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Fitting Fuel Injection Throttle bodies

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Guest

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

thanx
 
The 78 intakes are restrictive, small. You would have to make your own adapters or use a later head
 
SqDancerLynn1 said:
The 78 intakes are restrictive, small. You would have to make your own adapters or use a later head
Click to expand...

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.
 
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?
 
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
 
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
 
humhead said:
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
Click to expand...

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
 
Now this got me thinking about if a GSXR 600 engine would fit in our frames.... :)
 
Your saying a 1100G head would fit on a 78/79 gs1000 motor?
Click to expand...
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
 
An engine swap may be your best bet in the long run unless you just enjoy long hours and a challenge.
 
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.
 
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.
 
You got the megasquirt to work - Cool! could you share some pics/Info?

Terry
 
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:
db_1_b.JPG
 
Thanks for the pic. What year/model GPZ has those throttle bodies?

Terry
 
I Think they are from an 83-84 1100. They are also available for a 750 and a turbo version of both displacements, the only difference being injector flow rate (as far as i know).
 
That would work. Intakes would be fine. You need to ask for a photo of the exhaust ports. That's the only way to tell if it's the 'best' type.

Terry
 
hi im just wondering ...i have a twin motorcycle if i got two separate throttle bodys or on bigger one with a manifold and i had small injectors from a car installed aiming right into the head had them triggered by the left right coils and had the right amount of pressure into the small rail would it run and if i had a throttle position sensor (the only sensor) control how long the injectors stay open somhow with a relay do you think this would work...adjust leanness and richness by the injector fuel pressure regulator........kinda cool do make somthin like this work
 
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