Is a 550rwtq LS7 possible?
Is a 550rwtq LS7 possible? ok guys need help with cam selection and compression ratio on a 427 LS7. The car is destined to be street/auto-x TOY!!! Screw all the 600rwhp crap, i want TORQUE and lots of it, for accelerating out of the corners. I already have purchased some Diamond -3.84cc pistons, but what else do i need to achieve 550RWTQ??????? Is the compression ratio the key?
ok guys need help with cam selection and compression ratio on a 427 LS7. The car is destined to be street/auto-x TOY!!! Screw all the 600rwhp crap, i want TORQUE and lots of it, for accelerating out of the corners. I already have purchased some Diamond -3.84cc pistons, but what else do i need to achieve 550RWTQ??????? Is the compression ratio the key?
Torque is more of a function of displacement and compression. More of either will get you more torque. Porting heads, better bolt-ons and optimizing cam timing will increase torque to a certain extent, but very few hydraulic cammed motors in this size range exceed 1.25 times their displacement in rear wheel torque (that would be 534 rwtq). Typically, only a very high compression 427 with all the bases covered makes over 550 torque to the rear tires (assuming an honest dyno).
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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.
Joined: Jul 2005
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From: Texas, Europe, Iraq & Afghanistan
And, Patrick G., when you say "high compression," are you referring to static or dynamic. I ask, because it seems most non-force-inducted engines are limited to a dynamic compression of 9.0:1 on 93 octane.
Torque is more of a function of displacement and compression. More of either will get you more torque. Porting heads, better bolt-ons and optimizing cam timing will increase torque to a certain extent, but very few hydraulic cammed motors in this size range exceed 1.25 times their displacement in rear wheel torque (that would be 534 rwtq). Typically, only a very high compression 427 with all the bases covered makes over 550 torque to the rear tires (assuming an honest dyno).
ok guys need help with cam selection and compression ratio on a 427 LS7. The car is destined to be street/auto-x TOY!!! Screw all the 600rwhp crap, i want TORQUE and lots of it, for accelerating out of the corners. I already have purchased some Diamond -3.84cc pistons, but what else do i need to achieve 550RWTQ??????? Is the compression ratio the key?
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There's a thread with a couple LS7 heads/cam packages we've done. The second one in the thread, although it has more camshaft, makes better torque because of a little bump in compression mainly. Compression definitely helps!
There's a thread with a couple LS7 heads/cam packages we've done. The second one in the thread, although it has more camshaft, makes better torque because of a little bump in compression mainly. Compression definitely helps!
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Yes it can be done!
For your heads i suggest PRC LS7x 265cc CNC Heads or the 280cc. Talk to Patrick G about a cam. You can have a 12:1CR and thats about max on pump gas (93)
I am not sure you can get a 12:1CR with the -3.84cc pistons and the LS7x heads.
Goodluck, keep us posted!
For your heads i suggest PRC LS7x 265cc CNC Heads or the 280cc. Talk to Patrick G about a cam. You can have a 12:1CR and thats about max on pump gas (93)
I am not sure you can get a 12:1CR with the -3.84cc pistons and the LS7x heads.
Goodluck, keep us posted!
for the best power, ive seen the TFS 235's make the best. Ported LS7's can make 400 CFM, but no intake capable of capturing the potential. Until some badass LS3/7 stuff comes out. i think TFS235's/fast92mm ported is the key
Thanks for all the input guys, it's gonna take a few months to get it on the road, LS stuff aint cheap. I'll keep you guys posted on the progress
...pump gas or high octane what a dilemma....
...pump gas or high octane what a dilemma....
Torque is more of a function of displacement and compression. More of either will get you more torque. Porting heads, better bolt-ons and optimizing cam timing will increase torque to a certain extent, but very few hydraulic cammed motors in this size range exceed 1.25 times their displacement in rear wheel torque (that would be 534 rwtq). Typically, only a very high compression 427 with all the bases covered makes over 550 torque to the rear tires (assuming an honest dyno).
It's getting harder and harder to find an honest dyno around here. Too many people believing the BS numbers that are thrown out here so easily and the nut hangers piling on but I guess that's what sells. 550 on an honest dyno IS going to be hard and will take a very well designed high compression 12+:1 engine. It's probably not going to be something you'll drive around on the street.
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Joined: Mar 2006
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From: Rolesville, NC
Might be a challenge with an LS7 block. Several have tired and succeeded somewhat until the cylinder wall has blown out.
a C5R block, Warhawk or Dart Billet block would be a great starting place for that kind of power.
The C5R and LS7r blocks ( Corvette racing) run ~ 580 BHP and ~640 LBFT ( FLTQ)
a C5R block, Warhawk or Dart Billet block would be a great starting place for that kind of power.
The C5R and LS7r blocks ( Corvette racing) run ~ 580 BHP and ~640 LBFT ( FLTQ)
With a LS7 block and ~11.25 CR ported LS3 heads and LS3 intake you will get close to 550 rw tq and hp. (with the right cam). The LS3 heads seem to limit peak hp a bit but the hp/tq # come out about the same. LS7 heads with LS7 intake will make more hp but will not be as "square" re hp/tq.
So 550/550 rw is not difficult but will likely be more than you can use in 1st, 2nd and while cornering in 3rd gear. (AX)
The same engine with intake/carb will make much more hp but the hp gains are almost equal to torque loss.
So 550/550 rw is not difficult but will likely be more than you can use in 1st, 2nd and while cornering in 3rd gear. (AX)
The same engine with intake/carb will make much more hp but the hp gains are almost equal to torque loss.
Agreed, it's not that easy guys. If it was, everyone would be doing it and this thread wouldn't have been started!
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!