MustangStef/Hayabusa

Current Project : Hayabusa 1300cc engine

Short description

4 Cylinders

Bore 81mm

Stroke 63mm

4 injectors 24lbs

4 COP spark plugs

VR sensor on Crank

VR sensor on Cam

Modified engine with lots of compression

Progress until now :

Stock wheel on crank has 8 evenly spaced teeth. We have modified this wheel so now it has 24-2 teeth.

The stock injectors are placed under the butterfly, this was modified so the injector are above the throttle bodies.

Do i set setting to port or throttle body?

I am familiar with this kind of tooth wheel.

When i crank the engine with the spark plugs removed, i can adjust the reference as i wish.

When i crank it with the plugs installed, the RPM is so irregular that i cannot get the engine to start, not even with the adv filter.

I've recorded the signal and put it at http://www.vems.hu/files/MustangStef/Hayabusa/busacrank.wav

The same wheel on a standard engine with normal compression works just fine.

Is it possible to extend the range of the adv filter?

When i strobe the engine with spark plugs installed, i find tdc on 90, whereas the same procedure without spark plugs installed gives 63 degrees.

Ignition timing is way off during cranking.

I can solve this by using 90 reference and offset my sparkmap with 27 degrees.

Wouldnt it be possible to have a negative advance during cranking?

When we pull the car it starts, and everything seems normal.

I have the tables and config but with the filter setup for the standard engine :

http://www.vems.hu/files/MustangStef/Hayabusa/config.txt

http://www.vems.hu/files/MustangStef/Hayabusa/tables.txt

15 APRIL 2008 :

Tried to feed the starter with 24V instead of 12V. Cranking rpm goes up to 510 rpm. In this setup engine starts very well. I dont have any trigger errors anymore.

Still i would like to be able to start on 12V. Anyone has any ideas?

High CR Busa's seems to have problem with starting kickback.

One solution (still 24V though)http://aperaceparts.com/tech/batteries.html

or more powerfull starter.

SeppoRepo?