At what rpm is maximum torque achieved?
I thought that I read somewhere that it is at around 4800 rpms.

If so, then is it best to set the rev limiter to that number?

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'04.5 350Z Touring, Liquid Aluminum



Edited 1 time(s). Last edit was 2009:06:26:11:37:35.

No, because the power curve around the peak is still higher than the re-engagment point in the next gear. Torque peak may also be less useful than HP peak depending on the load on the engine.

For best performance, you not only want to rev it past the peak torque rpm, you want to rev it beyond peak POWER rpm (which is always higher than peak torque rpm).

Performance is maximized when you shift at a high enough rpm that you do not lose power, or at least minimize power loss, by going from the lower gear to then next higher gear.

For most high-performance cars this means shifting right before hitting the rev-limiter is best for maximum acceleration.

I had the rev set around 5500 for a while. That seemed to be a good number to bang 1st through 4th gear. The car still continues to lurch forward after shifts are made and the rpms stay up.
Maybe I will just go with the "feel" of the car because that little rev light is distracting. I will say that the car is screaming at 6200....

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'04.5 350Z Touring, Liquid Aluminum

Quote:

For most high-performance cars this means shifting right before hitting the rev-limiter is best for maximum acceleration.

It depends on the gear ratio and power curve for each car. Yes, it will be somewhere between the rev limiter and power peak, but not always at the rev limiter. The closer the gears are stacked, the more important the shift point becomes. In a tall gear set, the rev limiter would be right most of the time.

That's why I said "for *MOST* high performance cars..."...

BTW, for the 350Z you DO want to delay shifting until you're about to hit the rev-limiter for maximum performance.

Dommer, for what it's worth, I've had mine shift/rev light set around 6,000 rpm for sometime now.

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Ultra Yellow '05 350Z Roadster, Touring

Nismo: Headers, cams, CAI, flywheel, clutch disc & cover, braided steel clutch hose, 1.5 LSD w/finned cover, oil filter, power steering cooler, cat-back exhaust, radiator cap, thermostat, front & rear sway bars, suspension kit, fuel cap cover, oil filler cap, reservoir covers, hi-flow cats, 480cc/min fuel injectors, 19" LM-GT4 wheels w/Rays lugs & Michelin Pilot Sport PS2 tires. Nissan Motorsports: Carbon fiber apron cover, 3.917 final drive, grounding kit. ARC radiator cooling panel. Unorthodox Racing crank & accessory pulleys w/Gates belts. Pi-Thon reservoir caps. Motordyne: Copper Iso Thermal 5/16" plenum spacer & MREV2 lower collector. Datsun Freeway silver CF engine cover. EvoR silver CF battery & brake fluid covers. Samco coolant hoses & clamps. NRG CF hood dampers. NGK Iridium IX spark plugs. KICS Project magnetic oil plug. Brembo GT front brake kit. SARD Electrical Sweeper. Walbro 255lph fuel pump. B&M Racing short-throw shifter. D-Wolf clutch kit. '06 OEM projector headlights and LED tailights. OEM/Europe burnt orange leather steering wheel, shift knob & e-brake handle. 3M invisible bra. Stillen grille insert. 40 tint. AAM ECU reflash & Unichip custom tune.

Mine's set to 6,700. RPM is your friend.

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John Coffey
[www.betamotorsports.com]

Rev's are your friend. Take it as high as you dare.

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1985 300ZX n/a

See my Z project

phxZ31 Wrote:
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> Rev's are your friend. Take it as high as you
> dare.


Exactly...why can nobody give me a real number on non modified Z?
RPMs are our friends until you miss the high number then...oh well.

I really loved seeing the 370z taking it to the V8 Stang...Haha.

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'04.5 350Z Touring, Liquid Aluminum

If the red line is at 7,500, then you can take it up to 7,500 RPMs before you need to be concerned with anything. Obviously you shouldn't drive it like that ALL the time, that's what I tend to do though and its bad for things.

If you're really curious about your car, the best way to find your shift point is to get your Z on a dyno and race it a few times. You may find that you get the best quarter mile time on the dyno when shifting at redline.

But in the end it all depends on the car and whats done to it. When my Z31 was stock, I would shift at 5,500 to get my fastest times even though the redline was at 6,000. Now that I've changed out the cams, valve springs, cam gears, etc etc.. I take it up to 7,200 RPM in first and second (although I really should kill it earlier, it just sounds so cool) and 6,500 RPM in 3rd and 4th. I suspect once I change out the pistons for ones with a 12.5:1 compression ratio and re-port the intake runners again, I should be able to get my rev's up to over 8000RPMs of usable power.

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1985 300ZX n/a

See my Z project



Edited 2 time(s). Last edit was 2009:06:28:23:52:06.