what is the highest rpm the sr20det can be revved to without destroying the motor? this guy at work claims an sr20det "can be revved to 12k rpm with the rev limiter unlocked from a chip that u can program"... his words, not mine.. yea i know.. sounds like a moron. anyway, his infinite wisdom from going to street races, and working as a valet parker, he claims that stock sr20det will smoke stock ls1 camaros... now im not trying to start a god forsaken war between imports and domestics... i love nissan, but its retards like this guy that keep me from getting one. so what is the rev maximum/ with the rev limiter unlocked?
The biggest limitation would be the cams you use. If you look at any dynoplot, you'll notice that a few hundred rpm before the redline, the amount of power the engine makes starts to drop. Basically what happens is the valves open then close so fast, not ehough air makes it in as before and you've passed the point where extra power strokes can't make up for it. Basically, once you pass that point, going beyond it is useless, your making less hp the further you push and you'll quickly drop below the power level you would be making if you shift.
The other problem is your engine is only designed to rev to that point and maybe a few hundred rpm after. Your valvetrain isn't designed to operate at 12k rpm so it can't. Basically if you could get the engine to that rpm, the valve springs wouldn't be strong enough to keep the valves following the cam lobes and would leave the valve hanging out in the combustion chamber (also known as valve float) when the piston comes up, if they make contact, you need a new engine.
Long story short, no, by simply rechipping a computer and removing the rev-limiter, you can't take an engine to 12k (well, you could but it won't survive). As for the LS1 comparison, I think, stock for stock, an SR20 would give a camaro a good run for it's money but wouldn't have enough. Who keeps their SR20's stock though.
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HybridAndy - 240sx/SR20 owner
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valve float starts to occur at roughly 8500rpms or so on a SR20DE with stock cams/valve springs.
Even if you could get the valves to not float at 12k rpms, I believe the engine stroke is too long (giving too high of piston speed) to make 12k. Not even race motors based off of street car engines rev to 12k.
the guy at work needs to lay off the crack pipe and get an education
Yeah your talking indy car RPM's here, we don't need honda revs to make horsepower. Nissan has heard this rumor about something called I think "torque" and eliminated that problem.
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1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI, Under Construction
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the piston speed is way to high on a sr for 12k.
if it were slower, the cams were more topend cams, and you had a better valvetrain design....i would see 10k as being possible. and the power wouldn't drop off at 7500 with the piston speed changed, and the cams changed.
i have taken a sr16ve to 9500 rpm. but that motor is a lot different.
Shaun
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