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Grand Sport Dyno Results... or "I'll show you mine if you show me yours!"
Please email your Grand Sport C4 & C6 (LT4 & LS3) dyno submissions to info@grandsportregistry.com. Be sure to include a short description of the car including it's major modifications, make of dyno machine, dyno facility name, date of dyno test, plus a digital scan or image of your dyno graph, if one is available.
Of course we trust you... but no bragging rights without the dyno graph!
Keep in mind the numbers shown here reflect REAR WHEEL horsepower and torque, as reported by various dyno facilities. While factors such as environmental conditions, dyno manufacturer, and technician expertise (or lack thereof) can vary results considerably, a general rule of thumb is to divide these numbers by 0.85 to approximate horsepower and torque at the flywheel, also known as Gross HP. This allows for a commonly accepted 15% parasitic loss from the drivetrain. For example, a car which dynos at 300 HP at the rear wheels (RWHP) is probably making close to 353 HP at the flywheel. Big difference!
For comparison purposes, the 1996 Grand Sport Corvette with LT4 engine was factory rated at 330 HP gross (at the flywheel), although in reality most 1996 LT4's in good condition generate closer to 350 HP. It has long been believed that GM intentionally *underrated* the 1996 LT4 so as not to take the spotlight away from the new 1997 C5 LS1 engine, rated at 345 HP. The 2010-2013 C6 Grand Sports with LS3 engine were rated at 430 HP (436 HP with the optional NPP exhaust system). Again, deduct 15% from these figures for the approximate rear wheel horsepower.
Click on the icon for a dyno graph, if one is available
LS3 (2010 - 2013) DYNO RESULTS
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RWHP |
RWTQ |
GRAPH |
VEHICLE |
OWNER |
FACILITY/DATE |
MODIFICATIONS |
732 |
639 |
n/a |
2010 GS |
Rich Shuleski |
Dynojet - East Coast Supercharging, Cream Ridge, NJ (Dec 2012) |
LS3 with Edelbrock E-Force supercharger, ported heads, racing cam, Akrapovic exhaust with carbon fiber tips, custom tune by LG Motorsports. |
656 |
594 |
|
2012 GS |
Joe Betras |
Dynojet - LG Motorsports, Wylie, TX (Nov 2011) |
LS3 with ECS blower Kit, ECS Meth kit, Factory ZR-1 cam, Z06 fuel pump w/bap, Pfadt headers, custom tune. |
620 |
648 |
n/a |
2011 GS |
Joe Polai |
Mustang Dyno (Dec 2012) |
LS3 with Edelbrock E-Force supercharger, long tube headers w/high hlow cats & X-pipe, custom tune, GT9 (Lingenfelter) cam 2.75" supercharger pulley, C5R timing chain, Hurst close ratio shifter. |
563 |
551 |
|
2011 GS |
Joe Polai |
Dynojet - Jerry's Chevrolet, Beresford, SD (Sep 2011) |
LS3 with Edelbrock E-Force supercharger, long tube headers w/high hlow cats & X-pipe, custom tune. |
530 |
496 |
|
2010 GS |
John "Hutch" Hutchinson |
Dynojet - Corvette Masters, Orlando, FL (May 2011) |
Stock LS3 with NPP exhaust and Edelbrock E-Force supercharger and custom dyno tuning by Jeremy Formato. |
476 |
476 |
|
2011 GS |
Josh Klapow |
DynoJet WinPep 7 - Legendary Motors, Trussville AL (Apr 2017) |
LS3 with Edelbrock E-Force supercharger, ported heads, custom tune by Scott Culbert |
461 |
432 |
|
2011 GS |
Phil Souza |
Dynojet - Street to Sand Performance, Reno, NV (Dec 2014) |
LS3 with Dynatech headers, Competion cam, push rods, valve springs, SPL cold air intake, custom tune. |
431 |
n/a |
|
2010 GS |
James Shoop |
Dynojet - Jerry's Chevrolet, Beresford, SD
|
LS3 with Melrose headers, Airaid air intake, x pipe, high flow cats. |
380 |
424 |
