Whats holding it back, view power graph
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
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From: Birmingham UK
You guys who suggested valve float might be barking up the right tree. I am going to swap the Comp 1.85's for stock, it will take the valve lift from .625 down to just under .580, so i dont know how thats going to effect it, but hopefully the valves staying shut might let it rev. I'll know by next weekend anyway. One of the sponsors on here said that it was classic valve float when he looked at the graph, The AFR going rich when the graph starts going wobbly is the unburnt gasses, makes sense when explained really.
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
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From: Birmingham UK
Used a dyno jet dyno today,and this was the result, the lower graph is my 383 with a comp 224 cam when i first installed the motor a year ago, The Dyno jet has a much bigger mass than the small roller dyno i have used in the previous graph on my present motor, This might "mask" the effect of valve float due to the much bigger inertia of the wheel, what do you guys make of it? If i install the standard rockers which i am waiting on how much do you think i'll lose? Given that lift will go down from .624 to around .580? I have a mile standing sprint this weekend so need as much as i can get but dont want to damage the motor. I am over in LA in November so will upgrade cam and intake then! 
Last edited by lstvr; Aug 5, 2008 at 03:05 PM.
FAST intake and some stock 1.7 rockers. You should be good. Cam makes some nice power in the mid-range.
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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
10 Second Club
Joined: Nov 2007
Posts: 458
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From: Birmingham UK
Thanks guys, i've ordered the rockers so can install before this weekend, i'll dyno and post so you can see, the rockers are the most cost effective and i am worried about float, so a no brainer, the rest of the goodies i'll get when i'm off to Vegas, thanks for the help guys. Bird 113Lsa
Thread Starter
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Joined: Nov 2007
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From: Birmingham UK
Well heres the result, i actually picked up low down torque! i suppose because its slightly flatter curve wise, it feels less? Its one colour but just follow the lines, you can see where the old rockers are done so i shut down, the standard ones keep going. But peak power is 10bhp less. What sort of cam do i need to make 500rwhp with new injectors and a fast? Your thoughts guys?
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Thread Starter
10 Second Club
Joined: Nov 2007
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From: Birmingham UK
I did the standing mile sprint today, the car revved so much better than it has ever done, it managed a speed of 179.5mph in 25.5seconds, it was on a runway so i carried on after the traps, my speedo which is damn accurate hit 200mph! It also gave me a first qtr at 10.99!!!
Thread Starter
10 Second Club
Joined: Nov 2007
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From: Birmingham UK
The boyz at Thunder have specced me a cam...242/254 .621/.595 XFi/3661 lobe, 114+3. I have exhaust constraints so they said this exhaust lobe will help me out. Piccy to show what i mean.
