logs, airflow, studder, and fuel cut

[pickens]

Here's the deal. I think its time for an afc and 550cc injectors because if I run anything over 15 psi, I get a studder between 4-5k rpm, but then it pulls fine to redline. On the log, it looks like timing is pulled for a second at 4.5k rpm, and then goes right back up until redline. Is this fuel cut? I searched and I read fuel cut was either a complete shut down of the motor, or it could also be a studder. If it is fuel cut, will an afc and 550cc be good enough to get me to about 20psi?

 

[red91tsiawd]

yes it should supply you enough fuel for 20psi on that t-25 but that turbo runs outta breath well before that

 

[awd4g63]

The studder sounds like it's not getting enough fuel, not fuel cut. Fuel cut is simply cutting off all fuel from the engine, saving the engine from high boost levels (too much air getting through the MAS).

 

[DSMJim]

There is no way your going to get fuel cut with a T-25. I turned mine upto 18psi (which drops to 12psi after 5500rpm) with stock pump injectors etc etc and never got fuel cut, even on nice cold nights when your more prone to it.

If your running into a studdering problem then it's likely a boost leak, ignition or some other problem. Fuel cut will give your car a crazy ass backfire and shuts down the motor and other violent acts.

 

[pickens]

I believe my profile is working right????? I don't have the t-25 anymore I'm on a 14b. But yea youre right, if I was on a t-25 there is no way you can get fuel cut. Its next to impossible.

 

[DSMJim]

OK 15psi to redline with stock injectors and MAF may get close to fuel cut so it's possible your feeling the effects.

What I woudl do is tell you to get 650cc though cause they are only slightly more expensive (www.fuelinjectorclinic.com) and will work later on when you can to go larger then 14B. If you never do and get rid of your car selling 650cc injectors is a snap cause everybody is looking for them.

On sale right now.. 650 cc. Peak & Hold - #125-650 set(4)$320.00