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...

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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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

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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Rusty

It's just my opinion. Connecting the dots more or less. From some things that I have read. Seen first hand. Experienced myself. Like breaking a forged crankshaft in a Chevy LT1 I had some years ago. Having some friends who broke the oil pumps on their Hemi's.

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DEpointfive0

Ding ding ding!!!

Those were most likely externally balanced. 99.99999% of new cars are internally balanced.
I have the Stillen pulley and I LOVE IT, great bang for the buck!

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synolimit

Normal or under drive?

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DEpointfive0

20% UD, OEM size is a bit useless IMO

One of my favorite mods, won't say MOST because its not a huge gainer, but I took it off to take to the dealership, and the difference is night and day
Revs so much nicer with it

I have a brand new one that I couldn't install on my first Maxima, and now that my pops has a Maxima, I'm gonna install it on his without telling him, lol

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