S14SR20DET Boost creep issue

[Griiix]

Hello,

Just want some feedback from members who are knowledgeable in this field.
I recently completed my s14sr swap into my s14 chassis.

After driving around for about 500KM i decided to give her a rip on the HWY.

Boost gauge reads .45 bar regularly. However, when I was in 4th gear 5k RPM - redline, the boost creeped to 1.1-1.15 bar. I quickly stopped and coasted my way home.

My current swap consist of the common stuff.
ISIS 3" Turbo elbow
Megan 3" down pipe
Tomei 3" test pipe
HKS 3" exhaust

What's my easiest solution atm aside from going aftermarket exhaust manifold and ext WG?
I know that's probably the best option, also the most expensive option.

I would like to have the car set up to safely run on a track day etc.

Options that was pointed out was:

OEM downpipe..
change exhaust to more of a restricted one
E-boost controller
port oem WG
HKS int WG

please chime in! :D

[Tyler_240]

where are you getting your WG signal?

I reference a boost only source near the intake manifold. So it will account for the pressure drop across the intercooler and represents the actual boost going into your motor. How accurate is your gauge? IIRC stock SRs w/ a boost solenoid is 11psi or just a lil less than 1 bar

[Griiix]

Hey tyler,
Im currently using a defi boost gauge
T'd off from the fpr as defi suggested. In terms of the wg signal, i followed the FSM diagram woth all the vaccum lines.

[derass]

In terms of the wg signal, i followed the FSM diagram woth all the vaccum lines.

What does that mean? The WG signal comes off the cold-pipe from the factory. It sees boost pressure only, no vacuum.

You can test the WG actuator by putting compressed air to it. Might be a punctured diaphragm. If it was connected to vacuum that might have done it.

[Griiix]

Ohh i have a blitz fmic
The signal is on the hot side

[wurley]

start by pulling the actuator off and test it, its just two bolts and a c clip, dont loose the c clip, look up how to test internal wastegate actuator. Also check the vacuum line to the actuator.

fyi: stock manifolds can be modified to run external wg's. look up "codyace manifold"

[Griiix]

Thanks so much for the helpful tips guys!

[Karlhammer]

It's pretty common on internally gated turbos being that the wastewater hole it self is pretty small. Happens a lot on log manifold Hondas too. For the waste gate pressure source, there's a number of places you could take it from reply if you wanted. Compressor housing(generally the lowest boost source.) charge pipe, or the intake manifold will usually be the highest. It just has to be consistent and the system has to be leak free. Fuel pressure regulator should be at the manifold because it need to be under vacuum/ pressure.