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Waste Gate Springs And Boost Build Issues

Simon-S14

By Simon-S14,
in Engines & Forced Induction

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Simon-S14 Grand Master

Simon-S14

Posted
Posted

got my set up dynoed yesterday and had a few issues... mainly the good old missfires and then the gate decided to stay stuck open, pulled it apart and cleaned it out and was ok after that.

however its painfully slow to build boost and the boost graph looks like a gradual slope instead of ramping up and staying there. Im running a bleed valve on there atm and im led to believe that an EBC should be the way to go.

however we tested the spring from the HKS gate and its only a 0.6 bar item... not quite the 1 bar one i thought it was. So its quite soft and i dont think that a ebc will cope with running over double the rated spring pressure.

if i got a 1 bar spring, will it ramp up harder? considering the spring is slowly opening now as it builds boost i reckon it will.

target boost is around 1.1 - 1.2 bar

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted (edited)

take the vac line off the gate and see when it hits the boost you want, back off as soon as it does tho. if the boost graphs looks good like that then you need a better boost controller, if its still no good then try a firmer spring. i find the profec b good for this stuff, as you can set exactly what boost it allows the gate to see any boost at all, meaning you can keep 0 pressure at the gate all the way up to 1bar if you want.

with good boost control you shouldnt have any trouble running double the rated spring pressure, its far from ideal but it works. i'm holding 22psi perfectly with a 12psi actuator and a profec b

Edited by JonnoHR31
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

If you put a 1bar spring in there, it will ramp up much harder.

With a 0.6 Bar spring you are more than likely getting gate creep.

I ran 24psi, external gate with a 16psi spring and bleed valve for the other 8psi - worked fine.

However when i was running 14psi using a 7psi spring, i would get massive gate creep even though i was bleeding less.

So without question, you will benefit from a heavier spring. Less work any boost control/valve has to do, the better.

If you want to run 1bar, stick a 1bar spring in there :worship:

Parag0n Mentor

Parag0n

Posted
Posted
next question is where do i get a spring from to suit a HKS gate? cant find any on the usual import sites.

Sell it, very old outdated technology and you can find better 48mm / 50mm external wastegates locally.

The new Turbosmart 50mm is the goods, or the GFB.

If you want something cheaper get a Tial.

l0WRB Mentor

l0WRB

Posted
Posted

haha out dated lol.

yeh im in same dilemma turbo comes on slower then expected im running 1bar spring running 1.4bar boost

seems 2 build slow.. im running no boost controller though im just tightening the allen key screw on top of wastegate to hold it closed longer

any idea if the length of the vacum line can cause the slower boost building?

GTR 94 Mentor

GTR 94

Posted
Posted
next question is where do i get a spring from to suit a HKS gate? cant find any on the usual import sites.

try get your spring from these guys http://www.redlineperformance.co.nz/?action=fitting they are in NZ. Daryl young is the guy to speak to. he helped me out with some springs for an old HKS 60mm gate. just get the part number from the HKS website (US or Jap) and give it to him, should be able to help you out

and yes good explanation, "its just a spring and diaphragm" ......... out dated haha???

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

like i said, go for a drive with the vac line removed. no point buying a heavier spring then having to get an ebc aswell when it doesnt solve your problem. yes it probably will, but test before you buy

tridentt150v Grand Master

tridentt150v

Posted
Posted

HKS springs are colour coded, you will want a yellow one for 16psi, you've probably got a pale blue or white one now???

I'm with you guys, don't see how a WG can be outdated, they are a simple thing and most are all generally pretty much exactly the same except for the bling bling [blue anodising/chrome etc etc]. Spring, diaphragm, and poppet valve!!

Plus if you use SK's formula for WG size, most are too big for my and other gtst applications. I'm doing over 280rwkw and according to SK formula needed a 40mm ie HKS is 40mm. Not saying others don't work, and you can have your 38, 48 or 60mm or whatever, but for optimum efficiency etc its supposed to be 40mm.

hypergear Grand Master

hypergear

Posted
Posted

I actually got some 1 bar and 1.8 springs made to suit HKS 50mm gates. If you want PM me your wastegate spring Dia. I might be able to help you out with a lot cheaper solution.

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