why does my grand national break up at 10 lbs psi

[nash421]

hey fellas, looking for some feedback. Just installed 60lb injectors, turbo tweak chip, houston dp, custom intercooler, hbc, headers. having trouble getting past 10 lbs boost and it breaks up either at 1st to 2nd shift or 2nd to 3rd shift. it varies... no vacuum leaks anywhere... scratching my head

 

[Pronto]

Coil, wires, sparkplug gap.

 

[TurboTnZ06]

Depending on the build, maybe the MAF sensor is maxed out? Does it hit 255 on the scanmaster/log at 10psi?

 

[nash421]

I checked the ignition coil and it was fine, new plugs and wires. I don't have a scan master yet. Ordered it and waiting so maybe I'll get some answers then

 

[Rafs-T-Type]

Be nice to her until you get the scanmaster.

 

[Amelio]

Is this happening only at WOT from a launch or does it still do it if your in 2 or 3rd and you roll into it?

 

[Chuck Leeper]

While you are getting the SM, get a fuel psi gauge you can read from the dr seat...

 

[STP]

I'm betting it's a rich condition...Pop a plug out and have a look. Hearing any detonation? If not, leave the boost at 10lbs and take a couple lbs of fuel psi at a time out of it. See what it does.

 

[Ttype6]

Does it do it du

hey fellas, looking for some feedback. Just installed 60lb injectors, turbo tweak chip, houston dp, custom intercooler, hbc, headers. having trouble getting past 10 lbs boost and it breaks up either at 1st to 2nd shift or 2nd to 3rd shift. it varies... no vacuum leaks anywhere... scratching my head

Does it do it during a shift or at a certain boost level?