Finally got back to the dyno after the 6L swap. Pullied down to 2.75". The numbers are ok but overall I'm not impressed with my numbers.
Check out my graph from the 5.3@ 9PSI vs. the 6.0@ 8PSI. I gained a whopping 30rwhp and 14rwtq by swapping to a 6L and a 210/218 .551 112lsa cam and dual springs. And if the numbers weren't depressing enough check out the TQ curve or lack there of.
On the 5.3 it shot up and leveled off with the 6L its a gradual climb. The 5.3 had the stock cam in it. I am wondering if this cam choice (suggested by Vinci) was the right choice.
Maybe I'm off here so you guys chime in. I don't think the gains were worth the effort. I also offer up that other than a Maganflow muffler the exhaust is stock. Maybe I'm chocking it off. The Pacesetter are still in my garage, no time to install just yet.
These runs were done on different dynos but both are DynoJets so I don't think they would be that much different.
Give me your thoughts.

5.3L @ 9psi

6.0L @ 8psi 17.5* timing and AFR at 11.6 to 11.8

On the Dyno




Leaving the Dyno

 

About time!

I think you may be in dire need of the pacesetters and off road Y. I'm really surprised at the lack of gain as well. I would have expected the tq to have been more. And only 8psi with a 2.75??? Think you may have had some belt slip. What were the AIT's like? That may have been what was killing you.

 

I would expect quite a bit more as well . I wouldnt think that you would be lower than Blownchevy's numbers being as you have more displacement and basically same exhaust system. Do you have the 90MM TB mod? If not, I think youd stand to gain a ton of power when you do that and the pacesetters and Y pipe.
BTW I have an 04 6.0 with 15K (supposedly) miles that will be here this weekend . Its probably going to be couple weeks before we get the cam and STS on there though. Im anxious to see what it does vs. the 5.3 and vortech.

 

Sorry I wasn't able to meet you at the Dyno Those numbers are more than respectable, but your point about a lot of effort and little return rings true. Get those Pacesetters on there and get back on the dyno...I would imagine there is some serious restriction in the stock piping. Did John do any tuning for you or was it just a dyno session?

 

John said he thinks I could see up to 35-40hp after the long tubes get on. That would be nice. I have the stock TB. This was a full up dyno tune. He changed all kinds of tables and settings. My first AFR wouldn't ever register because I was at something like 8.5:1 or whatever. He had to decrease 14% fuel just to get it to 10.0:1 so he could see it on the charts. So I was WAAAAY rich. Maybe that explains my horrible MPG . I think the cam is killing my boost. It has 52* of overlap. But I'm not that smart on cams. Maybe freeing up the exhaust will help out. I am running 17.5* of timing. Before the tune I was running at 20* with no KR at all. John thought that was way to high and wanted to keep me at 17 to 18 so if I get into some cold weather I wont have an issue. One thing I have found since I left is, if I'm at idle and turn on the A/C it won't blow cold and the compressor kicks on and off and the truck almost dies everytime and actually did die a couple times. If I rev it up to 900rpm or so it gets real cold and idles great. I guess I need to have him look at that. The part that frustrated me was the low numbers and then when I drive it home, it really doesnt feel any stronger than when I drove it there. 2 more pounds of boost and leaned way out, increased 30hp and some tq and spent $400 but the SOTP meter didn't move. Guess I will get the Pacesetters on and see what she does. Anybody else want to blame the cam? Other opinions?

 

Checked the pulley for belt dust, it was clean as a whistle. My AIT's, I don't know for sure but it was about 85* @ 53% humidity in the shop according to the chart. I checked my intercooler fluid after each run and it was luke warm at best so I don't think the air was that hot. And yes, only 8#'s with that pulley. I figure the LT's will probably cost me another pound as well. I feel a cam swap in my future. Well, in a few months after I get back from fighting evil doers

 

Should the HP and TQ curves intersect at 5250 rpms? They do on the first graph but cross way short on the second. Maybe the dyno graph isn't scaled properly?

 

52* of overlap is huge IMO.. thats strange that they would recommend that cam for you. The comp cam I have, if I recall correctly, has no overlap or -2 or something like that. There are definately some things for you to work out, as I would expect at least 500rwhp out of that setup. But you will need the bigger TB to get there. Youre really not far off though. I think you could get there with the headers, Y and TB. Do you have a tuning program? I would hookup a wideband and HPTuners and get on there and put some timing in it.
Did you check the seals when you installed the Radix on the 6.0?? Maybe its not on there all the way and you are loosing some boost as NakedAV did.

 

I doubt the cam selection is hurting you very much.Check the cone filter to make sure it is not collapsing on you at full throttle.On my first set of dyno runs with my old 5.3, I had a K&N that was collapsing and dynoed 389hp,removing the filter resulted in 414hp.Check for little things.

 

Can you blow those charts up or email them to me so I can get a good look at the conditions and a better look at the curves. Also, don't you have a torque converter in the vehicle now? What were your 02 numbers? I have a client that went to two different dynojets in Illinois and one wideband read 12.6 and the other read 10.8. However, the tech 2, autotap and hp tuners all showed the 02s at 940s. I need some more info. Is the other dyno in a space as compact as this one as well? How does the exhaust escape the building? Joe.