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. This allows for a commonly accepted 15% parasitic loss from the drivetrain. For example, a car which dynos at 330 HP at the rear wheels (RWHP) is probably making close to 388 HP at the flywheel. Big difference!

For comparison purposes, the 1996 Grand Sport Corvette with LT4 engine was factory rated at 330HP. The 2010 & 2011 Grand Sports with LS3 engine were rated at 430HP (436HP with the optional NPP exhaust system). 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+) DYNO RESULTS
RWHP	RWTQ	GRAPH	VEHICLE	OWNER	FACILITY/DATE	MODIFICATIONS
656	594		2012 GS	Joe Betras	Dynojet - LG Motorsports, Wylie, TX (Nov 2011)	LS3 with Edelbrock E-Force supercharger, ported heads, racing cam, Akrapovic exhaust with carbon fiber tips, custom tune by LG Motorsports.
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.
380	424		2010 GS	John "Hutch" Hutchinson	Dynojet - Corvette Masters, Orlando, FL (Mar 2011)	Totally stock LS3 with NPP exhaust

LT4 (1996) DYNO RESULTS
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.
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		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
365	380		96 LT4	Akan Askim	Dynojet - DPE Racing Engines (Aug 2002)	383 stroker, ported heads, 4340 forged crank, Lingenfelter throttle body, Borla exhaust.
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.)
355	n/a	n/a	96 GS #074	Jack Worley	n/a	Hot Cam and shorty headers
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
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
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)
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
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		96 GS #470	Todd Emanuel	Woodbridge Dynotech (Apr 2000)	Stock but for GM Hot Cam
323	336		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		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		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		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		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		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		96 LT4	John Bolanowski	Dynojet - (Jul 2002)	Stock except for no mufflers, K&N air filter, 160 thermostat
306	324		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		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		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		96 GS #621	Robin Dickinson	Dynojet - Tune Tech Auto Diagnostics	Flowmaster exhaust, K&N, no cats
304	307		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		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		96 GS #671	Kevin Gill	DynaPack - New Zealand (May 2006)	Stock but for K&N filter.
281	295		96 GS #039	Tim Bellomy	Mustang Dynamometer, SW Tuning, Oklahoma City, OK (Jan 2008)	Completely stock LT4 with Power Effects Exhaust

Email your LT4 dyno submissions to info@grandsportregistry.com