[Z06] Dyno numbers low? 535whp 485trq btr4
04-24-2017, 07:05 PM
#22
Team Owner
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CammedC6520 (04-24-2017)
04-24-2017, 07:24 PM
#24
Team Owner
Power falling off at 6350 rpm with that size cam sounds early to me. I see BTR 3, K501, etc builds that are still making power well past that. To me, it sounds like your OE manifold is choking the motor. Again, without the graph I don't know if its severely falling off or just slightly tapering off...
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CammedC6520 (04-24-2017)
04-24-2017, 07:34 PM
#25
Drifting
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Power falling off at 6350 rpm with that size cam sounds early to me. I see BTR 3, K501, etc builds that are still making power well past that. To me, it sounds like your OE manifold is choking the motor. Again, without the graph I don't know if its severely falling off or just slightly tapering off...
I'll keep my mouth shut and wait for the graph.
04-24-2017, 10:30 PM
#26
Burning Brakes
Do cats really affect the HP and TQ that much? My car is at AHP right now getting their #4 heads, ported, polished, milled, long tube headers, x pipe with high flow cats, exhaust and dyno tune. I was told awhile ago by a lot of people on here that going with no cats might only get you about 5 HP over high flow cats so I chose high flow cats. Are high flow cats at risk of becoming clogged up and affecting performance?
04-24-2017, 10:32 PM
#27
Team Owner
Good functioning cats, no problem. Clogged cats can destroy a motor quickly.
04-24-2017, 10:40 PM
#28
Burning Brakes
04-24-2017, 10:55 PM
#29
Race Director
I have high flow catted X-pipe on my build and it is fine. Most K501 cams peak around 66-6700 rpm for HP. The BTR4 cam is at least as strong as the K501 so peak should be up there as well. Mine with MSD/NW102 peaked at 7100 rpm and had low torque but held it well.
04-24-2017, 11:31 PM
#31
Team Owner
04-25-2017, 12:08 AM
#33
Melting Slicks
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CammedC6520 (04-25-2017)
04-25-2017, 12:13 AM
#34
Drifting
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I thought it didn't matter much ls7 lifters have a wide range I'll get Abel at Chevrolet to check the preload for me maybe I did it wrong. If I change pushrods do I need a new tune?
04-25-2017, 12:16 AM
#35
Melting Slicks
I said nothing about the pre-load... how did you get "check the preload" out of me saying your cam could be a tooth off which would cause reduced power, but not necessarily be far enough off to throw a code.
When you put the cam in were you dot to dot on the gears? Did you spin the motor over completely a few times to make sure the dots re lined up?
When you put the cam in were you dot to dot on the gears? Did you spin the motor over completely a few times to make sure the dots re lined up?
04-25-2017, 12:21 AM
#36
Drifting
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I said nothing about the pre-load... how did you get "check the preload" out of me saying your cam could be a tooth off which would cause reduced power, but not necessarily be far enough off to throw a code.
When you put the cam in were you dot to dot on the gears? Did you spin the motor over completely a few times to make sure the dots re lined up?
When you put the cam in were you dot to dot on the gears? Did you spin the motor over completely a few times to make sure the dots re lined up?
04-25-2017, 12:29 AM
#37
Melting Slicks
so you didnt answer my question about being dot to dot when you installed the cam.
Or do you even know or remember?
Or do you even know or remember?
Did you install the cam? If so did you line up the timing marks on the gears?