GPz550 H1 EFI Conversion

Hi all,
I'm looking at DIYing a fully reversible efi conversion on one of my bikes using a 550 H1 engine.

I'm probably going to go the Speeduino ECU route

First thing to do is design and print a 4 to 1 intake that will fit the 34mm throttle body I've decided to use and run a single injector at the intake.
I'll be running a TPS, IAC, MAP, WBO2 and a head temp sensor, I think that'll be all I need to get a decent tune.

I have a few questions, I need to know is how many pulses per cycle the stock ignition produces and does anyone have an ignition timing chart? Need to know if I can still use the stock ignition pickup and make it work with a single injector.

Thanks

There is an ignition timing graph in the manual, interesting project 

Fady wrote:

First thing to do is design and print a 4 to 1 intake that will fit the 34mm throttle body I've decided to use and run a single injector at the intake.
 

Not sure on your educational or experience background but sounds like you’re going to have to work really, REALLY hard to get an equal fuel distribution for each cylinder.  A single throttle body and 4 injectors will be a much better running setup IMO.

Later, Doug

StreetfighterKz wrote:

Not sure on your educational or experience background but sounds like you’re going to have to work really, REALLY hard to get an equal fuel distribution for each cylinder.  A single throttle body and 4 injectors will be a much better running setup IMO.

Later, Doug

The main reasons for a single injector at the throttle body is the ability to use the stock ignition triggers and because the strokes are evenly distributed (180° apart), there will only ever be 1 cylinder on it's intake stroke are any one time, so fuel distribution shouldn't be an issue. The biggest challenge with a custom intake and limited space is keeping the runner length as close as possible, this is where the design of the plenum is important.

maybe sonthing simmilar to this, just remember this is a rough idea, spent 20 minutes on it.

Or somthing like this 

How are you going to fabricate the manifold?

I designed a plenum for a roots supercharger I was going to use on a Z1 drag bike but I abandoned that project and sold everything. I figured out my engine needed to be 300cc larger to run that blower efficiently.

Any NA design on the intake side needs to be equal length and smooth transitions, much more so than forced induction. You still need to have clear separations at the one to four junction. The second picture is getting close but is only achievable as a welded tube structure.

Injected wrote:

How are you going to fabricate the manifold?

I designed a plenum for a roots supercharger I was going to use on a Z1 drag bike but I abandoned that project and sold everything. I figured out my engine needed to be 300cc larger to run that blower efficiently.

Any NA design on the intake side needs to be equal length and smooth transitions, much more so than forced induction. You still need to have clear separations at the one to four junction. The second picture is getting close but is only achievable as a welded tube structure.

 

I'll be 3D printing it in ASA or ABS to start and when I'm happy with it, I'll probably get it metal 3D printed.

I'm doing this for shits and giggles, not racing or anything like that, I just want to see if I can build a fully reversable working system, as easyily and cheaply as possible and one that will hold a decent tune.

I've already found a 32mm throtlle body with 44lb injector, TPS with IAT and Stepper IAC, a internally regulated fuel pump and a WB02. The only thing I havn't worked out yet if what I'm going to use as a head temp sensor, as it's air cooled.

Fady wrote:

Injected wrote:

How are you going to fabricate the manifold?

I designed a plenum for a roots supercharger I was going to use on a Z1 drag bike but I abandoned that project and sold everything. I figured out my engine needed to be 300cc larger to run that blower efficiently.

Any NA design on the intake side needs to be equal length and smooth transitions, much more so than forced induction. You still need to have clear separations at the one to four junction. The second picture is getting close but is only achievable as a welded tube structure.


 

I'll be 3D printing it in ASA or ABS to start and when I'm happy with it, I'll probably get it metal 3D printed.

I'm doing this for shits and giggles, not racing or anything like that, I just want to see if I can build a fully reversable working system, as easyily and cheaply as possible and one that will hold a decent tune.

I've already found a 32mm throtlle body with 44lb injector, TPS with IAT and Stepper IAC, a internally regulated fuel pump and a WB02. The only thing I havn't worked out yet if what I'm going to use as a head temp sensor, as it's air cooled.

The KZ1000G (classic) and GPZ1100 are both injected air cooled bikes that run a head sensor, you could take a look at their set-up

Wookie58 wrote:

The KZ1000G (classic) and GPZ1100 are both injected air cooled bikes that run a head sensor, you could take a look at their set-up

 

Thanks mate, I'll check them out. havem't had a good look at the head yet, they somtimes have a spot for a sensor, but either way, I'll made it work.

On one of my builds I am converting a KZ650 to run fuel injection using GPZ1100 throttle bodies. I am not using anything else from the GPZ1100 so I needed to come up with my own sensors.

I was able to use NTC Thermistors for both the intake air temperature and the cylinder head temperature sensors. Pretty easy to wire up and put in a self fabricated housing plus they cost next to nothing.

 

 

 
 

Injected wrote:

On one of my builds I am converting a KZ650 to run fuel injection using GPZ1100 throttle bodies. I am not using anything else from the GPZ1100 so I needed to come up with my own sensors.

I was able to use NTC Thermistors for both the intake air temperature and the cylinder head temperature sensors. Pretty easy to wire up and put in a self fabricated housing plus they cost next to nothing.

 

They look spot on.

Did you just crimp the terminal over it and bolt it down under a valve cover bolt?

Fady wrote:

Injected wrote:

On one of my builds I am converting a KZ650 to run fuel injection using GPZ1100 throttle bodies. I am not using anything else from the GPZ1100 so I needed to come up with my own sensors.

I was able to use NTC Thermistors for both the intake air temperature and the cylinder head temperature sensors. Pretty easy to wire up and put in a self fabricated housing plus they cost next to nothing.



 

They look spot on.

Did you just crimp the terminal over it and bolt it down under a valve cover bolt?

 

Yes it was crimped but very lightly then secured further with heat shrink. I was afraid I would crush it so I measured it and ground a nail the same size to slip in the the end of the lug ID then crimped. The heat shrink sealed the end off, that is why I have it zip tied to that aluminum piece so it does not get yanked out. The round aluminum is a stand off for the sensor mount location on the head.

I am using a later 750 Spectre head that has the same cast lugs on it as the GPZ750 Turbo only its not drilled and tapped. Below is a pic of the temperature fitting on a turbo head.