COMP XFI AFM cams
Thread Starter
Race Director
Joined: Jan 2014
Posts: 10,709
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From: Fulshear, TX
COMP XFI AFM cams
I like the idea of being able to retain both VVT & AFM if I were to go the cam route. Does anyone have any experience or insight on these cams? I see a few forum vendors selling them on their websites, but haven't actually found any discussion on them other than one Super Chevy article.
http://www.compperformancegroupstore...ode=Gen5XFIAFM
http://www.superchevy.com/how-to/eng...-lt1-cam-swap/
http://www.compperformancegroupstore...ode=Gen5XFIAFM
http://www.superchevy.com/how-to/eng...-lt1-cam-swap/
Last edited by Kracka; Oct 24, 2016 at 11:09 AM.
Drifting
Joined: Apr 2015
Posts: 1,276
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VVT with a cam phaser limiter, yes. AFM? Ohh hell no! If your car ever suffers a valve train failure it will likely be an AFM lifer at fault. I'm not an alarmist but, AFM is tuned out of my Z and the new cam is not AFM compatible. Half of the lifters for afm cams are special (as in short bus lol) and the cam lobes they ride on are different from the cam lobes the other standard lifters ride on.
John
John
Last edited by JHEBERT; Oct 26, 2016 at 09:17 AM.
Thread Starter
Race Director
Joined: Jan 2014
Posts: 10,709
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From: Fulshear, TX
I'm aware you dislike VVT, AFM. My personal opinion, I'm not willing to remove technology from the car in order to gain a few WHP since ultimate power is not my end goal. I do a lot of cross-country roadtrips and enjoy the extra couple MPG that AFM yields for me. If adding a cam to this engine is going to make it unreliable (which I doubt, if done properly), I'll just stick with my current bolt-on setup and keep the 5/100 warranty. I also won't do it if drivability is greatly affected, which is why I was hoping to find people with first-hand experience with these cams.
Last edited by Kracka; Oct 26, 2016 at 10:41 AM.
Drifting
Joined: Dec 2012
Posts: 1,630
Likes: 203
From: MI
I'm aware you dislike VVT, AFM. My personal opinion, I'm not willing to remove technology from the car in order to gain a few WHP since ultimate power is not my end goal. I do a lot of cross-country roadtrips and enjoy the extra couple MPG that AFM yields for me. If adding a cam to this engine is going to make it unreliable (which I doubt, if done properly), I'll just stick with my current bolt-on setup and keep the 5/100 warranty. I also won't do it if drivability is greatly affected, which is why I was hoping to find people with first-hand experience with these cams.
On top of that you gotta think about tuning. All the shops across the US are mostly doing after market swaps that delete AFM. Even on mild cam swaps. part of the reliability is working with tested parts/tunes.
Last edited by MikeLsx; Oct 26, 2016 at 10:55 AM.
Race Director
Joined: Jul 2007
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From: Texas Hill Country
I'm aware you dislike VVT, AFM. My personal opinion, I'm not willing to remove technology from the car in order to gain a few WHP since ultimate power is not my end goal. I do a lot of cross-country roadtrips and enjoy the extra couple MPG that AFM yields for me. If adding a cam to this engine is going to make it unreliable (which I doubt, if done properly), I'll just stick with my current bolt-on setup and keep the 5/100 warranty. I also won't do it if drivability is greatly affected, which is why I was hoping to find people with first-hand experience with these cams.
AFM delete cam = 100 rwhp for $2500 dollars
not what I would call "a few HP."
Le Mans Master
Joined: Aug 2005
Posts: 5,375
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From: CA.
St. Jude Donor '13-'14-'15
If you follow GM's history of DOD/AFM engines they were all prone to failures and they have had 1000's of them !! Corvettes Camaros and Silverados
It became so bad that GM has just recently re-designed the DOD system on ALL of their vehicles that use that technology
Truth being that most failures were all just STOCK engines---Modded engines are even MORE prone to failures as the DOD is MAP triggered and cammed engines alter the stock MAP values causing false and un controlled DOD activation/deactivation
I would NEVER install a cam on a car equipted with DOD unless it were deleted---You are just asking for trouble on an admittedly already poor system( hence for the new design in 2017)
It became so bad that GM has just recently re-designed the DOD system on ALL of their vehicles that use that technology
Truth being that most failures were all just STOCK engines---Modded engines are even MORE prone to failures as the DOD is MAP triggered and cammed engines alter the stock MAP values causing false and un controlled DOD activation/deactivation
I would NEVER install a cam on a car equipted with DOD unless it were deleted---You are just asking for trouble on an admittedly already poor system( hence for the new design in 2017)
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Pro
Joined: Jan 2013
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From: Arizona
Race Director
Joined: Jul 2007
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From: Texas Hill Country
Except a supercharger can net you a minimum of 150rwhp and up to 250rwhp (for essentially the same price as 150) before you start needing to do anything too crazy. Not to mention cracking the engine open is where the line is drawn for many people, a supercharger you can just unbolt in half the time it takes to install....
Melting Slicks
Joined: Aug 2010
Posts: 3,063
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From: Tumwater, WA
Is that $2500 number just a relative number you picked or is that an actual cost? I will be doing a cam in the future and am trying to find a shop and a price for the purchase, install and tune of a DOD/AFM delete cam. I have seen others saying $3500 or more. Id love to be in the $2500 range for a good cam install and tune.
Last edited by S'vette; Oct 28, 2016 at 12:39 AM.
Race Director
Joined: Jul 2007
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From: Texas Hill Country
I guess it could depend on your location but I would expect in the neighborhood of 500 for the cam and 20 hrs of labor at 80 per hr is 1600, leaves 400 for other stuff needed....3500 sounds ridiculous.
Of course if independent shop rates are 140 where you are then you are up there.
Of course if independent shop rates are 140 where you are then you are up there.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
I couldn't find the original article off the GM website but i know they now call it "enhanced DOD/AFM " I'll look some more----But the re deisign was for ALL GM cars and trks with AFM----including Corvettes
Most all the components were changed to address failures as well as issues concerning oil injestion into the intake manifold----The main change if I remember correctly was a new lifter design
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
I guess it could depend on your location but I would expect in the neighborhood of 500 for the cam and 20 hrs of labor at 80 per hr is 1600, leaves 400 for other stuff needed....3500 sounds ridiculous.
Of course if independent shop rates are 140 where you are then you are up there.
Of course if independent shop rates are 140 where you are then you are up there.