Nissan 370Z Forum

Nissan 370Z Forum (http://www.the370z.com/)
-   Track / Autocross / Drifting / Dragstrip (http://www.the370z.com/track-autocross-drifting-dragstrip/)
-   -   redline/peak H.P/ & H.P curve-When to shift?? :) intresting??? (http://www.the370z.com/track-autocross-drifting-dragstrip/76043-redline-peak-h-p-h-p-curve-when-shift-intresting.html)

andre12031948 09-05-2013 07:08 PM

I blame myself for not having a clear enough explanation
 
Quote:

Originally Posted by DEpointfive0 (Post 2474609)
I said it first!!! Lol

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 09-05-2013 07:21 PM

Quote:

Originally Posted by andre12031948 (Post 2474741)
2)4:08 gearing-That makes the car get going quicker & gets quicker to the desired shifting point. It also makes the after shifting RPM drop much shorter(not drop so much).

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.

andre12031948 09-05-2013 07:30 PM

Quote:

Originally Posted by phunk (Post 2474753)
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.

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

Chuck33079 09-05-2013 07:47 PM

Quote:

Originally Posted by andre12031948 (Post 2474741)
Don't forget to raise the redline.

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

andre12031948 09-05-2013 07:59 PM

Quote:

Originally Posted by Chuck33079 (Post 2474795)
This is bad advice. More than a few members have had oil pump failures due to raising the stock redline.

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 09-05-2013 08:02 PM

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

Originally Posted by andre12031948 (Post 2474816)
I never saw a post about that. Why would an oil pump fail???

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?

synolimit 09-05-2013 08:03 PM

Quote:

Originally Posted by andre12031948 (Post 2474816)
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...

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

Any aftermarket higher flowing units?

Chuck33079 09-05-2013 08:05 PM

Quote:

Originally Posted by synolimit (Post 2474821)
Out spins the ability of the oil gear. Probably cracks and breaks on the housing spinning to hard.

Any aftermarket higher flowing units?

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.

andre12031948 09-05-2013 08:20 PM

Quote:

Originally Posted by Chuck33079 (Post 2474822)
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.

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

Rusty 09-05-2013 09:02 PM

Quote:

Originally Posted by andre12031948 (Post 2474846)
Very surprised. Sorry to hear that. I would think an N/A car would not need an after market fuel pump.

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. :icon14:

Sh0velMan 09-05-2013 10:09 PM

Quote:

Originally Posted by Rusty (Post 2474920)
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. :icon14:


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).

Rusty 09-05-2013 10:42 PM

Quote:

Originally Posted by Sh0velMan (Post 2475009)
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).

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.

DEpointfive0 09-05-2013 11:49 PM

Quote:

Originally Posted by Rusty (Post 2475039)
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.

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!

synolimit 09-05-2013 11:55 PM

Quote:

Originally Posted by DEpointfive0 (Post 2475138)
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!

Normal or under drive?

DEpointfive0 09-06-2013 12:27 AM

Quote:

Originally Posted by synolimit (Post 2475142)
Normal or under drive?

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


All times are GMT -5. The time now is 11:08 AM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2