Low speed torque and driveability ?

ir3333 said
Cruising around town 1400 -1600 is where i noticed throttle response was lazy.

How do you know it's cause of torque and not say something like overlap ?

ir3333 said
Compare the 256 with the 268. and the 256 wouldn't make as much torque as a stock cam below 2000.

I don't know about that, possibly

I doubt the 256 would give up much it's got slightly more @ fifty duration, less advertised, similar lift, on a 110 lsa which should give better low end torque than 340's lsa.

But yes we don't have any dyno evidence down under 2000 rpm so it's a bit of guess work.

ir3333 said
The graph

To me don't look like these much difference down low

ir3333 said
doesn't show the diifference below that but it is even greater. I did have a stock 340 with the generic replacement
Melling 340 cam at .204 / .214 duration. That thing would pin you in your bucket seat at any low rpm and would break
the tires loose at low speeds as well. 3.23:1 gears

How much torque do you need at 1500-2000 rpm before it's. Not lazy ?

Say there's an amount eg. 300 lbs-ft does that mean a large displacement engine can never be lazy no matter the size the cam ?

Sure it's not the overlap the engine is not like running there?

How long does your car spend under 2000 rpm at full throttle ?

ir3333 said
View attachment 1716233453

View attachment 1716233454

RPM Operating Range:1,000-5,200
Grind Number:XE256H
Cam Type:Hydraulic Flat Tappet
Lifter Style:Hydraulic Flat Tappet
Camshaft Series:Xtreme Energy
Usage:Street/Performance
California Proposition 65:WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Advertised Intake Duration:256
Advertised Exhaust Duration:268
Intake Duration at .050 Inch Lift:212
Exhaust Duration at .050 Inch Lift:218
Intake Valve Lift:0.447
Exhaust Valve Lift:0.455
Lobe Separation:110

If you look at this 360, @ 2500 the stock 2bbl cam makes about 330 lbs-ft and the xe256h & xe268h makes about 380 & 370 lbs-ft respectively a good 40-50 lbs-ft over stock cam, at 2000 rpm the stock 2bbl cam is still about 330 lbs-ft, the other aren't dyno'd down there so it's a guess but the dyno graph you provided didn't drop off there so I'd it safe to guess there still a positive gain possibly not.

I could be wrong and it's all about the torque especially since we got to guesstimate and piece together what's happening down there but I not seeing any overwhelming evidence saying so.

Graph starts at 9:45