Outer Limits 4x4 Board

Just out of interest, has anyone disconnected their turbo's waste gate actuator line to see how much boost their turbo will produce?

Obviously, this is not a recommended practice for an extended trial time.

I know someone who did it with a pulsar ET turbo. They went for a short drive at night and the exhaust side turbo housing was cherry red when they got back.

Some big us diesels run 30-40psi of boost from the factory.

my tiny motor would go BANG for sure its pushing its self on 14psi altho i dont think the standard GQ2.8 turbo will go much more

I have an aftermarket turbo on my HJ60. I was curious about how the turbo was set up. I run it usually at 9psi, runs fine, not hot at all, but it doesn't get to 9psi before 2200rpm.

I was hoping to get it up to boost a little lower than that to get a better low down torque curve.

On the plus side, I just disconnected the waste gate, and the turbo hit 15psi fast at 2700rpm. I would hate to think what it would be doing if I hit 3500rpm when the old 2h runs out of puff. I dont want to find out. My boost gauge only goes to 15psi, so thats as game as I was.

ISUZUROVER wrote:I know someone who did it with a pulsar ET turbo. They went for a short drive at night and the exhaust side turbo housing was cherry red when they got back.

Some big us diesels run 30-40psi of boost from the factory.

All Audi A4 1.8T's light up their turbo bigtime after only a short drive but strapping it pretty hard... At night it looks very impressive but it's no wonder they $hit turbo's all the time

carts wrote:Obviously, this is not a recommended practice for an extended trial time.

When are you doing this Carts? Make sure you video it for us "out of towners" ... I don't want to miss the excitement

i run mine for ages, about 3-4 months. It held together pretty well with 17+ psi. If the air was cold it would peak out about 21. All thanks to Ruff performance at logan.



NICK

my surf runs 10psi standard

crokie83 wrote:my surf runs 10psi standard

My cats name is mittens.

TuffRR wrote:

crokie83 wrote:my surf runs 10psi standard

My cats name is mittens.

depend if it's petrol or diesel. cant run a diesel lean so it doesnt matter. its only gonna go as good as the injection pump can flow. on a 1hz with a turbo from dts thru a big cooler a mate of mine runs up to 23psi and it doesnt phase it. goes the same at 23 as it does at about 15 because the inj pump cant pump anymore diesel. he's been running this for prob about 60k. went up cape and kimberly and didnt have any dramas at all pushing high boost all day.

go on plug up the line
fun to watch boost guage wrap around

mule75 wrote:depend if it's petrol or diesel. cant run a diesel lean so it doesnt matter. its only gonna go as good as the injection pump can flow. on a 1hz with a turbo from dts thru a big cooler a mate of mine runs up to 23psi and it doesnt phase it. goes the same at 23 as it does at about 15 because the inj pump cant pump anymore diesel. he's been running this for prob about 60k. went up cape and kimberly and didnt have any dramas at all pushing high boost all day.

go on plug up the line
fun to watch boost guage wrap around

Actually diesels can run very lean 200:1 air fuel ratio won't hurt. Extra air help with cooling because heat is transferred to the additional air before it enters the exhaust. It also reduces smoke in the exhaust.

carts wrote:I have an aftermarket turbo on my HJ60. I was curious about how the turbo was set up. I run it usually at 9psi, runs fine, not hot at all, but it doesn't get to 9psi before 2200rpm.

I was hoping to get it up to boost a little lower than that to get a better low down torque curve.

On the plus side, I just disconnected the waste gate, and the turbo hit 15psi fast at 2700rpm. I would hate to think what it would be doing if I hit 3500rpm when the old 2h runs out of puff. I dont want to find out. My boost gauge only goes to 15psi, so thats as game as I was.

If you get more boost sooner from disconnecting your wastegate, your wastegate is 'creeping', ie bleeding off boost before it actually reaches the boost level that it should be limiting to.

You will never get any more boost lower in the rev range by defeating a properly working waste gate compared to having it operable as it is a function of the turbocharger and engine dynamics.

All you are doing by having more boost than you need in a diesel is reducing the life of your turbocharger and engine, more turbine rpm = more wear, higher compression pressures = more wear for no power gain. Push it too far and zing the impellers off and your up for an engine/turbo rebuild for the 'fun' of seeing a number on a gauge


If you want more go, get a pyro and start winding the fuel up

Cheers
Daryl

had an l20 bluebird with a T04, external wastegate, water injection. the wastegate diaphragm had a hole in it, used to run upto 23 lbs boost, went well, had a couple of rebuilds, exhaust housing and manifold used to get orange/red on a hard run at night.

