G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile

Buell Forum » Old School Buell » Archive through February 21, 2009 » Limits of the DDFI « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Thunderhead
Posted on Sunday, February 15, 2009 - 11:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

how much engine mods can the DDFI and injectors handle? is 88" with stage 3 heads and maybe .575" cams out of reach with the DDFI and stock injectors? or is the 1250 with mild headwork as far as you can go? i can get the 88" kit from my machine shop for under $1000, but he has no idea what the limits of the ECM,DDFI, and injectors are, and was talking about lots of discovery time on the dyno.
Top of pagePrevious messageNext messageBottom of page Link to this message

Oldog
Posted on Monday, February 16, 2009 - 10:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)



88" stage 3 and tall cams,

Time for a carb.....

or an aftermarket efi system.

ecm spy will allow resetting of the map values but its dyno time as you say.
Top of pagePrevious messageNext messageBottom of page Link to this message

Alex
Posted on Monday, February 16, 2009 - 10:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The stock system can handle much more than most people think (at least if one knows what he does). 88" is not really a problem.
Top of pagePrevious messageNext messageBottom of page Link to this message

Texastechx1
Posted on Monday, February 16, 2009 - 01:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i read somewhere of an X1 that had a 88ci kit, stage 3 heads, red shift 585s, a ported stock throttle body, bigger injectors that were stock on another harley or buell (i think it was a v-rod?) and was able to have the factory ecm remapped easily with room to spare... keep in mind though... carb CAN be cheaper if done right... and easier to tune in your garage instead of on a dyno like with EFI.

Like oldog said, that big and a carb becomes the better route for many reasons... I would try to stick with EFI as much as possible if it were me... but then again, I would advise others to do the carb swap and be done with it.

(Message edited by texastechx1 on February 16, 2009)
Top of pagePrevious messageNext messageBottom of page Link to this message

Oldog
Posted on Monday, February 16, 2009 - 01:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey T-Head you get the front and rear wheels lined up?

What was the problem?
Top of pagePrevious messageNext messageBottom of page Link to this message

Limitedx1
Posted on Monday, February 16, 2009 - 02:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

did i hear right that the injectors in our bikes are ford models? if so cant we get bigger injectors, or wont ecm spy calibrate things like that?

i have to get ahold of a shop in the pittsburgh area by the name of sampson racing, heard they build and tune some serious buells
Top of pagePrevious messageNext messageBottom of page Link to this message

Limitedx1
Posted on Monday, February 16, 2009 - 02:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sampson Racing Ent

Pangburn Hollow Rd, Monongahela, PA 15063 Phone: (412) 384-3217

im almost positive this is it, give them a call and im sure they can answer any question you have. i need to pay them a visit to see if they can re tune my bike, or at least check it and make sure it is tip top
Top of pagePrevious messageNext messageBottom of page Link to this message

Thunderhead
Posted on Monday, February 16, 2009 - 03:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Olddog- i took the engine back out this weekend, replaced front and rear isolators and just used the front tie bar for a quick eyeball. re-adjuted the rest of the tie bars starting from the front and put them on so they fit without a bind. ive got the rear wheel out .018" at the swing arm adjusters and the thing is within the width of my string i was using for the alignment, maybe .025-.030".i need to do the tps thing and i will be on the road.
Top of pagePrevious messageNext messageBottom of page Link to this message

Oldog
Posted on Monday, February 16, 2009 - 05:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

T-head the rear wheel must be square to the arm pocket with in .015" to be inspec

sounds waaaay better than 2",

No bent frame thats good!
Top of pagePrevious messageNext messageBottom of page Link to this message

Buellsrule
Posted on Monday, February 16, 2009 - 05:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was going to wait until I was done tuning but this post has forced my hand. While it is true that for many years a carb was the way to go because of the primitive nature of our beloved bikes archaic fuel injection this is no longer true. The fuel injection on the early Buell's can be made to work with just about any engine combination. I just put my 11:1 1250, 585 Redshift, stage 3 heads by NRHS X1 back together and can tell you that the stock injection can definitely be made to work...BUT you will have to either datalog or dyno the bike with ECMSpy and a datalogging system. I've got a total of about 200.00 in my setup (not including injectors). I also know of an 88" XB built and tuned by Terry Reed racing in Columbus, a 90" XB in Australia and a really hot 12:1 1200 XB in Ohio that all ran the stock injection system with or without the stock injectors. I have found an aftermarket set of injectors that are a direct replacement for the stock injectors and can flow substantially more fuel than stock but you won't need them unless you are building an 88/90". Any 1250 can run the stock injectors. The idea of a carb is totally unnecessary. I can tune my bike far better than anyone could tune a carb for my bike. The datalogging/dyno tune makes it possible to make more small corrections than you can make with jets and an air/fuel screw. If any of you want to talk to me about this send me an email and I'll give you all the details. Ride safe, Frank.
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a private posting area. Only registered users and custodians may post messages here.
Password:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration