runs good threw first and second but when i hit the boost in third threw fifth its trying to cut off...
anyone have any ideas of what might be happening?

 

Did you get it retuned?

 

What is your spark plug gap?

 

This.

 

Could be due to the cooler weather.

 

Doubtful.

 

do u have a upgraded map sensor? u may have it set for 10 but u may be geting some boost creep past 10 which tha stock map sensor will not like. if you havent upgraded then you should or have a boost cut set

 

 

I'm guessing it wasn't retuned. And I bet his excuse will be but I had it tuned already

 

boost cut??

 

On my S300 you can set a boost point to instantly cut power. I think it turns off the injectors if I recall. Anyhow you set it a couple PSI above what you run and if something goes wrong and you have boost creep, failed wastegate etc. it instantly shuts you down when you hit that boost level. First time I ever hit it by mistake while playing around with the boost controller feature I thought I broke the car. It instantly falls flat on its face.
It's possible the OP has upped his boost and hitting such a safety feature his tuner set.

 

OP is a troll!

 

I meant that with the cooler weather it is more common for it to spike and hit boost cut.

 

In my limited experience if using a boost controller then most definitely. The boost controller in my S300 is based on duty cycle of the boost control solenoid. It pays no attention to what the actual boost is from the map sensor (for unknown reason) so cooler weather gets you more boost because the duty cycle stays the same. There is a temp compensator table to play with but I have yet to make adjustments there.

When running without the controller and just using a spring of set pressure I found much more consistent boost as weather changes.

 

what size injectors are you running?
and like above already asked - did you retune? and what is your spark plug gap?

 

you tuner likely set boost cut for 11psi since thats as high as the map sensor can read. they do this for two reasons, one to protect against boost control failire, and secondly for th emoron that just cranks up the boost more than it was tuned for.

you may also be blowing out the spark which i highly dought at 10psi

 

bingo!

 

t3/t4 turbocharger 57 ar
b18b1 ls swap
3'' to 2.5 intercooler piping
2.5'' exhaust straight pipe with muffler
38mm waste gate
p28 map
660cc injectors
spark plug gap .14
and no i figured it could handle the move from 8.5 to 10 psi..
it was tuned on chrome gold by central florida turbo.
anything else?

 

Retune it.

 

How'd you figure that if you had to have it tuned by a shop just to sit at 8 PSI originally?

 

lean is fast right? haha more booost more lean moar fast!!!