|
2010 GS |
John "Hutch" Hutchinson |
Dynojet - Corvette Masters, Orlando, FL (Mar 2011) |
Totally stock LS3 with NPP exhaust |
LT4 (1996) DYNO RESULTS
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RWHP |
RWTQ |
GRAPH |
VEHICLE |
OWNER |
FACILITY/DATE |
MODIFICATIONS |
504 |
516 |
|
96 GS #891 |
Brian Yates |
Dynojet - Back Street Performance (Aug 2004) |
396 stroker, ATI P1SC w/10lbs, intercooler, 58mm TB, port matched heads w/2.02 and 1.60 valves, 42lb. injectors, MSD 6AL, Crane 222/230 cam w/.542 and .563 lift, 9 to 1 JE/SRP pistons, Callies crank, Eagle rods, McLeod dual disc clutch w/aluminum flywheel, 1 3/4" long tube coated headers, flowmaster exhaust, D1SC supercharger with a Reichard Racing Ultra Grip pulley |
463 |
472 |
|
96 GS #387 |
Aaron Hancock |
DynoJet - More Performance, Charlotte, NC (Mar 2004) |
396 stroker + ATI Procharger @ 6lbs boost. Hooker shorty headers, gutted stock cats, Borla exhaust w/o resonator. More HP expected with the upcoming addition of long tube headers. |
459 |
436 |
|
96 GS #977 |
Mike Moray |
Dynapak - Aikman Performance, Cedar Park, TX (Feb 2015) |
383 stroker, Lunatti rods & crank, SRP pistons, GM 847 cam, Comp 1.6 roller rockers, ported LT4 heads, Lingenfelter TB, Melrose headers, Spec aluminum flywheel, ATI balancer. |
447 |
467 |
|
96 GS #891 |
Brian Yates |
Dynojet - Auto Assets (Nov 2003) |
396 stroker, ATI P1SC w/10lbs, intercooler, 58mm TB, port matched heads w/2.02 and 1.60 valves, 42lb. injectors, MSD 6AL, Crane 222/230 cam w/.542 and .563 lift, 9 to 1 JE/SRP pistons, Callies crank, Eagle rods, McLeod dual disc clutch w/aluminum flywheel, 1 3/4" long tube coated headers, flowmaster exhaust, dyno tuning with Norris Motorsports, Ocoee, FL |
441 |
416 |
|
96 GS #340 |
Robert Velasco |
Dynojet Research (Jan 2007) |
Engine: 383, GM847 cam, LPE LT4 CNCed heads, LPE LT4 ported intake, ASM 58mm TB, Long tube headers, 3" exhaust with x-pipe |
409 |
398 |
|
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Corvette Masters, Maitland, FL (Apr 2006) |
396ci LT4 stroker motor, bullet cats replaced with straight pipes with Powereffects exhaust OPEN and Jeremy Formato dyno tune. Note: Max power with Powereffects CLOSED was 386 RWHP. Max RWHP achieved was 419 but backed off for drivability. |
407 |
386 |
|
96 GS #340 |
Robert Velasco |
Dynojet - Woodbridge Dynotech (Jun 2005) |
SDPC 383 short block, LPE/SDPC Stage III heads, GM 847 cam, LPE LT4 manifold, ASM 58 TB, 1000 CFM MAF, cold air box, EM long tubes, 3 inch Magnaflow cats, 3 inch pipes, 3 inch Power effects mufflers. Picked up 14 rwhp going from 2.5 to 3 inch exhaust |
407 |
396 |
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96 LT4 |
Dan Linger |
Dynojet - G-Force Motorsports, Houston, TX
(Mar 2007) |
Procharger, K&N Filters, forced air induction, Hooker shorty headers, dyno tech. high flow cats, B&B Tri Flo exhaust, 42# injectors |
402 |
404 |
|
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Next Level Performance, Altamonte Springs, FL (Apr 2009) |
396ci LT4 stroker motor, Powereffects open, dyno tune by Jim Smith. Swapped back to smaller Crane 222/230 cam for improved drivability. |
398 |
424 |
|
94 LT1/4 |
Mark Bass |
Dynojet - MTI Racing, Marietta, GA
(Oct 2008) |
1994 Corvette, LT1 to LT4 kit with GM Hot Cam, 58mm TB, Hooker shorty headers, 30lb fuel injectors, Nitrous. Run #1 naturally aspirated (303HP, 307TQ). Run #2 with 125HP NOS shot. |
397 |
375 |
n/a |
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Norris Motorsports, Altamonte Springs, FL (May 2005) |
