Low Dyno #'s, need advice

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May 25, 2009 | 12:29 PM

#21

99blancoSS

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From: ST Helens, OR

We've seen 20hp difference between a properly degreed cam and one thats off. We've seen a cam as much as 8* off before.

May 25, 2009 | 12:35 PM

#22

Old SStroker

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From: Upstate NY

Quote:

Originally Posted by Mystic97z

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.

There are varying opinions on what is the "best bang for the buck" on LS engines. IMO, the best designed and executed combination for a given amount of bucks is the "best bang".

Remember that it's all about your combination. As was pointed out, 243s are very good heads with decent port volume. With just a little work and a very good valve job they consistently make great power and torque, especially combined with a well-matched cam.

It all comes down to if you are happy with how your combination performs. If you are trying to make a peak hp dyno-queen, then look for combinations that do that. If you are trying to make a quick, drivable street/strip car then you might look for "max area under the torque curve" combinations. 30 lb-ft extra at 3000 can make a car quicker than 15-20 more peak hp, but the dyno "bragging rights" might not be there.

Don't believe everything you read (including this post) without corroborative evidence.

Caveat emptor!

FWIW: Heads that encourage efficient "sucking" are good ones.

Jon

May 25, 2009 | 12:41 PM

#23

WS6RED2002TA

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From: Hinesville, GA

Your numbers do seem low. Have you checked to make sure your TB blade is opening all the way.

May 25, 2009 | 12:45 PM

#24

99blancoSS

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From: ST Helens, OR

Quote:

Caveat emptor!

FWIW: Heads that encourage efficient "sucking" are good ones.

Jon

good one!

May 25, 2009 | 02:51 PM

#25

CamaroSS22

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it really doesnt seem to be that down on power, every car is different. The clutch slipping could also make a difference. It could just be a few little things.

May 25, 2009 | 02:53 PM

#26

CamaroSS22

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i dont think the drive by wire vettes had a problem with the blade not opening all the way.

May 25, 2009 | 07:51 PM

#27

willyfastz

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Quote:

Originally Posted by 99blancoSS

We've seen 20hp difference between a properly degreed cam and one thats off. We've seen a cam as much as 8* off before.

And that's why I degree all the cams I do. I bet if the OP degrees the cam he'll only find a degree or so and that will most likely be from the LS2 timing chain.

Also the graph he posted isn't in SAE so the #'s are going to be slightly lower than the posted #'s. For that size cam and PORTED LS6 heads it's deff. low #'s.

May 25, 2009 | 08:27 PM

#28

Fbodyjunkie06

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From: Greensboro, NC

What does the A/F ratio look like I can barely read it on that chart...your clutch slipping could also be the reason for the power loss. I would degree the cam again just to make sure that it was properly installed. All dyno's are also different...