Attached is a screen from DD2000. I know DD is hardly accurate but how wrong are these numbers? Even if they are 50 - 60 hp/ftlbs off those are still impressive for a bolt on 305.

If anyone cares the valves are smaller on the heads to simulate 5l vortec heads.

Any anyone who is gonna tell me to give up on a 305 can come over with a 350 bottom end and install it for me.

 

desktop dyno can be decieving as far as actual hp peaks but can be useful for seeing differences in cams, carb cfm, etc.
find a couple of proven, dyno'd engine combos and then enter them into dd2000. the difference is usually 50-60hp becuase of the difference between theroetical optimimum hp and the real world hp. I found by choosing hp manifolds and mufflers tends to make the numbers more believable.
you dont gain 50-60 horse going from cast manifolds to open headers like dd200 thinks.
also what you would have to do the heads and valvetrain to take that cam would be fairly costly.

 

I use DD for fun, and to see what kind of gain this cam vs this cam does. I don't look at the peak numbers.

For instance, I ran a setup I had in my '67 C10 pickup. Used the block from my '85 TPI camaro.... and stuck a carb ontop.

Everything I could tell DD I told it.

Said I'd make about 170HP.... Dynoed the truck, made 198RWHP.... DD is only flywheel.

How's that for off?

 

If you want accuracy, use Engine Analyzer 3.0.

 

If you want to take out a second mortgage, get Engine Analyzer.

I have DD2000 and it's actually pretty accurate IF you know how to operate it.

First mistake you made, Cronic, is not reading the instructions. Change the cam selection from roller to hyd. The "Roller Solid or Hyd. Lifters" option should only be used with solid rollers cams, or REALLY aggressive hyd. roller cams.

A good way to get a feel for DD2000 is go to a site like www.chevyhiperformance.com and look at some of the engine combos they've put together. They spend HOURS fine tuning the engine to get the best HP/TQ output they can because it makes them look like they know what they're doing.

By them doing so, it comes closer to "optimum" conditions, which is how DD2000 is set up.

There are many engines they've done that I simulated using DD2000 and was always within 10 HP. I just had to learn how to use the program better.

It won't take you long. The flaws with DD2000 are consistant at least. :sillylol:

 

What are you talking about? It's FREE from www.themustangshop.com .

 

That looks like the numbers you'd see with open headers (as it says in the pic)

With pipes and mufflers, it would be at least 20hp lower.

Those are nice numbers for a 305 though.

 

I must have be thinking of another program.

I'm downloading it now. I let you know how the two compare with the same input.

 

I compared my engine in my '72 Camaro on both programs.

Keeping it apples-to-apples, they came out similar.

DD2000 seemed to favor the low RPMs a little more.

EA is cool because you can enter what losses you'll get from PS pump, water pump, and cooling fan.

Plus you can enter primary diam and length, plus muffler CFM, intake runner length and diam, etc. It's much more thorough.

I'd have to agree that it gives more realistic numbers simply because you can input all that extra info. Plus it's less "hopefull"

Here's a pic of both (DD2000) on the right.

 

i just downloaded engine analyzer.

all i can say is.... damn.

i like it a hell of a lot better than dd2000 already! and i haven't had much of a chance to experiment with it. here's a thought, does anyone have the manual for this program, or know where i'd be able to find it?

 

I downloaded EA3 and the numbers look much more believeable that DD2000. I still think my car is gonna look like that when I get my cash flow going but it is nice to have a more realistic estimation.

 

AJ, from looking at your EA scan, you need a new intake or something to get that thing some air. It is smothering at high RPMs.

 

LAY OFF MAN!!!!!

Just kidding. :sillylol:

I came to the conclusion (with RB's help) that it has either a Magnum 268 or XE268 cam. I don't know yet. I just bought the car last week. It's coming out anyway.

It pulls strong all the way to just under 6000 (not before I tuned it ), so I dunno. It has Vortec heads with a lame Performer (not RPM) intake and 650 DP. It's not really built for upper RPMs anywho.

The worse part is the guy put Rhoads lifters in it. Nasty low RPM tick, and unless you have a healty cam, you actually LOOSE upper RPM power and don't gain much in low RPM torque. Advancing the cam 2-3* would give better results (according to David Vizard).

I'm not going to do anything radical with the car anyway. I live ~20 miles from any civilization, so it'll see the highway a lot. I'd like to be able to make it there and back on one tank-full.

 

Here.

I redid the cam specs. They were off BIG TIME!!

This is with 1-5/8" headers, open exhaust, & no accessories.

So i.e., GROSS HP

BTW, the first pic was with mufflers (650 CFM total flow).