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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Cobra Jet Cams or Comp Cams????
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<blockquote data-quote="SmokeGreyHatch" data-source="post: 13360868" data-attributes="member: 45470"><p>There is so much misinformation around cams. The CJ cams are worthless. The ramp rates are not aggressive by any means. Example: JDM took a N/A 2013 Cobra Jet from 430 rwhp stock (through auto) to 550 rwhp with just a valve job and custom cams. I know of another car with boss heads, boss intake and CJ cams that put down 440 rwhp through an MT82. I made 453 with a CJ intake and exhaust on pump 91. </p><p></p><p>If you're using the stock valve springs you can only get away with up to 12.5 mm of lift. Anything more may require shimming the valvetrain and/or a change to the boss head architecture, plus the obvious supporting valve spring. </p><p></p><p>Lastly, you can run Comp Stage 3 cams WITH VCT. If you mock it up it's completely clear. A reputible tuner can tune timing events to be acres away cleanrance wise. It HAS been proven, but Comp doesn't want sheep going out, not installing limiters and getting crazy with timing events. Any tuner with reputable cam timing/design and engine knowledge can tune through this. What this means with a 50 degree sweep is you CAN have stock cam low end with stage 3 top end, not crazy losses down low as a trade off for up top. Here is the combo on one of said vehicles:</p><p></p><p>Boss intake/90 mm TB/ JLT CF CAI</p><p>1 3/4 longtubes, full off road exhaust</p><p>Comp Stage 3's full VCT</p><p>Completely stock GT heads</p><p></p><p>502 rwhp on E85, 520 rwhp on FTW</p><p></p><p>If I were doing custom cams N/A, I'd start with comp Stage 3's, but 12.5mm on both and increase duration 3-4 degrees on the intake and 6-7 on the exhaust. Timing tweaked with VCT. You'd have a car with stock low end that would pull all day long to 8k.</p></blockquote><p></p>
[QUOTE="SmokeGreyHatch, post: 13360868, member: 45470"] There is so much misinformation around cams. The CJ cams are worthless. The ramp rates are not aggressive by any means. Example: JDM took a N/A 2013 Cobra Jet from 430 rwhp stock (through auto) to 550 rwhp with just a valve job and custom cams. I know of another car with boss heads, boss intake and CJ cams that put down 440 rwhp through an MT82. I made 453 with a CJ intake and exhaust on pump 91. If you're using the stock valve springs you can only get away with up to 12.5 mm of lift. Anything more may require shimming the valvetrain and/or a change to the boss head architecture, plus the obvious supporting valve spring. Lastly, you can run Comp Stage 3 cams WITH VCT. If you mock it up it's completely clear. A reputible tuner can tune timing events to be acres away cleanrance wise. It HAS been proven, but Comp doesn't want sheep going out, not installing limiters and getting crazy with timing events. Any tuner with reputable cam timing/design and engine knowledge can tune through this. What this means with a 50 degree sweep is you CAN have stock cam low end with stage 3 top end, not crazy losses down low as a trade off for up top. Here is the combo on one of said vehicles: Boss intake/90 mm TB/ JLT CF CAI 1 3/4 longtubes, full off road exhaust Comp Stage 3's full VCT Completely stock GT heads 502 rwhp on E85, 520 rwhp on FTW If I were doing custom cams N/A, I'd start with comp Stage 3's, but 12.5mm on both and increase duration 3-4 degrees on the intake and 6-7 on the exhaust. Timing tweaked with VCT. You'd have a car with stock low end that would pull all day long to 8k. [/QUOTE]
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Cobra Jet Cams or Comp Cams????
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