1/4 Mile Time In A Manual

[Blown BA]

well tonight a few off the guys and I went to the drags we all had ishues with take offs I managed to run a 12.3 @121mph but the 60 foot time a bit slow 2.1 and now the clutch needs to be upgraded now

<{POST_SNAPBACK}>

Good work Bruce. The time will come down with more practice.

Brian

<{POST_SNAPBACK}>

I agree

[macka'sxr6t]

I am confused,

All we ever hear is get your car to the track. The MPH will tell us your real power by a certain individual and a couple of others.

I'm not having a shot at anyone but this is what is thrown up time and time again when you mention the word EMS.

Now we can have a car with 60 odd rwkw more than Geea and XRDreaming running the same MPH as them and its OK because its a manual.

As I said I'm not having a shot at anyone but I am a confused.

If MPH is the real power figure to go by not dyno readings I have a question for all you Physists.

What should the MPH be for a 390 rwkw car weighing 1800 kg over 400 meters?

Should be more than 121 mph would'nt it.

macka

[badxr6]

I am confused, 

All we ever hear is get your car to the track.  The MPH will tell us your real power by a certain individual and a couple of others.

I'm not having a shot at anyone but this is what is thrown up time and time again when you mention the word EMS.

Now we can have a car with 60 odd rwkw more than Geea and XRDreaming running the same MPH as them and its OK because its a manual.

As I said I'm not having a shot at anyone but I am a confused. 

If MPH is the real power figure to go by not dyno readings I have a question for all you Physists.

What should the MPH be for a 390 rwkw car weighing 1800 kg over 400 meters?

Should be more than 121 mph would'nt it.

macka

yes you would be correct if it was auto but a manual looses time with gear changes,on and off throttle. where the auto is on boost all the time and I dont care what anybody tells you this is the facts that's why a manual needs more power than a auto to get the same result and if you put a manual box in geea car it would show more power than it does now

[macka'sxr6t]

What should the MPH be for a 390 rwkw car weighing 1800 kg over 400 meters?

Should be more than 121 mph would'nt it.

macka

yes you would be correct if it was auto but a manual looses time with gear changes,on and off throttle. where the auto is on boost all the time and I dont care what anybody tells you this is the facts that's why a manual needs more power than a auto to get the same result and if you put a manual box in geea car it would show more power than it does now

<{POST_SNAPBACK}>

Bruce,

Auto's don't change with a WOT either the PCM controls torque etc and throttle position.

As I stated I am confused and in no why having a dig at anyone.

Because of this confusion I decided to do some searching on the net to find drag racing et & mph calculators to work it out for myself.

The results of which are very surprising.

Example XR6turbo wt = 1800kg approx = 3968 lb

This is the intersting part.

To get this mass from a standing start to a top speed of 119 in 1/4 of a mile you need 389.16 kw ET of 11.45 sec

Your speed through the trap verifies your dyno reading. Making allowances for the manual gearbox you are apprx .7 sec away from this time.

Now in reverse

Geea & XR tell us they have 330 rwkw approx =442.53 hp

with 442.53 hp with the wt mass of 3968 lb the top speed would be 112.63 mph ET of 12.1 sec

They have time slips verifying these explots

ET 11.6 120 mph. With the weight of the car this means that they would need much more hp than they state. Their cars would have to be producing 390 rwkw to produce these figures.

This would back up dynowogs reading of 394 rwkw a couple of months ago. And the 112 mph would back up pretzles car as having 300 + rwkw

Please don't take any offence Graig and Dean these are pure mathimatical facts

to seperate calculators where used so that I could verify that these were accurate calculations

makes you wonder about who's got how much power though does'nt it.

macka

[badxr6]

What should the MPH be for a 390 rwkw car weighing 1800 kg over 400 meters?

Should be more than 121 mph would'nt it.

macka

yes you would be correct if it was auto but a manual looses time with gear changes,on and off throttle. where the auto is on boost all the time and I dont care what anybody tells you this is the facts that's why a manual needs more power than a auto to get the same result and if you put a manual box in geea car it would show more power than it does now

Bruce,

Auto's don't change with a WOT either the PCM controls torque etc and throttle position.

As I stated I am confused and in no why having a dig at anyone.

Because of this confusion I decided to do some searching on the net to find drag racing et & mph calculators to work it out for myself.

The results of which are very surprising.

Example XR6turbo wt = 1800kg approx = 3968 lb

This is the intersting part.

To get this mass from a standing start to a top speed of 119 in 1/4 of a mile you need 389.16 kw ET of 11.45 sec

Your speed through the trap verifies your dyno reading. Making allowances for the manual gearbox you are apprx .7 sec away from this time.

