I hate my Tial 38mm!!!!

[V8slayr]

I have tried errverything w/ this wastegate and still it creep. I have my pressure source on the hotpipe ran to the side port on the gate w/ the top port open. I have tried switching the pressure source to the nipple on the throttle body, even worse. I have literally ran out of ideas. It has a 1 bar spring and it opens at about 15 psi and by 6k it's at 17 or better. This is a new motor so i haven't even done any full RPM pulls yet because i can't get control of my Boost.

My last idea is to swap springs w/ a friends or swap the entire wastegate itself.

Has anybody has this problem w/ their 1 bar spring and does anyone have any other suggestions?

[Chaluska]

What kind of dump tube are you running?

if it has any kind of angles that can cause backpressure (IE : A 90 degree bend) You can get some crazy boost levels

[eidk]

What manifold are you running?

[V8slayr]

I'm running a t3/t4 50 trim w/ a Peakboost manifold

[DrifterProdigy85]

Its the manifold. The wastegate port comes out at more of a 90* angle which doesnt allow enough exhaust through the wastegate to control the boost levels. I have a hybridynamics manifold with a Tial 44mm and it does the same thing. Has a 14psi spring but creeps to 18psi.

[V8slayr]

So my only option is to get a 10-12 psi spring to run 1 bar? I dunno. And will a good boost controller get control of the boost if the wastegate can't. I'm currently using a Profec B spec 2

[DrifterProdigy85]

The B Spec II could be the problem too. They cant control boost to save there life. Get an AVCR or HKS. And the wastegate thing doesnt have anything to do with the spring. The spring is controlled by the pressure from the engine. Hence needing a vacuum line hooked to it. The turbo will keep building boost pressure because the exhaust is flowing past the wastegate into the turbo. Only way to fix this is by adding a second wastegate.

[DrifterProdigy85]

Disconnect your Boost Controller and see how much creep you still have.

[srdub-t]

i doubt its the manifold, i had a peakboost mani and a tial 38mm with a gt3071r and i never had any boost issues

[V8slayr]

boost controller disconnected it does the exact same thing

[DrifterProdigy85]

Its the positioning of the wastegate. Peakboost puts it at a 90* off the collector and makes a turn going down to where the wastegate bolts on. Exhaust is bypassing the wastegate port causing the boost creep.

[V8slayr]

I'm really not buying that the 38 mm gate is too small. I have heard of too many cases of people running the same/similar turbo and 20 psi and had no issues. Let me ask this though. Under normal circumstances, do external wastegates begin to open 1-2 psi before spring pressure and then settle at the rated boost pressure, or are they supposed to stay completely closed until the rated spring pressure and then slam open and hold steady??? Because the way mine does it opens at 15 psi and climbs to 17 and holds steady up to the redline. Mine is supposed to have a 1 bar spring but they may have accidentally installed a 1.2 bar spring that is like 17.x psi.

[DrifterProdigy85]

The wastegate is big enough, its where the wastegate port is welded on the collector. Its welded on a 90* to the collector and then makes another 90* bend down to the wastegate. The flow of exhaust is bypassing the wastegate port and its going into the turbo. Just look at the picture below. As exhaust comes out of the engine it flows through the runners and up through the collector to the turbo and wastegate. If the exhaust is flowing up to the turbo, hows it gonna make an easy exit out of a 90* elbow facing the opposite direction? I have a 44mm on mine and it does the same thing. Its a design flaw that must be dealt with due to the limited room in the engine bay.

[pauliedrft]

So i just spent 800 bucks on a flawed design isn't name brand stuff grand . So since i have a avcr will this boost creep be able to be delt with or is there another way i need to fix this ???????

[ZOMG.SR20]

So i just spent 800 bucks on a flawed design isn't name brand stuff grand . So since i have a avcr will this boost creep be able to be delt with or is there another way i need to fix this ???????

should of bought a megan a least that would hold boost =P

[V8slayr]

Yeah, it sucks to spend alot of money and have issues. I'm changing to an 8psi spring today anyway, maybe it will hold at 10 and i can control it w/ my EBC. That's better that having my lowest boost being 17psi.

[pauliedrft]

should of bought a megan a least that would hold boost =P

Man your nuts i should have just had my own built and sold them on ebay for 89.99 No jk peak boost is a good brand but everything has its issues .

[DrifterProdigy85]

AVCR will still do it. Thats the boost controller i run. Like i said, if you add a 2nd wastegate as the manifold builds pressure, it will be another exit for the exhaust to escape the turbo. Or try repositioning the current wastegate for better flow.

[V8slayr]

yeah, i just need to save for a good boost controller. I think my Profec B spec 2 s*** on me anyway. Also, I changed the spring out today to a 8 psi spring and as far as the creeping issue goes it got worse. It will hold 8 psi up to around 6k and then shoots to about 12 by redline. gonna try a friend's MBC tomorrow and see what happens.

[DrifterProdigy85]

Its starting to sound like the boost controller now. If it actual boost creep, boost would rise steady through the rpms.

[V8slayr]

Nah, that issue i just described was with the boost controller out of the equation. Just pressure source straight to side port. Trust me, it is creeping without the boost controller.

[V8slayr]

My Profec magically started working today. It's still iffy tho. I did notice however w/ the EBC set at 0, it would hold 8 psi up to 6800 and then shoot up to 12 by 7300 or so. Based on what has been discussed it def. seems like the mani. itself has something to do w/ it, but MAYBE a 44 mm gate would help, but according to drifter he has the same issue. This Peakboost manifold definitely flows like hell up top and maybe my 38 just can't keep up. Oh well, I'm really gonna try to dial the Profec tomorrow on the highway and see what happens

[DrifterProdigy85]

A 44mm might help. Being your turbo is smaller than mine, it will build pressure quicker in the manifold which will get the exhaust out the wastegate quicker.

[codyace]

Do you ahve a Profec Type S, a Profec b Spec I or a B Spec II?

All are very differnet in terms of boost control!

Spec II's should follow the guide on Evo forums (evolutionm.com) for proper installation and setup

FWIW: My Tial 38 on the stock manifold works like a champ!

[V8slayr]

It's a Profec B spec 2. And it was working but I would turn it up to 100% and it would only go up to 12 PSI, I'll check the evo forums to see how those guys are setting theirs up tho. My good friend works at Titan Motorsports and he may be able to lend me a Tial 44mm to try also, so I hope that works out

[V8slayr]

Drifter, if you are using an AVC-R the solenoid is similar to my Spec 2 i think. When i had it hooked up and it would barely raise the boost I had the NC port hooked up to a tee from my hotpipe to side of wastegate and the COM port to the top of the gate. But am i supposed to Plug the NO port or leave it open. I have seen so many conflicting answers on every different kind of forum it is starting to confuse me. If your AVCR solenoid has the same port tell me how you have yours setup. Thanks.

[DrifterProdigy85]

Go on greddy's website and download the instruction manual. Its been 2 years since i hook mine up so i honestly cant remember. Im thinking the port stays open though.

[DrifterProdigy85]

Heres the manual.

http://greddy.com/img/PHP/products/pdf/682.pdf

[V8slayr]

I have the manual, but in the instructions for internal gate it says to remove all plugs from solenoid in step 1. But for an external gate it doesn't say anything about it. So i'm trying to find out how other guys are setting up the ports on the solenoid

[DrifterProdigy85]

Leave the plastic cap in on the port thats not used.