GT Thunder Test Bench


Exhaust Shoot-out
Exhaust Shoot-out Click Here


GT Thunder Test Bench

Under Construction
This page will always be under construction. Please check back frequently for more info. I have over 5000 dyno runs that I can put here as I have time. I will keep the most recent testing posted on here first. If you want more details on the tests feel free to contact me by e-mail and I will reply as I have time.

If you are building a product that you would like tested we will gladly test and post on here as time permits.

Remember an educated public will expect higher quality products and services.

These tests are designed to help you deside what is best for you and your aplication.

Every company out there has the intent to build a good product that everyone likes but you must remember that only you can deside whether you like the product.

Enjoy

Lazarus Sommers


Dyno Runs
By group or Individual

400EX Dyno Runs
400EX Runs Click Here



Yamaha 350 Warrior Dyno Runs
Yamaha 350 Warrior Runs Click Here



This is a stock yz250f vs. a stock 2001 kx125.
yz250f
CLICK HERE

This is what G T Thunder stage II porting on a Banshee can do with the right parts.
Bike owner: John Shephard.
Stage II Banshee John Shephard
CLICK HERECLICK HERE

440 Kit with Big Gun exhaust vs. GT Thunder exhaust.
440 Kit
CLICK HERE

All Stock 1999 RM80.
99 RM80
CLICK HERE

Polaris 500 with Hot Seat exhaust - 29.6 HP.
Polaris 500
CLICK HERE

400ex all stock vs. with no spark arrester.
400ex all stock vs. with no spark arrester
CLICK HERE

400ex all stock vs. with no spark arrester.
1995 Yamaha YZ80.
1995 YZ80
CLICK HERE

Yamaha yz80.
TRX250R
CLICK HERE

TRX250R Pipe tests - DG Pipe vs Dyno Port pipe vs Cobra pipe.
TRX250R
CLICK HERE

TRX250R Pipe tests - Stock pipe vs Trinity pipe vs LRD pipe.
TRX250R
CLICK HERE

TRX250R Pipe tests - LDR pipe vs Old FMF Fatty.
TRX250R
CLICK HERE

TRX250R Pipe tests - 300cc Cyl.
TRX300R
CLICK HERE

Stock 400EX with aftermarket exhaust and no air box lid compared to same with White Bros. cam. To make the cammed engine run right we had to go to a 160 main jet but I left this run with a 155 main jet.
Cammed 400EX
CLICK HERE

Stock 350X with Cobra exhaust compared to Stock 400EX.
Stock 350X
CLICK HERE

All stock 1997 400 polaris.
400 polaris
CLICK HERE

My latest 400EX setup compared to a 1999 YZ 400F.
Latest 400EX setup
CLICK HERE

TRX250R Pipe comparison. Everything is the same on these dyno runs except the pipe. Compares Old FMF Fatty, New FMF Fatty and Paul turner race pipe. There is a greater differance than you may think. View the next dyno run to see what I mean.
Pipe comparison
CLICK HERE

TRX250R Pipe comparison continued. This graph displays torque not horsepower.
Pipe comparison 2
CLICK HERE

ATC250R with 300 big bore, custome pipe, PGI ignition and Lectron carb. 185# three wheeler
ATC250R
CLICK HERE

All stock TRX250X compared to same with White Brothers exhaust.
TRX250X
CLICK HERE

TRX250 with a CR500 engine installed. Cyl. is ported and has head rechambered. Custom pipe to fit quad & Lectron carb. I can post photo of this pipe if anyone wants to see it.
TRX250
CLICK HERE

1997 YZ250 that has beeb modified by FCR developement including Head work, ported, polish carb & ProCircuit pipe.
YZ250
CLICK HERE

250 R with stock 1986 cylinder, cool head - 23cc dome, rad valve FMF fatty pipe, FMF turbine core silencer, and a K&N filter. 41.1HP
250 R
CLICK HERE

1998 Stock Banshee compared to same with stock bore and Toomey pipes, 34mm PJ carbs with 155 main jet, Stage III porting, Cool Head, and Ignition advanced 5 deg.
1998 Stock Banshee
CLICK HERE

1996 Yahama 350 Wolverine all stock max HP - 13.8
1996 Yahama 350 Wolverine
CLICK HERE

1996 Honda 300EX all stock compared to same with Ported head, Wiseco high comp. piston, mild cam, Cobra jet pipe. 6.8 HP increase!
1996 Honda 300EX
CLICK HERE

1999 KX80 with the following mods:
  • Stroker Crank
  • Altered port timing
  • Modified powervalve govener
  • 28mm carb
  • FMF pire

  • KX80 Mods
    CLICK HERE

    1998 RM250 all stock compared to one ported, rechambered head & Bills pipe.
    1998 RM250 vs mod
    CLICK HERE

    All stock YZ400F hitting rev limiter at 11,600 RPM compared to a highley modiried TRX400EX hitting rev limiter at 9,200 RPM. It's a shame that you have to spend mega bucks on the Honda. If you want detailes on the TRX mods, feel free to contact me.
    LS
    YZ400F
    CLICK HERE

    O-ring chain compared to Non-O-ring chain
    RK vs O-ring chain
    CLICK HERE

    Stock Impluse Mini Quad (max horsepower 1.3) campared to Stock Lem Mini Quad (max horsepower 2.3)

    Impulse vs Lem Mini
    CLICK HERE

    Stock 1999 RM 125 as received from Suzuki compared to one with the Billspipe installed.
    1999 RM 125 with Billspipe
    CLICK HERE

    Stock 1998 RM 250 compared to one with the Billspipe installed.
    1999 RM 125 with Billspipe
    CLICK HERE

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