Now in reverse

Geea & XR tell us they have 330 rwkw approx =442.53 hp

with 442.53 hp with the wt mass of 3968 lb the top speed would be 112.63 mph ET of 12.1 sec

They have time slips verifying these explots

ET 11.6 120 mph. With the weight of the car this means that they would need much more hp than they state. Their cars would have to be producing 390 rwkw to produce these figures.

This would back up dynowogs reading of 394 rwkw a couple of months ago. And the 112 mph would back up pretzles car as having 300 + rwkw

Please don't take any offence Graig and Dean these are pure mathimatical facts

to seperate calculators where used so that I could verify that these were accurate calculations

makes you wonder about who's got how much power though does'nt it.

macka

intesting data and so true and no offence taken. as your figures state I did estermate I should of ran 11.6 if I hade of got the 60 foot down to 1.8 on the night it would of been right.the track here on a street drag night is prety sh** for tracksion not like the night geea came over it was a comp cars night and the track was killa as I did a 1.91 most runs.it was frustrating the other night when I couldnt repeat it when I thought it would of been easier with more grunt

[Lawsy]

Good post macka, but I don't think its that simple. One thing though, pretzel had major clutch slippage off the line and in the 2nd to 3rd shift. He probably would have lost a good 5mph from this.

But anyway.....

[macka'sxr6t]

As I said these figures back your stated rwkw.

It also backs DW claims

It does'nt look so good for Graig and Dean's claimed power figures.

These guy's are the bench mark we are all chasing.

I did not intentionately try to prove anyone right or wrong I was just tring to work out how much power I would need to get my lump of tin to do 120mph and join these guy's in the 11 sec club.

At only 300 rwkw it will not be enough by the look of it.

macka

[macka'sxr6t]

Good post macka, but I don't think its that simple. One thing though, pretzel had major clutch slippage off the line and in the 2nd to 3rd shift. He probably would have lost a good 5mph from this.

But anyway.....

<{POST_SNAPBACK}>

Lawsy,

I believe it is that simple. Peter says the track is the true test of power. It's simply mass and energy to propel that mass to a given speed in a certain distance give or take a fewweather varables

your involved with engineering so you no that mathematics don't lie :lol:

macka

[Guest]

What should the MPH be for a 390 rwkw car weighing 1800 kg over 400 meters?

Should be more than 121 mph would'nt it.

macka

yes you would be correct if it was auto but a manual looses time with gear changes,on and off throttle. where the auto is on boost all the time and I dont care what anybody tells you this is the facts that's why a manual needs more power than a auto to get the same result and if you put a manual box in geea car it would show more power than it does now

<{POST_SNAPBACK}>

Bruce,

Auto's don't change with a WOT either the PCM controls torque etc and throttle position.

As I stated I am confused and in no why having a dig at anyone.

Because of this confusion I decided to do some searching on the net to find drag racing et & mph calculators to work it out for myself.

The results of which are very surprising.

Example XR6turbo wt = 1800kg approx = 3968 lb

This is the intersting part.

To get this mass from a standing start to a top speed of 119 in 1/4 of a mile you need 389.16 kw ET of 11.45 sec

Your speed through the trap verifies your dyno reading. Making allowances for the manual gearbox you are apprx .7 sec away from this time.

Now in reverse

Geea & XR tell us they have 330 rwkw approx =442.53 hp

with 442.53 hp with the wt mass of 3968 lb the top speed would be 112.63 mph ET of 12.1 sec

They have time slips verifying these explots

ET 11.6 120 mph. With the weight of the car this means that they would need much more hp than they state. Their cars would have to be producing 390 rwkw to produce these figures.

This would back up dynowogs reading of 394 rwkw a couple of months ago. And the 112 mph would back up pretzles car as having 300 + rwkw

Please don't take any offence Graig and Dean these are pure mathimatical facts

to seperate calculators where used so that I could verify that these were accurate calculations

makes you wonder about who's got how much power though does'nt it.

macka

<{POST_SNAPBACK}>

intesting data and so true and no offence taken. as your figures state I did estermate I should of ran 11.6 if I hade of got the 60 foot down to 1.8 on the night it would of been right.the track here on a street drag night is prety sh** for tracksion not like the night geea came over it was a comp cars night and the track was killa as I did a 1.91 most runs.it was frustrating the other night when I couldnt repeat it when I thought it would of been easier with more grunt

<{POST_SNAPBACK}>

this may be true macka but they will find something ti winge about!

[F6 UTE]

I used the Ray Hall drag calculator and it reckons u need 500Hp ( 373KW ) to run 120mph and should have an ET of 11.37 odd with 3900 Lb.

doesn't add up in the real world though..