[JrZook]

Well this may interest a few of you tech heads out there!

Well been pretty flat out at uni these days all well as being tied up in other projects but I have slowly been working on and collecting parts for my latest bike project.

So I'm attempting to EFI my XV250 suicycle as I will help in the long run especially if the turbo eventually finds it way on there plus I think it will be a pretty good project

This fuel injection system is going to be completely custom from the injection manifold to the hardware as well as the software and tuning. It's a project Ive been wanting to test my skills on for a while! It will be a fairly long term project as there is craploads to do, design and test. I have got most of the parts collected to complete the project so here's a run
-down of what I have in mind:

Sequential injection
Ignition timing control
Custom siamese copper intake manifold
Yamaha R6 denso injectors
Single R6 EFI 38mm CV type throttle body
CBR 125 intank high pressure fuel pump converted to external inline use

The PCB in using is of my own design and is based around an atmel atmega 32 micro-controlled running at 8MHz. It has 2 injector as well as 2 coil drivers. Inputs will come from the stock crank reluctor pickup as well as a custom cam sensor. It will also be using the following sensors:

Throttle position (TPS)
Manifold air pressure (MAP)
Manifold air temp (MAT)
Engine temp
Battery voltage pickup

The fueling algorithm for now will be based on a volumetric efficiency (VE) map but later may include an alpha-n based map for lower engine speed if the MAP is not stable enough at low speeds.

Here are a few pics for now. I just got the PCB back and it will be the first prototype for the project. More pics to come!!




Top Side


Bottom side

Enjoy!!
Dan

[royce]

Watching

By CV style throttle body you mean a slide throttle style thing?

[Teracis]

Nice, this sounds like an interesting project, got any pics of the bike as it stands now?

[JrZook]

royce wrote:

Watching

By CV style throttle body you mean a slide throttle style thing?

Correct! The Keihin EFI throttle bodies on the R6 still use a slide to keep the air velocity up, unlike a more complicated secondary butterfly system controlled by servos on other bikes. Simple yet effective

[JrZook]

Teracis wrote:

Nice, this sounds like an interesting project, got any pics of the bike as it stands now?

Well this is when I just got it on the road:



and the baby snail for it



Currently sits 3inch lower front and rear then in those pics.

Specs:

'94 yamaha virago XV250
Air/oil cooled 250cc, 60 degree odd fire v-twin
26mm single carb
21Hp stock!
16.8sec 1/4 mile (my best so far)

Aiming for 30Hp-ish with EFI
40-50 with EFI turbo
looking for 13-14sec 1/4mile times

Dan

[Fatzook]

somebody needs a manifold

[boostedbrick]

That turbo is gonna be a nut warmer
What are you looking at for oil feed on this dude? Im assuming taping a head feed would be easy on these motors but probally not enough pressure for a turbo, plus the chance of starving the head

Be cool to see how the EFI set up works

[Teracis]

Bloody hell a 100% increase in hp is a fair target!

Good luck with it all, Hopefully you work out all the kinks without having it lock up on you or something dodgy while you're riding!

[royce]

JrZook wrote:

royce wrote:

Watching

By CV style throttle body you mean a slide throttle style thing?

Correct! The Keihin EFI throttle bodies on the R6 still use a slide to keep the air velocity up, unlike a more complicated secondary butterfly system controlled by servos on other bikes. Simple yet effective

and no restriction when open

How about powering it? does the stator have enough reserve juice in it?

[shakes]

be following this with interest. a mate is thinking of going EFI on his postie bike. simply because he is an electronics nerd and wants to build it from scratch

[JrZook]

Fatzook wrote:

somebody needs a manifold

Yes Sir!!! I have everything here and waiting

[JrZook]

royce wrote:

JrZook wrote:

royce wrote:

Watching

By CV style throttle body you mean a slide throttle style thing?

