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Old 12-06-2006, 02:01 AM   #1
strongboy2005
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Default What RPM do you shift?

You're at the track in your 1994 saturn sc2. Your only mod is a cold air intake. What RPM do you shift at in each gear?

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Old 12-06-2006, 02:05 AM   #2
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Default Re: What RPM do you shift?

Drive hard. Shift right before you absolutely need to. Just try not to redline alot. You should know when to shift by the sound of the car, not the RPM's.

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Old 12-06-2006, 02:44 AM   #3
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Default Re: What RPM do you shift?

From what others have said, 6500 sounds like the magic number for upshifting, puts you right in the peak hp. Down shifting is a little less, because then it puts you at max torque.

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Old 12-06-2006, 09:52 AM   #4
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Default Re: What RPM do you shift?

Quote:
Originally Posted by strongboy2005 View Post
You're at the track in your 1994 saturn sc2. Your only mod is a cold air intake. What RPM do you shift at in each gear?
well, you gotta get as close to the rev-limiter as possible without touching it. if you hit it, it will slow you down, but if you shift too far before it, you'll be missing a few revs. i usually go right to the tip of the redline and shift in competition. maintaining your vehicle takes on a new and special meaning when you do this often...


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Old 12-06-2006, 10:51 AM   #5
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Default Re: What RPM do you shift?

The rev limiter is set a 6750, but if you shift there, you already passed peak HP. Peak is right around 65-6600.

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Old 12-06-2006, 07:13 PM   #6
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Default Re: What RPM do you shift?

Isn't peak more in the 5500 range?

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Old 12-06-2006, 09:07 PM   #7
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Checkered Flag Re: What RPM do you shift?

Quote:
Originally Posted by strongboy2005 View Post
You're at the track in your 1994 saturn sc2. Your only mod is a cold air intake. What RPM do you shift at in each gear?
up-shift at 6500 RPM. make sure you shift before hitting the 6750 -/+ 150 RPM fuel shut off.

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Old 12-06-2006, 10:13 PM   #8
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Default Re: What RPM do you shift?

The valves in our cars will fall off the map right after 6500.


So shift right then, if not right before it.

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Old 12-06-2006, 10:35 PM   #9
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Default Re: What RPM do you shift?

How often do people drive up to the limiter. I shift a between 3500 and 4500 in normal driving. For racing, I do up it to 6500. Because I drive hard all them time, I started running semi-synthetic.

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Old 12-07-2006, 01:34 AM   #10
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Default Re: What RPM do you shift?

Shift around 6600-6700rpm. Remember, no granny shifting would you should be double clutching.

Around town, I shift 2500-3000rpm.

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Old 12-07-2006, 05:49 AM   #11
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Default Re: What RPM do you shift?

Quote:
Originally Posted by 98greenSC2 View Post
Shift around 6600-6700rpm. Remember, no granny shifting would you should be double clutching.

Around town, I shift 2500-3000rpm.
yes u wernt double clutching like u should in that drag race

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Old 12-07-2006, 06:03 AM   #12
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Default Re: What RPM do you shift?

I agree with the top limit of 62...maybe 63 or so...beyond that, you're just turning the crank... but xupthree60? Why the d-clutch? When it's on, it's there... I thought....well... just a question.

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Old 12-07-2006, 06:19 AM   #13
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Default Re: What RPM do you shift?

Quote:
Originally Posted by Sir Trews View Post
I agree with the top limit of 62...maybe 63 or so...beyond that, you're just turning the crank... but xupthree60? Why the d-clutch? When it's on, it's there... I thought....well... just a question.
que??

i dunno what ur asking, i was just making fun of Dom (vin deisle)

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Old 12-07-2006, 08:53 AM   #14
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Default Re: What RPM do you shift?

Quote:
Originally Posted by colonelhogan44 View Post
Isn't peak more in the 5500 range?
IIRC, according to dyno tests, the peak torque is around 5000, but the peak HP isnt until later. This is all for the DOHC of course.

