XFI Cam Question
12-12-2017, 02:28 PM
#1
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XFI Cam Question Anybody have any feedback on this Comp cam- XR275HR/54-426-11...
Have a chance to purchase this at a fairly reasonable price. May be using it in a flat top 5.3 or stock LQ4 6.0...
Appreciate any feedback on manners, lobes, idle?
Have a chance to purchase this at a fairly reasonable price. May be using it in a flat top 5.3 or stock LQ4 6.0...
Appreciate any feedback on manners, lobes, idle?
12-14-2017, 12:27 AM
#5
TECH Fanatic
I'm running the bare minimum LS6 springs with mine and they seem to work just fine and I rev it to the moon! The valvetrain is just as quiet as stock. These are gentle lobes that work great for a daily driver.
the 275 will be fairly aggressive in a 5.3, a little tamer with more displacement if you go 6.0.
tuning is paramount with any cam upgrade. With good tuning this cam will idle and drive just fine.
12-14-2017, 12:42 AM
#6
TECH Senior Member
What's the duration @.050", lift, and LSA?
12-14-2017, 09:36 AM
#7
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that's a great cam. I'm running the XR265HR/54-424-11 in my 4.8 LR4. It is cut on the same (high lift) lobes as the 275, but has less duration and overlap which is perfect for my little 4.8.
I'm running the bare minimum LS6 springs with mine and they seem to work just fine and I rev it to the moon! The valvetrain is just as quiet as stock. These are gentle lobes that work great for a daily driver.
the 275 will be fairly aggressive in a 5.3, a little tamer with more displacement if you go 6.0.
tuning is paramount with any cam upgrade. With good tuning this cam will idle and drive just fine.
I'm running the bare minimum LS6 springs with mine and they seem to work just fine and I rev it to the moon! The valvetrain is just as quiet as stock. These are gentle lobes that work great for a daily driver.
the 275 will be fairly aggressive in a 5.3, a little tamer with more displacement if you go 6.0.
tuning is paramount with any cam upgrade. With good tuning this cam will idle and drive just fine.
Let me look, I'll get back here with it.
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12-14-2017, 11:38 AM
#9
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I would bet TSP has a cam VERY similar to that BUT would be much easier on the valvetrain.
12-14-2017, 12:57 PM
#11
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CattleAc, I am not a cam expert by any means, but this might just be the cam you are looking for. Especially if you have it.
Since you didn't mention the vehicles involved, just going by the motors mentioned, I will assume this is going in a truck. Since most trucks are automatics, this cam might be considered on the outer fringe of compatibility with OEM torque converters. The 5.3 more so than 6.0. This cam, while hardly a strip cam, has enough duration to be considered a performance cam as compared to a torque cam. With an advertised operating range maxing out at 6800, you must realize the torque you give up down low to have those capabilities. You would have to be the judge of whether or not you plan to play way up there. You can go to the Texas Speed website and see dyno graphs of different cams to see where you gain and lose power compared to your stock cam. It is fairly enlightening.
Once again, I will state that I am not a cam expert, but compared to the many cams offered today, that cam really doesn't seem to have very high lift, or harsh lobes. There are street cams available that produce .650 total lift with ramp rates under 50 degrees from .006-.050. This particular cam has .560 lift in 53 degrees of duration in same scenario. I understand there is more to lobe profile than those specifications, but that info isn't readily available.
To me, this cam would be ideal for a car with a standard tranny, or a car/street truck with a modern A4-A6 with a low first gear and something steeper than highway gears or a bit of a stall.
Since you didn't mention the vehicles involved, just going by the motors mentioned, I will assume this is going in a truck. Since most trucks are automatics, this cam might be considered on the outer fringe of compatibility with OEM torque converters. The 5.3 more so than 6.0. This cam, while hardly a strip cam, has enough duration to be considered a performance cam as compared to a torque cam. With an advertised operating range maxing out at 6800, you must realize the torque you give up down low to have those capabilities. You would have to be the judge of whether or not you plan to play way up there. You can go to the Texas Speed website and see dyno graphs of different cams to see where you gain and lose power compared to your stock cam. It is fairly enlightening.
Once again, I will state that I am not a cam expert, but compared to the many cams offered today, that cam really doesn't seem to have very high lift, or harsh lobes. There are street cams available that produce .650 total lift with ramp rates under 50 degrees from .006-.050. This particular cam has .560 lift in 53 degrees of duration in same scenario. I understand there is more to lobe profile than those specifications, but that info isn't readily available.
To me, this cam would be ideal for a car with a standard tranny, or a car/street truck with a modern A4-A6 with a low first gear and something steeper than highway gears or a bit of a stall.
12-14-2017, 04:04 PM
#12
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CattleAc, I am not a cam expert by any means, but this might just be the cam you are looking for. Especially if you have it.
To me, this cam would be ideal for a car with a standard tranny, or a car/street truck with a modern A4-A6 with a low first gear and something steeper than highway gears or a bit of a stall.
To me, this cam would be ideal for a car with a standard tranny, or a car/street truck with a modern A4-A6 with a low first gear and something steeper than highway gears or a bit of a stall.
EDIT: I have a forged flat top 6.0 on the stand waiting to go in. Maybe this would be a good cam to experiment with since it's gonna' almost be a freebie...???
12-14-2017, 04:09 PM
#13
TECH Senior Member
Good idea; more displacement makes any cam more forgiving as far as drivability.
12-14-2017, 11:14 PM
#14
I have the HR- 277 224/228 112 in my LS6. Good cam, fairly mild lobe...mine is the low lift designed for higher ratio rockers. I went that route since I already had SLP 1.85 ratio stock style rockers. It pulls like a banshee to 7200 rpm with my ported 92 and TEA LS6 heads. Makes good power everywhere. Honestly does not feel like I gave up anything down low. Compression bump probably contributes to that.
That 222/224 should work great in a 5.3 and make good average power.
That 222/224 should work great in a 5.3 and make good average power.