First off, numbers are SAE and smoothed. I tried my best to make this an apples to apples comparison but the dyno was acting up big time and I only got two recorded runs. I was scared to make any more passes due to the issues. I tried to get the fuel exactly the same and didn't get to adjust the timing back to where it was for the first pulls. I was down 2*-3* of timing. The WB02 got messed up on the second recorded run so I don't exactly know that the AFR's matched. But here are the combos and results. All pulls were done in Second gear. Total I gained 35rwhp and 22rwtq. The least I gained was 15/20rw. The cam extended the power band by 500rpm also. The injectors are at 100% at 6,200. I have a graph if someone can post it for me.


258rwhp 277rwtq
06' L33 51,000 miles
3.42 gears
31.7" tires
Summit 2 1/4" cat back
Summit CAI
Home ported TB
NGK TR55's
MSD wires
13.0:1 AFR
25*-27* timing
87 Octane
.98 correction factor

293rwhp 299rwtq
Same as above with 85,000 miles
Comp LSL 215/223 .604/.610 112
918 springs w/ locks and retainers
Comp 7.4 push rods
Custom 4" intake tube (made by me)
Close to 13.0:1 but not sure
23*-25* timing
87 Octane
.95 correction factor

My first pull was 288/294rw with 12.3 AFR. So I leaned it out 5% and made another pull but the WB02 read 14.7 from the beginning to end of the run which makes me think it wasn't working correctly. I was having alot of issues with the dyno for some reason. Turns out the magnet for the rpm pick up was broken and missing. But I got two really clean runs. So I am not sure what the final AFR was but I am pretty sure it was around 12.8-12.9. I usually see .1 change per % of fuel change. But I can't be sure. The truck picked up a solid 5/5 and pulled clean though.

I am doing Cal Speed headers next and then a ported TBSS intake and Ported LS3 TB. Hoping to get 350/320rw when it is all done.

 

Not to bad at all!

 

definately a nice gain, now go get a real tune on either 91 or 93!!

 

Thanks. Trust me, I tuned this thing to death. I am almost obsessive compolsive about my tuning. But It is going to stay on 87. Gas is just to expensive. Do you think it would pick up much using better gas. The DCR is pretty low with this cam so I am getting away with some on the timing side. Fuel is perfect as far as STFT's and the WOT curve. Only wavers a tenth of a point or so at WOT. Just need the WB not to act up so I am sure I am at 13.0.

 

Nice results, nut that is alot of timing for 87oct, imo

Can you post a graph?

 

It doesn't knock anywhere and it held two to three degrees more with the stock cam. Just pulled it out because it sounded like it was starting to knock but didn't show on the sensors. The sensors do work and are very sensitive. Figured that out through my drive tuning. I would rather be safe. Now the motor has alot less DCR due to this cam. DCR is down in the low to mid 7's if I am remembering correctly. I wish I could find the stock cam specs to compare. I know the .050 numbers but I need the Intake Closing Point ABDC for a comparison. I am honestly thinking of bumping it up a couple degrees when I do the final tune with the intake and exhaust. I am sure I lost a bit of dynamic compression with this cam which is costing me some power in comparison. In reality the motor didn't respond to timing or fuel stock. I added almost 15-18* of timing and leaned it out over a full 1.5 points over stock and only picked up 10/10rw on the original dyno tune. The combo responded to the fuel but didn't get to mess with the spark. When I get all the parts installed I am going to work the tune over hard core to get all I can out of it.

 

well usually the bigger cam will drop DCR and allow more timing to be run so I think you should gain even more with additional timing.

 

Not bad at all, especially for no LT headers.

 

Personally i would richen it up and bump the timing up. But to each his own.

 

I doubt you would pick up anything bumping the timing. 24-26 is good. Dial in the A/F and put some headers on it, should pick up well.