XavierSPL

I've tried my best to research this on my own but still have questions I'm hoping someone can help with;

I'm trying to figure out what the best turbo to use on my bike would be. I have experience with turbo and supercharged cars but am skeptical that the rules are all universal when it comes to a high revving bike engine.
I have a oil cooled GSXR 1100 and I used a calculator to determine airflow needed, but max RPM is 13k on this engine and I'm lookin for moderate boost (6-7psi) and want to maintain drivability around town, etc..The calculator comes gives the following;
1127cc = 66.87ci so airflow needed would be 238cfm. But if I plan on hardly ever being at 13k rpm should I even be using this?
I don't mind doing leg work and figuring this stuff out on my own, but it's a lot tougher to figure this out for a bike (when there is much less documentation out there.)
So far, I've been considering a Mits td04, a GT25, or a TB25.. From there, I have no idea what to look at for pros or cons.. Anyone have any opinions or a place to point me?

XavierSPL

Maybe someone can at least tell me what they think of this map:



This one seemed better then others I checked, but I'm not exactly sure what good looks like here..

busa4

nice little turbo for a bike application. ive used them twice for turbo bike builds. if you look at the chart were it says 70% efficiency, you will see the rpm the turbo needs to achieve that efficiency on your engine. in this case the turbo will need to spin to ~150,000 rpm to achieve the 70% efficiency so there will be some lag time. both the bikes i built with the t25 spooled at ~6000 rpm. yours maybe a little lower since your looking at the ball bearing version. if you want lower spool times see if they have smaller exhaust a/r versions.

XavierSPL

Thanks for the help Busa!

Dropping to .6 a/r gives the following:



Looking for one that hit higher efficiency at lower rpms, I came across a TD05 (18g) as well, but have never heard of anyone using one. This is the map:


If I want the boost range to start at around 4k and peak around 10k engine rpm, do either of these really give any insight to that?

busa4

18g is a big turbo. i know there are a lot of hayabusa kits out there using the 16g turbo and they spool pretty quickly. ~1500-2000 rpm. i wouldnt go with the 18g as it is overkill and you will never need that much airflow.

XavierSPL

I actually mapped the 16g earlier today and that seems to be the best fit, and seems easy enough to find for good prices..

busa4

i think the 16g will work out nicely....