I think you need to get on a dyno and do a 3rd gear pull to like 6500 and see where she starts falling off. With the cam in your sig, I would expect the powerband a little further up and with that 2.8" on the radix, you may be hurting yourself shifting where the theoretical max HP is at. A larger radix pulley and higher shift points may complement that cam a little better. I make the most of my power from 5300 to 6300 (on the dyno) and my shift points are 6100 (1-2) and 6000 (2-3). My cam is designed for mid-range power.

Locking your converter through your shifts is not a good idea.

I lock mine just after my 2-3 shift (I think it is like 80MPH) and get a bump in boost at that point of like .5psi. I was able to shread a Yank 2600 in 2000 miles by doing this as well. Heavy trucks and 500+RWHP is not a friendly combo for a marginal lock up. All of my 1/4 mile runs not locking the converter yielded a slower trap speed by at least 1MPH and ET by a tenth or two.

Since I feel your powerband may be a little higher, you may benifit with NOT locking your converter allowing your truck to cross the traps at a higher RPM and maybe closer to your power curve. Trial and error my man!

 

i was hopeing you would post on this krambo!!!! i know you have been there/done that. and thanks for the info. i am going to go back to the dyno next week and tune for the meth and crank pulley. i will post my dyno chart up for you to look at. my also locks up at like 80 or so. if i shift it, it lock up as soon as it goes in to 3rd. but if i leave it in drive it goes in to 3rd and then locks.

it feels stronger if i shife it and hold the gears out. so that has left me think i need to move the shift points.

what kind of timeing are you running with the meth? im only at 18* and 7psi and put down 545rwhp and 560TQ. i hope the meth and more timeing will brake 600rwhp.

 

just move up the shift and feels better. putting on the meth and the crank pulley this weekend

 

Just for a bit more clarity...

You shift a couple hundred lower that your peak hp?
I have been shifting a coiuple hundred after peak...and want to try something new.
Here are my graphs with and without the 50 shot..





Any recommendations?

 

Yes, I do. I did numerous logs and adjusted my shift points so that I stay in the area of the dyno curve where most of the power was OVERALL. By doing so I was able to shift earlier and not spin the Radix so much with that 2.8" pulley which kept IAT's in check and still gave me 8.5 - 9psi. I can't remember exactly without pulling up a file however with the PI converter I lost less RPMs after the shift than with the Yank of the same stall. My Yank let loose which resulted in a new PI so maybe the Yank was on its way out anyway. This was interesting to me in that by keeping the same shift points, I was able to stay in the sweet spot better with the PI without extending my shift points to compensate for a larger RPM drop at the shift.

So after a few dozen runs down the track I realized that by locking my converter at the right time in 3rd I can in fact double that time where I am in that max amount of power under the curve. Looking at my logs from a 1/4 mile run, I noticed that I am in 3rd gear more than 1 and 2 combined so by making sure I am floating in that "sweet spot" for the longest time possible in 3rd was advantageous. Running smaller tires got me in 3rd there quicker as well.

This is what worked for me anyway.

Now for 05 Crew, his cam (I feel) makes more power up high. So not to overspin the Radix (increased temps and parasitic drag), a larger Radix pulley and higher shift points should maximize his powerband IMO. Keeping the little pulley on there and winding it to mid 6k's, in theory, will hurt. He just needs to play. I am sure someone can do the physics and math and prove what blower RPM is best but nothing like plain trial and error.

05 Crew, I run 21* of advance for my strip tune, anything more and she gets the "hic-ups" (KR) and scares me. Most I saw on the dyno was 53x.

Trev, where are you shifting at currently? How much RPM drop do you see after each shift?

 

Currently shifting at 6300 across all three gears. My Yank's extensions leave me at ~4500 in third, and then it locks up right after the shift dropping a couple hundred more in the process.

 

i have a 2.8 pulley on there now and im seeing 7psi. when i put the crank pulley on there i am hopeing to see 8-9psi. will that be overspin the blower? just for your info. my truck pulley harder form 90-120 than it does for say 70 to 90. i think the cam is doing that.

hahahah...im just trying to run 7.5s in the 1/8. not run it yet. hope it will do that?