turbo in reverse gear?
#4
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Andy,
Yep, but it would be the best suck job you'd ever had
So, fancy 210mph..............backwards
Mark.
Yep, but it would be the best suck job you'd ever had
So, fancy 210mph..............backwards
Mark.
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Originally Posted by harvey
It would spool backwards but you can cure this if it was important to get full boost in reverse.
I'm no expert but i thought turbos worked off exhaust gases, which work exactly the same way no matter what direction the car is going.
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Originally Posted by cookstar
Why would it spool backwards???
I'm no expert but i thought turbos worked off exhaust gases, which work exactly the same way no matter what direction the car is going.
I'm no expert but i thought turbos worked off exhaust gases, which work exactly the same way no matter what direction the car is going.
#15
Maybe a twin turbo arrangement using a flap engaged by the reverse gear sellector to control which turbo is used and an early EVO turbo for the oposite direction spool would do the trick?
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It's a fact that evo's are quicker on left hand bends that scoobs due to the gyroscopic effects on the reverse spin turbo, of course the scoob makes the ground up again on the right hand bends.
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Originally Posted by Butty
Yes, but you'll need to have your scoop to face the other way. Perhaps mount a second scoop on the boot lid and feed the IC with Safari style intake pipework?
Nick
Nick
#20
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Originally Posted by Andy.F
They do work off exhaust gas but think about it, if you go fast backwards then the pressure will build in the exhaust, this in conjunction with the reversed flow across the scoop and low pressure in the engine bay could result in a reverse spool surge event.
This is confusing me a bit.. I thought the air that came into the scoop was to cool the intercooler down and nothing else. Ie when people have frontmounts they sometimes loose the scoop altogether.
Not being funny, cos i know you know your stuff mate.
Just askin'
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Originally Posted by stevem2k
Is that why twin turbo's (supra's / skylines etc ) can't corner ?
#25
The reverse airflow through the radiator will create a negative vortex that equalises vertically at 20-22.5mm central to the jiggle pin in the oil pump. when this happens, the hydrodynamics of the oil under these conditions,through a sequence of thermal transposures, creates random 'hot-spots' in the catalyst honeycomb. as each implosion takes place a series of inverted vortices travel (7th Principle of harmonic gasflow) in the opposite direction to 'actual' exhaust gas flow. the knock-on effect of this is 'turbo-syphoning',where the turbine wheel literally tries to 'suck' itself off. the rapid sucking and blowing creates negative boost in the compressor housing resulting in reverse rotation. only right hand drive models of impreza my92 to my01 are affected.
oddly, this doesnt occur in the EVO.
oddly, this doesnt occur in the EVO.
Last edited by buzzard; 29 October 2005 at 01:37 AM.
#27
Overpresure
Think about it?
(This is just a theory)
All that pressure running back up the exhaust, the turbo wastegate open but no where to go, pressure builds exponentially until……..
KABOOM!!
and your left sitting in the middle of the road wearing nothing but the charred remains of your skiddies.
Its witchcraft…don’t go there!
(This is just a theory)
All that pressure running back up the exhaust, the turbo wastegate open but no where to go, pressure builds exponentially until……..
KABOOM!!
and your left sitting in the middle of the road wearing nothing but the charred remains of your skiddies.
Its witchcraft…don’t go there!