Pulls on the highway

[Chameleon]

:lol:

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[Waldorf]

Be Efficient

The more important factor is where you are in that power band once you make the shift to the next gear... that will determine good shift points.

Ditto!

robmustang201528... If you're nerdy (or not), try this:

http://www.f-body.org/gears/

Yeah, it's a Camaro (dollar in the swear jar!) site, but the chart works... calculations are right on the money. Accurately fill in all of the parameters on the left, then hit calculate. Note the top speed in each gear in mph. Move one column right to find that speed. Once you've found it, look straight across the row to the RPM column. That will tell you where the engine revs will end up (rev drop) after the shift at the "Redline (RPM)" value. Adjust the "Redline (RPM) value to put the RPM drop in the fat part of both curves on your dyno printout and recalculate. Shift points may vary slightly with each gear change due to uneven steps in gear ratios. There ain't no "perfect" transmission. That's making the most of whatever you have. The above chart AND your dyno sheet should help you a lot.

As an added bonus if you order now!

When you think you've got it nailed down, either print the page, or save the complete page as an HTML file for reference. This whole procedure is mathematically correct. Real world will vary slightly, but it's real close. And remember, without torque, there IS no horsepower.

No warranty is offered... whether expressed or implied. Your mileage may vary.

That is all...

 

[robmustang201528]

Ok thanks guys for all your help. I'll pull up beside him next week. See what happens

 

[robmustang201528]

I know this questions has been asked before but do u think my stock mufflers are restrictive? What can I do to get those tq numbers up?

 

[anotherneon]

I know this questions has been asked before but do u think my stock mufflers are restrictive? What can I do to get those tq numbers up?

Drive to Baltimore MD and get tuned my Adam at Rev auto? Do you have a baseline dyno? Don't get hung up on numbers from a tool used for measuring. It's no different from a scale when trying to lose weight, they all read differently and they all can be manipulated. Wait until it gets cooler outside and then throw it on the dyno if that will make you feel better.

 

[Barrel]

Stock mufflers aren't restrictive at all. Maybe 1 or 2hp. Maybe.

 

[Walt1120]

Here my dyno sheet

You want to shift at whatever rpm range is gonna give you the most average power. Lets say for example that when you shift into the next gear the rpms will fall 1500rpm.

Shifting at 6500, youll fall to 5000 and shifting at 7000, youll fall to 5500. Obviously by looking at the graph you can see that shifting at 7000 is the more favorable option. If you shift at 6500 youll be missing half of that nice power hump you can see from ~6k to 7k.

Torque is only one aspect of driving force, 200lb ft of torque at 2500rpm is a lot different than 200lb ft at 5000rpm, and thats why we invented horsepower as a power measurement. Because 200lb ft at 5000rpm is generating a lot more driving force than 200lb ft at 2500, power is king.

 

[robmustang201528]

Thanks alot for u help. So i should b shifting at 7000 even though it looks like I'm losing power after 6500 rpm according to graph? 7000 from 1st gear to 5th 7000?

 

[Walt1120]

Thanks alot for u help. So i should b shifting at 7000 even though it looks like I'm losing power after 6500 rpm according to graph? 7000 from 1st gear to 5th 7000?

Yeah thats where id shift. Think about it, just becaue power drops off doesnt mean its less power than youd have if you shift. Depending on gear the rpm drop between gears is like 1200-2000rpm. That why I was kinda using the 1500rpm as the example.

HP at 5000 = 365whp
HP at 5500 = 395whp
HP at 6000 = 410whp
HP at 6500 = 430whp
HP at 7000 = 405whp

Again just think about it, its not any crazy math or anything, you just need to visualize where the rpms fall to when shifting at different points. If you shift at 6500 and your rpm fall to 5000, youll go from 430 to 365 whp and if you shift at 7000, your rpm would fall to 5500 which is ~395whp. Since your still making more power at 7000 than you are at 5000 or 5500, theres no point in shifting earlier and letting the rpms fall down more. Your making the most power from ~6000 to ~7000 so you want to stay in the range for as much time as you can.

 

[robmustang201528]

Damn. Makes alot of sense. Thanks alot. I was just playing around on the street tonight. I hit 117 mph in 4th gear at 7000. And I was shifting short 1st-3rd 6600 6700 then when I got to 4th 7000. I'm gonna try shifting at 7 through each gear next time. 1st gear spun, 2nd gear spun even worse, 3rd gear chirp then all the way to 4th

 

[Tim Hilliard]

As others said from your graph you want your shift point to drop you in the sweet spot at each gear change. By the graph it looks like 5500-6000 is the target, healthy torque to recover lost momentum from the shift which will pull the car up the HP peak. You don't want to shift to early because then it's low momentum torque and the engine needs to recover that speed loss. Basically like everyone said rev that bitch out right before it noses over.

 

[socalsnake]

Of course practice makes perfect as well.

The faster you can shift, the smaller rpm drop you'll experience.

Lots of youtube videos showing how experienced drivers shift quickly. You should have an idea of what quick shifting looks like.

Something like...
[ame="[MEDIA=youtube]ZUOZ9xDWFX8[/MEDIA]"]

I don't think I can shift that quick on consistent basis...there's just no safe way to do that on public roads if you're pulling all the way to redline. For practice, you can short shift all day though.

 

[Walt1120]

Of course practice makes perfect as well.

The faster you can shift, the smaller rpm drop you'll experience.

Lots of youtube videos showing how experienced drivers shift quickly. You should have an idea of what quick shifting looks like.

Something like...


I don't think I can shift that quick on consistent basis...there's just no safe way to do that on public roads if you're pulling all the way to redline. For practice, you can short shift all day though.

I wish I wasnt scared to powershift the mt82, plus when you hit fuel cut on this car its like someone pulled the damn e-stop lol. I need a wot box or something, one that comes with a real 2 step too. The launch control is just a wheel hop party on the street, I get way better launches without it

 

[dubster99]

Is he geared differently than you?

 

[robmustang201528]

Nope 3:73

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