st4s in 851, how to do electronics?

[saludos]

Hi Guys,

I'm quite new here and read so much, but....

In my garage I've got my 851, single injector P7 computer bike, with 100.000 km's and oil consumtion.

Next to that a ST4S ABS, (total-loss) bike, which I just bought.

Yes, off-course I want to use the 996 engine in my bike, technical ( frame) mods is no problem.
Which set-up is the best way to go, electronical? I want to buy the parts before I start builing. Run on P7, single injector, of go to P8 double injector, and which parts do I need, or use all the ST4S electronics? ( I've been told that these silly computers break down...)

I already bought new SPS cams, and I want to make a quick street bike...

Anyone can help me? I already read about all different systems, but isn't anyone using stock-parts?

[Henrik]

Hi

I guess the reason for not having any answers in 24 hrs is that there are to many options.

I did an engine change last winter (described in thread winter project). Being a novice I took the easy route and bought an ECU which could be programmed to suit the engine configuration. Marvin is doing the same engine swap but is going more into the details of the electonics, also described in various posts. Hauge is fiddling around with different setups for his motor change, also described in posts. Plus a number of more. So I guess it's to many options to say which route is the best.

Any way you choose the first advise must be to sell your old engine and all your other bikes. Then your only way is forward..

Good luck
Henrik

[saludos]

Hi Henrik,

Yes, that's what I read.... Too many options, and everybody is taking another route. In Holland there is a saying: "You can't see the forest through the trees anymore"... There are so many ways to go, that I can't find out which way is te best, but:

I've just bought a P8 computer incl. wiring loom, and I will just start... I would like to put sps-cams in and perhaps run on dual-injector system.

I've been told that the st4 ecu's break down, so that's no option...

Off-course all input is welcome!!!

Eeeeh, sell old engine and all other bikes???? Naaaa, that's no option, I think. Just because it looks nice in my workshop.... ;-)

Grtz,

Peter

[brad black]

the st4s engine is a single pick up motor compatible with 1.6m, 1.5m, 5,9m and 5am ecu. if you want to run a p8 on it you'll need to get a dual pick up system running, the only one to swap in is from a 2000 996sps i believe.

it'd be much easier to run a 1.6m ecu, with a loom taken from a st4 for astart i'd say. probably want to go dual injector or more fuel pressure at least if you're going to be running sps cams.

[Keith888]

I might be missing something obvious here but cannot he just swap his old LHS alternator cover with twin pickups onto the ST4s engine. Probably also needs the gears (with appropriate 'lumps') swapping as well but probably easier than swapping ECUs??

Keith

[mikesps]

You would need a suitable flywheel as well, that is why Brad mentioned the 996SPS, both 1999 and 2000 had the later crankshaft splines I think.

I am using an FIM U59 and the rear part of the ST4S loom.

Originally Posted by Keith888

I might be missing something obvious here but cannot he just swap his old LHS alternator cover with twin pickups onto the ST4s engine. Probably also needs the gears (with appropriate 'lumps') swapping as well but probably easier than swapping ECUs??

Keith

[Keith888]

Originally Posted by mikesps

You would need a suitable flywheel as well, that is why Brad mentioned the 996SPS, both 1999 and 2000 had the later crankshaft splines I think.

I am using an FIM U59 and the rear part of the ST4S loom.

That makes sense now! I wondered why it was not that easy.

Keith

[vij]

I did a very simular upgrade last winter. I installed a s4r (same 996 engine as ST4S) with 996 sps cams in my 1991 851. I used 916 wiring as it is very compatible with a 851 and I am running with a P16 with a FIM / ultimap 222 single injector chip for the moment. I am experimenting with a MyECU but for the moment I use P16. I am using the original 851throttle bodies with open airbox and ST4 headers with Sil moto ST4 slipons.

Here are some info and some pictures

http://www.ducati851and888.com/showthread.php?t=1392

If your ST4 has P16 ECU all is perfect. Just install it all with exhaust and everything. Maybe try to get a UM222 just so you can adjust it a bit.

If you have a 5,9 ecu it is a bit limiting as they are not easily tunable but should work good anyway. U59 is not an option as ultimap closed down.

I would just transplant the whole powerpackade including exhaust and wiring and just make it fit.

On my transplant the only modification I had to make were to replace the connector on the tank to make it compatible with 916 wiring. The rest was more or less a stright fit with some adjustment. Not difficult at all.

Jocke....

[saludos]

Aaaaaah, now things are getting clear to me and I already know a bit more....

The St4S donor runs indeed on 5.9 ecu. So, I have to make a choise, run on a P8, with dual pick-up, or go for a 1.6m.

My idea was to use my 851-dual pick-up cover, alternator and flywheel but I'm wrong, apparently

So can I fit the St4S alternator in a SPS cover, or my old 851 cover, together with a 996 sps Flywheel, for instance http://www.ducati-kaemna.de/cms_de/k...el&artikel=889

I prefer to use "standard" parts above making something.... I already made so much parts for my old Beveldrive 750, and I don't want to make it a project like that ( it took me 4 years....)

You're really helping me out, thanks guys!!! ( and keep on writing;-))

[marvin]

I'm going the 1.6 ECU route. SPS parts are hard to find used and I have no way to burn a chip for a P8.
I have never heard about any reliability issues with the 1.6.

Jimmy used the SPS parts perhaps he can chime in here.?