DYNO Kinetix Velocity Manifold VS MD 5/16th spacer
08-30-2013, 11:00 AM
#23
Registered User
no...smh, your supposed to use the shift points where you maintain the highest average tq/hp. there is not point reving to 8k if you only making 190hp and 150tq, unless 6.5-8k would yield the highest average power.
this has nothing to do with peak hp
you guys are misinterpreting what im saying.(typing)
this has nothing to do with peak hp
you guys are misinterpreting what im saying.(typing)
Last edited by freddys 350z; 08-30-2013 at 11:04 AM.
08-30-2013, 11:31 AM
#26
Registered User
http://www.datsuns.com/Tech/whentoshift.htm
this will prove you wrong. and since i know your a troll on this site. this is the last time im replying to you.
08-30-2013, 11:37 AM
#27
Super Moderator
MY350Z.COM
MY350Z.COM
iTrader: (8)
08-30-2013, 11:47 AM
#28
thats the deal...neither of you should be shifting at redline. neither of you are making power at redline.
the md's best shift point would be 6,200rpm
yours would be 6,400rpm.
the md makes more overall power in power band.
i can go on, but just line up against it and see for you self.
the md's best shift point would be 6,200rpm
yours would be 6,400rpm.
the md makes more overall power in power band.
i can go on, but just line up against it and see for you self.
Last edited by 1cockyZ; 08-30-2013 at 11:52 AM.
08-30-2013, 11:53 AM
#29
I can kinda put the redline shift peak shift thing. Me and a ex employee at CIN bet on this same thing. On CINS dyno you can quarter mile test your car. Really fun when doing before and after mods. Anyways I gave him 3 runs I took one. Beat him every time. Btw I bet your faster at redline over peak drop off
08-30-2013, 01:16 PM
#30
Retired Admin
iTrader: (95)
You might not have typed the phrase "shift at peak ___," but based on the information presented in the OP and per your recommendation, it certainly reads that way. Clearly, I'm not the only one who read it that way.
And NOBODY even hinted at shifting at redline, so you're putting words into other peoples' mouths/hands -- whatever.
For the record, you want to upshift when the power you put down to the ground in the lower gear becomes less than the power you put down to the ground in the higher gear. Said in another way, the rate of acceleration at the higher rpm in a lower gear is less than the rate of acceleration at a lower rpm in a higher gear. Otherwise, why the hell upshift when you're trying to accelerate as fast as possible? That means you need to take into account not only the shape of the graph and redline, but also gearing.
So, no, you don't always shift right after the peak nor do you always shift right at redline.
Now, I didn't bother reading the article you linked but if it doesn't mention gearing, then you need to find a better source. Eh, but what do I know, right?
And NOBODY even hinted at shifting at redline, so you're putting words into other peoples' mouths/hands -- whatever.
For the record, you want to upshift when the power you put down to the ground in the lower gear becomes less than the power you put down to the ground in the higher gear. Said in another way, the rate of acceleration at the higher rpm in a lower gear is less than the rate of acceleration at a lower rpm in a higher gear. Otherwise, why the hell upshift when you're trying to accelerate as fast as possible? That means you need to take into account not only the shape of the graph and redline, but also gearing.
So, no, you don't always shift right after the peak nor do you always shift right at redline.
Now, I didn't bother reading the article you linked but if it doesn't mention gearing, then you need to find a better source. Eh, but what do I know, right?
08-31-2013, 07:14 AM
#31
I always shift at redline at the strip. It's how I got my pb stock time of 13.7 with street tires. Also how I got my best trap of 102.
The kinetix makes more power than the spacer to 7200 RPMs, a lot more. I will be faster with the Kinetix and I'll prove it at the track.
The kinetix makes more power than the spacer to 7200 RPMs, a lot more. I will be faster with the Kinetix and I'll prove it at the track.
08-31-2013, 10:59 AM
#36
Retired Admin
iTrader: (95)
Yeah, on our cars with stock gearing, redline, and power curve, shifting at redline will yield the most favorable result.
13.7 is pretty respectable. Is your time on the Top 25/50 Drag list?
13.7 is pretty respectable. Is your time on the Top 25/50 Drag list?
09-01-2013, 08:36 AM
#39
Here's my .02 with graphs. This is just for curve comparison because these dynos were done a year apart. Once I get a spare plenum so I cut all the posts on the underside off, I'll be retuning it and compare curves. But that may be awhile before I can get that done.
This graph is kinetix V+ plenum with Cobb MAF hose, 3" MAF housing, and JWT pop charger. The curve is pretty smooth all the way to redline. It's not the velocity plenum, but the curve looks pretty similar.
This graph is the MD 1/2" spacer with Cobb hose, 3" MAF, and '06 air box. The curve dives fairly sharp after peak power at 6200. However I did make more power across the RPM with the 1/2" spacer over the V+.
This graph is kinetix V+ plenum with Cobb MAF hose, 3" MAF housing, and JWT pop charger. The curve is pretty smooth all the way to redline. It's not the velocity plenum, but the curve looks pretty similar.
This graph is the MD 1/2" spacer with Cobb hose, 3" MAF, and '06 air box. The curve dives fairly sharp after peak power at 6200. However I did make more power across the RPM with the 1/2" spacer over the V+.
