I was wondering is anyone has dyoned their truck with an 8lb pulley. I would like to see the sheet if that is not asking too much. I am considering going back to a 6 if the heat in the upper range is canelling out my gains from the lower rpms.
Thanks
Stan

 

ttt

 

Sorry, i don't have dyno #'s but after going to an 8# lower from a 6# but i can tell you that you will gain a minimum of 2/10ths with the change.

People that have seen little if any rwhp on a dyno when going to pulleys bigger than 6#'s,are not telling the whole story...yes you get a lot more heat and i am sure the blower is way beyond its effeciency point,but never the less,my truck and others have gained between 2-3 tengths[12,50's-12.20's in the same air].....it is called tourqe

I would not run an 8# or bigger pulley on stock rods or if i planned on staying with the stock eaton long term...IMHO

 

Where are the dyno charts? Dynos record real data--it's called torque (HP is just calculated, dynos measure torque). If the charts show substantial increases in torque, your theory will be proved. You seem to be correctly stating that it's not peak values, but area under the curve, which wins races.

We are also in apparent agreement that before-and-after trap speeds (NOT ET's) under controlled conditions (controlled for weather, traction not an issue, etc.) are the best measure of power increases. Did you observe any increase in trap speed? I would be interested in seeing ANY reliable data on the subject.

Thanks,

 

Tim
I'm not going to speak for the rest of these guys, but the last time I was on a dyno, I couldn't start the test until the engine was at or above 3000 rpm. If I tried to start the test at a lower rpm then the truck would just shift into 2nd gear wich dosen't help anything.

In my opinion it would be damn hard to find the difference between a 6 and an 8lb'er on a rear wheel dyno test. Again this is my opinion but at the 3000 rpm mark the 8lb'er would already start loosing some of its advantage.

I haven't tried an 8lb pulley but I do run a 6lb with an interchangeable 2lb upper wich would be close. I haven't got a lot of track time this year but I can tell you that the 6lb pulley by itself got the truck into the 1.6's in the 60', with a 1.693 and when I put on the 2lb upper the truck dropped into the low 1.6's with a 1.621...60'. I can't report on top end mph, cause when the track officials said slow it down.....I did. I can also tell you that my best mph in the 1/8 mile was with a just a 6lb pulley at 92.34 and the et was 7.64, with the 6lb X 2lb it was only 91.97 but the et was 7.475.

I hope this helps and sorry I couldn't provide more info.
Dale

 

Ditto on the 60's as i gained 1/10th or more on average going to an 8# and run mostly low 1.6's.