07-18-2009, 05:09 AM
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Registered User
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Join Date: Aug 2007
Location: South Australia
Posts: 512
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 Quote:
Originally Posted by junglejustice
Once the setup is validated on a project here and we go to a built 9.5:1 3.45 litre motor and crank it up to 1 BAR, we should see around 850-900 Nm torque at the wheels and around 520-plus Kw and that is what we are trying to prepare for.
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It's well beyond my experiance, but I will say that, in my opinion, a 9.5:1 compression ratio with such a big bore and running pump fuel (not familiar with U.S fuel octane rating methods, they seem different to the Australian method/rating) with up to 1 bar of boost, it will be interesting to see/read about the tuning used to keep detonation at bay.
Low ignition advance angles at high loads equal huge exhaust gas temperatures.
Exstra back pressure from turbine housings and turbine wheels cause huge heat retention.
Exstra fuel pored down the throat of the engine can only help to a certain point here.
I personally would be looking at an effective water injection system myself. Cheep insurance against a ventilated block or pistons...........
Upping the turbo scale, I'd deffinately then be looking at the Garrett GT30 range.
I'd also look towards the larger turbine housing A/R ratio's (0.84 or even the 1.06) to try and keep the back pressure down and let the engine rev higher to achieve your target power thru more revs than simply massive amounts of midrange torque.
38+ mm Exsternal wastegates (1 for each bank).
I'd also look at getting the exhaust ports, back of the exhaust valves, inside (and out) of the exhaust manifolds and turbine housings ceramic coated to try and help these components last.
520KW+ from a 3.4ltr engine, with a 9.5:1 CR on pump fuel is a big ask.
I do personnally think you are expecting to much, but would love to see you succeed in achieving it.!!!
Deffinately some serious work ahead tho!
Good luck with this project, it will be massive  .
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