Winter Mod Power increase on Deuce
#1
Winter Mods Power increase on Deuce
In November after reading many posts on here and watching many tutorials on youtube i decided to tear down the top end on my deuce and have a go at getting some extra power. The only mods i had made prior to this was to fit a heavy breather and a V&H big radius 2 into 2. My shopping list was as follows:
Raised port heads w/1.900 valves, with compression releases
10.1 compression
88 to 98 big bore kit
Andrews 54 gear cams
Bored throttle body 43mmm to 48mm
Adjustable push rods
Well i got it altogether after just having to by one special tool to remove the inner cam bearings. Once all assembled i turned the motor over with no spark plugs fitted to get some oil pressure and then reinstalled the spark plugs and then had a great felling of satisfaction when i hit the start button and it fired straight up.
Well the bike got transported last week to be dynoed and it got tuned today here are my results which i'm really happy with and a few photos.
Raised ported heads
Here is a picture of the bored throttle body from 43mm to 48mm for the 2001 2005 EFI models
Results
Here is some info on the tuning route i took
Harley introduced fuel injection during the 1995 model year on the Ultraglide (FLHTCUi) during the Evolution era, and with the arrival of the Twin Cam some models were available with a choice of either a carburettor or fuel injection. Everything for 2007 and later (including the Sportsters) is only available as EFI (Electronic Fuel Injection). Whilst it may well be the case that ever tightening emissions regulations have caused the move to EFI, it also true that the change to the Delphi engine management system has brought with it tremendous tuning potential. Any modification that alters the engine's ability to breathe, whether it be an air cleaner change, exhaust system, cams, heads, or a capacity increase, changes the fueling requirement. A compression increase also requires a change to the ignition maps. If any of this is not done correctly, then at best we have an under performing engine with driveability issues, or at worst, a short engine life.Unfortunately, much of the market despises this new technology because of it's complexity and the cost of dealing with EFI properly. However, we have chosen to embrace it and to that end we have installed our state of the art Superflow Eddy Current dyno and Technoresearch Direct Link Flash Tuner engine management facility.
Using these two products together we can measure and record every signal that the Harley Delphi ECM (Electronic Control Module) receives and puts out at all throttle positions and engine loads, and remap it accordingly. This includes everything from fuel injector duty cycle to ignition timing adjustments on each cylinder. We have full control over the way the engine runs, which is not the case with the "piggy back" add on fuelers. The Direct Link Flash Tuner system allows us to remap the factory ECM and nothing is left connected to the bike afterwards, and because we are using the stock ECM, any Harley dealer, worldwide, can still use their Digital Technician for diagnostics.
Raised port heads w/1.900 valves, with compression releases
10.1 compression
88 to 98 big bore kit
Andrews 54 gear cams
Bored throttle body 43mmm to 48mm
Adjustable push rods
Well i got it altogether after just having to by one special tool to remove the inner cam bearings. Once all assembled i turned the motor over with no spark plugs fitted to get some oil pressure and then reinstalled the spark plugs and then had a great felling of satisfaction when i hit the start button and it fired straight up.
Well the bike got transported last week to be dynoed and it got tuned today here are my results which i'm really happy with and a few photos.
Raised ported heads
Here is a picture of the bored throttle body from 43mm to 48mm for the 2001 2005 EFI models
Results
Here is some info on the tuning route i took
Harley introduced fuel injection during the 1995 model year on the Ultraglide (FLHTCUi) during the Evolution era, and with the arrival of the Twin Cam some models were available with a choice of either a carburettor or fuel injection. Everything for 2007 and later (including the Sportsters) is only available as EFI (Electronic Fuel Injection). Whilst it may well be the case that ever tightening emissions regulations have caused the move to EFI, it also true that the change to the Delphi engine management system has brought with it tremendous tuning potential. Any modification that alters the engine's ability to breathe, whether it be an air cleaner change, exhaust system, cams, heads, or a capacity increase, changes the fueling requirement. A compression increase also requires a change to the ignition maps. If any of this is not done correctly, then at best we have an under performing engine with driveability issues, or at worst, a short engine life.Unfortunately, much of the market despises this new technology because of it's complexity and the cost of dealing with EFI properly. However, we have chosen to embrace it and to that end we have installed our state of the art Superflow Eddy Current dyno and Technoresearch Direct Link Flash Tuner engine management facility.
Using these two products together we can measure and record every signal that the Harley Delphi ECM (Electronic Control Module) receives and puts out at all throttle positions and engine loads, and remap it accordingly. This includes everything from fuel injector duty cycle to ignition timing adjustments on each cylinder. We have full control over the way the engine runs, which is not the case with the "piggy back" add on fuelers. The Direct Link Flash Tuner system allows us to remap the factory ECM and nothing is left connected to the bike afterwards, and because we are using the stock ECM, any Harley dealer, worldwide, can still use their Digital Technician for diagnostics.
Last edited by Andy-Deuce; 02-16-2014 at 04:41 AM.
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