boost controller APEXI

[newdsmr]

I am a new member. I just installed the new digital APEXI boost controller. I am looking for some help on how to tune it. I have a 1997 GST 5-spd. It seems that no matter what boost setting I give it, I am not able to hold 15-17psi. Any help would be appreciated.

 

[GoFastTSI]

What other mods do you have? Also, I don't have any kind words for the Apexi S-AVC. I've found it to be a terrible waste of money more eye candy than a good electronic boost controller. However, I'm straying off topic. List your mods and any recent work to your car.

Joe

 

[newdsmr]

I have 3 inch downpipe, exhaust w/straight pipe, Greddy BOV. Extreme IC pipe and Injen Intake and HKS cams.

 

[Black95GSX]

What turbo do you have?

 

[newdsmr]

I just have the stock turbo.

 

[Black95GSX]

Ummm... considering a T25 cannot supply a bone stock motor with enough air to hold boost through redline (even with an upgraded bov) how do you expect it to hold 15-17psi on a car with HKS Cams?

Even 16gs sometimes have trouble holding boost through redline on a car with a decent set of cams...... (small 16g is 505cfm... b16g is 550ish.. T25 is 250cfm)...

Your motor is flowing way more air then your turbo can handle... honestly you'll probably end up blowing your T25 if you try to hold 15psi, because it would have to spin sooo fast to make 15psi on your car, compaired to a stock motor.

You should consider a new turbocharger... i suggest checking out www.agpturbo.com <-- they have some really kick a$$ stuff out there right now..... and for some damned good prices compaired to the competition.

 

[newdsmr]

What would you say the max psi I could run saftly until I get that turbo upgrade?

 

[L2RTSiAWD]

15psi.

later,

 

[Black95GSX]

Originally posted by newdsmr
What would you say the max psi I could run saftly until I get that turbo upgrade?

Honestly, untill you upgrade the turbo, I HIGHLY suggest running straight from BOV line to turbo (no boost controller/stock boost) untill you upgrade. My reasoning behind this is that even to support 12psi on a head that flows that well, it'll be spinning faster then it normally would at 15psi..... which is what makes turbos go "boom" (meaning wheel touches the housing and bad things start happening....)

 

[newdsmr]

Thanks for all the good input. I appreciate it.