Correct! The Keihin EFI throttle bodies on the R6 still use a slide to keep the air velocity up, unlike a more complicated secondary butterfly system controlled by servos on other bikes. Simple yet effective

and no restriction when open

How about powering it? does the stator have enough reserve juice in it?

Yea the stator was a bit of an issue to work out. They main extra sucker for power was the fuel pump so it took my a while to find one that will do the job. The one I have has ample flow and pressure and only uses a measly 2.5amps!! The stator should keep up, I hope!!

[tanshi]

your a freek Dan! looking forward to this!!

[Chop]

This is sweet, be interesting to see how she goes afterwards

Ive been looking at a few old bikes lately, wouldnt mind converting one into a bobber

[royce]

how would this go on a 4cyl engine with 1 throttle body, 2 injectors and 2 wasted spark coils?

[JrZook]

royce wrote:

how would this go on a 4cyl engine with 1 throttle body, 2 injectors and 2 wasted spark coils?

What are you thinking? Mini with split runners? The hardware will support it and once ive written the software it should be able to be adapted.

[royce]

looking around at alternatives to a points dissy and stuff exisits but everyone that makes stuff for minis seems to think they are the most important person in the world and their gear is the best in teh world so you have to almost beg to be ripped off and buy their stuff

So I figure 2 birds one stone with some simple efi, but I am too stingy to fork out for the cool stuff

I would only need a crank trigger yeah? it wouldnt need a cam sensor to know what cylinder it was really on would it?

[JrZook]

royce wrote:

looking around at alternatives to a points dissy and stuff exisits but everyone that makes stuff for minis seems to think they are the most important person in the world and their gear is the best in teh world so you have to almost beg to be ripped off and buy their stuff

So I figure 2 birds one stone with some simple efi, but I am too stingy to fork out for the cool stuff

I would only need a crank trigger yeah? it wouldnt need a cam sensor to know what cylinder it was really on would it?

Both would be best but to keep it simplistic you could just run a cam pickup (or modify the dizzy) and make up a trigger system with a longer tooth/pulse to detect home of cyl 1

[steak_knife]

5k dizzy & use the pick up as a cam pos in the mini housing

[royce]

A, Mini dissy spins backwards
B, still has slop in teh drive system
C, No Toyota shit in the mini, ever

[TZAR]

For Royce

ea falcon throttle body
simple throttle position switch and two injectors. Run one for standrad drive and then have second come on for full throttle

For Dan
Go hard son

[royce]

TZAR wrote:

For Royce

ea falcon throttle body
simple throttle position switch and two injectors. Run one for standrad drive and then have second come on for full throttle

For Dan
Go hard son

for Jock err TZAR
in a falcon the ECU does strange stuff so the injectors only fire every second cycle cause they are so big,m a mini stands no chance, and its hard to turbo stuff with it cause the pressure reg is all wrong

[JrZook]

TZAR wrote:

For Dan
Go hard son

Thanks Tzar!

royce wrote:

for Jock err TZAR
in a falcon the ECU does strange stuff so the injectors only fire every second cycle cause they are so big,m a mini stands no chance, and its hard to turbo stuff with it cause the pressure reg is all wrong

Im still skeptical about these 'issues' and weird happenings with this TBI system. Does anyone know what size injectors they actually run. Whats your mini royce? 1100, 1275?

[royce]

1098

Its in the Factory service manual, at idle and jsut of it only fires the injectors half the time, you can run the engine and slowly bring the revs up and hear where they click over and pick up the pulses

In a mini the manifold to fit it will be shit and cost you power, theres pretty solid info on what works and not, being its a 50 yo design and all

[JrZook]

Does the factory service manual give you an injector size?

[royce]

dunno, havent read one for many years

[JrZook]

Bit of an update:

Managed to pretty much finish populating the PCB!!



Now its on to testing the PCB, write some code and test some hardware!!

[bazook]

smart man hope it all works out

[SierraDan]

Awesome!

[shakes]

I wish I had the attention span to sit down and learn this sort of stuff.

Keep the updates coming!