Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue Parts For Sale & Wanted > Class A bike build help engine wanted

[skidlids]

The rules state you need to run standard 620 heads and Cams, the heads are Stamped with the coding 2S (or S2).
So it would be possible to fit heads and Barrels from a 620 to the 750SSie.

I ran my 620 on a 1.5M ECU for a year and Andy Challis did so last year winning the odd race along the way. Although the Rev limiter on them does come in a bit early compared to a 620s ECU

[bally71]

Many Thanks guys

Skidlids .. I take it the 1.5M ECU is off the 750 and the 620 is another variant (escuse my ignorance) .. and I take it the looms are the same??

[skidlids]

Originally Posted by bally71

Many Thanks guys

Skidlids .. I take it the 1.5M ECU is off the 750 and the 620 is another variant (escuse my ignorance) .. and I take it the looms are the same??

The 750SS ie uses a 1.5M ECU, the 620 uses a 5.9 ECU
The 1.5m has a single multi pin connector where as the 5.9M ECU uses two connectors.
As standard the 620 ECU is coded to the Clocks with the Clocks in turn coded to the transponder in the key

As such the looms are very different, even the 750/900SSie had different looms, the earlier one had the fuse box on the fairing bracket the later ones had it next to the battery under the tank, which I have found a lot better for using as a race harness.

This throws another difference into the Mix. The earlier bikes use a A0 version of the 1.5M ECU where as the later bikes/harness uses the A8 version. Main differnce between the A0 and A8 versions of the 1.5M ECU is the way they are interlocked, so can't be swapped from early to late loom and vice versa.

Speaking of 750SSie's and as its sunny out I think I'll take mine for run over to H-Cafe and see who else is out on their bikes today

[skidlids]

Should also mention the Injectors are different, both use 45mm throttle bodies but the 750 uses early type green injectors that flow 270cc/min where as the 620 uses the later Pico Brown Band injectors that flow 330cc/min.

Both use the same Throttle Position Switch and 3-Bar fuel pressure regulator.

Fitting a PC3 USB to either will allow you to fuel Map each cylinder independantly

[Brewmaster]

Keep the info coming Skidlids. I have a 750ie setup for racing and am considering converting it into a 620 class A setup. Any suggestions would be SUPER helpful.

[skidlids]

Originally Posted by Brewmaster

Keep the info coming Skidlids. I have a 750ie setup for racing and am considering converting it into a 620 class A setup. Any suggestions would be SUPER helpful.

Been thinking of doing the same with mine.
Cheapest options is probably to fit 620 Heads (complete) and 620 Barrels and Pistons. Trouble is sourcing them. Otherwise go with a complete 620 Engine (ideally not the Multistrada)

Then try and find someone to lift the 750s Rev limiter (mines set to 10500 rpm) and also reprogram the fueling. FIM software use to do this as does Techno Research's Direct Link software and Dongle. Not sure if the Software Chris at CJS or Mark at BSD can do it, probably worth a phone call

Andy Challis run with a Standard 750SSie ECU setup by MArk at BSD in Peterborough as far as I'm aware and not only won races but also broke Class A lap records, hate to think how well he would have gone with 1500 extra revs available to him

Stick with all of the 750 Electrics, Tacho, fuel pump, injectors etc

I say stay with the early injectors as they match the 1.5M ECU better, the Pico Injectors off the 620 don't fit the 750 throttle bodies and flow 20% more fuel, so would leave the mapping a lot of work to do

This method means you have nothing to do with coded clocks, coded ECUs or keys with Transponders.

Also you don't have to worry about the weak point of the 5.9M ECU as used by the 620 where it is possible to loose a ignition coil output driver leaving you with a single cylinder as it did with me at Snetterton this year and Pembrey Last year, on both occasions they were wet races. Many of my connectors are now filled with Flowable Silicon to hopefully prevent this happening again

[bally71]

Cheers fella

great info

take it i'll need a Power Commander to sort the fuelling and there's no clever way of fettling the ECU is there?

Just on that point I've been offered 620 donor with no keys (legit obviously) ..
If I took it on is it a major ball ache to have it recoded? ..

Can you have a keyless setup with the newer electronics?

[antonye]

Originally Posted by skidlids

Then try and find someone to lift the 750s Rev limiter (mines set to 10500 rpm) and also reprogram the fueling. FIM software use to do this as does Techno Research's Direct Link software and Dongle. Not sure if the Software Chris at CJS or Mark at BSD can do it, probably worth a phone call

Andy Challis run with a Standard 750SSie ECU setup by MArk at BSD in Peterborough as far as I'm aware and not only won races but also broke Class A lap records, hate to think how well he would have gone with 1500 extra revs available to him

I bought the TechnoResearch kit and tried to change the ECU on that bike when it was mine, but I could never get it to work properly. It would see the ECU and could communicate, so you could read settings and see things happening, but it would not dump the ECU and allow me to change things.

Despite numerous attempts to contact TechnoResearch, I never got any support from them!

I passed the kit on to Mark for use on his BlackBeast, but I don't think he's used it yet (so the dongle is still unused) so he may well be willing to sell it on.

But anyway, I now have some different kit which allows me to read and write 1.5 ECUs. I have a couple on my desk (one is a DP version) to play with, so if anyone wants to have a fiddle, let me know.

And of course I can also remove the immobiliser from 59M/5AM model ECUs (as well as reflash and remap) if anyone wants to go keyless!