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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
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
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 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
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
333 320 96 GS #074 Robyn Stangel Dynojet - Auto Repair Specialties - Gresham, OR
(May 2012)
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


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