I went to the dyno with my 06 4.8 and had some tuning done. The best run was 395.5 hp and 409.9 tq..I think it could have put out more but I lost 1.5 lbs. of boost due to belt slippage.
The other dyno sheet , with all the runs listed are what I have done so far. 239.2 hp was bone stock , 253.0 was with the true duel 3" exhaust , the 339.2 hp was with the Radix and Radix tune. the 357.7 hp was with 3.4 pulley ( down from 3.7 stock). and the final run 395.5 hp was in fourth gear with tuning by Jeff Nance from "Speed Engineering" here in E. Tn.. The last couple of runs the belt was slipping because of the pulley change , using the stock belt. Stock boost with the 3.7 pulley was 7# and with the 3.4 was 9.5# , which leveled out to about 8# . I am going to try an 1" shorter belt.
Ron

 

very strong for a 4.8....now go to track and get the real numbers.

 

Congrats bro. You are getting good numbers out of the 4.8!

 

very strong numbers man, way to go

 

You mean people don't race dyno's ? I plan to. Just want to make sure I have enough power so I don't embaras myself.
Ron

 

 

Thanks, man .

 

lol, some people try

 

http://www.youtube.com/watch?v=iHIG5lLuGFQ
This guy races a dyno and wins.

 

Thats the third time i've seen that clip and I still love it. I also like the 9 sec. street legal vette vs the F-18 jet

.....back on topic