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LS7 Dyno Numbers

Old 03-22-2018, 10:40 PM
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Default LS7 Dyno Numbers

Im looking to see if anybody else can tell me if the numbers my car put down are adding up. I had a Ls7 built and put into my 02 WS6. I went with 285 prc heads. Texas speed stage 4.2 cam 248/260 .657/.655 111 LSA. With Holley sniper efi low profile 102mm intake manifold and throttle body. I was thinking it would be any where in the mid 500 to the low 600 range in power but my car only put down 476rwhp/412rwtq. Do these numbers sound right
Old 03-23-2018, 04:32 AM
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What is your transmission?
Old 03-23-2018, 10:35 AM
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Originally Posted by bigbomber5
What is your transmission?
stock t56
Old 03-23-2018, 02:02 PM
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Something is way wrong... Should make 600-650
Old 03-23-2018, 02:14 PM
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Originally Posted by Mavn
Something is way wrong... Should make 600-650
I know it’s not adding up cuz the exhaust isn’t gonna give me the 100rwhp that should be there
Old 03-23-2018, 02:47 PM
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What kind of dyno?
Old 03-23-2018, 03:38 PM
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Originally Posted by Tuskyz28
What kind of dyno?
dynojet using hptuners
Old 03-23-2018, 04:22 PM
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He has another thread in it. Imo its the exhaust.
Old 03-23-2018, 04:29 PM
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Originally Posted by Darth_V8r
He has another thread in it. Imo its the exhaust.
what do you mean? I did 2 threads to see if anybody had any idea
Old 03-23-2018, 04:43 PM
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I don't mean anything at all other than my opinion the exhaust as listed out in the other thread is holding it back and I apologize if the post looked snarky. It was unintentional if it did
Old 03-23-2018, 04:46 PM
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Originally Posted by Darth_V8r
I don't mean anything at all other than my opinion the exhaust is holding it back and I apologize if the post looked snarky. It was unintentional if it did
that was my fault man I was trying to read and drive at the same time. I didn’t understand what you were saying and I ordered the Texas speed true duals with the panhard relocation so hopefully that’ll help I may change out my air box lid to the ftp 104mm and the 100mm maf and see what happens
Old 03-25-2018, 04:41 AM
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Originally Posted by Brentoluke
......Texas speed stage 4.2 cam 248/260 .657/.655 111 LSA.......car only put down 476rwhp/412rwtq. Do these numbers sound right
What's your compression ratio?

KW
Old 04-02-2018, 01:37 AM
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You can tell if it's on the intake side by looking at what your vacuum is under WOT. It should be really close to atmospheric. Within 1-3kPa usually.
Old 04-02-2018, 08:42 AM
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Just seems like a miss matched combo. The intake was my first clue to it not being well though out.
Old 04-02-2018, 09:31 AM
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Originally Posted by hellbents-10
Just seems like a miss matched combo. The intake was my first clue to it not being well though out.

Me as well. On both thoughts.


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