6.0L 5-Speed Dyno Day Today
10-15-2008, 09:56 PM
#161
TECH Senior Member
iTrader: (6)
Join Date: Jul 2005
Location: Decatur, AL
Posts: 5,257
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=hirdlej;4024698]UPDATE*= Just got back from the NEW dyno run. It both confirmed a few things and put a lot of things into perspective for me. My co-worker brought his 10K mile '08 LS3 Auto Vette with since he found out where I was going over lunchtime.
First of all, here's my BEST Run of the day, Can you say "Torque" for a little motor???
What I really like with yours compared to mine is you are right at 400lbs tq by 3800 where mine is around 370tq. Mine didn't peak in torque until 4700. But there is considerable differences in cam and especially the characteristics of the L92 heads.
First of all, here's my BEST Run of the day, Can you say "Torque" for a little motor???
What I really like with yours compared to mine is you are right at 400lbs tq by 3800 where mine is around 370tq. Mine didn't peak in torque until 4700. But there is considerable differences in cam and especially the characteristics of the L92 heads.
10-15-2008, 10:17 PM
#162
Some solid #'s that we know are not a fluke, and sick torque! 
Two things though:
1. Your power test w/o tube and box with a good idea however it was a tad bit flawed when looking at the torque because it did not have the tube there to straiten out the air to the throttle blade. I theorize that with tube and no box you would have seen more power everywhere especially with a high flow cone filter on the end to straiten out the air.
Is this really that crucial? Not trying to be a smartass but trying to learn. What you're saying makes sense but are we splitting hairs here? I'm thinking about a open element air cleaner on an old Quadrajet carburetor. The air comes in from all sides and then immediatly enters through the venturi's. I've never seen where adding a smooth stack or tube makes any significant power difference. Eh I dunno, I think I'm done trying to wring anymore power out of the current combo. Don't get me wrong, it's a blast to drive but I have the inkling in the back of my wind wondering "what if I put 1 larger step cam in...........?"
2. On your dyno overlay both curves were based off of speed and would be more apples to apples if they were matched by RPM's.
I didn't even realize this until after we left the dyno shop. I can assure you though that both vehicles were started with 2K RPM pulls.
Either way I have enjoyed this thread thoroughly and look forward to results with the new cam hopefully with and w/o air box!
Two things though:
1. Your power test w/o tube and box with a good idea however it was a tad bit flawed when looking at the torque because it did not have the tube there to straiten out the air to the throttle blade. I theorize that with tube and no box you would have seen more power everywhere especially with a high flow cone filter on the end to straiten out the air.
Is this really that crucial? Not trying to be a smartass but trying to learn. What you're saying makes sense but are we splitting hairs here? I'm thinking about a open element air cleaner on an old Quadrajet carburetor. The air comes in from all sides and then immediatly enters through the venturi's. I've never seen where adding a smooth stack or tube makes any significant power difference. Eh I dunno, I think I'm done trying to wring anymore power out of the current combo. Don't get me wrong, it's a blast to drive but I have the inkling in the back of my wind wondering "what if I put 1 larger step cam in...........?"
2. On your dyno overlay both curves were based off of speed and would be more apples to apples if they were matched by RPM's.
I didn't even realize this until after we left the dyno shop. I can assure you though that both vehicles were started with 2K RPM pulls.
Either way I have enjoyed this thread thoroughly and look forward to results with the new cam hopefully with and w/o air box!
Thanks and I hope others found this info useful as well. I can assure you while test driving the truck the other night I removed the MAF and let the air intake tube dangle. After making a few WOT runs I could feel NO seat of the pants increase in performance this way.
10-15-2008, 10:41 PM
#164
TECH Veteran
I think you're really going to like that new cam. I think that below 2500rpm you might lose a bit of torque, but from there on up I think you'll actually have more torque. I also feel it will have 25hp more than you have right now and peak at 5500-5700. With a stick you'll like the higher rpm difference.
10-16-2008, 06:58 AM
#165
I think you're really going to like that new cam. I think that below 2500rpm you might lose a bit of torque, but from there on up I think you'll actually have more torque. I also feel it will have 25hp more than you have right now and peak at 5500-5700. With a stick you'll like the higher rpm difference.
10-16-2008, 07:16 AM
#166
I guess I'm kind of confused with your cam choice. This entire time your reference point was your 468 big block and that torque down low. I remember on your first impressions you said you were disappointed with low end torque, but that it pulled like a raped ape up top. So now you're gonna switch to a cam that reduces your low end even more just because it will increase your top end HP?
10-16-2008, 08:03 AM
#167
TECH Veteran
10-16-2008, 08:20 AM
#168
TECH Junkie
iTrader: (13)
Join Date: Apr 2006
Location: Walker
Posts: 3,312
Likes: 0
Received 0 Likes
on
0 Posts
I say bring it to a track before you do anything else. See where you should be shifting at with numbers to back it up.
THEN and only then if you still want to swap out the cam again go for it IMO.
THEN and only then if you still want to swap out the cam again go for it IMO.
10-16-2008, 08:29 AM
#169
I guess I'm kind of confused with your cam choice. This entire time your reference point was your 468 big block and that torque down low. I remember on your first impressions you said you were disappointed with low end torque, but that it pulled like a raped ape up top. So now you're gonna switch to a cam that reduces your low end even more just because it will increase your top end HP?
