My car runs like ----.. this is a freshly built ka-t with 0 miles on the motor. At idle i only get 10" of vacuum and i don't have any boost leaks. Where could my vacuum be going?

right now, it idles fine and starts right up.

if you punch the gas it stumbles over itself from about 1-2.5k rpms.... then it revs up to about 3-3.5 but not any higher. somethimes i have to feather the gas to get it that high or it just coughs and dies. What could be causing this? I just checked my afc wiring and settings, i unhooked the bov, so it's not open and not leaking at idle, i don't have any major boost leaks, and i have no idea what to check next. any suggestions?

 

same thing is happening on my freshly built Z6 but im uber rich at idle and uber lean uptop... let me know if you figure anything out

 

timing?

 

ill check the timing again... it's at about 24* btdc.. stock is 20.

 

Big vac leak. get some carb clean and go to town.

 

it's not a big vac. leak... i hooked up a boost leak checker all the way on the turbo side of the piping and pressurized the whole system. There were some small leaks i plugged, but nothing big enough to do this.

.. you'd think it would be though.

 

is there an exhaust restriction or something? From your description it sounds like the motor wants to run (that is, if it is idling smoothly), but something is preventing it.

 

is it a steady 10? or does it fluctuate at all?

valve lash

 

turns out it was timing mixed with just being a new motor. thanks guys