Outer Limits 4x4 Board

When I was in Aus last year, I noticed a few Staun tyre defaltors in the cabs of a couple of trucks at XRCC. (connected to a pipe)

Never thought much of it until now.

Were they being used as a bleed off valve, to up turbo boost ?

I'm looking to up my turbo boost from 14psi to about 18-20 and I'm wondering if one of my spare stauns would work like a bleed valve.

I've got a boost gauge so I can see ehat I'm changing.

Andy This would seem very feasable as the deflator will bleed any air above the set pressure, this is the typical mod on Ford Escort RS turbos it acted to fool the wastgate into seeing less pressure than was in fact present.
I have seen threads the web on fitting a larger Turbo but the problems are the same as below.

I guess they fit them in the cab to give quick access to make adjustments
and away from any water.

Downside 1bar is the recommended max for the 300TDI above this you run the risk of headgasket failure, which isn't that uncommon at standard boost levels.

Have you fitted a larger intercooler yet?
I would recommend this route for your search of extra power rather than risk headgaskets.

Unless you fancy O ringing the block/head to allow the higher boost settings that is.

tony cordell wrote:
Downside 1bar is the recommended max for the 300TDI above this you run the risk of headgasket failure, which isn't that uncommon at standard boost levels.

Have you fitted a larger intercooler yet?
I would recommend this route for your search of extra power rather than risk headgaskets.

Unless you fancy O ringing the block/head to allow the higher boost settings that is.

The head gasket knew the risk when it took the job on

I may well o-ring the head if the gaskets give up too often, but the odd blown gasket won't be the end of the world.

I'm not going to go big intercooler, I'm not convinced of their merit at slow speed, 'cause of airflow etc.

What I'm looking for is short bursts of a lot of power and torque for hill-climbs. "Drive-it".

Didn't someone rig up an aircon intercooler? I thought I read that someone was "freezing" the intercooler before starting the stage then tun off the a/c compressor and use the stored "cold" to cool the intake charge during the short duration of the stage. Or something like that...

Could you rig a boost pressure switch to the a/c compressor - off boost let the a/c cool the intercooler, then have it cut out when manifold pressure goes positive?

Scott

Red Ibex wrote:When I was in Aus last year, I noticed a few Staun tyre defaltors in the cabs of a couple of trucks at XRCC. (connected to a pipe)

Never thought much of it until now.

Were they being used as a bleed off valve, to up turbo boost ?

I'm looking to up my turbo boost from 14psi to about 18-20 and I'm wondering if one of my spare stauns would work like a bleed valve.

I've got a boost gauge so I can see ehat I'm changing.

I really dont think that the Staun would let enough air out to be effective as a boost control/waste gate .. you need something that can dump hundreds of cfm of air .. (a 3.0 litre motor can suck how many cubic feet per minute of air ?? 300 or more easily at high rpm) I fail to see how a hole 1 or 2 mm across an effetively dump enough pressure.

i think you might find that the staun's were fitted to bleed off excess pressure from the compressed air system that runs the traction control that some of the guys run

love_mud wrote:

Red Ibex wrote:When I was in Aus last year, I noticed a few Staun tyre defaltors in the cabs of a couple of trucks at XRCC. (connected to a pipe)

Never thought much of it until now.

Were they being used as a bleed off valve, to up turbo boost ?

I'm looking to up my turbo boost from 14psi to about 18-20 and I'm wondering if one of my spare stauns would work like a bleed valve.

I've got a boost gauge so I can see ehat I'm changing.

I really dont think that the Staun would let enough air out to be effective as a boost control/waste gate .. you need something that can dump hundreds of cfm of air .. (a 3.0 litre motor can suck how many cubic feet per minute of air ?? 300 or more easily at high rpm) I fail to see how a hole 1 or 2 mm across an effetively dump enough pressure.

You don't need to bleed much air off from the waste gate line. The idea is to get a brass T and solder one end shut; then drill say a 2mm hole through the solder to restrict the air flow going down to the waste gate. Then you bleed the air off from the extra outlet you've gained with the T.

You really need something that filters the air as well- don't forget you'll get air sucked into this opening when not on boost. The proper bleed offs aren't that dear to buy, and you could rig it up to a solenoid and only have the extra boost when a switch is flicked in the cabin if you so desired. I had one of my cars set up like that.

GO TO A FISH SHOP AND BY A FILTER VALVE!!!

$2

BeZeRK wrote:GO TO A FISH SHOP AND BY A FILTER VALVE!!!

$2

can I get $2 chips and a battered sav with that???

hahahha, meant an aquarium.

Andy I found this and thought of you.....
http://www.turbosmart.com.au/boost_control_valves_gated.htm

Red Ibex wrote:When I was in Aus last year, I noticed a few Staun tyre defaltors in the cabs of a couple of trucks at XRCC. (connected to a pipe)

Never thought much of it until now.

Were they being used as a bleed off valve, to up turbo boost ?

I'm looking to up my turbo boost from 14psi to about 18-20 and I'm wondering if one of my spare stauns would work like a bleed valve.

I've got a boost gauge so I can see ehat I'm changing.

The set up you saw was in Adrians Red Hilux and it is used in conjunction with the Traction control unit not for bleading boost from a turbo.


What ever happened to all the pictures and video footage you shot at XRCC. We never heard from you again after you left. Did we do something to offend you?

antt wrote:i think you might find that the staun's were fitted to bleed off excess pressure from the compressed air system that runs the traction control that some of the guys run

jeeze i'm good