I run a turbo smart ajustable boost tee some times and boost seams to take longer to rise in lower RPM and in turn make the car go slower


But I can`t see why or how the tee can make boost rise slower ?????

My cats name is mittens.

I bent my wookie.

ISUZUROVER wrote:I know someone who did it with a pulsar ET turbo. They went for a short drive at night and the exhaust side turbo housing was cherry red when they got back.

Some big us diesels run 30-40psi of boost from the factory.

he he a mate an i did it in his EXA turbo, pulled off his wasegate accuator(unlimited boost), just for a laugh to see wat would happen,
he built the motor to handel it, but skimped on pistions
ran a good 37+psi boost
it melted a 10c size chunk off the piston dome on no.3

Mate off mine has a mike vine turbo kit on his 2H diesel cruiser. Dosen't even have a wastegate runs like 22psi boost with no problems

The TD5 runs a factory 19psi with intercooler. When they get chipped etc, it seems nobody turns up the boost though. They fiddle with the fuelling bringing power from 101kw to 147kw, and then with a bigger intercooler a steetable 200kw is a goer, then comp use 250kw. No internals just CPU and intercooler.

Go on then Slunnie. I would love to see your Disco producing 200+kW.

I guess i need to get myself a nice big intercooler and a boost gauge that reads more than 15psi.

I recall talking to a few of the mechanics at a truck race meet, they were runnning those serving platter size toibo's at 90+ lb of boost ..

They are great to watch race especially in the wet .. 8 tonnes of primover going opposite lock round the chicanes with boot full to the floor and the pipes billowing

disconected mine, lifted the foot at 15psi, would have gone to 20 easy i recon, only boosting 6psi standard with a bit of black smoke, open it up to about 9 i recon and it will be sweet..
im now in the process of experimenting with differnt springs under the wastegate diaphram..

I have a 2H with an aftermarket turbo and i get about 6 psi at 1500rpm and the waste gate kicks in at 9psi which i have by 2000rpm. Sounds so cool.

rocknferoza wrote:Mate off mine has a mike vine turbo kit on his 2H diesel cruiser. Dosen't even have a wastegate runs like 22psi boost with no problems

Its been de-tuned now! I think he was worried about having to put a 6.5 in it when the old 2H finally says enough is enough!

just remember kids more boost = more heat, thet's why when people wik up the boost they add an intercooler if it doesn't alredy have one. I upped my old surf to 12 - 14 psi without an intercooler and it went better and smoked less but the seals in the turbo didn't last for long after that.

more boost alone kills things but when you combine it with a bigger exhaust, air filter and muck around with engine internals it can make even a shyte surf go like a normal car.

Chris

derangedrover wrote:If you get more boost sooner from disconnecting your wastegate, your wastegate is 'creeping', ie bleeding off boost before it actually reaches the boost level that it should be limiting to.

You will never get any more boost lower in the rev range by defeating a properly working waste gate compared to having it operable as it is a function of the turbocharger and engine dynamics.

You will get more boost even with a properly working wastegate. The wastegate just doesn't suddenly open once a preset level is reached- it will slowly open further as the boost rises. Remember all a wastegate involves normally is a pressurised diaphragm pushing against a spring to open a flapper valve on the end of a steel rod.

I had an electronic boost controller in a previous vehicle and there was a noticeable lift in boost at lower revs because the wastegate didn't creep open with it fitted.

carts wrote:Go on then Slunnie. I would love to see your Disco producing 200+kW.

I guess i need to get myself a nice big intercooler and a boost gauge that reads more than 15psi.

Me too.

roc70y wrote:just remember kids more boost = more heat, thet's why when people wik up the boost they add an intercooler if it doesn't alredy have one. I upped my old surf to 12 - 14 psi without an intercooler and it went better and smoked less but the seals in the turbo didn't last for long after that.

more boost alone kills things but when you combine it with a bigger exhaust, air filter and muck around with engine internals it can make even a shyte surf go like a normal car.

Chris

Agree with chris, mines on its second turbo after playing with fuel pump on first one, blew seals out, had to replace, didn't notice huge change in performance either.

Guys,
a good way of reducing wastegate creep and getting a nice mid range boost spike is the use of an over boost canister. All you do is get something like a std sray can and when empty drill a hole in the top where the spray part is and solder in a 1/4" hose fitting. You then run a T-piece in you wastegate line to the canister. What this means is that you have to fill the canister and presurise it before the wastegate will open. You can experiment with different size cans or place restictors in the main line to restict flow. This works very well as I have done it a couple of times and the results speak for themselves.

Cheers
Paul

or spend $50 on an in-cabin boost controller.

pyro, boost nob, boost gauge