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Revving past cam rev range.

 
Old 02-09-2019, 12:36 AM
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Default Revving past cam rev range.

Hi all, so I have a 226/232 608"/602" cam in a ls1 and the manufacturer rev range is 2400-6400 is there any point in revving higher? Engine has 102mm tb ,90 degree elbow ,super Vic manifold, 799 heads hand ported decked 8 thou 45 thou gasket, shaft mount rockers, tie bar lifters. I know the best way to find out is to rev it past 6400 and see what it runs but I just want the opinion of someone with professional or personal experience. Thanks in advance.
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Old 02-09-2019, 12:57 AM
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Yeah you’d want to rev higher that way you’re closer to peak power after you go to the next gear and the rpm drops, best thing to do is take it to the track and once you can launch it consistently try shifting higher and see if it picks up et/mph, will take a few tries to see what it likes most
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Old 02-09-2019, 07:46 AM
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what displacement is the engine?
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Old 02-09-2019, 08:54 AM
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Probably not but definitely maybe.

As said, try it and see. It will depend on how fast the torque curve drops off at higher RPMs, vs how much lower the torque is immediately after the shift. Which is going to be different for every combo and situation. There's no way to predict that from a parts list.
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Old 02-09-2019, 10:52 AM
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A dyno chart is a great tool to see how your particular engine carries past peak. As mentioned above, track times will tell the true story.
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Old 02-09-2019, 12:40 PM
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The fact that you're using a Victor Jr. intake completely changes the powerband of that cam and moves it up significantly.

That listed powerband is designed for basically stock motors. And even then, it's conservative. That cam will make power above 6400 even with a stock plastic intake manifold.
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Old 02-09-2019, 12:46 PM
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Also, keep gearing in mind. Underdrive gears multiply torque, and overdrive gears divide it. In second gear, you're multiplying torque more than in third. Hanging on to second just a little bit longer will put more torque to the ground. Sometimes that matters, and sometimes it doesn't.
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Old 02-09-2019, 10:20 PM
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Originally Posted by Ls7colorado View Post
what displacement is the engine?
still 346
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Old 02-10-2019, 12:21 AM
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I had almost the same cam (227/234) and I pulled it to 7000/7100. Stock cam pulled to 6400 (gto ls1) so I’d think your leaving a bit of rpm on the table if you shift that early.
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Old 02-10-2019, 12:29 AM
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Originally Posted by Che70velle View Post
A dyno chart is a great tool to see how your particular engine carries past peak. As mentioned above, track times will tell the true story.
another good way is tracking acceleration g's.
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Old 02-10-2019, 12:41 AM
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Super vic on a 346 is probably not peaking until 7k+
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Old 02-10-2019, 01:57 AM
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Originally Posted by DietCoke View Post
Super vic on a 346 is probably not peaking until 7k+
Originally Posted by HioSSilver View Post
another good way is tracking acceleration g's.
Originally Posted by Kfxguy View Post
I had almost the same cam (227/234) and I pulled it to 7000/7100. Stock cam pulled to 6400 (gto ls1) so Id think your leaving a bit of rpm on the table if you shift that early.
Originally Posted by .boB View Post
Also, keep gearing in mind. Underdrive gears multiply torque, and overdrive gears divide it. In second gear, you're multiplying torque more than in third. Hanging on to second just a little bit longer will put more torque to the ground. Sometimes that matters, and sometimes it doesn't.
Originally Posted by JakeFusion View Post
The fact that you're using a Victor Jr. intake completely changes the powerband of that cam and moves it up significantly.

That listed powerband is designed for basically stock motors. And even then, it's conservative. That cam will make power above 6400 even with a stock plastic intake manifold.
Originally Posted by Che70velle View Post
A dyno chart is a great tool to see how your particular engine carries past peak. As mentioned above, track times will tell the true story.
I'm, waiting on ls1tech to approve some photos one off dyno chart other of motor. Car is a dragster so could only do a pull in second gear because it wouldn't fit on the rollers properly. made 276 hp at 130 Kph in second. Trans is t400

Last edited by Devon Pollock; 02-10-2019 at 08:08 AM.
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Old 02-10-2019, 11:10 AM
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Originally Posted by Devon Pollock View Post
still 346
deffinatly making power passed 6400 even with the smallish cam as long as there is no valve float
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Old 02-11-2019, 07:37 PM
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Originally Posted by Ls7colorado View Post


deffinatly making power passed 6400 even with the smallish cam as long as there is no valve float
Taking it out this Friday so will see what happens.
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Old 02-11-2019, 08:03 PM
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I had a 5.7 Hemi with a 212/212 @ .050, .540/.540, 114 LSA on 110 ICL cam. Stock cylinder heads and a stock truck intake. My best track times were shifting in the 6,500-6,800 rpm range.

My stock long block Nissan Titan made peak HP at 5,000 rpm on a dyno but ran its best times shifting at 6,200.

You are just going to have to play with the shift points and see what it likes.
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Old 02-11-2019, 10:53 PM
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My car is fastest when I land on peak torque on the upshift. Assuming you peak at 5200 rpm, your best shifts might be 7600. ESP with that intake
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Old 02-12-2019, 05:06 PM
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Originally Posted by Fast355 View Post
I had a 5.7 Hemi with a 212/212 @ .050, .540/.540, 114 LSA on 110 ICL cam. Stock cylinder heads and a stock truck intake. My best track times were shifting in the 6,500-6,800 rpm range.

My stock long block Nissan Titan made peak HP at 5,000 rpm on a dyno but ran its best times shifting at 6,200.

You are just going to have to play with the shift points and see what it likes.
Thanks for your reply 👍
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Old 02-12-2019, 05:12 PM
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Originally Posted by Darth_V8r View Post
My car is fastest when I land on peak torque on the upshift. Assuming you peak at 5200 rpm, your best shifts might be 7600. ESP with that intake
I'll see how I go on Friday. It's still stock bottom end so might not go as high as 7600.
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