Comp cam XFI lobes vs btr, tsp, etc.
10-29-2017, 10:33 AM
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Comp cam XFI lobes vs btr, tsp, etc.
Hello. Long time browser first time poster here. So I have looked all over and can't really find much info pertaining to my question. Haven't gotten much from the vendors either. I am building a gen III 6.0 iron block engine that's going in a 5000lb daily driver. 2006 Silverado Crew cab. It will see the track but not much. More towing than track time. 2500-2800 yank stall, 4l60e with shift kit, vette servo, etc, 323 gears with posi unit, Fresh 799 heads, stock rebuilt bottom end, shorties, 30lb injectors, new stock lifters, reuse stock pushrods, and an aftermarket cam. Therein lies my question. I am looking at a 212/218 with .550ish cam. This should give me gobs of low end power and still have some top end. I've got the comp version on a 115 and a set of psi cylindrical springs with tool steel retainers which I'm not sure if I should use. The btr recommends 295 lbs of seat pressure(blue ls6 springs), while the comp needs 375 lbs. Is this because of the xfi lobes? Would I be better off keeping the heavy cylindrical springs & comp cam? I'm worried that if the springs are that stiff in comparison to the blue ls6 springs that I'll run into problems with longevity. I could be dead wrong to. Any info would be greatly appreciated
10-29-2017, 12:38 PM
#2
Btr uses a fairly soft older lobe for their truck cams. Youre missing out on at least 10-15 just due to your low lift and dated lobes...and that's not just peak power that would be gains over the entire range.
The xfi lobe isnt aggressive at all really but isnt bad.
Tsp lobes are the latest out and, from my experience, quieter and better than comparable lobes with the lift and ramp rate.
Those psi springs (if 1511) have a good amt of pressure and you can use them with no issue.
The xfi lobe isnt aggressive at all really but isnt bad.
Tsp lobes are the latest out and, from my experience, quieter and better than comparable lobes with the lift and ramp rate.
Those psi springs (if 1511) have a good amt of pressure and you can use them with no issue.
10-29-2017, 03:03 PM
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Btr uses a fairly soft older lobe for their truck cams. Youre missing out on at least 10-15 just due to your low lift and dated lobes...and that's not just peak power that would be gains over the entire range.
The xfi lobe isnt aggressive at all really but isnt bad.
Tsp lobes are the latest out and, from my experience, quieter and better than comparable lobes with the lift and ramp rate.
Those psi springs (if 1511) have a good amt of pressure and you can use them with no issue.
The xfi lobe isnt aggressive at all really but isnt bad.
Tsp lobes are the latest out and, from my experience, quieter and better than comparable lobes with the lift and ramp rate.
Those psi springs (if 1511) have a good amt of pressure and you can use them with no issue.
11-26-2017, 09:23 PM
#5
@RPMSpeed Tech
Quick question in regard to the TSP high lift package: does the upgrade affect emissions output, negatively in any way? There is so much discussion about cam shafts but I have never read where the issue of state smog testing is addressed. I know that a lot of guys juicing up their lifted daily drivers like to post up video clips and sigs with their highly modified intake & exhaust but at some point do you push the limits or fail a smog test altogether? I know you can't get away with deleting the catalytic converters and oxygen sensors where my truck is registered but what can I safely & legally get by with? Or is a valve train upgrade anything to worry about?
Quick question in regard to the TSP high lift package: does the upgrade affect emissions output, negatively in any way? There is so much discussion about cam shafts but I have never read where the issue of state smog testing is addressed. I know that a lot of guys juicing up their lifted daily drivers like to post up video clips and sigs with their highly modified intake & exhaust but at some point do you push the limits or fail a smog test altogether? I know you can't get away with deleting the catalytic converters and oxygen sensors where my truck is registered but what can I safely & legally get by with? Or is a valve train upgrade anything to worry about?
Last edited by Chubbs878; 11-26-2017 at 09:28 PM.
11-27-2017, 07:24 AM
#7
Will pac1218 with the .600 lift be fine with the TSP stage 2 HL cam or would it be wiser to have a little height buffer and go with .625 lift springs?
Last edited by capt_zman; 11-27-2017 at 08:07 AM.