawn Anderson]

Re: Dyno guesses?

I will guess, 350 at the wheels if its a mustang dyno and 380 if its a dyno jet

[tiresmoke!]

Re: Dyno guesses?

370

[shaun callaway]

Re: Dyno guesses?

ok i will bite on this one

315-330

sorry im a low baller hope it higher

[min301]

Re: Dyno guesses?

Should make about 440 at the crank, 360 at the wheels.

[fahrenschnell]

Re: Dyno guesses?

300 at the wheels.....I am going to guess low that way you don't get disappointed.

Seth

[Screaming Detroit]

Re: Dyno guesses?

320

[nosnerd]

Re: Dyno guesses?

(not enuff info but heres my 02):460ish hp...370 hp at wheels on dynojet...converter is too loose for good numbers down low...those are big ports for a 355...



al

[Fordplay0621]

Re: Dyno guesses?

355 wheels

[Memphis]

Re: Dyno guesses?

343 @ teh wheels

[dieselgeek]

Re: Dyno guesses?

Jason, whose dyno are you going to use? Westech?


I'd say, with that converter expect 36-38% loss to the wheels, on a superflow or mustang chassis dynamometer. So I predict:


Mustang/Superflow: 307
Dynojet: 520

-scott

[JasonQuartermile]

Re: Dyno guesses?

Jason, whose dyno are you going to use? Westech?


I'd say, with that converter expect 36-38% loss to the wheels, on a superflow or mustang chassis dynamometer. So I predict:


Mustang/Superflow: 307
Dynojet: 520

-scott

I don't think Dynojets are that far off LOL. The Ford that made 290rwhp on the dyno at Spectre made 287-ish on DC Performance (the viper guys) Dynojet. I'm figuring about 30% losses with the loose converter, but you may be right, it may be more. The same 290rwhp truck did 306 at Westech so yeah they're numbers are always a little higher compared to everyone else. Me, I'm going to DC, since they are only about 5 miles away from my house, and they're pretty cool cats.

[shaun callaway]

Re: Dyno guesses?

Jason, whose dyno are you going to use? Westech?


I'd say, with that converter expect 36-38% loss to the wheels, on a superflow or mustang chassis dynamometer. So I predict:


Mustang/Superflow: 307
Dynojet: 520

-scott

I don't think Dynojets are that far off LOL. The Ford that made 290rwhp on the dyno at Spectre made 287-ish on DC Performance (the viper guys) Dynojet. I'm figuring about 30% losses with the loose converter, but you may be right, it may be more. The same 290rwhp truck did 306 at Westech so yeah they're numbers are always a little higher compared to everyone else. Me, I'm going to DC, since they are only about 5 miles away from my house, and they're pretty cool cats.

The point to the dynojet number was that they are not real world.

For true numbers go to a mustang or a superflow they are real world.

[shaun callaway]

Re: Dyno guesses?

a 30%-38% is about right.

[Caveman]

Re: Dyno guesses?

I'm gonna say 335ish. Here's why:

My friend had practically the exact combo in his 355 drag camino, only with a TH350 and 4.56's... His spit 335 to the rear.
Funny thing is, when the motor was built, the builder put it on his ancient engine dyno, and threw 622 on a 100 shot. THAT dyno was optimistic. The next motor that guy built ate itself when the rockers hit the stud girdle. Turns out that wasn't the only health issue that motor had... go figure.

Oh, and your rear gear, driveshaft weight, and wheel/tire weight will also affect the rwhp.