Fuel Injection Conversion

[jaysihn]

it should probably make a little more because of the added resolution I'll have in tuning. I am able to tune pretty much any spot in the rpm vs. manifold vacuum graph to have its optimum amount of fuel.

but i agree the improvement probably wont be much.

[ArttuH]

I agree, EFI shouldn't add much power by it self. But when you replace stock CV carbs with larger throttle bodies it may gain some. And with EFI large throttle bodies doesn't hurt low end like with large carbs.

I got 14 hp more and loads of low to mid range torque to my stock GS1100. And I'm using just 34mm throttle bodies. But I guess that big part of this improvement came with new exhaust which I made at the same time.

[jaysihn]

I spose the turbo didn't hurt either

[ArttuH]

I spose the turbo didn't hurt either

That's completely different story. The bike haven't been on dyno with the turbo yet. I except a bit more than 14 hp over stock with it

[jaysihn]

GOOD!

I was just playing :-D

[AOD]

What size turbo are you using on the GS1100? Comp and turbine wheel.

I'm in the turbocharging industry...so I'm curious.

~Adam

[jaysihn]

from his website http://193.166.80.101/mopo/

Garret GT1749V (VNT) from 130hp Golf TDI, external waste gate

[ArttuH]

Yes, the turbo is Garret GT1749V. Compressor side is 49/35 mm A/R 0.46, turbine is 43/36 mm A/R 0.61. Works pretty fine, starts to boost even below 3000 rpm and doesn't choke badly at top end. But I would recommend something slightly bigger, even for mild street setup. And I'm not absolutely sure if the VNT mechanism is worth of all extra complexity (external wastegate and vane control).

Actually I didn't select this turbo for the project. I just got it for very cheap, estimated that it should work and decided to start an experiment. Bad way to start a turbo project, by the way If you do it in proper way it will be damn expensive anyway. So it's better to select as suitable turbo as possible, it won't affect much to total cost.