Initial quick-n-dirty tune following bore & stroke to 396 ci. Many new mods including forged crank, rods, pistons, Comp 306 cam, 58mm TB, Granatelli MAF, Meziere HD elec water pump, freshened CNC heads, port matched intake, aluminum flywheel, stage 2 clutch, MSD 6AL, Random Tech (ceramic) bullet cats, Jim Smith Dyno Tune. |
379 |
345 |
|
96 GS #468 |
Cary Rosenthal |
Dynojet - FordSpeed.com (Mar 2004) |
4.10 Viper Gears, K&N Filter& Open Lid, TB Bypass, Stock TB bored to 52mm,
Meziere Electric Water Pump, Exotic Muscle Long Tube Headers, No Cats,
Corsa Cat Back Exhaust, Holley Adjustible Fuel Pressure Regulator,
GM Hot Cam, Extreme Duty Timing Chain, Ported Heads, Matched Intake,
Impala SS Head Gasket, Crane Gold 1.6 Roller Rockers, 160 degree stat |
366 |
? |
|
96 GS #104 |
Lon Barnaby |
Formato/Fasterproms Clearwater, FL (Jun 2019) |
Express Engines Deland FL rebuilt to 383 cu in using Scat rotating assy; Balanced with flywheel; Comp Cams roller cam-lifters-beehive springs; Mahle rings; ARP bolting; Fidanza alum flywheel; Prat pushrods; High capacity oil pump; BBK 58mm throttle body; 42# Delphi injectors; Cloyes timing set; Performance valve job; McLeod Street Pro #75118 clutch/pressure plate; ORIGINAL Items - air filter, heads/valve rockers; axle ratio; & exhaust headers through mufflers |
364 |
367 |
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1996 LT4 |
Trevor Finley |
Dynomite - Gramajo Speed Shop, Broken Arrow, OK (Jul 2021) |
Hooker Super Competition Long Tube Headers, X-Pipe, Custom 3 inch exhaust, Open Airbox Lid, K&N Air Filter, 180 Stat, Descreened MAF, Mystery Tune (ECU locked from previous tune with previous owner)
|
364 |
349 |
|
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Norris Motorsports, Ocoee, FL (Nov 2001) |
PowerEffects exhaust, K&N, 52mm throttle body, Crane 222/230 cam, new Taylor plug wires, 30# injectors, full length TPIS headers, and Random Tech bullet cats. Dip in power ~5700 RPM was caused by a valve adjustment problem (springs were way too loose, causing the start of valve float at upper RPMs. Never redynoed after fix.) |
362 |
346 |
|
96 GS #470 |
Todd Emanuel |
Doug Rippie Motorsports (Jul 2003) |
Hot Cam, TPIS longtubes, no cats, Corsa, AFPR, K&N/open lid, 52mm BBK TB, dyno tuning by Doug Rippie |
355 |
n/a |
n/a |
96 GS #074 |
Jack Worley |
n/a |
Hot Cam and shorty headers |
354 |
352 |
|
96 GS #340 |
Robert Velasco |
Dynojet - Springfield Motorsport (May 2002) |
Shorty headers and stock GM cats (long tubes and no cats pulled 357 RWHP - 342 TQ) |
353 |
n/a |
n/a |
96 GS #977 |
Mike Woods |
n/a |
BBK 52mm throttle body, adj fuel pressure regulator, X pipe in stock exhaust (big difference, picked up 15 RWHP), tuning by Ed Wright |
349 |
324 |
|
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Vinci Hi-Performance, Orlando, FL (Apr 2001) |
Hooker shorty headers, PowerEffects exhaust, K&N, 52mm throttle body, Crane 222/230 cam and new plug wires (Picked up 15+ HP with the new cam but an odd dip at 5600 RPM) |
348 |
336 |
|
96 LT4 |
Chris Jones |
DynoJet - Carolina Auto Masters (Aug 2007) |
1996 Corvette LT4, Magnaflow catback, Descreened MAF, Throttle body coolant bypass, 4.10 gears, K&N and open air lid, and LT4 Hotcam. This dyno graph has the before cam and after cam pulls for comparison. |
344 |
334 |
|
96 GS #470 |
Todd Emanuel |
Dynojet - John Haley Motorsports (Jun 2002) |
Hot Cam, TPIS longtubes, no cats, Corsa, AFPR, K&N/open lid, 52mm BBK TB |
342 |
338 |
|
96 LT4 |
George Sommer |
Dynojet - Finish Line Performance (Jul 2002) |
