having a few boost issues with my new rb26 setup

[b00stinbmx]

I have a whole new RB setup for my car this year and i just dyno'd my car with some disappointing results. hopefully everyone can take a look and maybe help me out some to figure out what is going on. first off here is a rundown of the setup so you have a idea.
stock rb26
new rings, bearings, fixed oil pump drive, n1 pump with spool gears. stock internals.
docrace t4 single gate manifold
gtx3582r turbo
tial MVR 44mm wastegate
ID1000 injectors
stock ITB and Plenum.
2.75 " core intercooler with 2.5' hot pipe and 3" cold pipe.
Haltech plug and play pro ECU MAP sensor

what my issue was was pretty much a pretty severe boost creep. Im running a 1 bar WG spring and it dosen;t seem like my manifold/WG setup can keep up. around 6500 im getting a spike to 20PSI. i was making close to 410whp around 6500 when i let off on the dyno. i wasn;t up for running any more than 1 bar of boost due to still letting the rings settle in and just not caring really to make more power at the moment. my tuner suggested a few thigns for me to try out which i will probably go with. first was a larger intercooler becasue my IAT's were pretty high for a fairly cool 65 deg day.
secondly he is suggesting i weld a second flange on the other side of my manifold collector and run twin 44mm gates. i didn't really think this would be necessary for only a GTX35r but no matter what we tried the boost creep was there. even if we tried running more boost with the use of the haltech EBC it still crept up. I boost leak tested the whole motor and found nothing. no leaking lines or anything. the wastegate is opening i know that. but i was thinking maybe not enough? anything you guys can suggest before i go the route of having to chop up this manifold would be great. I ordered another wastegate just incase so i gigured i would try the new one just for s***. the MVR is a used one that has been on previous setups for some time now. i figured after finally buying a $1,600 manifold this type of issue wouldn;t exist but i guess i was wrong. and had i known i would need to go twin gate i would have went for a real twinscroll setup

[USMCgetsome]

does your wastegate have two vacuum ports? if so where is the boost controller hose hooked up to.

[b00stinbmx]

Turbo to bottom WGport. Td off to port 1 of the solenoid. Port 2 goes to top of the WG

[RRRRB]

I had a simular problem.. mine was worse. I have an AFI divided T4 manifold with twin mvs 38's it would creep from about 15psi to 25 psi and eventually hit boost cut.. i ended cutting off the 38 flanges and welding on twin 44's helped a lot still creeps a couple lbs but I can live with that.. it seems it's kinda hard to get perfect wastegate placement in this chassis..

[gawdzilla]

It will creep. I have a docrace t4 single with a precision 46 wg. gt3582r (not GTX) .82 AR tial turbine housing. I have a 11-12 psi WG spring and at WG pressure only will creep from 14-17 psi.

The issue is there is only a pickup on one side of the manifold. It is "designed" as a twin scroll setup. I chose single wg for simplicity. Also, the smaller turbine housing (I went from 1.06 down to .82 for response) is a bottleneck when the engine is at higher rpm.


I guess the real question is what are you planning on using the car for? Will you be running it at 1bar forever or just break in? If you plan to do 20 psi in the future, then just stick with it and run more boost. Higher boost levels are controllable and will not creep. Creep isn't necessarily that bad, as long as your tune is accounting for it. Also, you have a GTX which flows more than a GT. btw - what turbine housing do you have? If you are ok with losing some response, going to a larger turbine housing will yield more power and flow better (less creep)

[julio]

Single WG setups on RB's do tend to creep. You said that your current WG is used? If so, have you taken it apart to make sure the diaphragm isn't ripped? Are the fittings tight? I understand you leak tested your engine, but no pressure will get to the WG due to the EBC/valve not being engaged unless you had it powered during the leak test.

A pic of the manifold/WG setup would help too.