5cooby1

iTrader: (18)

Recently fitted a defi boost gauge and when putting foot down the boost gauge gets to +0.5 and won't go higher is that correct.

And idle is below the 0 at 0.6.

Car is a uk classic with a vf35.

Thanks

Beastie

iTrader: (2)

You dont mention year of model which i think is important as boost varies over miodel year, and also we dont know where you have attached the boost gauge.

However, maximum boost isnt going to be achieved unless the engine is under load. If you have measured 0.5 bar under load then it seems too low. I would be expecting 1.0 bar in a classic or 1.2 in a PPP classic. Take the car to a place where the engine will run on full load, up an incline is good as you will see full boost if you floor it in top gear with the car gaining speed and wait for the boost to rise. If boost remains at 0.5 bar then common fault would be wastegate actuator not working or car in limp home mode. We take it you have no Engine Management light showing and speedometer is working.

In relation to minus 0.6 bar on idle, yes this is normal due to vacuum in manifold.

5cooby1

iTrader: (18)

Hi thanks for your reply the car is a my00 and I've tried it under full load up a hill and it hits 0.5 and stops.

The car still feels to pull so wouldn't think it's in limp mode and speedo works.

How would I check waste gate when I put my foot down and release I hear a small dv type noise is that related.

Thanks

domino46

Have you changed any pipe work to the boost selonoid as it could be the restritor pill is missing ?

Beastie

iTrader: (2)

Ok then you should be getting just under 1 bar boost once the engine is on load if it was standard turbo. VF35 flows more air and is non standard so not sure what boost setting you should have it depends on set up but 0.5 bar still seems low.

I assume if you have a MY 2000 that you connected the boost gauge to the spare nipple on the inlet manifold.

Its possible that someone has fiddled with the boost control. Even with the pill out you should see full boost. You are around 3000 to 3500 revs up this hill right? (Full boost area)

Another possibility is that your boost gauge is not reading right. Can you check using another gauge? Is it connected to the correct port on the defi controller (if you have one). Did you tee in when you fitted your gauge, can you show us where by posting a picture?

Can you look at the boost pipework and see if any modifications or disconnection? It was common in 2000 to fit a Dawes device which allowed boost to be tweaked up. This is basically a needle valve, look for a small brass valve and report if fitted.

Check the pipe to the wastegate actuator to see if that has somehow become disconnected, although that should give you maximum boost . I say that because 0.5 bar is boost pressure normally achieved when the wastegate is not working. Check the wastegate moves by moving the arm, it could be seized open which normally results in boost of 7.5psi or about 0.5 bar.

Dump valve noise sounds normal, Is it standard recirc type or aftermarket?

5cooby1

iTrader: (18)

Hi beastie thanks again.

I have looked I have a three port boost solenoid all seem ok no splits etc. my defi vacuum hose is from spare nipple to the receiver located near the strut top.

Will get a vacuum gauge to test the turbo actuator and the defi does have a controller and is in the correct slot.

Yes tried it up a hill in all ranges of rpm still hits +0.5 and stops.

Will try load some pics

Thanks again

5cooby1

iTrader: (18)

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Beastie

iTrader: (2)

That all looks ok. I suspect wastegate is problem.

5cooby1

iTrader: (18)

Will let you know the outcome of the test on the actuator.

Really appreciate your help mate cheers

5cooby1

iTrader: (18)

Ok removed the actuator and the part on the turbo opened and closed the actuators arm was very stiff but with wd40 and moving in and out it will move but only outwards(makes rod longer) is that right and it's not pulling on vacuum.

Just when it's having air forced into it.

Also with car running the pipe to the actuator has no vacuum or pressure.

So what do you think it is.

Thanks

jason_2013

If the wastegate was not opening you would get full boost and then fuel cut. So I would be looking at the 3 port boost solenoid to check that it is plumbed correctly and is working correctly. At the moment I would say the 3 port is staying closed loop so that the wastegate actuator is directly working the wastegate.

jason_2013

What I mean is you know the wastegate and actuator are working as you are getting a regulated boost. What's not working is the boost control which bleeds air out of the circuit between actuator and wastegate until the desired boost is reached.

Either that or you've got a leak in the boost pipes or intercooler somewhere.

5cooby1

iTrader: (18)

Ok I will check where each one goes to from the 3 port solinoid which is under a year old so hopefullly not that.

Also today I sprayed all hoses with brake cleaner to see and leaks which I couldn't See any but will look more into it.

Would different headers cause this?

Thanks

jason_2013

No different headers won't cause this. Is it running the standard ecu?

5cooby1

iTrader: (18)

Was remapped last year but didn't have a gauge at the time.

jason_2013

was it ecutek or aftermarket ecu. If after market did it have 2 maps and maybe you're on low boost map and the switch or wiring is the problem?

5cooby1

iTrader: (18)

Hi mate yes it was ecutek.

Will try and find a diagram of how it should be plumbed in

Beastie

iTrader: (2)

I dont think we do know that. If the wastegate flap was jammed open or fallen off he would only get 0.5 bar of boost.

I would suggest disconnecting the boost pipe to the actuator and then seeing in one extremely brief test if boost rises over 0.5 bar. If it does then its not the actuator. Its the boost control system or map.

Alternately as i said previously could it be the gauge?

5cooby1

iTrader: (18)

Has anyone got a layout of how the hoses should be plumed in

5cooby1

iTrader: (18)

Ok just took the pipe from actuator and it went well above 0.5

piehole1983

iTrader: (7)

Boost control solenoid I'd say in that case.

5cooby1

iTrader: (18)

Hi is that the 3 port one?

Thanks

piehole1983

iTrader: (7)

Yeah, some are 3 and some are 2. Mine is 2. It's the only thing that allows the boost to rise. Do you have an aftermarket boost controller fitted or is it still the factory solenoid?

5cooby1

iTrader: (18)

Mines a 3 port one from a guy on here. Pierburg

Should I have battery voltage to the boost soleinoid terminal as will check this before.

piehole1983

iTrader: (7)

I don't know about the voltage at the valve. I imagine it'll get a pulsed voltage from the ECU to regulate the opening amount rather than a straight 12V.

I read that this only happened after you fitted a boost gauge? Where did you connect the gauge to?

5cooby1

iTrader: (18)

Hi I only noticed when it had the gauge fitted as didn't know it was so low on boost. so its been like it a while I remember it pulling quick when it was mapped but until I removed the hose tonight I forgot what it should actually go like.

piehole1983

iTrader: (7)

Ah right, makes more sense. Definitely try a working solenoid on the car to at least rule it out. I think that's what the cause is going to be!

What ECU is in the car?

5cooby1

iTrader: (18)

I don't know which ecu it is off the top of my head will try and find out.

Thanks

5cooby1

iTrader: (18)

FIXED it was a 3 port soleinoid at fault replaced it and all is good boosts to just under 1.5 bar and make me smile its like having a new car.

Anyone need a 3 port contact drewtts on here top bloke and many thanks to him it's sorted and a big thanks to the above people who helped.

Thanks

https://www.scoobynet.com/member.php?u=103389 to drewtts

piehole1983

iTrader: (7)

Yay I was right lol!