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The mkiv Supra Owners Club

can a boost controller fix it?


Guest WJX808
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Guest WJX808

Im driving an auto stock supra. (J spec) I have recenty changed my turbos to the UK spec supra as my original ones were leaking.

I have also changed my exhaust system using a 3 inch stainless steel piping. The extractor is original though.

 

When i boost the car...i get some overboosting problem. The boost went as high as 1.2 bar and it cuts off...luckily my boost cut is still functioning :)...So now i could not floor the car all the way when im into top gear (ie. above 200 kph) as the boost will definitely climb to 1.2 bar if i floored it.

 

Can installing a boost controller fix the problem? at least i could set the boost at the level i want to. And how much boost can a stock UK spec turbo takes?

 

Appreciate your help and advice guys.

 

Cheers

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Guest WJX808

but say with a boost controoler...can i fix the boost at 1 bar for example? And it will not increase even if i floor the throttle at high speeds?

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Guest WJX808

Yeah...i understand that...but can it definitely fix my boost at a certain level say 1.0 bar or 1.1 bar...so that i will not reach 1.2 bar.

 

I hate the feeling of not beien able to floor the throttle

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Yeah...i understand that...but can it definitely fix my boost at a certain level say 1.0 bar or 1.1 bar...so that i will not reach 1.2 bar.

 

I hate the feeling of not beien able to floor the throttle

 

No. If your car is hitting 1.2 bar without any form of boost controller at the moment then fitting a boost controller will not let you lower that.

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Guest WJX808
No. If your car is hitting 1.2 bar without any form of boost controller at the moment then fitting a boost controller will not let you lower that.

 

 

 

Jesus..:( then what can i do to fix this prob?

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Ok in simple terms as this thread has went round in circles.

 

Fit a FCD to raise the fuel cut to 1.2 bar as the stock ECU cuts fuel @ 1.0 bar. Get a 1bar restrictor ring this will then limit the boost (still may get boost spikes iirc) then get a boost controller to then raise the boost to 1.2bar.

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:goodpost:

 

Ok in simple terms as this thread has went round in circles.

 

Fit a FCD to raise the fuel cut to 1.2 bar as the stock ECU cuts fuel @ 1.0 bar. Get a 1bar restrictor ring this will then limit the boost (still may get boost spikes iirc) then get a boost controller to then raise the boost to 1.2bar.

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Guest WJX808
What problem? 1.2 bar is fine. If you really want to lower it then either get a restrictor ring or refit one of the cats.

 

 

The problem is now when i full throttled the car...it will reach 1.2 bar and the boost cut kicks in...hate that feeling when the boost cut kicks in...so what can i do to fix this problem? Should i change to a smaller inch exhaust piping? (im currently using 3 inch)

 

Cheers

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The problem is now when i full throttled the car...it will reach 1.2 bar and the boost cut kicks in...hate that feeling when the boost cut kicks in...so what can i do to fix this problem? Should i change to a smaller inch exhaust piping? (im currently using 3 inch)

 

Cheers

 

 

See post # 10..Nuff said.

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What I can't understand is why your UK turbos are overboosting. Even with both cats removed and a straight through exhaust, the wastegate should limit boost to around 0.9-1bar.

 

Can we just establish the following as this thread has got a bit confusing.

 

1. Do you have a Fuel Cut Defender already fitted? If so, are you saying the fuel cut level on the FCD is raised to 1.2bar?

 

2. Do you have a boost gauge fitted? I presume so if you say you are hitting 1.2bar, but just thought I better check.

 

If your UK turbos are hitting a raised 1.2bar fuel cut level, then I'd suspect that the wastegate isn't opening, which could mean one of the small vac hoses is off or leaking. Check all the hoses to see if you can see anything.

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What I can't understand is why your UK turbos are overboosting. Even with both cats removed and a straight through exhaust, the wastegate should limit boost to around 0.9-1bar.

 

Can we just establish the following as this thread has got a bit confusing.

 

1. Do you have a Fuel Cut Defender already fitted? If so, are you saying the fuel cut level on the FCD is raised to 1.2bar?

 

2. Do you have a boost gauge fitted? I presume so if you say you are hitting 1.2bar, but just thought I better check.

 

If your UK turbos are hitting a raised 1.2bar fuel cut level, then I'd suspect that the wastegate isn't opening, which could mean one of the small vac hoses is off or leaking. Check all the hoses to see if you can see anything.

 

 

I had this with BigH's car.

 

Someone had fitted a bleed valve, and removed a boost controller before he picked the car up.. The pipework wasnt put back properly , and there was nothing controlling boost.

 

Both the VSV and the actuator pipework were capped off and boost was creeping upto 1.34 bar.

 

putting the pipework back to standard soon sorted this out, but it took me ages to realise it was wrong.

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