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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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#31 | |
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maybe you've got numbers wrong, or maybe he's running a diesel engine. 100octane would be less than the c116 race fuel I implied he might be using... but even then, 13.1 compression and 25psi = blown engine. It wouldn't matter if he had adumantium alloy pistons or something.
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#32 | |
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#33 | |
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#34 |
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Corky? is this the guy that wrote the books on exhuast and turbos and all the factors??? Right, we dont listen to anything he said, he said all we need is 2.5 exhaust.. and it has been dynoed that 3" exhuast yeilded a couple more hp's... he is a smart man, just dont beleive everything everyone says.. like you guys dont believe me.. like I said in a previous post, the guy has worked on this engine for years, and has finally come up with a combination that works for him.. maybe some of you arnt willing to take the time to trial and error as he did.. which he knows 13.1 compression and 23psi wont work, but he has done othre things to lower the compression when he turns the boost up.. one of the biggest factors is a long duration cam.. which lets what isnt needed squeez out of the valves at the end.. which he says, gives him the most compression and boost possible under any condition...
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#35 | |
Nissanaholic!
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#36 | |
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I mean.... I wish I could swap a 13B engine into my car and get some high duration cams for it. I'd be the man. Then I'd have to run a NOS cooled intercooler so the rings don't fry. ![]()
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#37 |
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this thread is too funny, its stupid.
pointless thread in the "land of make believe" ![]()
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#38 | |
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#39 |
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Ohh, sorry for jacking the thread.. Ill leave if you want me too.. but dont bash on my freind for taking 5 years to make a bad ass engine..
Kreator, why dont you copy and paste just a little bit further.. "he is a smart man, just dont beleive everything everyone says.. like you guys dont believe me"
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#40 |
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yeah, take away the mathematical and physical proof and Corky Bell really doesn't make any sense. I suppose if there was some rationale or any sense in what you're saying, we'd probably believe you just like we believe Corky.
But... reducing compression with overlapping cams.... and on a turbo engine?? You do realize the mathematical compression ratio is not changed. The actual compression ratio might be, but at a large loss of any boost built up. So, if what you're saying is indeed true, he's overworking the turbo for no reason. The actual boost in the combustion chamber would be far less than the boost as read in the intake manifold. Driveability would SUFFER (poor flow control at low RPM... and assumably if the overlap is enough to reach the compression stroke, it would be FAR worse than any high duration NA setup), as would response and high end power (you're killing lot of boost). Well... if it works (as in runs), that's great. But you've at least got to admit the sheer stupidity of it. Out of curiosity: would you mind explaining how he prevents or safeguards against "misfiring" in the exhaust manifold when he's losing air and fuel into the exhaust stream from his high duration cam?? How often does he have to replace the turbine? Lots of people here have asked about misfiring systems.... so I'm sure they'd like to know.
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#41 |
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Gimme my thread back ^_^;;
you guys can keep rambling about imaginary engines... but id like to know at least some real numbers for the T3.. please? ?RWHP@?Psi
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#42 |
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Ok according to my (probably wildly inaccurate) calculations
based on the map of the 60 trim T3 at turbonetic's website running 10 psi i should expect to see 170 gain in flywheel HP? putting my s14 at a little over 250 at the wheels? am i going about this all wrong? >_<
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#46 | |
Nissanaholic!
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#47 |
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so what kind of loss am i looking at? hard to say?
think i should just use the t3/t04b instead to make my 250 or so rwhp? sorry still confused... maeda
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#48 |
Nissanaholic!
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don't think in flywheel hp. Just figure out what you want to be making at the rear wheels. I dont' remember the compressor graph differences on 50 vs 60 trim, but from what i remember the 60 will take you farther hp wise with decent efficiency. 250rwhp will be easily handled by t3 60. t3/t4 will take it farther, but at hte cost of spool up. Now you can get rid of lag with a ball bearing, but thats extra $500 probably noone wants to spend.
final note: if 250rwhp is your final goal, t3 60 will be your best bet. |
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