Tech experts I need your help please
The missing data comes for a poor connection on the pickup wire. On your first dyno, the curve looks good until 6000 rpm, then it falls off pretty fast. The second dyno looks much cleaner. The power drops off much more gradually. With your early power and torque peaks, I would expect your cam to be installed at a fairly advanced intake centerline. Do you know what it is?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
Staging Lane
Joined: May 2005
Posts: 82
Likes: 0
From: South FL
Originally Posted by Patrick G
The missing data comes for a poor connection on the pickup wire. On your first dyno, the curve looks good until 6000 rpm, then it falls off pretty fast. The second dyno looks much cleaner. The power drops off much more gradually. With your early power and torque peaks, I would expect your cam to be installed at a fairly advanced intake centerline. Do you know what it is?
Is is bad that the power drops off after 6000rpm? the tuner said something about maybe its the valve spring???? maybe one is kinda weak?
shift points are around 6000rpm i believe, should they be set higher?
the tuner even put more timing in there to see what happens after 6000rpm, same thing but the peak was 396 hp, so more timing didnt help.
is this something i need to have checked out more or worry about?
heads are MTI stage2E milled .05
thanks again.
I don't know. Dyno run number 4 looks cleaner than 3. Power doesn't drop off as fast. What springs are you running? Any shims in them? The Stealth II uses very fast ramps and needs lots of spring pressure to pull high rpm.
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Thread Starter
Staging Lane
Joined: May 2005
Posts: 82
Likes: 0
From: South FL
Originally Posted by Patrick G
I don't know. Dyno run number 4 looks cleaner than 3. Power doesn't drop off as fast. What springs are you running? Any shims in them? The Stealth II uses very fast ramps and needs lots of spring pressure to pull high rpm.
These are the heads. They came with quality parts.
patrick, thanks for all your help so far.
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