Changed pulleys and made a couple of pulls the other day.

Baseline: 231HP 275FT-LBS with 245/70/R16s
Radix @ 6/7#s: 306HP 350FT-LBS with 295/65/R17s
Radix @ 9/10#s: 335HP 380FT-LBS with 295/65/R17s



We made alot of pulls after the pulley change and I was up to this point before we got heat soaked. Actually went down in HP towards the end with seeing 10 lbs of boost becasue of the heat. Added some timing and gained power back even with the IATs up so I figure I would be above this had it been cooler.

On the street boost start at 7# and then builds steadily till 9#s Haven't seen 10#s on the street but the dyno operator to me we were hitting 10 # by the end. Anyone know what this would be caused by?

Still not where I want to be in terms of power but the truck has 75000 miles, 33" tires, clutch fan and 4LE80. Figured my gains are about 10HP/10FTLBS per # of boost. Looking to do some more mods to improve my power.

 

what kind of truck was this on? Maybe I'm smoking crack but those numbers don't seem too impressive for 10lbs of boost.

EDIT- IF it was on that 6.0 then those numbers should be WAAY higher IMO. Who tuned the truck?

 

What cam are you running?

 

Yep. 6.0L. I started out low on power and I've gone round and round with why I don't make the power other do.

I still have the stock cam.

 

somethings not right. i put down 320 w/ a radix 5.3 stock cam in a 4wd w/ 35's.

 

whats the timing curve look like? i can see the 80e killing some power but should be higher. what kind of dyno?

 

oh wow...

My 6.0 made 330 rwhp with an M90 magna on it @ 1.5 psi

you should be WAYYYY higher....

~Brian

 

Yeah something is definetly wrong there. I realize its a turbo, but i put down 385/427 on a 6.0 with only 5# of boost through an 80e. Have you done a compression check lately?

 

Yep. 160 across the board. All cylinders were good.

MY 6.0 is the low compression motor and was only rated at 300 fwhp back in 2000. It also has iron heads which would contain the heat more.

Don't know if that would affect my gains but that is a difference I see from the newer engines. Kinda annoys me but I am left without a clue.

 

I also have an lq4 with iron heads