Any LS2 402 + ET Heads + FAST 90/90 dyno numbers yet?
04-20-2006, 08:35 PM
#61
Originally Posted by 98Z28CobraKiller
Hey don't mean to jack your thread here but, Patrick would this cam be better for me also?
04-20-2006, 09:32 PM
#62
Originally Posted by 98Z28CobraKiller
Hey don't mean to jack your thread here but, Patrick would this cam be better for me also?
04-20-2006, 09:35 PM
#63
Originally Posted by V-10 Killer
It's alright, I've been following your progress and I'd like to know the same. My intake valve closing is 53 deg ATDC, and now I'm wondering if I'm close enough to the magical 50 too.
04-20-2006, 09:45 PM
#64
Originally Posted by Patrick G
53 degrees ABDC is OK, you'll still make great power up high, you're just going to be taking away from the area under the curve past 50 degrees. Basically, you're trading DCR for a higher rpm peak that really doesn't match the intake manifold's runner length.
04-20-2006, 09:48 PM
#65
Originally Posted by V-10 Killer
What about advancing/retarding (I don't know which way I'd have to go) the cam 2 degrees to get 51 deg ATDC? Would that help? I don't know how to factor that in when calculating the DCR.
04-20-2006, 10:36 PM
#66
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Originally Posted by Patrick G
If that's the case, then a 248/254 114LSA 110ICL is going to be a TURD in your car. Let me explain why.
First off, your intake valve closing point is too late for a car driven on a regular basis. On a 408, it should be closer to 46-50 degrees ABDC at .050" to work best with an LS6 or FAST intake.
Secondly, your dynamic compression is going to be LOW with only 11.0:1 SCR. With your cam advanced 4 degrees, I get only 7.83 DCR.
Here's a cam I feel would meet your needs much better (ie much more power under the curve):
240/250 .609/.616 111LSA +3
With this cam, you DCR is raised to 8.3 (that's a full 5 tenths!) and your intake valve closing point is 48 degrees ABDC (which will match the tuned runner length of the LS6/FAST intake better), and finally, your overlap is now better centered over TDC (which will allow the motor to rev better past peak hp). BTW, even though the cam is a 111LSA, the overlap is exactly THE SAME as your 114LSA cam (23 degrees at .050").
First off, your intake valve closing point is too late for a car driven on a regular basis. On a 408, it should be closer to 46-50 degrees ABDC at .050" to work best with an LS6 or FAST intake.
Secondly, your dynamic compression is going to be LOW with only 11.0:1 SCR. With your cam advanced 4 degrees, I get only 7.83 DCR.
Here's a cam I feel would meet your needs much better (ie much more power under the curve):
240/250 .609/.616 111LSA +3
With this cam, you DCR is raised to 8.3 (that's a full 5 tenths!) and your intake valve closing point is 48 degrees ABDC (which will match the tuned runner length of the LS6/FAST intake better), and finally, your overlap is now better centered over TDC (which will allow the motor to rev better past peak hp). BTW, even though the cam is a 111LSA, the overlap is exactly THE SAME as your 114LSA cam (23 degrees at .050").
i appreciate someone that says that is a turd and has an explanation, rather than just making a comment with no other facts to support it. thanks bro!
im learning something 4sure! im going to cut and paste this into a word doc so ill have it the next time i talk to my guy.
this is the whole reason i came on here was to see what exactly i should be doing vs. not doing.
04-21-2006, 11:11 AM
#67
Well, back on track a little, I got the tracking numbers for my heads today. Just in time for beautiful weather. So with any luck, I could have everything assembled by next weekend. Now for a little VE tuning, and off to a professional tuner for some numbers.
FINALLY, I'll have something useful to contribute to my own thread LOL
FINALLY, I'll have something useful to contribute to my own thread LOL
04-21-2006, 08:23 PM
#68
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Originally Posted by V-10 Killer
Well, back on track a little, I got the tracking numbers for my heads today. Just in time for beautiful weather. So with any luck, I could have everything assembled by next weekend. Now for a little VE tuning, and off to a professional tuner for some numbers.
FINALLY, I'll have something useful to contribute to my own thread LOL
FINALLY, I'll have something useful to contribute to my own thread LOL
