14 replies to this topic

[Big_Adam]

Yo,

Well I've seen this twice on turbo cars. Once on top gear and once in mini world. I'm talking about a boost button. It meant to be a button or switch that ups the boost from the turbo therefore making the car faster.

I was wondering if these really...well do anything? If so how the hell do they work!

Ta for any info from a misguided fool.

[JetBLICK]

They're just a kinda two stage boost controller. So you can run a sensible level of boost everyday, then a higher level at a flick of a switch.... like one of these

http://www.demon-twe...e=AETFG-GBCV-DS

No idea how the actual thing works, but all turbos have a boost control valve which ...er... limmits the boost level ... this somehow can change the boost level to another pre-set level from inside the car. Of course they work, as you basically letting more air in to the engine by de-restricting the boost to a certain level.

Edited by JetBLICK, 13 August 2007 - 06:49 PM.

[redhotmini]

iirc, its a solenoid valve. someone i know has one fitted, not sure how he has it plumbed in but it runs standard metro turbo boost level (4 or 5psi?) then a flick of the switch and its up to something silly like 15psi. i think its in line to a bleed valve or something. apparently the valves can be found on most early metros, used as an anti run on valve.
sorry i cant be of more help, i dont know a great deal about turbos.

[Turbo Nick]

i've got one on my car, day to day runs 10psi which is around 120/130hp ish.

then i've got an output from my ECU which will open a solenoid after 4000rpm to up the boost to 15psi (160ish bhp), but it'll only open if the switch is flicked.

i've done it for a couple of reasons really because the cars my daily driver. i dont want to be putting that much power through it day to day, plus if you try and launch it with 15psi it just sits there wheelspinning, so as i change to 2nd gear i flick the switch to give me full beans which seems to work quite well.

both my low and high boos are tuned with bleed valves so not the most accurate/efficient way of doing it but it suits my budget

[M111KYP]

you sure hes not on about nitrous????????????

mikey

[Ethel]

Bud's said it all really just a valve that bleeds off some of the pressure that would open the waste gate.

I was thinking of doing similar with a switch built into the gear selector not only would you rip the tyres off the road in second you could also trash the gearbox.

[alexcrosse]

the one in "ultimate mini performance" has one i think. Two buttons on the gear stick.

[M111KYP]

if its not NOS you can only run switchs like that or boost controllers if ur using a ECU and alot of people dont run with them.

mikey

Edited by M111KYP, 14 August 2007 - 10:40 PM.

[Ethel]

It would complicate the ignition timing a little but that's a problem anyway with a turbo.

[M111KYP]

"It would complicate the ignition timing a little but that's a problem anyway with a turbo"??????????

what do maen?

mikey

[biggav]

you need to retard the ignition so the spark occurs a little later on.

[roofless]

cut out and stick to dash-board...........

[Turbo Nick]

it wouldn't complicate the timing and you dont need an ECU to run a boost controller.

timing wise you have the car set up at full boost, then just run it on low boost and when you flick the switch for high boost you know its already setup to run it so no problems.

the only reason my ECU fires my solenoid is because i've got an ECU with spare outputs so i thought i might aswell use one of em, plus it makes the car a bit smoother especially on the road. Seeing as i'm running a T25 it makes its boost a lot sooner than the std T3, mine would be making 15psi well under 4k rpm and its just crazy (but fun) trying to keep it in a straight line and the wheels not spinning in 1st/2nd/3rd. so it just ups it to 15psi over 4k and makes the power delivery a lot smoother and less of a kick in the arse like you get from a big hit of boost.

Edited by bud666, 15 August 2007 - 12:31 AM.

[M111KYP]

[quote name='bud666' date='Aug 15 2007, 01:29 AM' post='618576']
it wouldn't complicate the timing and you dont need an ECU to run a boost controller.

how does a boost controller work without a ECU then?

mikey

[stevenford_uk]

it does exactly what it says on the tin!
it has a boost input and it controls the actuator by means of a solenoid that can acuratly meter the air going to it. it also needs rpm input, power etc.
its basically an ecu just for boost