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#1 |
![]() Drives: 2018 SS 1LE Join Date: Aug 2018
Location: LA
Posts: 54
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Cam without the rough idle?
Any recommendations for a cam without the rough idle and loud lope? I want the power, but without all the extra noise and attention the cam brings. Any recs?
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#2 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: '18 1SS 1LE Join Date: Sep 2017
Location: Pennsyltucky
Posts: 2,606
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I'm pretty sure if you stick with a wide LSA you will avoid excessive lope.
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'18 1SS 1LE Black, PDR
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#3 |
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@texan.1le
Drives: '18 Camaro 1SS 1LE, PDR Join Date: Jun 2018
Location: Temple, TX
Posts: 182
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LSA is only a calculated number and isn't as great of an indicator of how rough the cam's idle will be. The more important thing to pay attention to is overlap. A cam with more overlap (ex. +10 deg) will have more lope/chop. A cam that goes into the negative overlap range (0 to -15) will be smoother. This is a handy calculator that will tell you the amount of overlap a cam has and give you a general idea of how lopey/choppy it will be. Just use the intake duration, exhaust duration, and the LSA (without any advance numbers. ex. just 112 not 112+4, etc.) and it will give you a measurement in degrees. http://www.wallaceracing.com/overlap-calc.php
For example, the factory LT1 cam (200/207 116.5) has an overlap amount of -29.5 degrees. A Texas Speed VVT3 (235/239 116) has an overlap amount of 5.0 degrees
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'18 1SS 1LE - "Mongoose"
'15 Malibu 2LT - daily Last edited by Z0Tex; 03-11-2019 at 08:54 AM. |
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#4 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,665
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There is no free lunch...in order to make max NA power and extract all the potential peak power from a specific engine combination you need overlap to do this. Overlap is what causes the engine to chop...the more overlap the more power, the more chop, the less efficient it becomes at lower rpm.
The goal with cam shaft selection is to find the best balance of power and efficiency for the intended application. It also should be specked appropriately for the heads and intake combination. The point here is: You can purchase a cam that will idle very smooth and drive like stock but you will likely only gain 30whp. Now if you do Heads, mild cam, ported MSD/95mm Tb, then you will likely see 90whp gains. A max effort Cam might gain 70whp on it's own and 120-130whp with the right heads and intake but you are going to sacrifice some drivability and low end in exchange for peak power.. This is where Superchargers come into play. You can make max effort NA power easily on low boost and give up virtually nothing in efficiency, drivability, and fuel mileage compared to stock. In the end you have to figure out what is right for you.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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#5 |
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Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
Posts: 1,075
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Best solution is to ask vendors in the business of selling cams. Many, many variables to selecting the right cam for your car. Raw lift/duration numbers are not the sole determining factor.
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me Two that wanna stone me One says she's a friend of mine... |
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