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Turbo Cobras
Why Our Turbo Cobra's Don't Have Torque
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<blockquote data-quote="smashedheadcat" data-source="post: 8439167" data-attributes="member: 7756"><p>There are many things that can shape your power curve. The stock heads/cams are designed to promote low rpm power at the cost of losing top end power. So it's going to be more biased to creating more power sooner (torque will be higher in lower rpms but lower in upper rpms). Next is the intake. If you use an intake with long runners it will want to build low rpm power but sacrifice peak performance on the top, it's opposite for short runner intakes. The sullivan intake is a shorter runner intake so it is going to do its part in shaping the power curve accordingly. Next is the power adder. Different power adders have their advantages so selection is critical to find a successful combination. For example, the stock 03 cobra uses the following:</p><p>low/mid range cams</p><p>low/mid range blower</p><p>Super short intake runners</p><p>Roots/twin screw type blowers are low/mid range blowers but this setup ended up working out great for street and strip. You get the cams and the blower designed to build all kinds of badass power down low and used an intake (super short runner) that can hold the torque curve flat in the upper rpms. All in all, it gave us a nice flat torque curve which pretty much everyone fell in love with. </p><p></p><p>Look at my twin turbo setup. </p><p>Low/mid range cams (stock)</p><p>low/mid range intake (unmodified 99-01 cobra)</p><p>low/mid range turbos (50mm with small a/r)</p><p>---------------------------------------</p><p>No rocket science or math required here, odds are I'm going to make more torque than HP, I am going to see a fast spool (full boost by 3100rpms) and power is going to peak at or around 5200-5500 rpms, stay flat for a little bit then fall off rapidly as rpms increase.</p><p></p><p>Messing with the combo poses some interesting changes. A sullivan intake will shift my power curve to the right. I'm contemplating this change as I have tons of things going for me to support low/mid rpm power and could use the intake to flatten the torque curve (this would reduce my power down low but keep my torque curve from dropping so much at the top). </p><p></p><p>There are a few variables that can manipulate the powercurve some like timing curves, messing with a/f ratios etc. but the big stuff is the cam(s), cam timing, intake and power adder if used.</p><p></p><p>Some random setup.</p><p>mid/high rpm cams (aftermarket cams)</p><p>mid/high rpm intake (sullivan)</p><p>mid/high rpm turbo (61mm twins)</p><p>----------------------------------</p><p>Odds are this is going to sacrifice bottom end power (slow spool) and as rpms increase so does torque, once you get to 4500-5000rpms you start hitting a sweet spot and then big power in the high rpms. More HP than TQ, still fast, just biased in the mid/high rpms. There are tons of things you can do with this setup. Adding an automatic with a loose converter would make for a badass ride.</p><p></p><p>One more setup. F1a procharger on 03 cobra.</p><p>low/mid range cams (stock)</p><p>extreme high rpm intake (super short intake runners (stock lower with hat)</p><p>mid/high range supercharger (Big centri) </p><p>------------------------------------</p><p></p><p>Cams help build low rpm power but the benefits are severely outweighed by an intake with 2 inch (insanely short) runners. An intake that short makes huge sacrifices down low and should help out in the upper rpms. (this intake should be ideal from 4500-10000 rpms). The supercharger doesn't help things much in the low rpms but should really come alive in the high rpms. So the stock cams' benefits are overshadowed by too much bias in the other direction. Using what we know, we could probably figure out that this setup would make dog shit low rpm power and then really try to bring the power in on at the top. Probably have a torque curve that continues to climb from the low rpms all the way to redline. A very one sided, setup that's poorly thought out. You could fix this by switching blowers to a KB and get a flat curve, or switch to a long runner intake to try to achieve balance.</p></blockquote><p></p>
[QUOTE="smashedheadcat, post: 8439167, member: 7756"] There are many things that can shape your power curve. The stock heads/cams are designed to promote low rpm power at the cost of losing top end power. So it's going to be more biased to creating more power sooner (torque will be higher in lower rpms but lower in upper rpms). Next is the intake. If you use an intake with long runners it will want to build low rpm power but sacrifice peak performance on the top, it's opposite for short runner intakes. The sullivan intake is a shorter runner intake so it is going to do its part in shaping the power curve accordingly. Next is the power adder. Different power adders have their advantages so selection is critical to find a successful combination. For example, the stock 03 cobra uses the following: low/mid range cams low/mid range blower Super short intake runners Roots/twin screw type blowers are low/mid range blowers but this setup ended up working out great for street and strip. You get the cams and the blower designed to build all kinds of badass power down low and used an intake (super short runner) that can hold the torque curve flat in the upper rpms. All in all, it gave us a nice flat torque curve which pretty much everyone fell in love with. Look at my twin turbo setup. Low/mid range cams (stock) low/mid range intake (unmodified 99-01 cobra) low/mid range turbos (50mm with small a/r) --------------------------------------- No rocket science or math required here, odds are I'm going to make more torque than HP, I am going to see a fast spool (full boost by 3100rpms) and power is going to peak at or around 5200-5500 rpms, stay flat for a little bit then fall off rapidly as rpms increase. Messing with the combo poses some interesting changes. A sullivan intake will shift my power curve to the right. I'm contemplating this change as I have tons of things going for me to support low/mid rpm power and could use the intake to flatten the torque curve (this would reduce my power down low but keep my torque curve from dropping so much at the top). There are a few variables that can manipulate the powercurve some like timing curves, messing with a/f ratios etc. but the big stuff is the cam(s), cam timing, intake and power adder if used. Some random setup. mid/high rpm cams (aftermarket cams) mid/high rpm intake (sullivan) mid/high rpm turbo (61mm twins) ---------------------------------- Odds are this is going to sacrifice bottom end power (slow spool) and as rpms increase so does torque, once you get to 4500-5000rpms you start hitting a sweet spot and then big power in the high rpms. More HP than TQ, still fast, just biased in the mid/high rpms. There are tons of things you can do with this setup. Adding an automatic with a loose converter would make for a badass ride. One more setup. F1a procharger on 03 cobra. low/mid range cams (stock) extreme high rpm intake (super short intake runners (stock lower with hat) mid/high range supercharger (Big centri) ------------------------------------ Cams help build low rpm power but the benefits are severely outweighed by an intake with 2 inch (insanely short) runners. An intake that short makes huge sacrifices down low and should help out in the upper rpms. (this intake should be ideal from 4500-10000 rpms). The supercharger doesn't help things much in the low rpms but should really come alive in the high rpms. So the stock cams' benefits are overshadowed by too much bias in the other direction. Using what we know, we could probably figure out that this setup would make dog shit low rpm power and then really try to bring the power in on at the top. Probably have a torque curve that continues to climb from the low rpms all the way to redline. A very one sided, setup that's poorly thought out. You could fix this by switching blowers to a KB and get a flat curve, or switch to a long runner intake to try to achieve balance. [/QUOTE]
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