| Author | Message | ||
     Chasespeed |
Searching and reading... I haven't posted in YEARS. Got my old X1 back, and it has had some significant engine upgrades over the 1250 I had before. I have already spoke with the shop that did the work, and we are going to talk about some other stuff, including dialing it in for how I ride. But, the question is simply, how much can HP can the DDFI be made to reliably support. Anyone boring throttlebodies? Am I better off getting a Mik, and TwinTech dual fire set-up? | ||
| Normthenomad |
Depending on what modifications that have been made would dictate whether or not to go to the Mikuni and a different ignition. Just for ease of tuning I'd vote for Carb and ignition.What was done over and above the 1250 kit. 1275, headwork? | ||
| Chasespeed |
88ci Headwork Currently a mild SE536 cassette Flywheel work, etc | ||
| Victory |
IDS told me that the Buell Race ECM can handle anything a big bore kit can throw at it. They also told the ECM can adjust for the 1275 kit. too. They also informed there is a shit tone of misinformation and wrong stuff being said about the ECM and a Big Bore kit. You really should consult them and not just a speed shop. And hell with Buelltooth it looks like dialing it in is a whole lot easier than going back to a carb. If you dont think so or want to do that then buy some time at Hammer and do what they say. We are a tiny market. (Message edited by victory on July 05, 2021) | ||
| Chasespeed |
It isnt about the ECM/Progamming itself. The programming itself, is just programming. It's about the small throttlebody, and injectors being able to support it, and duty cycle on injectors. I am not andti fuel injection. Prefer it. But, for my Dyna and Road King, no problem tons of support. Need more air and fuel, tons of options. Let's just say, 50mm throttle body, and 4.9g/s injectors are good up 115-120rwhp.. The buell throttle body and injectors are nowhere near that. Hell, the Dyna when it had a 96ci in it, was 46mm and 3.9g/s Couldn't get it past 100hp. And, in case it was missed, we aren't talking a 1250/1275 ,it. 88ci, headwork, blah blah. Probably going to have it warmed over some more this winter... maybe see if I can it to 110-120rwhp... | ||
| Victory |
Did you look over the Dyno sheets at Hammer? Just pick a proven formula. I saw some @ 120 hp | ||
| Screamer |
At the end of the tube frame race era, some of the teams were getting 115-120 at the rear wheel using the DDFI hardware. (Message edited by screamer on July 06, 2021) | ||
| Chasespeed |
Screamer, that is what I remember as well. Spoke w/ someone @ Hammer today, and while 100-110rwhp is workable,after that, better off with a carb. Cost to benefit factor. Plus, I was told I'd be happier with end results of with a Mik48, vs the DDFI. The current 88ci build is 100/100. Falls flat, the 536 aren't enough cam for the head/cube package. Working with the last builder to put a package together, that moves the curve up and to the right... Which, as of right now, includes carb. Not urgent, runs great, snappy as hell... Was looking at maybe a Delphi conversion, but, cost/benefit ratio isn't there. | ||
| Normthenomad |
Are the 88" cylinders Axtell,Hammer performance or Revolution performance? My S2 has Millenium 1250 cylinders that were on the bike when I got it.Debating on taking it to 88". | ||
| Phelan |
X1 throttle body design is unfortunately small, with not really any room to make larger, without welding up a bit. It is definitely a bottleneck point on a big bore X1. That said, you can use a Sportster HPI big bore manifold and throttle body, or modify an XB manifold to use it, among other possible options. Don't let the fuel injection be your hold-up. Just use it as an opportunity to find a solution that keeps it, if you like it, as I do. That said, I would want to upgrade any DDFI model tuber to at least DDFI2. My S2 Special is getting DDFI3  . | ||
| Chasespeed |
Norm, they are Axtell iron jugs. Showing some cosmetic wear only(black is peeling, and some surface oxide is visible on close inspection). I would only do the Iron jugs on a 88 or 90. Adds some material. Also allow for warm-up time(iron between aluminum case and heads)... but,I've always done that...so.. Phelon, Matt mentioned you, and I was hoping you'd chime in. I wish I could remember how to "quote" on this board... but... I'm not against a realistic goal of modernizing the DDFI...if, even to Delphi.. I'd be all for that, as I can just add another license to m PowerVision, and more tuners are comfortable with that, which, SHOULD yield better results. In short, I'm all for it. To a point... diminishing returns and all. But, that being said, I need to find out where to start reading, and go from there. Any starting points? | ||
| Normthenomad |
Thanks for the input on the cylinders, I like the idea of aluminum cylinders but, like you I've had experience with Axtell over the years and if I do decide on the 88"or 90" cylinders it'll be Axtell.As far as fuel injection is concerned it makes carbs look as primitive as they are. Just would have a hard time justifying the time and money to try and get it dialed in and paid for. Dan at Hammer performance is my go to guy for what works the best.Good luck either way. Let us know how things shake out. | ||
| Normthenomad |
Also, Dan's personal bike is an S1. He's got a really good video with the 120hp kit in it on the dyno. | ||
| Deanh8 |
Better off running an ignition system from a newer harley TBH | ||
| Victory |
+ Hammer is porting the manifold for $75.00 Would any of you do this for a Race ECM X1? | ||
| Normthenomad |
Don't think I'd bother Unless you're going to have headwork done. Next time you have the intake off you can blend the manifold a little to match the ports on the heads, not that it's going to make much/any difference. | ||
| Chasespeed |
Everything should be done to match. Throttle body and manifold(and injectors) should match heads as far as flow, based on cam selection. Totaled advantage of all those cubes, and bigger valves, a different set of cams, at a minimum. Manifolds, and throttlebody come into question as well. ANOTHER thought, is the pipe. Can it support it? D&D full system. I've toyed with getting my hands on a force pipe, and doing some baselines, seeing which one is the engine is happiest with. Doesn't really matter, as I could never run the force up here. Hell, can't even get a sticker with the D&D. The Delphi system is light years ahead of DDFI. I do what I want, load base map, heat cycle, quick ride to make sure everything is happy, and seat rings.... and off to the dyno for tune. In fact, one bike is waiting for tune now(tomorrow). In short, I'd need more info regarding what they are doing for the porting. | ||
| Victory |
Id have to have this if I went that far. https://www.youtube.com/watch?v=Wti872reyng (Message edited by victory on July 21, 2021) |
