Boost Spiking Issues

[Weapon]

I am at the end of my patience with this issue so i am hoping someone on here can point me in the right direction.

Current set up is a standard RB26 with ETM manifold and GT3582R with 0.82 rear housing with the wastegate off the housing mod done. Runs a Tial 44mm wastegate with 1bar spring and full 3 to 3.5inch exhaust. Runs 100mm cooler and Vipec ecu.

We have tried a new wastegate (turbosmart 45mm) plumbed in a new vac feed with bigger vac line (3/8th) dropped the screamer off the wastegate changed it back to the original 0.7bar spring all to no joy.

Boost goes up to spring pressure then creeps 1 or 2psi then spikes to 24psi

Any help with guys that have the same wastegate set up would be fantastic

Cheers Marty

[Weapon]

http://www.skylinesaustralia.com/forums/R33-Gtr-t329733.html

Above is link to build up thread for reference. Also there is no EBC or bleed valve its just spring pressure. Wastegate was pulled apart and inspected to make sure all was well and appears to be fine

[PM-R33]

I'm not that familiar with the wastegates running straight off the housings but could it be a case that the angle (or positioning) that the wastegate comes off from the housing is to sharp? This could cause turbulance and a pressure difference in the housing and therefore the path of least resistance would be through the housing causing boost increases instead of out from the gate?

Was the gate welded onto your housing by ETM or did you and Ben just pick a spot and chuck it on?

Just thinking a bit outside the box here given that you have tried a different gate.

Edited September 26, 2010 by PM-R33

[Weapon]

Thats what i am hearing from a lot of people actually which is why i am leaning to plumbing it in like a traditional set up.

This kit and gate set up was done by ETM, no mods to his kit has been done

[Weapon]

As you can see the exhaust flow path and the direction of the wastegate intergaration pipe it doesn't really flow with the exhaust flow path