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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

Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget


Recommended Upgrades for 2007/2008 HD Twin Cam engine

The number of 2007 performance engines is increasing. But still recommends staying with fairly conservative upgrades. We are only listing a few bolt-in cams right now that meet the performance needs for all but the most radical of engine builds.

Please be aware that complete exhaust systems and cam shafts are very specific to all 2007/08 96/110 CID engines and 2006 Dyna models. Exhaust systems for these bikes have bungs installed in them for the O2 sensors required to maintain EPA compliance. While any exhaust system can have O2 bungs welded into them, placement of these bungs is important and the chrome will be damaged when welding in a bung.

We will continue to expand the engine upgrades section as more parts become available for the 2007/08 bikes.

Harley-Davidson Screamin' Eagle Warranty Issues

It seems that many riders believe that using Screamin' Eagle performance upgrades have no effect on their HD Warranty. Despite what the local HD Dealer may tell them, only HD parts that are listed in the 2007 Catalog with a "green light" designation can be installed on their bikes without having a negative effect on the warranty. This means that most Screamin' Eagle components will void the warranty on much of the engine.

While in some cases your local HD Dealer can "sneak" a warranty issue through Harley's process as a courtesy to its own customers, it is highly unlikely that another Dealer will extend the same courtesy.

No matter what your local Dealer may tell you, the explanation of the warranty listed above is an honest interpretation of how Harley-Davidson is now enforcing its warranty.

The chart below lists recommend parts for upgrades that can be performed to your 2007 Harley-Davidson. While the list is not all inclusive, it does contain a list of parts that Nightrider has extreme confidence in. These parts and suppliers have historically provided the type of components and upgrades that have above average performance.

Component FLH based Bikes Dyna/Softail Sportster
Exhaust Upgrades

There are many good exhaust system upgrades, however we have chosen to list the systems we know produce above average power. These are systems that we would use as "reference" performance when dyno testing other pipes.

Khrome Werks HP Plus slip-on Mufflers

SuperTrapp slip-on mufflers


RB Racing LSR

Khrome Werks slip-on Mufflers


SuperTrapp 2-1

RB Racing LSR

Khrome Werks slip-on Mufflers


SuperTrapp 2-1

Air Cleaner K&N Air Cleaner Kit

SE Air Cleaner Kit

K&N Air Cleaner Kit

SE Air Cleaner Kit

K&N Air Cleaner Kit

SE Air Cleaner Kit

EFI fuel adjust
for stage 1 upgrades only

MasterTune TTS

TFI Techlusion

MasterTune TTS

TFI Techlusion

MasterTune TTS

TFI Techlusion
EFI and Ignition Remapping 
Required for serious performance tuning
SE Race Tuner
Thundermax EFI
Daytona Twin-Tec
SE Race Tuner
Thundermax EFI
Daytona Twin-Tec
SE Race Tuner
Thundermax EFI
Daytona Twin-Tec
Aftermarket EFI Notes: We recommend the use of Wide Band O2 sensor upgrades with aftermarket ECUs when this type of upgrade is available. The ability of the ECUs like the ThunderMax and Daytona Twin Tec to self-tune with their WBO2 sensors add-in can save riders money over the long term. Rather than having to pay for tuning when you make changes to your engine, you simply put the ECU into "self learn" mode and the fuel map can be updated.
For fine tuning to maximize power, some minor dyno time may be needed. But the 3-4 hours required to create a custom fuel map from scratch is eliminated.
Bolt-in Camshaft

Gear Drive cams are not required for the 06 Dyna's and 07 engines. HD has dramatically improved the cam drive mechanics.

Andrews TW-26H
Crane HTC-300
Kuryakyn TC-1
Andrews TW-37H
Crane HTC-310
CycleRama CR-3
Andrews TW-26H
Crane HTC-300
Kuryakyn TC-1
Andrews TW-37H
Crane HTC-310
Kuryakyn TC-2
CycleRama CR-3
Big Inch Kit Nightrider recommends a 103 CID big bore upgrade as more cost effective than the 110 stroker upgrade. 883 to 1200 upgrade
Performance Cylinder Head Upgrades While the SE cylinder heads can produce nice improvements in performance, Nightrider recommend the use of professionally ported heads from the aftermarket to maximize power capability. The top rated performance shops are constantly refining their product to improve power output. The best performance shops are able to get 100+HP and torque from 95/96 cubic inch engines with 9.5:1 compression. This would translate to 110/110 from a 103CID engine and 120/120 from a 110CID. Nightrider recommend the use of professionally ported heads from the aftermarket to maximize power capability. A well configured and tuned 1200cc engine is capable of 100-110HP.
Maximum Compression Ratio 9.5:1 compression ratio is recommend to prevent detonation and overheating that frequently occurs in the heavy FLH based bikes. A properly built 9.5:1 engine makes about 97% of the power of the higher compression engines. 9.5:1 compression is recommend for most bikes.

Ratios up to 10.5:1 can be used when the top end of the engine is properly blueprinted. It is highly recommend that RPMs be kept above 2500 RPMs while riding to prevent detonation.

High Lift Camshaft
Bolt-in cams can also be used very effectively. Gear Drive is not required for 07 engines.
CycleRama CR-5
Red Shift 575
Andrews TW-32H
Kuryakyn TC-26
CycleRama CR-5
Red Shift 575
Andrews TW-32H
Kuryakyn TC-26
Andrews TW-55
Red Shift 577
Performance Throttle Body Recommended for serious performance work Recommended for serious performance work Recommended for serious performance work
Performance Notes      
Crankshaft Bearings 96 CID engines are known to have weak crankshaft bearings. For serious performance work these bearing must be replaced with the heavy duty bearings used in the CVO 110 engine. The 110 upgrade kit does not contain these  bearings.
Any 96CID based engine that is going to experience 'severe use' or is expected to produce over 110HP should consider this bearing upgrade. When the OEM bearings have a problem, the engine will experience a catastrophic failure.
Hot exhaust and engine temperature The 2007 engines have a reputation for very hot exhaust systems. This problem is well documented for the 2007 FLH's, but does exist on all the bikes. All these bikes including the 2006 Dyna's are also know to have high operating temperatures and poor throttle response while cruising. This issue is directly related to the EFI closed loop operation mode at idle and cruising speeds. In closed loop mode, the narrow band O2 sensors used by the Delphi ECU hold the air fuel ratio at 14.7:1 which is good for EPA compliant emissions but creates a very hot exhaust pipe. Nightrider has a fix for this issue that will reduce the exhaust temperature, improve throttle response and increase HP. See the LC1 WBO2 upgrade page for more information.
Hot Exhaust Fix
(LC-1 WBO2 upgrade for HD)
Here is a first look at the electronic control module used for the Nightrider fix for the hot exhaust / hot engine temperatures found in the 2007/08/09 HD bikes. The size of the main electronics module is 3.5"Lx1.5"Wx0.9"D and is intended to mount under the fuel tank or the seat of the bike.

The upgrade will consist of two LC-1 electronic modules, two WBO2 sensor, HD wiring harness adapter, programming instructions for the LC-1, and detailed installation instructions to connect the upgrade to your motorcycle.

No ECU upgrades or ECU programming required for HD/SE Stage 1 and Stage 2 upgraded engines. The upgrade is 100% compatible with any of the HD or SE ECU downloads, and is compatible with SE Race Tuner for highly modified bikes.


Table of Contents
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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
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
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam

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

Shop Manual
Carburetor Troubleshooting
Finding Manifold Leaks
Cylinder Heads
Pistons and Cylinders
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
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
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 -+-