Engine builders inside***Want to build a low torque/high peaky hp LS3 416ci
02-09-2010, 09:04 PM
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Engine builders inside***Want to build a low torque/high peaky hp LS3 416ci Sounds crazy I know...I want to build a 416LS3 and try to limit the low rpm torque hit while making the rev range and hp peaky(7000rpm or so) while keeping idle quality within reason.. Reason being its going into a 2300lb car and too much torque down low will be a hand full. Here's what I was thinking.. 416LS3 with 12/1 compression, TrickFlow 235 CNC heads, cam(rough idea) around 236 intake and 240 exhaust .600ish lift set on a 118LSA..Add to that Edlebrocks Pro-Flo XT tunnel ram intake or sheet metal intake and Kooks 2" primary headers..
Throw any ideas out there..
Thanks
Throw any ideas out there..
Thanks
02-10-2010, 11:16 AM
#2
Short runner intake will definitely help soften the low rpm torque while boosting the topend power. Cam choice will totally depend on what manifold you chose. Choose your cam and pushrods last.
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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.
02-11-2010, 03:46 PM
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Pull lots of timing down in the lower RPM's if it makes too much low end torque, or up the torque management settings. Why solve with hardware what you can solve with software? But, with 12:1 CR and that many cubes, its gonna have alot of torque.
02-14-2010, 07:02 AM
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416 is great for tq, To get it to make power up top id run a victor junior, if u run a wide lsa cam late ICL low overlap it will force its peak past the manifolds and basically ruin low end and not get the top end you desire.
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02-14-2010, 12:31 PM
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Not really a budget build. I'm also considering an LS7 block for the build..Going to put the engine in one of these..Picked up my kit and 2002 Vette donor car last weekend..
Last edited by chriswtx; 02-14-2010 at 12:42 PM.
02-15-2010, 01:03 PM
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Keeping the 2004 unless someone makes a good offer.. I picked up a new LS3 block this weekend. Want to keep it N/A.. Turbo would be too much HP is such a light car. It would take the fun out of driving a car like this..
02-15-2010, 09:42 PM
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A shorter stroke would be MUCH better for your goals. Lower torque, higher revving, and a better rod ratio with lower bearing speeds. A 416 is a bad starting point IMO. Stick with a stock LS2 or LS3 crank.
02-17-2010, 09:29 AM
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How does that work? Better rod ratio = shorter stroke, longer rod vs shorter (or same) rod with a longer stroke. Decreases rod angle and bearing speeds, and allows the motor to safely rev to a higher rpm, and last longer doing it. The stock crank/ rod combo results in almost a 1.7:1 rod ratio, where as the (4") stroker crank comes up closer to 1.5:1.
02-18-2010, 01:11 PM
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02-18-2010, 01:46 PM
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Wasn't already made, just talked to my tuner a couple of days ago and then made up my mind..I'm not against short stroke motors. I have one in my 91' Vette, destroked 400ci block 379ci motor, short stroke big bore..
02-18-2010, 01:59 PM
#19
Is that a factory five? Those things are sharp, I've considered one for a bit now. We're doing a 457 engine for an SL-C (2100 lbs) right now. He wasn't real concerned with the low and mid range tq being to much but wanted to limit the rpm to prolong valve-train components.
At those cars weights a stock LS1 would suffice
good luck with the project, should be fun !
At those cars weights a stock LS1 would suffice
good luck with the project, should be fun !