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Anyone ever built one?
Plenty of info on the net and could pick up the parts for about a tenner, but are they safe? what about boost spikes?
I'm don't know much about turbo cars to be honest but I'm happy to grab a bargain and build my own if its gonna work and I have been told the cheap MBC's are not great either.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Aug 14, 2011 10:20:15 GMT
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Using a "bleed valve" is pretty much one of the worst ways to control boost IMO, the best of the cheap types to use, are the ball+spring types Instead of the boost building up, and slowly building up at the wastegate, (which invariably slowly starts to open earlier than you want) there's a small ball-bearing sealing the entrance to the wastegate, held in place by a spring. When boost gets to the amount that you want, the ball-bearing cracks open against the spring pressure, allowing the wastegate to open. When my uni loan comes in, I'll be getting one  about £20 on fleabay, and well worth the pennies! |
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Last Edit: Aug 14, 2011 10:21:24 GMT by chairchild
You're like a crazy backyard genius! |
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Aug 14, 2011 10:29:57 GMT
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You're like a crazy backyard genius!
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Aug 14, 2011 12:30:12 GMT
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The best DIY boost controller is a boost level activated PWM controlled electronic bleeder valve. You'll have to be handy with the soldering iron though |
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Aug 14, 2011 13:30:57 GMT
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I've got a ball bearing type in the garage off my Brat as I've upgraded to an electronic boost controller,you can have it for a tenner posted if that's what youre after as it worked fine for me until my "upgrade"!
Tim
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1974 Chevrolet C20 Camper Special Pickup Truck 2002 Fiat Multipla oil burner SOUTHWEST SWAPMEET southwests best car parts selling page on facebook for retro/custom/classic www.facebook.com/groups/249875865097198/ |
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Aug 14, 2011 14:45:54 GMT
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They do spike bad my MR2 was set to .8 bar and would of spike over 1bar (hence why it was set to .8 not 1 bar like I wanted)
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Some days you just need to take a grinder to an inanimate object, just to make your day a tiny bit better!!
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ChrisT
Club Retro Rides Member
Posts: 1,637
Club RR Member Number: 225
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DIY manual boost control valveChrisT
@christ
Club Retro Rides Member 225
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Aug 14, 2011 14:52:32 GMT
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What type hoses were you using to connect the valve?
I found my SX spiking when using silicon vacuum hose, which aren't really designed for boost - replaced them with proper rubber ones and the spiking went.
Put it down to the hoses expanding ever so slightly before opening the valve
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Last Edit: Aug 14, 2011 14:53:29 GMT by ChrisT
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Aug 14, 2011 16:48:33 GMT
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What about these? www.ebay.co.uk/itm/MANUAL-BOOST-CONTROLLER-SMOKED-GAUGE-IMPREZA-WRX-STI-/360385018364?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item53e89ef9fcObviously they are dearer than a tenner, but i have to buy a gauge as well as the volvo ones don't have numbers on and my LPT version don't have a gauge anyway. The ECU cuts the ignition at 15psi, but the engine should be able to take more than that anyway so if i run it around 12 to 13psi i should have a safety margin if there is any doubt about boost spikes? I am happy to buy a second hand one but that one comes with all the extra bits and bobs and the gauge, so its probably no dearer overall. Does that sound sensible? its a 500 quid car so its not like its gonna cost me a fortune if it goes bang and this one is pretty much just a practise run for building a much better looking, more powerfull 16v one in the future.  |
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Aug 14, 2011 18:21:26 GMT
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The type in that link, is just a cheap and nasty bleed valve - it's only one up from the £10 brass types.... it just looks shinier
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You're like a crazy backyard genius!
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about £20 on fleabay, and well worth the pennies!
