Revving past cam rev range.
02-08-2019, 11:36 PM
#1
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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.
02-08-2019, 11:57 PM
#2
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
02-09-2019, 07:54 AM
#4
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.
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.
02-09-2019, 09:52 AM
#5
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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.
02-09-2019, 11:40 AM
#6
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.
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.
02-09-2019, 11:46 AM
#7
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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02-10-2019, 12:57 AM
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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.
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.
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.
Last edited by Devon Pollock; 02-10-2019 at 07:08 AM.
02-11-2019, 06:37 PM
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02-11-2019, 07:03 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.
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.
02-11-2019, 09:53 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
02-12-2019, 04:06 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.
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.
02-12-2019, 04:12 PM
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