<!Just for ****s and giggles> , I plugged in a 428CJ using my setup, and the results are disappointing!

Basically just added the bore/stroke and changed the valves to 2.09/1.65 from 2.02/1.60. Power came up to 428hp(ironically ), and 455ft-lbs. An increase of only 15hp and 28ft-lbs.

Does this sound right to you guys?

 

I don't see those as dissapointing numbers unless you have alot of nice hardware in that motor. What cam, intake and carb specs did you use?

What did they rate a stock 428 CJ for. I figure it was about 350 HP or so...

those numbers look good to me!

 

Stop and think of it this way are trucks, say were dealing with a 390..they were 255HP for the trucks and about 300HP for the cars More compression and a little more cam..not much but a little..for 300HP...then you have the 428 witch was with bigger valve's , a little Higher intake and higher compression, and a little bigger cam..

And they said 335HP to 390HP depending on the carb set up.. You can build a 390 to out run a 428 in a heart beat...But you put the same parts in a 428 and it will be a hands down winner.. Everyone seems to forget, I think Greg can coment on this too, I have more money in the top end than everything in the bottom end..

The trick is Part matching.. Thats why I sold my Ed heads for the 390..and i'am saving for the KC Stage IIs.. there is a BIG ARCE difference!! But because of the stroke with the BBF you can make all kinds of torque!!

Russ

 

Are you using flow data from a stock 428 head or the 428CJ head? Are you just using the standard choices they give you? You have to enter accurate info for the program to be accurate.

 

Hey Sean...I dont know what im doing? but I cant get the dad gum charts into the DD? Thats why there's guys like you that are confuser wizards!!

Thats why I can only work with the basics, but one thing you told me that stuck, was doing the .004" and etc....instead of @ .050....

Russ

 

russ what are you talking about on dd program. An btw the 255hp is for 2bbl while 300 is with a 4bbl. As for accuracy you need head flow data not the default crap. Dyno 2003 says to use seat to seat timing in the manual because its more accurate. And i consider the performer, stock, and rpm manifolds to be dual plane std flow. not high flow and the performer is not a high torque manifold on dd. I ran a simulation where the so called high torque intake gave me an extra 45 ftlbs. Thats bull. Another thing that plays a good roll is dyno2003 is lifter acceleration rate. It has an auto calculater, I was trying to find a cam for a 351c buildup and i ran a lunati cam and imput 4 for lifter accel rate and then used auto calc and it droped into the 2 and performance dropped big time. I did more checking with the user manual and they have a test of 8 or so accel rates and predictions. Most some bracket racing cams have low accel rates to save the valvetrain. And its best the go over all the setting in cam manager. I make sure all the specs jive with each other. Its best to get all the specs you can on your cam for the most accurate simulation. The only real problem i have is that the exhaust upgrades seem pretty generous imo.

 

hey ************* can you list your specs and mods. i want to compare 2000 to 2003 and what not.

 

Whats the Hey ************ Are you adressing me Ford? I could list them if I can ever get them into the DD...as there in seperate folds and I havent yet figured out how to get them into the DD?

 

No, it's my username. I'm not sure I it doesn't come out on quotes.

 

OK, LOL, So Fordever was adressing *************?? I think?

 

Thats weird? it just did it too me?

 

Here's a shot from DD.


Basically it was just the 428 bore/stroke and CJ valve sizes that were used in conjunction with the parts that I have. As for flow data on the heads, I'm assuming the CJ heads won't flow any better then my fully ported 68 390 heads. I also left in the pocket porting. I also assumed 10.5:1 CR.

The 68 428CJ was rated at 335hp. But, unfortunately this was before the SAE standards were used which I heard makes a 15% drop. On a side note, my 71 390 was rated at a whopping 215hp (2bbl), after SAE.

 

Too close to f o r n i f i c a t i o n I guess.

 

Ya your prbably correct on that!! LMAO!!!