ECU's

[megabeast]

I posted some time ago about my dodgy ECU - apparently the DTA one i have just wont work properly with my hayabusa no matter how many teeth on the pick up disc. Westfield directed me to SB Dev's ECU. They were very helpful.

Does anyone have any advice on the best ECU for a hayabusa, what does everyone out there use?

I dont want to pay a fortune as my car is only a weekend blatting fun car, not for competion, but dont want to go cheep and buy the wrong one.....help would be greatly appreciated.

[Blatman]

apparently the DTA one i have just wont work properly with my hayabusa no matter how many teeth on the pick up disc.

Which DTA ECU do you have?

What is the problem exactly?

Why can't you use the ecu off the bike?

[Arm]

Thought the dta would accomodate most trigger wheel combinations ?

[megabeast]

Not sure the exact spec of DTA as am in office but its about 4 years old. I did not build the car so came with DTA fitted. The problem is on starting - it really does not want to! There is a lot of kick back on the starter. When I spoke to SB Dev they say this is a common problem with DTA and that is why they have programmed their ECU with something called "soft start" specifically for hayabusa engines.

Spoke to DTA they say their ECU will work with 12 or 24 teeth (I had 29) so thought had solved problem so had new disc machined to DTA spec and still not working.

DTA did add that they were surprised that the engine ran at all with their ECU. Apparently the DTA unit does not use all the sensors fitted to the hayabusa so suggested I use the original bike ECU (which I dont have)  

So I may have to give up on the DTA and get one from SBS unless anyone has any thoughts?

[Johnson]

Check the for sale section Carl Meek is selling two OE ECU's for Busas.

Not sure what year his ones are but you never know  

[Blatman]

The problem is on starting - it really does not want to! There is a lot of kick back on the starter.

Sounds like a simple timing issue to me. Too much advance at start up. Back it off a bit (or a lot) depending on what it's set to now. Do you know what it is set to now?

If it ran before with this set up, it should run again as long as you haven't changed anything irreversibly...

[megabeast]

Will check out the for sale board thanks very much.

Re timing, will have a look at it as nothing else has changed on the car since it was running ok. It has never been the easiest to start but had a good summers use out of it last year, thats why there has been much scratching of heads. Everything else has been checked, fuel, spark etc - thanks for the advice

[Blatman]

If you can, try to find out how much advance a 'Busa has as standard for both hot and cold start up routines and ncompare it to what it has now. Even a few degrees difference can make it hard to start. Set the DTA to what it should be as standard and try it. The beauty is, once the lap top is hooked up, you can try it several times with several different advance values until you find one that works as you want it to.

There is no electronic or mechanical reason why an aftermarket ECU like a DTA (or an MBE, or Emerald, or whatever) can't start and run a car from cold just as well as an OEM ECU. It just takes time to get there...

[megabeast]

Thanks so much for the advice, for someone like myself with the tech knowledge of a knat its hard to come up with any ideas or solutions!

will keep you posted with any results....cheers

[Arm]

I'm sure there is a facility in the dta software  to retard the ignition to help with starting issues as this.

If it runs with the dta then I'm sure the starting can be sorted.

[Luke Algar]

Hayabusa engines definately run with DTA. Run one for the past 4 years at least, it does sound like its the trigger wheel thats not quite right, is it 12volt starting or 24 volt?

[Guest]

I do indeed have an entire wiring loom and two ECU's - one from 2007 engine one from 2000 engine, both slightly different.

[Arm]

Get into the software and see what the 'Firing Tooth on Startup' is set to.

[megabeast]

Thanks for advice once again - i will look at the retardation issue to see if that helps. Re 12v or 24v its 12 v.

Interested to hear that on of you guys has been running a hayabusa on a DTA for 4 years, what type of trigger dics do you run, 12 24 or 24-1? As i think this may also be a factor. Have you ever had starting issues?

[Luke Algar]

Only ever had starting issues when the wrong generator wheel has been in the engine as one engine runs 24v the other 12v. I'm unsure as to which trigger wheel we use as my father is the one who deals with it all. I shall ask him though and get back to you asap. The only other starting issues we've had is when the battery hasn't been quite right and it just wouldn't turn it over quite right.