help: car boosts, struggles mid-range then Goes

[GSTspyder17]

ok heres my problem i cant figure out..

i will go into WOT the car will boost and pull somewat then around 3800-4900 it will feel like it struggles to get up top throughout the rpm's and then around 5000rpm it just feels normal and pulls hard to redline....

fuel filter was replaced
I just put in a new set of NGK 7es plugs
Magncore wires
boost leak test and took care of everything, only leak now is from two injectors seals..
((can this really effect anything?))

This is my setup:
small 16g- 14psi
external wastegate
SMIC
2.5 downpipe
3" exhaust no cat

Someone help

 

[GSTspyder17]

anyone?

 

[Dsmj89]

I would look into fixing the injector seals first. Also check for boost leaks.

 

[GSTspyder17]

i ordered the injector seal kit from extremepsi and im getting them tomorrow.....will try that and see what happens

 

[GSXSixteenG]

Are u tuning with anything? I had the same problem when I had a bad tune with my s16g. Is your fuel pump rewired?

 

[zhjiln]

maybe try using NGK 6'es instead of your 7's..... your car isn't modified enough to require NGK 7 plugs

 

[Jst4Cyl]

Fuel mods?

 

[GSTspyder17]

no fuel mods yet....might try rewiring my fuel pump soon....

 

[GSTspyder17]

fixed the problem..........i went out and bought new 6es plugs and replaced all injector seals from extreme psi and no more breaking up or sputtering,

pulls hard all the way to redline now

 

[zhjiln]

fixed the problem..........i went out and bought new 6es plugs and replaced all injector seals from extreme psi and no more breaking up or sputtering,

pulls hard all the way to redline now

yep, mostly likely it was your ngk 7's.... 6es more for you since your basically stock..