18g install problems

[2g4G63]

I just installed the greddy 18g on my 98 GST and it pulls harder than the T-25 but i dont think its pulling as hard as it should be. I was expecting a lot more out of it. I didnt port the O2 housing, just the wastegate. Im running the same 15 psi as i did on the T-25, and using the same actuator. Have a CEL for TPS and O2. There is no shaft play on the turbo, everying is fine mechanically with it. There are no boost leaks. I dont know why its not pulling as hard as it should be, please help. my mods are:

Apexi GT downpipe with N1 exhaust
FMIC with upper piping
Type S BOV
hacked 3" injen intake
SAFC
Walbro fuel pump

If anyone has any ideas why its not pulling like it should please post! thanks in advance.

 

[blcknspo0ln]

I'd imagine because the turbo hasn't "woken up" yet. if there is nothing else wrong with the car, I'd bet that when you boost up higher, it will definitely feel a lot better.

 

[2g4G63]

shouldnt even 10psi on a 18g pull much harder than 15psi on the T-25?

 

[blcknspo0ln]

ever driven a 16G car at 10 psi? it sucks

 

[oldman]

shouldnt even 10psi on a 18g pull much harder than 15psi on the T-25?

Pressure is measured at the intake manifold so 10 psi is the same for both turbos. The advantage of the 18G will become more apparent at higher psi and rpm where you're reaching the limits of the T25. The 18G will also allow you to run 20+psi when you're ready. If you only plan to run 10 psi, you'll be better off with the T25 because of quicker spool.