Cam Overlap
Thread Starter
Instructor
Joined: Jun 2016
Posts: 161
Likes: 11
Cam Overlap
Trying to spec out a cam for an F1X build and wondering how many degrees overlap, if any, to have. Traditionally I know 0 is best for forced induction but someone on LS1tech picked over 100rwhp from their YSi build with 20 degrees overlap. Any tips? don't want an off the shelf cam.
Melting Slicks
Joined: May 2010
Posts: 2,378
Likes: 9
From: Katy TX
Mine is a 231/242 116LSA for 4.5 degrees of overlap. This was the cam setup in my car with the stock blower making 708/740. Now that I'm on the F1X, not sure it's the best cam for the application but we'll see how it does here soon. Hoping to be on the dyno in another 2 weeks or so.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Mine is a 231/242 116LSA for 4.5 degrees of overlap. This was the cam setup in my car with the stock blower making 708/740. Now that I'm on the F1X, not sure it's the best cam for the application but we'll see how it does here soon. Hoping to be on the dyno in another 2 weeks or so.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Thread Starter
Instructor
Joined: Jun 2016
Posts: 161
Likes: 11
376 ci, I want to see how long the stock long block will hold up. The car is a manual. Usage is to go as fast as possible I could care less about driveability lol. I want to shoot for 7400 rpm max.
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
Burning Brakes
Joined: Apr 2010
Posts: 1,001
Likes: 37
From: Farmington Missouri
376 ci, I want to see how long the stock long block will hold up. The car is a manual. Usage is to go as fast as possible I could care less about driveability lol. I want to shoot for 7400 rpm max.
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
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Race Director
Joined: Jul 2007
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From: Texas Hill Country
376 ci, I want to see how long the stock long block will hold up. The car is a manual. Usage is to go as fast as possible I could care less about driveability lol. I want to shoot for 7400 rpm max.
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
How would these heads, or similar flow numbers do?
https://weaponx-c7.myshopify.com/col...eads-stage-4-6
After that, you want the highest flowing heads, intake manifold, headers, and exhaust you can get your hands on like a sheet metal intake, aftermarket casting ported heads (rather than stock ported ones), 2 inch primaries with no cats, etc
a cam that makes power over 7000 RPMs is going to need an idle around 1000-1200 RPMs and will not give any drivability, low RPM throttle response, no more VVT or DoD (of course), and so on.
why do you want to make power at 7400 RPMs? you can make all the power you want at 6500.
Thread Starter
Instructor
Joined: Jun 2016
Posts: 161
Likes: 11
If high RPM power is your only concern then you need to consider what your weakest link will be to get there. Will the stock bottom end spin that RPM reliably?
After that, you want the highest flowing heads, intake manifold, headers, and exhaust you can get your hands on like a sheet metal intake, aftermarket casting ported heads (rather than stock ported ones), 2 inch primaries with no cats, etc
a cam that makes power over 7000 RPMs is going to need an idle around 1000-1200 RPMs and will not give any drivability, low RPM throttle response, no more VVT or DoD (of course), and so on.
why do you want to make power at 7400 RPMs? you can make all the power you want at 6500.
After that, you want the highest flowing heads, intake manifold, headers, and exhaust you can get your hands on like a sheet metal intake, aftermarket casting ported heads (rather than stock ported ones), 2 inch primaries with no cats, etc
a cam that makes power over 7000 RPMs is going to need an idle around 1000-1200 RPMs and will not give any drivability, low RPM throttle response, no more VVT or DoD (of course), and so on.
why do you want to make power at 7400 RPMs? you can make all the power you want at 6500.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
If high RPM power is your only concern then you need to consider what your weakest link will be to get there. Will the stock bottom end spin that RPM reliably?
After that, you want the highest flowing heads, intake manifold, headers, and exhaust you can get your hands on like a sheet metal intake, aftermarket casting ported heads (rather than stock ported ones), 2 inch primaries with no cats, etc
a cam that makes power over 7000 RPMs is going to need an idle around 1000-1200 RPMs and will not give any drivability, low RPM throttle response, no more VVT or DoD (of course), and so on.
why do you want to make power at 7400 RPMs? you can make all the power you want at 6500.
After that, you want the highest flowing heads, intake manifold, headers, and exhaust you can get your hands on like a sheet metal intake, aftermarket casting ported heads (rather than stock ported ones), 2 inch primaries with no cats, etc
a cam that makes power over 7000 RPMs is going to need an idle around 1000-1200 RPMs and will not give any drivability, low RPM throttle response, no more VVT or DoD (of course), and so on.
why do you want to make power at 7400 RPMs? you can make all the power you want at 6500.
Also here to the OP you better be looking at a solid lift cam. Will need a sheet metal intake, Plus like this guy has said replace every major part from motor to the rear end. No way this stock stuff is going to hold up at that RPM but a few time for any amount of time in a run.
Last edited by robert miller; Jun 27, 2017 at 11:15 AM.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
what we really need to know is what your actual goals are, and then we can tell you how to build it. Are you looking to build a drag car, road race car, street car, etc?
Burning Brakes
Joined: Nov 2015
Posts: 1,160
Likes: 40
From: Kuwait
Im also trying to get my car to do the same thing, i need my power to flow to 7k at least, my car is a z51 and the ratios are bad in my opinion since if i shift from 3rd to 4th the car seems to be a little sleepy at the beginning of the 4th gear, so instead of shifting at 6500 i would rather to shift at 7k in 3rd gear that way 4th gear will start with 5200 rpms instead of 4800, if you know what i mean
Drifting
Joined: Jul 2005
Posts: 1,646
Likes: 188
Im also trying to get my car to do the same thing, i need my power to flow to 7k at least, my car is a z51 and the ratios are bad in my opinion since if i shift from 3rd to 4th the car seems to be a little sleepy at the beginning of the 4th gear, so instead of shifting at 6500 i would rather to shift at 7k in 3rd gear that way 4th gear will start with 5200 rpms instead of 4800, if you know what i mean
Thread Starter
Instructor
Joined: Jun 2016
Posts: 161
Likes: 11
Thread Starter
Instructor
Joined: Jun 2016
Posts: 161
Likes: 11
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
I am talking stock trans & rear end, Plus you will need big CI motor and that blower will make you chg out your pants every time you push it. I had a RHS 427 WITH 245 trick flow heads that tooley had work on with almost the same cam just for the street as this guy has posted in here.
My c5 with this motor in it would make me think why am I doing this in this car. But again to c5 conv with no cage in it also. Robert
Melting Slicks
Joined: May 2010
Posts: 2,378
Likes: 9
From: Katy TX
I figure, if/when the motor lets go, I'll make sure to spec the cam out to be efficient for the new motor and power goals....for now, it's just a street car. Hopefully a 4 digit street car, but street car none the less.