Corsa exhaust, SLP triple tree air cleaner, 160 stat, Hypertech program, 4.09 Gears, Hot Cam, Hooker 2149 longtube Headers, 52mm BBK throttle body, Magnecore wires, NGK plugs, severe duty timing chain and custom programmed PCM |
340 |
341 |
|
96 LT4 |
Larry Crivello |
Mustang Dyno - Performance Motorsport, St James, NY (Mar 2008) |
1996 C/E LT4, 4.10 gears, Triflow 3” exhaust, Exotic Muscle long tubes, Vortex cold air, Granitelli mass air, high pressure fuel reg, alum. Flywheel, Jet stage 2 Pwr Module |
334 |
329 |
|
96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Vinci Hi-Performance, Orlando, FL (Feb 2001) |
Hooker shorty headers, PowerEffects exhaust, K&N, 52mm throttle body, CNC LT4 Heads, CNC LT4 intake, 210/224 Comp Cam, Ed Wright PCM, 4.10 gears, BPP Vortex air intake and random tech catalytic converters |
333 |
343 |
|
96 GS #859 |
Ken Woodcock |
Dynojet - Bradys High-Performance, Willow Street, PA (Mar 2011) |
Exotic Muscle long tube headers, Random tec high flow cats, Corsa cat back exhaust, 180 stat, Open Air lid and K&N filter |
333 |
320 |
|
96 GS #074 |
Robyn Stangel |
Dynojet - Auto Repair Specialties - Gresham, OR (May 2012) |
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331 |
331 |
|
96 GS #007 |
Jim Mason |
Dynojet - Dynotech Motorsports |
Open Air Filter Lid + K&N filter, 52mm throttle body, Flowmaster cat-back exhaust, Hooker Ceramic Coated Shorty Headers, Mild Porting of the Intake manifold (made 300 RWHP - 301 TQ stock). |
328 |
348 |
|
91 LT1/4 |
Alton "Tuna" Dobbins |
Mustang Dyno - HP Racing Equipment, OKC, OK (Feb 2004) |
92 LT1 with LT4 Heads, LT4 Intake, LT4 Hot Cam, 1.6 roller rockers, Ed Wright (FastChips.com) chip, 160 stat, stock induction w/ K&N filter, Corsa cat back exhaust. |
326 |
327 |
|
96 LT4 |
Chris Jones |
DynoJet - Carolina Auto Masters (Jan 2007) |
1996 Corvette LT4, Magnaflow catback, Descreened MAF, Throttle body coolant bypass, 4.10 gears, K&N and open air lid with addition of Exotic Muscle Long tube headers, Random Tech high flow cats, Meziere electric water pump, Dyno tune. |
326 |
306 |
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96 GS #470 |
Todd Emanuel |
Woodbridge Dynotech (Apr 2000) |
Stock but for GM Hot Cam |
323 |
336 |
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96 GS #086 |
Chris Halliday |
DynoJet - Vinci Hi-Performance, Orlando, FL |
Stock but for Corsa cat-back exhaust (made 309 RWHP - 320 TQ stock). |
322 |
317 |
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96 LT4 |
Tony Mezger |
Dynojet - Speedworks, Lewisville, TX (Jul 2001) |
Stage I ported heads and intake, K & N air filter, throttle body by-pass |
322 |
324 |
n/a |
96 LT4 |
Bob Eshleman |
Dynojet |
Dynoed after addition of Power Effects exhaust in 72 degree air. 96 LT4 with 75,000 miles |
320 |
331 |
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96 GS #633 |
John "Hutch" Hutchinson |
Dynojet - Vinci Hi-Performance, Orlando, FL (Feb 2000) |
Hooker shorty headers, PowerEffects exhaust, K&N, 52mm throttle body |
320 |
319 |
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96 LT4 |
Jim Allen |
DynoMite Dynamometer, RPM Motors, Santa Clarita, CA (Feb 2010) |
Completely stock LT4 (stock cam, stock exhaust, and stock air intake)
|
317 |
n/a |
n/a |
96 GS #267 |
Randy Randall |
n/a |
Corsa cat-back exhaust |
311 |
300 |
n/a |
96 GS #344 |
Nathan Biesemeier |
Dynojet - (Nov 2003) |
Stock except LT4 Hotcam. |
311 |
309 |
n/a |
96 LT4 |
Larry Fry |
Dynojet - The Dyno Shop, El Cajon, CA
(Sep 2006) |
Hooker Aerochamber Mufflers, 60K miles on LT4 coupe, untuned. |
