Changing injectors from 8* to 25*...do I need a new dyno tune?
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Ultimate HDF Member
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From: MA
Changing injectors from 8* to 25*...do I need a new dyno tune?
I'm going to swap my injectors from the 8* ones to 25* at my 10k mile service. When I did my stage 1 and dyno tune last year I didn't know about the injector upgrade. My question is, when I switch to the 25* injector will I need to do another dyno tune?
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From: Florida
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
petemac, do you have some sort of fuel management system on your bike (PC111, SERT, fuel pack)? If you don't, you will need a new HD cartridge from the dealer for the 25 injectors.[/align]
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ORIGINAL: petemac
I'm going to swap my injectors from the 8* ones to 25* at my 10k mile service. When I did my stage 1 and dyno tune last year I didn't know about the injector upgrade. My question is, when I switch to the 25* injector will I need to do another dyno tune?
I'm going to swap my injectors from the 8* ones to 25* at my 10k mile service. When I did my stage 1 and dyno tune last year I didn't know about the injector upgrade. My question is, when I switch to the 25* injector will I need to do another dyno tune?
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Joined: Sep 2006
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From: Florida
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
Yep, they will need to remap the SERT....Do they have a Dyno? Is the injector swap on a recall, or are you just wanting to change them? If it is a recall they will need to do the remap and dyno for free.
ORIGINAL: petemac
85FXWG, yes I have a SERT. I'm thinking I need to bring this in and get a new map.
85FXWG, yes I have a SERT. I'm thinking I need to bring this in and get a new map.
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Ultimate HDF Member
Joined: Jul 2006
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From: MA
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
I believe the injector is a recall item. I know a lot of guys here have had it done under warranty and I'm planning on this too. Yes, the dealer has a dyno and didthe map and dyno for me last time. I have the SERT boxin the garage andI'm hoping when I call them they'll agree to do a new map and dyno at no charge. I wish they had checked the injectors then and told me I needed to swap them out before the new map.
ORIGINAL: 85FXWG
Yep, they will need to remap the SERT....Do they have a Dyno? Is the injector swap on a recall, or are you just wanting to change them? If it is a recall they will need to do the remap and dyno for free.
Yep, they will need to remap the SERT....Do they have a Dyno? Is the injector swap on a recall, or are you just wanting to change them? If it is a recall they will need to do the remap and dyno for free.
ORIGINAL: petemac
85FXWG, yes I have a SERT. I'm thinking I need to bring this in and get a new map.
85FXWG, yes I have a SERT. I'm thinking I need to bring this in and get a new map.
Road Captain
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RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
????
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
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Ultimate HDF Member
Joined: Jul 2006
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From: MA
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
That's my question. I don't know enough about how the injectors work to know. Since the injectors are part of the fuel system I was thinking it could affect the fuel/air ratio in the map.
Maybe not.......
Maybe not.......
ORIGINAL: DoCPooF
????
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
????
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
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Joined: Sep 2006
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From: Florida
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
More fuel with the 25's.......= running rich
[align=left]If the part numbers on the fuel injectors are rubbed off or otherwise[/align][align=left]unreadable, count the number of orifices or holes in[/align][align=left]the injector nozzle.[/align][align=left]The 8° angle cone spray fuel injector has[/align][align=left]just three holes, while the 25° has six. [/align][align=left][/align][align=left]See NOZZLE END in[/align][align=left]Figure 1.[/align][align=left]4. Update the ECM calibration. For those motorcycles[/align][align=left]equipped with P&A Screamin’ Eagle 1450cc or 1550cc[/align][align=left]Performance Kits, refer to h-dnet.com for the correct calibration[/align]
http://mysite.wanadoo-members.co.uk/hhlair1/M1185.pdf
[align=left]If the part numbers on the fuel injectors are rubbed off or otherwise[/align][align=left]unreadable, count the number of orifices or holes in[/align][align=left]the injector nozzle.[/align][align=left]The 8° angle cone spray fuel injector has[/align][align=left]just three holes, while the 25° has six. [/align][align=left][/align][align=left]See NOZZLE END in[/align][align=left]Figure 1.[/align][align=left]4. Update the ECM calibration. For those motorcycles[/align][align=left]equipped with P&A Screamin’ Eagle 1450cc or 1550cc[/align][align=left]Performance Kits, refer to h-dnet.com for the correct calibration[/align]
http://mysite.wanadoo-members.co.uk/hhlair1/M1185.pdf
ORIGINAL: DoCPooF
????
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
????
Why would you have to redo a dyno with a change in injectors?
The stock ones where 8 degree spray patter, the 25 is obviously a 25 degree spray pattern - which helps with better ignition and less sputtering on take off.
I find it hard to believe this would call for a remap and dyno.
JMO.
And yea, those were a service bulletin and you sould not have to pay a dime to have them changed.
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Road Master
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RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
If you trust your dealer's service department, let them instruct you on what you'll need to have done. Just don't let them sell you something you Don't need.
Why did you wait so long to have this done?
Why did you wait so long to have this done?
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Ultimate HDF Member
Joined: Jul 2006
Posts: 9,335
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From: MA
RE: Changing injectors from 8* to 25*...do I need a new dyno tune?
When I heard about the SB for the injectors it was after I did my Stage 1 and I was under the impression that the fix was only requiredif the bike washardto start when cold and ran rough.Neitherseemed to apply to my bike. But last week I hadan indy shopchange my front brake pads and"unstick" a caliper piston and on the test ride he saidhe thoughtit ran rough after startup and some times during the ride and suggested I change to the 25* injectors.This is themy first Harley and the only one I've ridden(other than anUltra for a week) and he has more experience with this than I do. I always assume every noise andvibration is normal on a Harley..... 
ORIGINAL: Dinger
If you trust your dealer's service department, let them instruct you on what you'll need to have done. Just don't let them sell you something you Don't need.
Why did you wait so long to have this done?
If you trust your dealer's service department, let them instruct you on what you'll need to have done. Just don't let them sell you something you Don't need.
Why did you wait so long to have this done?