Hot Cam Dyno....
06-08-2011, 02:06 PM
#1
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Hot Cam Dyno.... Well guys I've gotten my car tuned and dynoed. 345rwhp 350rwtq. Shift points are set to 6200. I have Pacesetter MID-TUBE headers, 52mm TB, 3500 stall, AFR 180cc heads, 1.7rr, lid, under drive pulley, and 3.73 gears. 3360 race weight with me in the car. I'm disappointed in the numbers. I was expecting at least 370rwhp. I mean (before the tune) I ran a tuned LS1 with suspension mods and a mid sized Thunder Racing cam and he only beat me a fender. I ran another LS1 with a tune and 228r Texas Speed cam and put a car on him! My car really moves it's just not making the numbers! Do you guys think the MID-TUBE headers is holding me back? My heads flow 207cfm at .500 lift on the EXHAUST SIDE. How much more power can I gain from LONG-TUBE headers? I need a comparison.
06-08-2011, 02:26 PM
#3
The LTs would get you a little more low and mid range torque but not boost the peak power a great deal IMO.
That power and the light race weight will yield some nice ETs. It does seem a bit low but all dynos are different but I would not lose sleep. Post the graph so we can see it and maybe identify any issues.
Is it a dyno tune or a mail order tune?
That power and the light race weight will yield some nice ETs. It does seem a bit low but all dynos are different but I would not lose sleep. Post the graph so we can see it and maybe identify any issues.
Is it a dyno tune or a mail order tune?
06-08-2011, 02:37 PM
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Geoff at EPS tuned the car. He said he could't print the graph because he doesn't have a printer hooked up yet... It was also 98* degrees outside so maybe that had something to do with it... I hope...
06-08-2011, 02:38 PM
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06-08-2011, 02:46 PM
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06-08-2011, 03:09 PM
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That's about what I was making with bolt-on's and a cam. It is a bit of an ego hit to have low numbers on the dyno, but remember what your car actually does on the street. Your converter and the 4l60 are eating up some numbers, but don't sweat it! There's a huge difference between a dyno queen and a fast car. My theory has always been that high school kids go to the dyno, and men go to the track ;-)
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06-08-2011, 03:10 PM
#8
you have to remember your an auto not a m6 and they soak up alot of power and stall isnt helping. If that were an m6 car you would be looking at roughly 360-370rwhp. IMO those tiny 180cc heads are not what there cracked up to be power seems to be inline with your mods.
06-08-2011, 03:19 PM
#10
My personal experience supports my claim on my car.
Red line = Mid tube headers
Blue line = Long tube headers
For full disclosure the run with the long tubes had a different cam but the only difference was only .030" less on the lift. Regardless the lesser lift could not have widened the torque band like the graph indicates IMO.
If the red line hade not floated at 6K RPM, the peak power would have been nearly the same.
Red line = Mid tube headers
Blue line = Long tube headers
For full disclosure the run with the long tubes had a different cam but the only difference was only .030" less on the lift. Regardless the lesser lift could not have widened the torque band like the graph indicates IMO.
If the red line hade not floated at 6K RPM, the peak power would have been nearly the same.
06-08-2011, 03:22 PM
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By your own dyno the longtubes gained at least 8 accross the board, even carrying up the drop off at the top end its still higher.
I also like your torque curve, for over 2000 rpm it is above the torque peak of the previous run. What i dont like is your top on both runs, you know why it dropped on the red curve, but the blue curve flattens, fuel?
I also like your torque curve, for over 2000 rpm it is above the torque peak of the previous run. What i dont like is your top on both runs, you know why it dropped on the red curve, but the blue curve flattens, fuel?
Last edited by WS Sick; 06-08-2011 at 03:33 PM.
06-08-2011, 03:34 PM
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I have a RevMax (local shop out of Arizona) 9.5" 3500 stall built for nitrous... I'm thinking about getting a set of painted LONG TUBE Pacesetters the race version and y pipe... Would I have to get another tune if I make the swap or what? AFR is about 12.9-13.1 at WOT.
Last edited by NewOrleansLT1; 06-08-2011 at 03:48 PM.
06-08-2011, 03:36 PM
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06-08-2011, 03:52 PM
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AFR is about 12.9-13.1 at WOT. I think that's rich enough to support the extra air flow of the LONG TUBES huh?
06-08-2011, 04:26 PM
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Those numbers don't sound bad for this cam and especially through a high stall a4. Trying to get mine dyno'd again in the next few weeks, biggest change since #s below were the lid and porting heads. I'm also running midlength headers. I really don't care if I'd pick up another 5hp or so with LT's. These are a high quality coated ss headers that look and fit great with no issues.
06-08-2011, 04:33 PM
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