Quote:
Originally Posted by CAOZKAN
What about the difference between titanium and normal ones? Do they also worth the price difference at low octane fuel range?
|
Originally, the main purpose for the KRAS55Ti option was to combat HCF (High Cycle Fatigue) for the endurance race cars we develop turbos for. HCF is a result of constant high load cycles for extremely prolonged periods of time. In addition HCF can cause wheel deformity resulting in loss of compressor efficiency. Being that Titanium is denser and has an average of 5 times more fatigue strength and 3 times more tensile strength than billet aluminum, it lends itself to be a perfect match to negate theses issues for endurance race cars. Also, since titanium is more dense it results in much broader torque bands due to the inertia it carries. Lastly, our engineers can be much more aggressive with blade pitch design, angle, and contour than a standard aluminum billet compressor wheel due to it's increased fatigue and tensile strength. This results in the ability to also produce more power in a given dimensional area.
In regards to the additional cost of the titanium being worth it for pump fuel is relative to your use. Being that it's a more aggressive design and higher flowing wheel, it will produce more power even at pump gas boost levels as compared to our standard billet option. However, that power difference will increase exponentially as boost increases with higher octane fuels. For most daily driver street cars though, the KRAS55Bi would probably be the more cost effective option for pump gas as the difference in power at that boost level is more so a limit of octane rather than flow capability.