Fitting Fuel Injection Throttle bodies

[Flatline_Racing]

I would like to know if/what intake boots i would need to fit 34 mm GPZ throttle bodies to my 78 gs1000.

thanx

[SqDancerLynn1]

The 78 intakes are restrictive, small. You would have to make your own adapters or use a later head

[robinjo]

The 78 intakes are restrictive, small. You would have to make your own adapters or use a later head

Yes, much easier to use the '80 and on head which came with 34mm vacuum carbs as standard, it has the inlet ports to match. I believe Hoomgar is doing such a swap, maybe he can fill you in on the details if you wish.

[Flatline_Racing]

So, best bet would be to find an '80's head. If memory serves me correct, the shaftdrive bikes came with bigger valves, so one of these would be better right?

[humhead]

The best 2 valve head is the late ( mid 82 & up) 1100. The intakes are set up for 34mm CV carbs & the exhausts have raised port floors.
What about port spacing? Are the Throttle bodies spaced the same as a 2 valve GS head?

Terry

[AOD]

I thought about doing something like a GSXR fuel injection setup on our bikes, however you'd have to modify things a ton. It may be worth it in the end...but you'd most likely have to aftermarket with the engine controls to get the tuning right. A stock tuning for a new modern bike will not give you the right amount of fuel for an older air cooled bike.

Also consider you need to install a crank posistion sensor somewhere...as our engines did not have one. Fabbing one into the ignition pickup area is possible...but not easy.

~Adam

[first timer]

The best 2 valve head is the late ( mid 82 & up) 1100. The intakes are set up for 34mm CV carbs & the exhausts have raised port floors.
What about port spacing? Are the Throttle bodies spaced the same as a 2 valve GS head?

Terry

Your saying a 1100G head would fit on a 78/79 gs1000 motor?



On a side note does't having the smaller intake ports work to your advantage because it gives you a high velocity flow

http://mototuneusa.com/homework.htm

http://mototuneusa.com/thanx.htm

-ryan

[AOD]

Now this got me thinking about if a GSXR 600 engine would fit in our frames....

[humhead]

Your saying a 1100G head would fit on a 78/79 gs1000 motor?

Yes. So would a 1000G head. The 78-9 head's ports are too small for all out performance. Suzuki didn't go crazy when the re-designed the head. Remember 1100Gs came with 34mm carbs - Still small by modern standards.
The exhaust ports are also much better. They raised the port floor.

Terry

[Anonymous]

An engine swap may be your best bet in the long run unless you just enjoy long hours and a challenge.

[Nerobro]

Depending on the EFI you go with, you can actually get away without a crank position sensor. So long as you have a rough idea of rpm, and don't mind batch fireing the injectors.

IIRC there was a bosch system that used a TPS and MAF sensor to do everything.

I am not one to reccomend pulling the efi from another bike to do this. Especially with the price of aftermarket EFI control boxes.

[Flatline_Racing]

I will be running a Megasquirt DIY fuelinjection controler which does not need a crank sensor and can pick up the RPM from the negative terminal of the coil. I have already done the conversion on a kawasaki dragbike, but due to MSD Ignition problems it is not working past 6000RPM.

[humhead]

You got the megasquirt to work - Cool! could you share some pics/Info?

Terry

[Flatline_Racing]

I'll try to get some pictures, I don't have any right now. The drag bike has a front mounted garret turbo running 24psi of boost through the same type of throttle bodies that i will be putting on my bike. It runs on a 10" car tire and will have NOS next season. Before the fuel injection it had been as low as 8.9 in the 1/4 with a rayjay and a S&S super bee draw though system.

These are the throttle bodies i will be using:

[humhead]

Thanks for the pic. What year/model GPZ has those throttle bodies?

Terry