Grant74

iTrader: (10)

Bit of an unusual one this- my rally car is losing boost as it gets hotter! And seems to give a little more boost on part rather than full throttle.

I tried a manual boost controller and no different, and anti lag on and off didn't impact it- launch control seemed fine too but probably a bit down.

New engine, new turbo (vf34), new wrc spec intercooler, 34mm restrictor, no bov, simtek.

A fairly unusual question so not sure will get any responses- I'm going to take turbo off to check actuator but lost after that other than map again

1509joe

iTrader: (2)

Vf34 is not a very robust turbo to be running with no BOV. I hope I'm wrong but check the blades on your compressor wheel.

ossett2k2

iTrader: (9)

Faulty BCS?
Or maybe just a map tweak needed,if your getting more boost on partial throttle then the WGDC may need adjusting on WOT.

Grant74

iTrader: (10)

Will check turbo in the week- it would hit 20 psi on the road in 4th when colder, but not when hot- bcs is new and it did it with manual one as well

JDM_Stig

iTrader: (3)

What kind of temps are you seeing ?
Could it be the ECU protecting the engine when it is seeing high temps, you havent said if the car drives spot on when it is cooler ?

Grant74

iTrader: (10)

In between stages I can get it to boost in higher gears, but not lower gears- I don't know what temps but it was 25 yesterday and on stage will be run flat out- intercooler stayed cold all day (as it should at that price )

i did wonder if its ecu as mechanically turbo should have just run with manual boost controller, and did boost when cold! I would have thought an exhaust leak would be worse when cold not hot

1509joe

iTrader: (2)

As your running Simtek I take it you have ACT sensor. Log or watch your ACT and see is it pulling timing if it isn't as per pervious post unfortunately.

Grant74

iTrader: (10)

I am running simtek- will check turbo then log I think

Grant74

iTrader: (10)

So the update is ecu is all good, and when j went for a run with actuator disconnected from vacuum lines boosts really well, so turbo etc seems fine ffs

Rob Day

iTrader: (78)

Crack in turbo maybe? Any noticeable new noise when it's not boosting as you'd expect?

Grant74

iTrader: (10)

Thanks to those that too the time to reply- short answer is pressure checked everything, got fed up, and bought a wrc core turbo, which goes on next week.

it would only boost the same with actuator disconnected so I think it's the turbo

Its been an expensive time- fuel pump and regulator went in a rally- you just need to know it's nearly impossible not to buy a Chinese fuel pump- those in the know said an aem one from demon Tweeks if that's helpful to know

AS Performance

iTrader: (4)

we carry genuine Walbro & RCM fuel pumps (as well as most other things .....)

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