headporter...........me. Port matched intake and exhaust gaskets, good pocket porting job also. I didn't take a lot of meat out of the runners, just mostly blended what was there to the intake gasket to keep velosity up.

It had to be in the tunning. If was peaking out on cfm or flow, it should flatline instead of fall off of the cliff, right?

Also, right at the end of the first run, the power started to climb back up, but it was too late by then.

I'm also going to put some 410's in the back one day, so that will show more torque which in turn will show more hp. (prob not much though)

Still looking.

D Moss

 

The 224 230 cam should deliver slightly more hp than torque on a 355, about equal torque and hp with a 383. At what rpm are these numbers? Tell us more about your setup - exhaust, throttle body size, rocker ratio etc...

 

the problem could be in the heads, did you get them flowed after you ported them?

my 224/230 and ported heads made peak power at 6200-6300. and i shift at 6500.

jesse

 

4.10's will show LESS power on the dyno...

 

Just curious why you shift past peak.

 

exhaust....mac mid length headers, y pipe to 3" exhaust to dynomax ultraflow muffler.

Throttle body---stock

rocker ratio---1.6

 

Nope. Couldn't find a shop close with a flowbench.

 

The link that I posted has the dyno graph on it.

It is also updated so you can see the pic better, plus there is 2 pics of the car on there now.

Thanks everyone, and keep it comming.

D Moss

p.s. I'll have tunercat files soon.

 

At 300 rpm past peak, your still making a hell of a lot more power then you are right after you shift.

 

why would 4.10's show less power on the dyno, I don't understand rationale behind this!

 

Me either.

I thought that with a gear reduction through the drivetrain, it wouldn't take as much power from the motor to show the same amount of torqe to move the roller.

So if you take the same power from the motor and apply it to a better gear ratio (4:10) it will apply torque to the rollers under the wheels faster than it would with the 3:42's. The rollers move faster under the greater torque output, showing more torque output, which in turn show more horsepower.

This is the reason why rock crawlers and drag cars put such a huge gear ratio under their 4x4's and cars, to get the car moving faster. The faster it moves, the more torque output the vehicle is putting to the wheels.

Right? Correct me if I'm wrong.

Thanks

D Moss

 

I can tell you that the 383 statement is not really true. My car had so much torque that it was unuseable below 3500 rpm without major adjustments for traction, it ran out of breath just below 6000 rpm, making it unable to make good HP .

 

When you dyno, you tell it the gears you have, and it adjusts for that. Rear gears don't change the dyno results, or so I understand. I've never dynoed my car, but that's what I've read.

Dan

 

Actually, power peak means nothing. It's torque that matters. As long as the torque is higher in the current gear, you stay in the current gear as long as possible. You only shift to the next gear if:
a) you run out of RPM
or
b) the torque in the next gear is higher than the current gear

Sorry to stray off topic.

Dan

 

My car pulls like a beast from low rpms up to around 5000 rpms. After this, it still makes power but it is nothing like before.

At first, it'll shove you back in the seat or fry the tires, then as the rpms fly up, you can feel the g force pressure slowly let up off of your body until the next gear change.

My buds cobra, at first you don't feel the hit, but as those rpms come up, the g-force pressure presses you back in that seat. (03 supercharged cobra)

My car is fast, but not as fast as it should be. hidden power is there, and I'll find it.

D Moss