GT4EC - The GT-Four Enthusiasts Club
General Category => The Chill Out Room => Topic started by: bazza2541 on October 22, 2008, 11:43:11 pm
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I was thinking about the engine in my 165 and what to do with the one I bought off Paul when I had an idear.
I want to use a holset HX35 but there isn't enough room, so hows about mounting it behind the back bumper?
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you've more money than sense
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They do it in Yankeeland to those corvette-thingys.
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The way I sees it, the exhaust gasses will be cooled down a good bit by the time they reach the turbine and so won't meltify the diesel turbo?
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Like this (a bit)
(http://www.turbochargers.com/store/images/c6-kit.jpg)
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And if I fuel it with LPG, I can run a 12.1 CR.
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On the plus side you get
*Reduced under bonnet temperatures.
*Cooling effect of under-car airflow on exhaust gasses.
*Cooling effect of under-car airflow on oil pipes.
*Marginally increased turbo lag (hopefully).
*Cooler running turbo.
On the minus side you get
*Nuthin comes to mind.
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guy in the states done that style of set up on a new M5 with mad power, that would be some serious work and a serious amount of cash to fund it
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Nah, it would need some lengthened oil feed and return lines, longer intercooler piping and some mounting brackets. Those lorry turbos are cheap as chips.
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go for it matey, i can't wait to see the finished beast 8)
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yes, the idea of the rear mounted turbo is intriguing. would definitely prolong the life of the tubby but serious lag could be an issue
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how does the oil return work on a setup like that?
i always thought that a minimum 30 degrees angle of the dangle was needed between the tubby drain and the sump?
being gravity drained the oil wont run along horizontal lines all the way to the engine?
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probably an inline feed and return pump could settle that issue peter
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probably an inline feed and return pump could settle that issue peter
Yeah a supplementary pump is the way to go, acts like a turbo timer too.
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http://www.ststurbo.com/ (http://www.ststurbo.com/)
have a look here, might help you with a few ideas
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Pros:
Cooler underbonnet.
More space underbonnet.
cons:
Lots of extra pipework
Extra lag problems
Where's your IC going?
Impact from ground objects?
Turbos work most efficiently when using the uber-hot gases from the exhaust port - they work by extracting the heat energy. You need the whole length of the cars exhaust to be sealed perfectly as any loss before the turbo will hurt power further.
Oil drain I cant see being a problem providing it is kept above sump height and the exit pressure is lower than the intake pressure by some way. A small pump would sort it otherwise.
Large water/oil mass in the hoses to the rear of the car.
Seems like more cons than pros to me, but it woudl be interesting!
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Lag is not an issue.
IC will be going behind the bumper.
Surely its the exhaust gas flow that turns the turbine, not heat?
Oil supply is not an issue either.
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Its not quite as simple as having teh same flowrate at each end of the exhaust so the turbo can go anywhere, the turbo extracts the kinetic energy of the gas. As the gas flows down the exhaust it cools and slows, losing energy as it goes due to the cooling. This loss of energy is what you'll be wasting by placing the tubby at the cold end.
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I think I can risk it. I can't find anywhere else to fit my chosen turbo.
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It'll be good to see it working, keep us updated!
Thats the sort of thing you're thinking?
Buy lots of lagging!
(http://images.paultan.org/uploads/2007/02/bmw_m5_twin_turbo_7.jpg)