battle cattle

ok ok ok I have been boosting to 1.38bar... yea bad... sooo I have been pedaling it to .5 a much safer boost range! Here is the problem I bought the car used and had a wastegate installed... this one



with a red spring inside. Now with a bit of google I have found out, I think its a HKS Standard wastegate but can't find any info on the spring color.... Just that they can go from 6psi to 20psi.... anyone have any more info about this??? Thanks

-Josh

87 t-66

iTrader: (133)

the hks units are stamped with 'hks' on top of them, if this one doesnt have it, then its more than likely a cheap ebay knock off

battle cattle

yea no part # or any info..... any idea about the spring? and boost level? The reason I ask is because the turbo hot side is... well not attached... so I have to weld it on tomorrow and wondering if I need another spring while its out. to get into the 10-12psi range.....

here is the link to what my turbo looks like...
CLICK HERE

RETed

Wastegate is too small.


-Ted

F1blueRx7

iTrader: (5)

Looks like the ebay HKS copy, theres one sitting in my garage right now (not attached to anything)

battle cattle

Well I might consider that if I had boost creep but I don't. It just doesn't open till 1.38 bar.

87 t-66

iTrader: (133)

get a boost controller

87 t-66

iTrader: (133)

heres a pic of the top of a genuine hks wastegate...

NJGreenBudd

iTrader: (1)

will a boost controller open the wastegate at a lower psi than what the spring is rated for?? I thought boost controllers could only raise the level of boost being produced by delaying the opening of the wastegate spring? I would think it's a shitty wastegate, possibly too small or just cheaply made. Am I incorrect, I'm pretty new to the turbo scene...

turboefini88

iTrader: (1)

No a boost controller will not do that. The spring thats in the WG is what it will open at. The Boost controller bleeds of positive manifold pressure to the WG to allow more actual boost to be created. The WG will still open at what the spring is rated for but your actually creating more boost.

battle cattle

yea disreguard the get a boost controller comment since they have NO idea what they are talking about. A wastegate limits the LOWEST boost level possible. Then a boost controller creates a controlled leak so the turbine makes say 15lbs but the controller leaks 5lbs and your wastegate opens at 10. I bought 9.5 spring.... so hopefully that should fix the problem sucks nobody stocks springs in my area.

NJGreenBudd

iTrader: (1)

ok thats what i was thinking. The wastegate opening is regulated by the spring pressure rate, however a boost controller can increase boost seen by motor by delaying the opening of said spring. So to lower boost you would need either a bigger external wastegate or to port your internal wastegate? Say if the wastegate was ported to 30mm and i ran the stock spring, boost pressure would only rise to 7lbs or so and then wastegate would open and allow excess exhaust gases to bypass and bot lead to boost creep....unless an electronic boost controller is installed and set to another boost level. Sorry for threadjack, but we're on topic, thanks again.

maybe the spring you had was rated for too much boost.....

battle cattle

yea pretty sure it is a 20lb spring... it really is a simple system to regulate the boost. People just get confused and start giving out wrong info.

NJGreenBudd

iTrader: (1)

well yeah your saying you were running 1.38 bar right, and isn't 1bar around 14lbs , so that would make sense if it were a ~20lb spring........