I am new to the forum so bear with me on posting issues.
Over two years ago, having just restored an old GT750, I decided it might be fun to take one of those bikes and push the design as far as I could.
Two years down the line and pending paint and final EFI work I have this.....
I wanted a suspended and tucked engine so started with a VFR 800 frame and designed new suspension/engine mounts to graft in the SS swing arm.
I hated the front radiator on the GT so found a nice underseat Benelli Tornado option which meant adding the Benelli subframe and fans.
Front end is Suzuki GSXR 750.
Clocks are suzuki Bandit ....and there are various other bits from around 13 bikes now.
The main bike is Arduino powered (including the clocks) and includes;
RFID ignition lock
GPS
Digital speedo and tacho
Electric water pump and fan management
Proximity sensor alarm
SD card logging
Real time clock
The engine mods are broadly speaking;
Ported near to TR750 specs
Reed valves
Dry clutch
Close ratio gear box
Custom exhausts
Replaceable (tuneable) squish heads
Zero deck O ring head
For its first dyno run I have carbs fitted but have started an EFI project with a speeduino.
I have also managed to get a set of Triumph Tiger throttle bodies working with fly by wire throttles so plan to use them in the EFI.
I've got to the point with the speeduino where the basic ignition is kinda working except the spark modes I can find dont allow me to run 3 independent ignition channels which is my first hurdle.
I've done lots of reading especially on TZ350 excellent thread here (and still have lots to read) and am just getting into the fuel planning for the EFI. I believe the summary of what I have read includes;
1. Although my engine is relatively low revving (8.5k peak power), throttle body injectors probably wont work so I need transfer port injecting
2. The Kettle has two ports so do I need one injector per port? I assume so?
3. Best position is probably to squirt under the piston
4. For smooth running I may need to consider TZ350's pseudo MAP approach, so a MAP sensor in one cylinder under the inlet reed is probably best?
5. From a injection timing perspective, is it better to start injecting on the down stroke or wait until BDC and then inject until the transfer closes to get best mixing?
6. I probably need an injector flow of around 300cc
7. Given my rev range I shouldnt need staged injectors (small/large) although bottom end response might benefit from it.
8. With my Spark and VE tables on my Alpha N system, keep the steps leading to peak power fairly short
As I get into the injector choice/setups I am sure there will be more observations/questions, the first one that springs to mind is how much fuel am I trying to inject at each squirt and what calculates it?
I will post some more detail of the build thus far and the EFI work as it goes on.....Hope this helps...
Bookmarks