Low Dyno #'s, need advice
05-23-2009, 09:41 PM
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Low Dyno #'s, need advice 2001 zo6
lg streets no cats b&b bullets
prc ls6 stage 1 ls6 heads
236/240 cam
clutch might have been slipping a very little amount, my tuner said he thinks the cam timing is off a little bit per the dyno graph. my power didn't start until 4200 rpm's and was pulling through 6800. the cam was supposed to be put in at 111 and was not degreed...
416/382 ???
lg streets no cats b&b bullets
prc ls6 stage 1 ls6 heads
236/240 cam
clutch might have been slipping a very little amount, my tuner said he thinks the cam timing is off a little bit per the dyno graph. my power didn't start until 4200 rpm's and was pulling through 6800. the cam was supposed to be put in at 111 and was not degreed...
416/382 ???
05-24-2009, 12:19 AM
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That does seem like low #'s for a non cat'ed ZO6 H/C setup.
What kind of dyno where you on?
Was a new timing chain used during the cam install?
You should degree the cam to make sure that's not the problem. If that comes out right put the stock 243 heads you replaced back on and see what it makes.
What kind of dyno where you on?
Was a new timing chain used during the cam install?
You should degree the cam to make sure that's not the problem. If that comes out right put the stock 243 heads you replaced back on and see what it makes.
05-24-2009, 10:04 AM
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i already sold my 243 heads....i put on a new ls2 timing chain during the install. it was on a dyno jet. how much can be attributed to the cam being out of timing? do i have too much cam for my head?
05-24-2009, 02:30 PM
#7
Why was the cam not degreed in? That could be it right there. Thats a big cam the power band sounds about right, it wont start kicking til the later rpms even with the 111.
I ran a 238/240 111 and it wouldnt kick until 4500 rpms then it would explode to 7000 rpms.
Degree the cam and then see that what you get. Were the heads milled at all? Big cam with ported OEM heads isnt the greatest for down low power either.
I ran a 238/240 111 and it wouldnt kick until 4500 rpms then it would explode to 7000 rpms.
Degree the cam and then see that what you get. Were the heads milled at all? Big cam with ported OEM heads isnt the greatest for down low power either.
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05-24-2009, 02:44 PM
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Why was the cam not degreed in? That could be it right there. Thats a big cam the power band sounds about right, it wont start kicking til the later rpms even with the 111.
I ran a 238/240 111 and it wouldnt kick until 4500 rpms then it would explode to 7000 rpms.
Degree the cam and then see that what you get. Were the heads milled at all? Big cam with ported OEM heads isnt the greatest for down low power either.
I ran a 238/240 111 and it wouldnt kick until 4500 rpms then it would explode to 7000 rpms.
Degree the cam and then see that what you get. Were the heads milled at all? Big cam with ported OEM heads isnt the greatest for down low power either.
Your right about the cam, it should make more power but will suffer on lowend compared to a smaller cam.
The cam should have been degreed but that's likely not the problem with the low #'s.
05-24-2009, 03:24 PM
#9
Not to argue but you can lose 20hp if the cam if off, its sometimes the only the reason why some combos identical to each other dont make the same power, ones making about 15-20 more than the other. What does retarding timing do?
I say degree the cam and then see what you get.
Tony Mamo has covered flow and runner sizes and results extensively in the sticky.
https://ls1tech.com/forums/generatio...ng-thread.html
I say degree the cam and then see what you get.
Tony Mamo has covered flow and runner sizes and results extensively in the sticky.
https://ls1tech.com/forums/generatio...ng-thread.html
05-24-2009, 03:36 PM
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see this is what pisses me off. no offense, great for you lol. our cams are pretty close, and on stock heads you are making 22 more at the wheels. lets just say my timing is way off, and i pick up 10 or 15 at the wheels, i'd still be less power than you and i have the prc ls6 heads. do those heads suck or something? they seemed like the best bang for the buck. i paid around 1400.00 for them with upgraded dual coil springs.
05-24-2009, 03:37 PM
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oh and i know the cam should have been degreed. long story short an opening came up at my tuners shop and i had to get my car done in time, i tried to get someone over here to do it but wasn't able to.
-Jason
-Jason
05-24-2009, 03:57 PM
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Not to argue but you can lose 20hp if the cam if off, its sometimes the only the reason why some combos identical to each other dont make the same power, ones making about 15-20 more than the other. What does retarding timing do?
I say degree the cam and then see what you get.
Tony Mamo has covered flow and runner sizes and results extensively in the sticky.
https://ls1tech.com/forums/generatio...ng-thread.html
I say degree the cam and then see what you get.
Tony Mamo has covered flow and runner sizes and results extensively in the sticky.
https://ls1tech.com/forums/generatio...ng-thread.html
05-24-2009, 04:04 PM
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If your off a tooth or so it would make a big differance. If it's installed dot-to-dot but is out a degree or two that wouldn't make too much of a differance. And it's not really that you have too much cam for the heads, your stock 243's would ave probably made more power.
05-24-2009, 09:20 PM
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see this is what pisses me off. no offense, great for you lol. our cams are pretty close, and on stock heads you are making 22 more at the wheels. lets just say my timing is way off, and i pick up 10 or 15 at the wheels, i'd still be less power than you and i have the prc ls6 heads. do those heads suck or something? they seemed like the best bang for the buck. i paid around 1400.00 for them with upgraded dual coil springs.
Sorry, I forgot, I have Livernois Stage 2 LS6 heads.
. challenge at street , my car pulled 390RWHP and beats 454rwhp 
these all in a dyno jet 
05-25-2009, 10:54 AM
#18
Degreeing a cam makes a huge difference. The grinder sends you a cam card for a reason, even the best grinders like comp and crane have a certain amount of error. Even if it is lined up dot to dot the intake centerline could be off which moves the valve events around. Talk to any engine builder, if you spend the money on an aftermarket cam, why cut corners to save 30 minutes.
05-25-2009, 11:00 AM
#19
As far as the heads go, when it said that they have seen gains as much as 50rwhp, that could be on a bigger cube motor, bigger cam, ect. Also what intake manifold are you running, looking at the dyno graph it looks like the motor is starving for air around 6200. It doesnt matter if the heads will flow over 300 cfm if the intake can only support 250 cfm.
05-25-2009, 12:07 PM
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Degreeing a cam makes a huge difference. The grinder sends you a cam card for a reason, even the best grinders like comp and crane have a certain amount of error. Even if it is lined up dot to dot the intake centerline could be off which moves the valve events around. Talk to any engine builder, if you spend the money on an aftermarket cam, why cut corners to save 30 minutes.