only hitting 10 psi, gmpp header, typhoon intake, where do i start? car needs a tune-up for sure. other than that what would be causing it?

 

Since when? Any other issues? What was it before?

Gonna need more info if you expect help on issues like this.

 

since like a year, then i noticed that i had a crack in the exhaust manifold, thats when i changed to the gmpp manifold. still 10psi, recently changed mass mair flow sensor. and sc belt.

 

stock pulley? its only 12 psi stock i think
maybe a faulty bypass valve?

 

i though it was 14psi

anyway i can barely go pass 200km per hour
i can usually go like 220-230

 

i checked the bypass valve and the hoses they seem nice and tight.. anyone has a guide for a complete tune up?

 

hmm sounds weird probably nothing mayjor i wis i had mine running id run out and see what the boost should be at

 

i got concerned when my friend that is red seal mechanic who used to own the same car hop in and try to hit 220km and iwas just not happening then i was like well seems like there is something wrong because he said his was much quicker

 

maybe dirty injectors or pluged up fuel filter

 

my fuel filter is probably the stock one.. well maybe i should change that. i am going to get new plugs and new wiring also just incase does anyone know if there is a kit to change all the vaccume line?

 

not for the low boost but preformance in general

 

i know its not the belt because it was slipping and i got a new one