311 |
325 |
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96 LT4 |
Evan Grimmett |
Tulsa Dyno & Performance, OK (Feb 2004) |
Bone stock but with ECM tuning. Made 300 RWHP, 317 TQ before tuning. |
309 |
323 |
n/a |
96 GS #967 |
Rolla Dunkin |
Mustang Dyno - Breathless Performance (Oct 2000) |
Open air filter lid, K&N filter and mild intake porting |
308 |
317 |
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96 LT4 |
Francois Boone |
DynoJet - D&D Speed Shop - Altendorf, Switzerland (Sep 2003) |
The car was bone stock with a paper air filter and had 29,740 miles. Upcoming mods: Hot cam, 52mm TB, Vortex ram air, Flowmaster cat back, 160° stat, LT1-edit reprogramming by myself. |
308 |
308 |
n/a |
96 GS #951 |
Brad Stephenson |
n/a |
Stock except for Corsa catback and K&N filter (K&N pulled for last run) |
306 |
314 |
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96 LT4 |
John Bolanowski |
Dynojet - (Jul 2002) |
Stock except for no mufflers, K&N air filter, 160 thermostat |
306 |
324 |
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92 LT1/4 |
Alton "Tuna" Dobbins |
Mustang Dyno - HP Racing Equipment, OKC, OK (Nov 2003) |
92 LT1 with fresh rings & bearings, LT4 Heads, LT4 Intake, LT4 Hot Cam, 1.6 roller rockers, Ed Wright (FastChips.com) chip, 160 stat, stock exhaust, stock induction w/ K&N filter. 103,700 miles on the rest of the car. |
305 |
313 |
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96 GS #682 |
Scott Gasiorek |
Dynojet - Tune Tech Auto Diagnostics (Aug 2001) |
BB Tri Flow & Ceramic Shorties, Forced Air, Mod. Mass Air
Sensor, 52 MM TB, >Airfoil, Fuel Pressure Regulator, etc |
304 |
305 |
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96 LT4 |
Chris Jones |
DynoJet - Carolina Auto Masters (Jul 2006) |
1996 Corvette LT4, Magnaflow catback, Descreened MAF, Throttle body coolant bypass, 4.10 gears, K&N and open air lid. |
304 |
308 |
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96 GS #621 |
Robin Dickinson |
Dynojet - Tune Tech Auto Diagnostics |
Flowmaster exhaust, K&N, no cats |
304 |
307 |
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96 LT4 |
George Sommer |
Dynojet - Performance Technical Center, Elk Grove, IL |
Corsa exhaust, SLP triple tree air cleaner, 160 stat, Hypertech program, 4.09 Gears |
302 |
n/a |
n/a |
96 GS #749 |
Ralph Giro |
Dynojet - Tune Tech Auto Diagnostics |
52mm TB, K&N Filter, Hypertech Power Programmer |
302 |
305 |
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96 GS #738 |
Steve Thompson |
Dynojet - AMP Performance, Phoenix, AZ (http://www.ampperformance.com)
(Jun 2006) |
Hooker Ceramic-coated Shorty Headers, K&N, mild porting of the heads. Ambient temp during run was 91 degrees F. |
300 |
306 |
n/a |
96 LT4 |
Bob Eshleman |
Dynojet |
Stock in 85 degree air |
300 |
301 |
n/a |
96 GS #007 |
Jim Mason |
Dynojet - Dynotech Motorsports |
Stock LT4 |
283 |
308 |
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96 GS #671 |
Kevin Gill |
DynaPack - New Zealand (May 2006) |
Stock but for K&N filter. |
281 |
295 |
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96 GS #039 |
Tim Bellomy |
Mustang Dynamometer, SW Tuning, Oklahoma City, OK (Jan 2008) |
Completely stock LT4 with Power Effects Exhaust |
269 |
317 |
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96 GS #901 |
Nick Anderson |
Dynocom, Warhorse Performance, Waco, TX (May 2020) |
Stock LT4 with muffler eliminators |
Email your LT4 dyno submissions to info@grandsportregistry.com
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