Azcamel

iTrader: (1)

so whats your correct source? right off the turbo work for you? well that is where mine is coming from and i get huge spike/creep like no other if it vents the top.
open vent to the top is great for smaller turbo, lower hp application, but when you have a high RPM happy engine with a big turbo i notice that it needs the extra pressure to control boost.

Azcamel

iTrader: (1)

Yes, but witht he boost controller in the off position it help control the boost pressure letting the wastegate to full open at the preset spring. I have not looked at the valve while it is in operation so i cant say for sure but im guessing the boost contoller cannot control the wastegate spring and opens premature and with it is time to fully open it sorts of get stuck and starts to creep. I think the top port when route correctly help keeps the gate cloes and when the boost contoller or gatespring is reached it helps the gate fully opens.

I might be full of crap, but this is what i tried and worked for me, even with the cheap turbonetics MBC i have now.

DriftDreamzSS

iTrader: (4)

So I installed a quick tap in the coupler right after the compressor housing, and also put in a 7psi spring in the wastegate, didnt help at all. Still goes up to about 15psi if I go wot. If i go 1/2 throttle it will stay at about 10psi and 3/4 throttle about 12psi. So i dont know what else to do other than add back pressure to the exhaust.

PandazRx-7

iTrader: (18)

Have you checked the diaphram on the Tial? Maybe you have leak and the valve isn't opening all the way.

If you pressure check with a MitiVac on the side port, it is normal to have a slight leak at the valve seat.

DriftDreamzSS

iTrader: (4)

I visually looked at the diaphragm when I changed the springs and didn't see any holes and the valve slides up and down smoothly. Ill try and test the wg with a mitivac to make sure its opening all the way.

PandazRx-7

iTrader: (18)

Keep in mind that pressure only on the side port won't open the valve... the valve also needs equal pressure from the exhaust to push the valve open.

When I checked the pressure on mine I was able to pump it up to 15psi on the side port and it would semi-quickly bleed off... just make sure you can atleast keep a certain pressure by quickly pumping it with a MityVac.

classicauto

iTrader: (3)

Is the boost control solenoid still hooked up? Or does the line go straight from the quick tap to the side port of the w/g?

DriftDreamzSS

iTrader: (4)

Yes, the profec is all hooked up. I tried it with the new quick tap line going to the solenoid then to the top port and I also tried it the opposite way with that line going to the side port and a line from the uim going to the solenoid to the top port. It seemed to work slightly better with the quicktap line going to the sideport but its still unable to control boost at wot or near wot conditions. I have not tried it with only the quick tap to the side port without the profec plumbed on this new spring but I did do that on the 8.7psi spring, Ive been driving the car for the last week running on just the spring with no ebc and the only way to prevent the creep is to add back pressure with the exhaust silencer.

classicauto

iTrader: (3)

Try it out for kicks without the EBC hooked up at all. Just one line from quick tap to the side port....leave the top port vented.

DriftDreamzSS

iTrader: (4)

Ok, been awhile but I finally got a chance to work on the car some more. So last I had the setup was: the quick tap is right after the comp housing and that hose goes to sideport, 7psi spring is in the gate, still had problems. Just the other day i switched my straightpipe and 80mm Magnaflow Ti for a resonated midpipe and a rb dual tip and nothing changed with the added back pressure.

So I removed the Tial again and tested it with a bike pump pressurizing the sideport. It does crack at 7psi like it should but it doesnt fully open till about 16psi! Is this normal? Surely that is why my car is creeping, the partially open gate just wont keep boost under control. I want to be able to run 10psi on low boost but have a wastegate that wont even open all the way untill 16psi. Also this is the 2nd spring i have had, the last one was the 9psi spring so its not like I have some freak spring thats extra stiff. Is there another brand of wastegate that doesnt take so damn long to fully open?

DriftDreamzSS

iTrader: (4)

Ive been looking into the synapse wastegates, does anyone have any experience with those? Looks like it will use the same flange as the Tial and its slightly larger but what im most interested in is how fast it opens. I have seen the videos of them showing the pre load and adjustment capabilities at high boost but Im looking for fast response at low boost.

zayrx7

What model boost controller do you have, if it is the old greddy profec b; you will need to set the dip switches in the back of it.

DriftDreamzSS

iTrader: (4)

it's the profec type S but the creep happens even with the vac source just after the compressor housing to the side port on the gate without the ebc hooked up.

PandazRx-7

iTrader: (18)

Not sure if that's what should happen... when I tested mine with a MityVac the valve would'nt move unless there is equal pressure on the valve as on the diaphram... which is what Tial notes as well.

Btw, I fixed my creep issue with my 500R kit by swapping my 13psi spring (big blue) for a 10psi spring (big red). Holds steady at 10-11psi with the Profec-S off and holds rock solid at 1 bar on my low setting. I used to creep to 17psi.

Maybe you should try swapping out the wastegate and see what happens...

DriftDreamzSS

iTrader: (4)

Ya, i already switched from a 9psi spring to a 7psi and it didnt help at all. Im really thinking about buying one of those 50mm synapse's and seeing if it works any better. I see thats what rx7store sells with their kits now.

JSP john

drive the car with no wastegate on and see how much boost it makes. could just be a bad manifold design, so a larger wastegate wouldn't help. and it is normal for the wastegate to partially open at spring pressure, you should have plenty of exaust pressure to open it the rest of the way.

keister

iTrader: (20)

What ever came of this? Were you able to keep the car at 10? I have nearly the same setup, GT35R, 44mm tial mvr gate(6psi spring), 3" straight pipe to racing beat dual tip. If you solved this I'm all ears would like to stay around 10psi for street driving.

DriftDreamzSS

iTrader: (4)

Yep, I bought an HKS stainless manifold and its been great ever since. The manifold supplied in my kit was so poorly made that the opening to the wategate runners was restricted by about 50% from the overhang of very sloppy holes in the main runners.

Jason

iTrader: (5)

What manifold did you have initially? Even with the cheaper eBay style manifolds I have never seen boost creep or problems controlling boost.

DriftDreamzSS

iTrader: (4)

T pro I think it was, the problem wasnt runner placement or design, they were just choked down to about half size at the opening. It had some strange "D" shaped divided flange for the turbo that didn't match up to any turbine housing I've ever seen.

keister

iTrader: (20)

Wow interesting, I think I am using the same manifold you had previously. Guess I should inspect the wastegate runner/manifold runner intersection. So you can hold 10psi all day long now?

Jason

iTrader: (5)

Did you get one of our kits? If so when did you get it?

Thanks

DriftDreamzSS

iTrader: (4)

Yes, it did hold 10psi no problem with just swapping the manifold and leaving everything else the same. I have since switched my setup to a 1.06 turbine housing and I took out the profec and am using the power fc for boost control with my fog light switch wired to a datalogit for hi/low boost switching. With both setups and both boost control methods I had no creep with the hks manifold and the same wastegate spring.

Also on that old manifold I was able to get a long neck die grinder in there and remove enough material to get it about 75% opened up and it did help. My creep went from 15psi+ to 13psi or so but it wasn't enough for me, i decided to spend the money on the new manifold.

keister

iTrader: (20)

Nope, I pieced mine together..no specific kit

keister

iTrader: (20)

Thanks again, since I was reviving an old thread. Have a couple things to check now. Much appreciated!