First dyno results
02-19-2007, 09:29 PM
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First dyno results
Why are lines so jagged and the power just drops off. Timing was at 24.5, a/f seems pretty good. how do i improve high end power to about 5800-6k rpm? How are these numbers compared to stock #'s? 
Last edited by Tahoe6.0; 02-19-2007 at 10:01 PM.
02-20-2007, 05:55 PM
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I do not have headers and i do have 33lb injectors installed that i forgot to mention. My thinking after talking with cam grinder and head guy was that 1400.00 for dynatech and y-pipe with high flow cats was not worth 10-15hp! plus I have had bad luck with headers 30 yrs ago and they were leaking, lose bolts all the time. I will install them if some one can tell me how much I'm losing with them! I'm going to install some cnc ported stage 2 heads and try to have Charlie change a/f and timing a little! Stock truck intake flows 280cfm i'm told and the 280cfm will make more hp than 297rwhp. Ive learned alot from this forum and please correct my old way's thinking! I need to get this figured out soon. It seems to never end!
02-20-2007, 07:03 PM
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The more you do on the intake side, the more that stock manifolds are going to kill your numbers. You don't have to use a $1400 set of headers, buy some pacesetters and y-pipe for 1/3 that price. When you swap out your heads i bet you will see at least 20hp from headers. An LS6 intake would definetly help out your top end power as well.
Were the pushrods in your sig recommended by the cam manufacturer or did you use a pushrod checker to find the length you needed? I just very rarely see any combo that needs something besided a 7.400" pushrod. Also that cam is awfully small for a N/A 6.0 in my opinion.
Also, don't let an experience from 30 years ago deter you from doing headers now. Thick flanges and better gaskets, along with locking header bolts will make them worry free.
Were the pushrods in your sig recommended by the cam manufacturer or did you use a pushrod checker to find the length you needed? I just very rarely see any combo that needs something besided a 7.400" pushrod. Also that cam is awfully small for a N/A 6.0 in my opinion.
Also, don't let an experience from 30 years ago deter you from doing headers now. Thick flanges and better gaskets, along with locking header bolts will make them worry free.
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02-20-2007, 07:31 PM
#8
Its just a poorly matched setup.
Ive got a similar cam single patterns are designed for use with a good exhaust. Id expect more to the tune of 30-40rwhp from lt's and an open exhaust with no cats.
If you want to keep the stock exhaust Id be swapping the cam for an ls6, lpe gt2-3 or the good ole 210/218.
The cam doesnt make sense to me. I think the duration and lift is fine but the ve's he's using dont add up. If it were on a 110/110 it would have made alot more power throughtout the rpm range.
Ive got a similar cam single patterns are designed for use with a good exhaust. Id expect more to the tune of 30-40rwhp from lt's and an open exhaust with no cats.
If you want to keep the stock exhaust Id be swapping the cam for an ls6, lpe gt2-3 or the good ole 210/218.
The cam doesnt make sense to me. I think the duration and lift is fine but the ve's he's using dont add up. If it were on a 110/110 it would have made alot more power throughtout the rpm range.
02-20-2007, 09:32 PM
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Originally Posted by adam1803
The more you do on the intake side, the more that stock manifolds are going to kill your numbers. You don't have to use a $1400 set of headers, buy some pacesetters and y-pipe for 1/3 that price. When you swap out your heads i bet you will see at least 20hp from headers. An LS6 intake would definetly help out your top end power as well.
Were the pushrods in your sig recommended by the cam manufacturer or did you use a pushrod checker to find the length you needed? I just very rarely see any combo that needs something besided a 7.400" pushrod. Also that cam is awfully small for a N/A 6.0 in my opinion.
Also, don't let an experience from 30 years ago deter you from doing headers now. Thick flanges and better gaskets, along with locking header bolts will make them worry free.
Were the pushrods in your sig recommended by the cam manufacturer or did you use a pushrod checker to find the length you needed? I just very rarely see any combo that needs something besided a 7.400" pushrod. Also that cam is awfully small for a N/A 6.0 in my opinion.
Also, don't let an experience from 30 years ago deter you from doing headers now. Thick flanges and better gaskets, along with locking header bolts will make them worry free.