98-00 853 Heads, cam only: post your graphs!
03-12-2005, 10:34 PM
#1
98-00 853 Heads, cam only: post your graphs! Be sure to list whether you have an A4 or M6, tuned or untuned, and all your other mods. No ported heads, please. I'm looking to know what kind of power to expect from a cam with these "weaker" heads.
Graphs are the best, but if all you have is numbers, then feel free to post those as well. And, since I'm feeling generous, track times just for the fun of it.
When I get my cam in, I'll post up too.
Graphs are the best, but if all you have is numbers, then feel free to post those as well. And, since I'm feeling generous, track times just for the fun of it.
When I get my cam in, I'll post up too.
03-13-2005, 07:58 AM
#3
I made 383/374 with a TSP 225/114 in a 98' WS6 M6. I have a ported TB, Lid, 85mm Maf, LS6 intake, Pacesetter LT's, ORY, Hooker cat back, UD pulley, free mods and 4.10's. Last week the car went 12.5@114.10 on a bad clutch. Full tank of gas and tools in the car. I would guess around 3,700 lbs. Some one posted a graph for me, so do a search under my name.
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03-15-2005, 01:00 PM
#17
Originally Posted by jlaw
M6, full bolt-ons, when it was cam-only:
Note that Jlaw's graph and Ws6ik_2000's both are cam only, same heads, same transmission, same mods and same peak point (roughly). Now note that their peak HP and peak TQ numbers are also almost exactly the same.
NOW... look at the low-end behavior of the graphs. Look at the power at 3000 RPMS, for example. See how much higher Ws6ik_2000's is? That is a big asset both for daily driving/street power, and for the initial launch at the strip (assuming that they are launching in the 2000-3000 range).
Of course, a bit of this can be explained by small differences in mods. I wonder whether Jlaw has true duals, for instance...
But the major point is that this is the fabled "area under the curve" that we've all heard about. Now I don't want this to be the entire focus of this thread, but I just wanted everyone to notice what I am noticing.
(BTW, Jlaw, no offense I hope! Looks like you're making more power now anyway!)
Anyway, I'm looking to see if I can make a competetive peak # (for top-end power) while REALLY excelling in "area under the curve." Cam's going in soon, so we'll see...
03-16-2005, 02:51 PM
#19
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I don't mind at all, although I think your analysis is a bit off. The 231/237, in these 2 graphs, appears to outperform the F13 only at very low RPM, which can be attributed to a ton of factors. What advance is ground into the 231/237? We don't know. My F13 is on a 110icl, sacrificing a bit of low end for more top end. Additionally, on that pull, the cutouts were open on my QTP ORY, so there was very little backpressure. By ~3500rpm the graphs are about even, then the F13 starts to pull ahead and carries power and torque higher and farther than the 231/237.
For area under the curve, I'm not quite sure what you're seeing. The F13 curves have more area under them, even with the smoothing so far off on the 231/237.
Finally, as for RPM at the track... I don't know anyone who launches that low. No big cam is going to be a low-end beast, that's what gears are for.
For area under the curve, I'm not quite sure what you're seeing. The F13 curves have more area under them, even with the smoothing so far off on the 231/237.
Finally, as for RPM at the track... I don't know anyone who launches that low. No big cam is going to be a low-end beast, that's what gears are for.