HOW DID WE GET ALONG WITHOUT THE dbb,gt,gtq,ect,ect,ect.

The 7668 precision was my favorite all around turbo on this car, and it was on a lower compression, small valve heads, and the front mount.
interesting take,i know the low comp stuff can work and gives one a bigger tuning window,but on the 109 they seem to love more comp,seems solves alot of issues when trying to make the power.
 
Now how does e85 change the spool up characteristics of the bigger 7168s and gtq's on a 109? does journals behave as bb's?
 
Now how does e85 change the spool up characteristics of the bigger 7168s and gtq's on a 109? does journals behave as bb's?

Ethanol will increase exhaust energy. With a properly built engine spooling just about any those small t3/t4 based turbos is not a problem. Journal bearing or ball bearing. Spooling from launch boost/rpm usually in under 1 sec


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