Im running a turbonetics single turbo and u just got new mods done to my car. Now im able to run 9psi boost and have a utec installed also. Whenever i go to WOT and hit 4k rpm i hit fuel cut. My car was just dyno tuned and was doing perfect. I asked a few of my friends if they knew what was up and then one of them asked me what size injectors am i running, i said i was running 440's and he said that was too small. Is this the case?? Help someone. Should i be running bigger injectors?

 

680 i would say

 

I would say your overboosting.A known and common problem with the TN ST kits.
We uses a softer WG spring and tune the boost up to where we want it.
At 7-8 psi 440 is fine, otherwise step up to a 550cc.

 

oh yea i forgot to mention. im using an apexi electronic boost controller, on setting A is where i have it set to wastegate (4psi) and on setting B i have it set at 9 psi. its happening on both settings so i know i cant be over boosting.

 

Sure it can..If a vacume line came off, or the WG pipe cracked at the flex joint which is VERY common on the TN kits.
Also, what is your fuel cut set at?You may have made 9psi on the dyno, but on the road you will make more and overboost.

 

makes sense, ill check it out today. is this crack visible? ill lso check th vacuum lines. thanks for your help!