Just curious really. If you gave car enough welly in reverse would turbo still spool up?

 

Yes, unless, it also works in reverse, and sucks, instead of blows


Mark.

 

And if it was one of your then it may well do

 

Andy,

Yep, but it would be the best suck job you'd ever had

So, fancy 210mph..............backwards

Mark.

 

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

 

It would spool backwards but you can cure this if it was important to get full boost in reverse.

 

why wouldn't it ? what a strange question.........do you really think the engine runs backwards ????????????

 

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.

 

they do! i dont get it. Of course it would spool up if the exhaust flow is sufficient. Try it!

 

Gearboxes love to be redlined in reverse, yes i think you should try it

 

Yeh, go and try it and let us know what happens

 

Which turbo do you have in mind because they all have different characteristics. My TD05-06 20 G witha ported W.G. is boosting Ok in reverse but it comes in pretty viscously and there is lots of tyre spin when it takes off.

 

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.

 

SNIGGER.....

 

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?

 

why don't you try a j-turn while your at it, i'm curious to see if that would work as well.

 

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.

 

Is that why twin turbo's (supra's / skylines etc ) can't corner ?

 

Forget an FMIC, you'll be in need of an RMIC

 

So are you saying it wouldnt spool then?

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'

 

Yep, if only they'd thought it through and put one turbo on each side of the engine, not both on one side, those Toyota boys eh..

 

So dose that mean the dump valve would go "hsssssit" in sted of "tissssh

 

It wouldn't dump, it would ingest...think of Cat's experience on Backwards World

 

My college tutors celica makes a swoosh in reverse...




but we reckon he's just got a tape player with a "Tishhhhhh" sound on it after all, he has got a novelty horn!

 

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.

 

I am now hanging my head in abolute shame


Tis true what they say - a little bit of knowledge is a dangerous thing.

 

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 thread's brilliant!

 

No it aint

 

......but its very informative