View Poll Results: Where do you shift your 996 3.6L street engine'd racer
shift at redline to maximize HP and acceleration on any straight
13
36.11%
shift at 300rpm below redline to save then engine and its "noise" anyway.
11
30.56%
I dont know, but want to learn how to maximize acceleration on any straight on the track.
1
2.78%
I dont know and dont care. Ill just do whatever VR says I should do.
11
30.56%
Multiple Choice Poll. Voters: 36. You may not vote on this poll
996 3.6L street engine race car owners. Where do you shift?
02-08-2011, 09:09 PM
#1
Rennlist Member
Thread Starter
996 3.6L street engine race car owners. Where do you shift?
If you have a street powered 996 3.6L engine, where do you think its best to be shifted at, for maximum acceleration down a straight at a track near you.
as we all know, the gear spacing for 3-4th is an RPM that ends up 80% post shift RPM, and from 4-5th, 85% of that pre shifted RPM.
There is some thought, and even some lap time data that shows that the 996 engine, makes just a bunch of "noise" up top and its better to short shift by 300rpm. what do you think?? HP is generally flat up top, as torque flat and is falling as soon as 6000rpm.
There is a guy named Newton that would disagree with this technique, given that the 996 hp curve is fairly flat up top and produces more HP to redline than post shift, even in 4-5th and especially 3-4th
What do you think and do at the track?
as we all know, the gear spacing for 3-4th is an RPM that ends up 80% post shift RPM, and from 4-5th, 85% of that pre shifted RPM.
There is some thought, and even some lap time data that shows that the 996 engine, makes just a bunch of "noise" up top and its better to short shift by 300rpm. what do you think?? HP is generally flat up top, as torque flat and is falling as soon as 6000rpm.
There is a guy named Newton that would disagree with this technique, given that the 996 hp curve is fairly flat up top and produces more HP to redline than post shift, even in 4-5th and especially 3-4th
What do you think and do at the track?
02-08-2011, 10:49 PM
#3
Three Wheelin'
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If anybody actually cares PM/email me an actual dynojet file and gear ratios and I'll figure it out.
I'll give a little crumb to Kibort here, do I want to calculate wheel trq or hp?
I'll give a little crumb to Kibort here, do I want to calculate wheel trq or hp?
02-08-2011, 11:25 PM
#4
Greg,
Based on the article I posted in that other "Kiborted" thread, you want to "shift to maximize transmission output torque".
Here is the article link again:
http://www.allpar.com/eek/hp-vs-torque.html
Scott
Based on the article I posted in that other "Kiborted" thread, you want to "shift to maximize transmission output torque".
Here is the article link again:
http://www.allpar.com/eek/hp-vs-torque.html
Scott
02-09-2011, 04:22 AM
#6
Rennlist Member
Thread Starter
You know that wheel torque (after the transmission) and HP tell the same story at ANY vehicle speed. 
So, either one will work. I have no preference.
HP is just easier to work with. less to calculate to find performance maximization. maximize HP, you maximize rear wheel torque!
There really is nothing to figure out. just get the gear shift spacing and plot it on the HP curve. if the post shift RPM hp is the same, then you shift generally.
So, either one will work. I have no preference.HP is just easier to work with. less to calculate to find performance maximization. maximize HP, you maximize rear wheel torque!
There really is nothing to figure out. just get the gear shift spacing and plot it on the HP curve. if the post shift RPM hp is the same, then you shift generally.
02-09-2011, 04:26 AM
#7
Rennlist Member
Thread Starter
Greg,
Based on the article I posted in that other "Kiborted" thread, you want to "shift to maximize transmission output torque".
Here is the article link again:
http://www.allpar.com/eek/hp-vs-torque.html
Scott
Based on the article I posted in that other "Kiborted" thread, you want to "shift to maximize transmission output torque".
Here is the article link again:
http://www.allpar.com/eek/hp-vs-torque.html
Scott
I think the masses appreciate someone that questions authority and helps to find solutions. IF I help one interested sole in figuring out that the "noise" up top in RPM is utter BS in most cases, it is all worth the critism. Im obviously not here for a popularity contest or I wouldnt be agreeing with butt dyno boy, VR and his posey. Im only here to show what is true and correct, and learn something myself.
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02-09-2011, 12:47 PM
#10
Rennlist Member
Thread Starter
Its kind of funny with you. you get it, obviously with the article you posted, yet you have an issue "discussing" it? I dont understand. what is hard to discuss, is a topic when facts are brought up and some just says your wrong.
If you dont want to discuss, you should just get a blog.
some of these guys take this stuff WAY to seriously. news flash, this is a forum, discusson board. Like guys at the track just talking, but its in priint.
nothing more, nothing less. BUT, its a great way to research, share information, and also have a little fun doing so.
anyway, the results are in. as I thought, there are some blind sheep.
If you dont want to discuss, you should just get a blog.
some of these guys take this stuff WAY to seriously. news flash, this is a forum, discusson board. Like guys at the track just talking, but its in priint.
nothing more, nothing less. BUT, its a great way to research, share information, and also have a little fun doing so.
anyway, the results are in. as I thought, there are some blind sheep.
02-09-2011, 12:48 PM
#11
The Penguin King
Rennlist Member
Rennlist Member
02-09-2011, 12:57 PM
#12
Rennlist Member
If you have a street powered 996 3.6L engine, where do you think its best to be shifted at, for maximum acceleration down a straight at a track near you.
as we all know, the gear spacing for 3-4th is an RPM that ends up 80% post shift RPM, and from 4-5th, 85% of that pre shifted RPM.
There is some thought, and even some lap time data that shows that the 996 engine, makes just a bunch of "noise" up top and its better to short shift by 300rpm. what do you think?? HP is generally flat up top, as torque flat and is falling as soon as 6000rpm.
as we all know, the gear spacing for 3-4th is an RPM that ends up 80% post shift RPM, and from 4-5th, 85% of that pre shifted RPM.
There is some thought, and even some lap time data that shows that the 996 engine, makes just a bunch of "noise" up top and its better to short shift by 300rpm. what do you think?? HP is generally flat up top, as torque flat and is falling as soon as 6000rpm.
i run it 5k-7k usually on a track, if it goes close to 4500 it feels pretty stall.
02-09-2011, 01:37 PM
#15
Rennlist Member
Thread Starter