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Don't let the Harley heat monster ruin your riding.
Reduce  Engine Surging
Improve Throttle Response
Reduce Engine Ping

 

HD 2007/2008 Engines

High Heat on 2007/08 HD engines

HD 2007/08 Performance Recommendations

Cool your exhaust temperature with the Wide Band O2 upgrade for 2007/08 HD

Harley Camshaft Specification Tables

HD Twin Cam Engine Builds
TC 128 HP 95 CID
TC 100HP Street Engine

The basics of Fuel Injection explained

DEWEY'S CUSTOM
Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget

   

Drag Race Simulator for
1/4 mile, 1/8 mile or Top Speed

This simulator was developed by John Bolton. Default values entered into the simulator were provided by Motorcycle Performance Guide. The numbers entered represent a well tuned Stage 1 Evolution engine in a Dyna or Softtail frame with an 150 pound rider.

Simulator Notes and User Guide

Engine Data

Max Engine Speed: RPM Rear Wheel Torque (drivetrain torque loss ignored)

Torque (pound-feet)/RPM Pairs
(Default values are from a well tuned stock EVO 80 CID. This is not an average engine.)
  Torque RPM
1
2
3
4
5
  Torque RPM
6
7
8
9
10
  Torque RPM
11
12
13
14
15
  Torque RPM
16
17
18
19
20
Drivetrain

Gear 1 2 3 4 5 6 Axle
Ratio (:1)


Drivetrain Torque Loss: %
Chassis/Body

Race Weight: lb Weight on Rear Wheels: % of Race Weight
Center of Gravity Height: in Wheelbase: in
Coefficient of Drag: Cross-Sectional Area: ft2
Tires

Tire Diameter: in
Coefficient of Rolling Friction:
Coefficient of Static Friction:
Environment

Temperature: o F
Barometric Pressure: in Hg
Driving Style

Shift Point
(RPM)
Auto Duration
(ms)
1-2
2-3
3-4
4-5
5-6
Roll Out: in
Launch: RPM


Time
Delta
(ms)
Display
Delta
(ms)
Mode Tower
5
10
25
100
250
500
1/8 mile
1/4 mile
Top speed
Summary Only

Auto Recall of Last Run

Memory
Location
Location Name
1 Last Run
2
3
4


Notes:

bullet

Check Auto Recall of Last Run and all form settings and values as of your most recent "run" (after clicking the Go! button) will be automatically restored for you the next time you visit! For this to work, your browser must be configured to accept cookies.

bullet

Be sure to select the desired memory location before clicking one of the memory buttons (Recall, Store, Clear).

bullet

Launches are clutch-slipping with traction control, meaning RPM will stay at or above Launch RPM, and if torque to the rear wheels exceeds available traction, torque is reduced as much as is necessary to "prevent" wheelspin.

bullet

Inertial forces of the flywheel, engine reciprocating assembly, etc., during launch are ignored, mainly because I don't know how to correctly integrate them into my calculations.

Be patient after the results window pops up. This simulator (minus the form) is implemented entirely in client-side JavaScript (your computer executes it). On a 200 MHz Pentium running Netscape Navigator 3+, 1/4 mile results can take 5-10 seconds, while top speed results can take up to 30 seconds or so. Microsoft Explorer may take 2 to 3 times longer.

Top

1998 John A Bolton.
All Rights Reserved.




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Modification, Installation, Maintenance and Tuning Index  will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2


Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1  
TC95 128HP Stage 3
TC95 100HP Street
 
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Shovelhead
Sportster
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Camshafts
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam
EVO
Shovel
XL


Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

SHOP TALK
Shop Manual
Carburetor
Carburetor Troubleshooting
Exhaust
Ignition
Finding Manifold Leaks
Camshafts
Cylinder Heads
Pistons and Cylinders
Clutch
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Miscellaneous
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
MPH at RPM
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc

Copyright 1997-2006  Stephen Mullen, Oldsmar, FL -+-