14B swap now less boost

[jdillard6895]

So before i swapped out my turbo my boost gauge would hit about 14-15psi and after swapping to the 14b it shows im only hitting about 9-10psi. Before I did the swap i also had a boost leak due to a broken stud from the exhaust manifold to the turbo so it feels much better now that its been fixed but I'm curious as to why boost dropped about 5 psi just by swapping turbos. I don't currently have an adjustable boost controller, but i have one on order that should be here by Thursday but before i just simply up the boost would like to know if there are any issues that should be addressed.

 

[WRXkiller92]

the waste gate pressure on a 14b is lower than a t25 I believe, so if you don't have a MBC your the turbo is running on just watergate pressure which is be around 10psi.
at least that's what happened to me

 

[undefined0000]

Different PSI setting of the wastegate spring. Are you using the boost solenoid controller thing or no?

 

[kasumax]

The 14b is set lower because of the actuator that is attached to it. As soon as you put on a boost controller follow the instructions to adjust the boost. After a few twist hold on to the steering will at 3k rpm then again at 5k.

Your welcome

P.S. It has been advised on multiple threads here to upgrade your fuel pump when upgrading to the 14b. Atleast 190 or 255 fuel pump.

 

[undefined0000]

That's assuming he's using a wideband to monitor his AFRs while upping the boost . Mind telling us what MBC you got? Please don't say the ebay one. I made the mistake of ordering it and I knew something was funny when the knob was labeled backwards. Apparently from multiple sources you have 3 settings with that MBC.

Turtle
Rabbit
Dead Turbo

Assuming you have a wide band and stock fuel mappings, you can up the boost x amount while trying to maintain 11 AFRs. You might see 9-10 as it sits now thanks to SM:

 

[jdillard6895]

Thanks for the info, I got the Hallman Pro from Punishment Racing. I will only be upping the boost to about 14psi until I can order the AEM UEGO here in a couple weeks.

 

[undefined0000]

Just make sure you are boost-leakless and your fuel system is in check.

 

[Speedemon636]

I'm running a 14b on my 6-bolt engine in my 2G. Hitting 14-15psi at WOT. Stock actuator on the turbo (still using OEM solenoid in the bay) - no boost controller either. Also have open dump. Stock fuel system too.

 

[Jesse2012]

I'm running a 14b on my 6-bolt engine in my 2G. Hitting 14-15psi at WOT. Stock actuator on the turbo (still using OEM solenoid in the bay) - no boost controller either. Also have open dump. Stock fuel system too.

From what it sounds like, he's running wastegate pressure, that's why it's lower than yours if you have it hooked to the bcs which is 15 pounds (with the restrictor removed)

 

[Speedemon636]

So in other words, he's running it with no control over pressure at all? No bcs or mbc.. Just using the boost pressure to open the actuator.

 

[Riceburning101]

Honestly its probably a good thing he is only running spring pressure for the time being until he can figure out his a/f ratios. he should be fine no matter what but for the sake of burning pistons up and creating more problems then its worth stay with the spring pressure