redline/peak H.P/ & H.P curve-When to shift?? :) intresting???

andre12031948

Simple
If you have completely stock car, shifting right before the redline, which is past the peak/highest h.p. the car produces is fine.

When you get moded & tuned, the peak h.p. redline, & turq & h.p power curve changes. You also want mods & tune that give you a longer steady flat top h.p. chart, instead of a quick up to the highest h.p peak & a quick fall. Even if that H.P. is higher!!!!

I can guarantee a twelve second 370z with only doing 3 things to the car.

If you know how to drive these 3 things will make the car quicker & faster than any other mods you do. N/A of course

1)Good tires for traction a must-The first 60' feet is where you lose or gain the most of your 1/4 mile run.
2)4:08 gearing-That makes the car get going quicker & gets quicker to the desired shifting point after each shift.
3) Its a two parter. Take off the power robbing cats & replace them with test pipes with a mandatory(because of the change) TUNE!! Don't forget to raise the redline.

Don't bother with intakes/exhaust or anything else. The car will be a twelve second car.

phunk

This part is not correct RPM drop between shifts is an agreement between the engine and transmission, and the car doesn't even need a differential installed to know exactly what the drop is.

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andre12031948

I think you're right. The rest of the statement is correct.

Chuck33079

This is bad advice. More than a few members have had oil pump failures due to raising the stock redline.

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andre12031948

I never saw a post about that. Why would an oil pump fail???

Almost everyone who got a tune had their redline raised. That's a lot of people...

synolimit

Out spins the ability of the oil gear. Probably cracks and breaks on the housing spinning to hard.

Any aftermarket higher flowing units?

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Chuck33079

There's at least two guys that lost their motors from oil pump failure running a 8k rpm redline. Z Eliminator and somebody else. Sam at Gtm also strongly advised against a higher than stock redline. The internals of the oil pump come apart at that speed. There's a Nismo unit with hardened internals, but its pricey.

Most people don't take theirs to the track. That's where failures occur. How often is someone at 8k rpm on the street?

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Megan370z

the somebody else is probably me,
Yeah I blew the oem oil pump last year, in the very beginning we thought about the oil pump was the problem but after review of the event and datalog.
The verdict was the engine got oil starvation for half of a second which did a lot of damage to one of the VVEL head.

I limped back home then 200kms later the oil pump blew in thousand pieces !

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Chuck33079

Why did the motor oil starve? How high were you revving that motor?

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Megan370z

Time Attack, the rev limit was 8000 or 8050 .....

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venus

At the point where performance is key this is simple if you use The Force. I’ve had a couple 13B rotary RX-7 engines custom built for me which redlined at all but Formula One RPMs. The power curve was blown through in the blink of an eye and you were off the scale. Pegging was common w/ no rev limiter so who knows how high RPMs reached. Some of my buddies drove their 7s like a bat out of Hell till the apex seals came apart. I drove on instinct and shifted a nanosecond after I felt the power drop – which was something that can’t be charted or measured. It’s an animal thing.

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Chuck33079

That's exactly the issue. The Nismo unit is the only other one I know of. It's got a billet gear inside as opposed to ours, which I believe is sintered metal.

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andre12031948

Very surprised. Sorry to hear that. I would think an N/A car would not need an after market fuel pump.

Rusty

Oil pump.

I believe that the lightweight crankshaft pulleys add to the problem of the oil pump failures. The lightweight pulleys change the harmonics on the end of the crankshaft. They set-up a vibration that can't be dampened out. Since the oil pump is driven off of the front end of the crankshaft. The vibration goes into the oil pump. breaking the gears in it. Dodge Hemi's have the same set-up almost. And there have been quite afew failures of the oil pump with the light weight pulleys on them too.

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Sh0velMan

Can you post ANY relevant information on this, or is this more "Lightweight Pulleys are the debil" hearsay?

And by relevant, I mean at least two VQ37VHR's with lightweight pulleys and oil pump failures at 'Normal' RPMs (ie, not revved to 9K where they blew up... revved to 7500-8000 where they blew up).

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