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Old 12-07-2006, 08:55 AM   #15
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Default Re: What RPM do you shift?

On the SOHC I shift between 4500-5000 RPM. Torque peak is 2400RPM. Never had the opportunity to drive a DOHC with a clutch in it - I'd probably shift around 6000RPM though.

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Old 12-07-2006, 12:07 PM   #16
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Default Re: What RPM do you shift?

yeah, the double clutch reference was a dig on "the fast and the furious". basically, anyone that knows anything about driving knows that you don't double clutch when you are upshifting. only downshifting and it's usually not necessary on modern cars or cars without a full race gearbox with no synchros. vin diesel wouldn't have sounded more ridiculous if he had told him he should have been heel/toe shifting during that race. that's another deceleration-only move...


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Old 12-07-2006, 12:19 PM   #17
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Default Re: What RPM do you shift?

I have an automatic. Shifts itself, freeing me up to drink coffee and scratch myself.

And double clutching is only used when a transmission has no syncronizers, like cars 60 years or more ago or some very old over the road trucks.

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Old 12-07-2006, 12:33 PM   #18
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Default Re: What RPM do you shift?

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I have an automatic. Shifts itself, freeing me up to drink coffee and scratch myself.

And double clutching is only used when a transmission has no syncronizers, like cars 60 years or more ago or some very old over the road trucks.
ah, yes, the auto tranny. gotta keep one hand free for the babes, right?

double clutch can also be used in conjunction with heel/toe downshifting when going from a very hi-rpm to a low gear (either 1st or 2nd). there's a point where the synchros are simply overwhelmed and do nothing. a properly timed double clutch will help in those situations...


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Old 12-07-2006, 05:44 PM   #19
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Default Re: What RPM do you shift?

Heel and toe driving is used for downshifting. When you are going into first or second while traveling at a high rate of speed. The idea is to get the engine moving to the same speed that the tires are moving so that there is little/no wear on the clutch pad itself. Granted it is MANDITORY when you are driving a car without syncros. However using it in a modern day car is not a bad idea.

Double clutching is used in a turbocharged car. The process is step on the clutch, put the car into nuetral, let the clutch off. Step on the clutch again and hit your gear. This is done in order for the engine to slow down. If you "slam" into your next gear while still maintaining those high RPM's, your tires will spin. When your tires spin, you don't have traction, when you don't have traction, you are not accelerating which in turn makes you slower. Double clutching lets the motor drop down in RPM's so that when you do get into gear your tires will have less chace of spinning.

For example: Rev your car to 3 grand and dump the clutch. That's just the same as "granny shifting" your force fed car. On the other hand, hold it at 1.5 and dump the clutch. You will spin a lot less here and that is your "double clutch".

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Old 12-07-2006, 05:55 PM   #20
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Default Re: What RPM do you shift?

Quote:
Originally Posted by nad View Post
Heel and toe driving is used for downshifting. When you are going into first or second while traveling at a high rate of speed. The idea is to get the engine moving to the same speed that the tires are moving so that there is little/no wear on the clutch pad itself. Granted it is MANDITORY when you are driving a car without syncros. However using it in a modern day car is not a bad idea.

Double clutching is used in a turbocharged car. The process is step on the clutch, put the car into nuetral, let the clutch off. Step on the clutch again and hit your gear. This is done in order for the engine to slow down. If you "slam" into your next gear while still maintaining those high RPM's, your tires will spin. When your tires spin, you don't have traction, when you don't have traction, you are not accelerating which in turn makes you slower. Double clutching lets the motor drop down in RPM's so that when you do get into gear your tires will have less chace of spinning.

For example: Rev your car to 3 grand and dump the clutch. That's just the same as "granny shifting" your force fed car. On the other hand, hold it at 1.5 and dump the clutch. You will spin a lot less here and that is your "double clutch".

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