October Trivia Question 2 - Page 2

Black01 · 10-17-2004, 05:18 PM

2564.6675159235665

woot

math powa!

03BullittClone · 10-18-2004, 07:29 AM

Quote:

Originally Posted by ChrisXoxide

I get a kick out of everyone here posting up answers, corrections, etc etc. I'll be on later to declare the winner. I don't know for sure the answer until I get home. If I were to guess myself I'd say (without a calculator on hand) somehwere around 2700.

Make sure not to actually EDIT your post or it won't count.

How we doin'?

decoy562 · 10-18-2004, 08:22 AM

2696.6234472782

TayWolf55 · 10-18-2004, 02:00 PM

I know Chris saw this thread... are we all wrong? lol

Mustang Tuning · 10-18-2004, 03:14 PM

Shh...It's a trick question.

*madmatt* · 10-18-2004, 03:21 PM

AH! Maybe the answer is "within 25 RPMS"... Oh man that would rule. Thats my new guess.

Mustang Tuning · 10-18-2004, 03:28 PM

Now that would be funny. Mean...but funny.

TayWolf55 · 10-18-2004, 03:30 PM

I'm changing my guess to "within 25 RPMS"

*madmatt* · 10-18-2004, 03:35 PM

HAHA too bad I already guessed it lol.

TayWolf55 · 10-18-2004, 04:25 PM

Quote:

Originally Posted by madmatt

HAHA too bad I already guessed it lol.

Quote:

Originally Posted by Chris from last Contest

Trick question? hahah, no! Why would I intentionally try to trick you?! Putting some ideas in my head though =D

You said... "maybe"

plus you already won once. Your out of the running.

*madmatt* · 10-18-2004, 04:52 PM

Am I really, lol never read that...oh its mine lol.

GreyGhost · 10-18-2004, 05:46 PM

2496.7557592713847

bshiek · 10-18-2004, 07:14 PM

Quote:

Originally Posted by ChrisXoxide

At 75MPH in 5th gear, on stock 17 inch wheels and tires, a GT with a TR3650 transmission is at what RPM - with 4.10 rear gears? First to guess within 25 RPMs.

Hey, are we talking about a Ford GT?

They don't have stock 17 inchers -- they are 18s.

Ok, they don't run a 3650 either.

ChrisXoxide · 10-19-2004, 01:22 AM

At 75 miles per hour in 5th gear, your motor is turning at 2,495.4 RPM

BAM. Who wins here? I'm almost sure this is EXACT.

ChrisXoxide · 10-19-2004, 01:27 AM

Ok... looks like 03BullittClone, I think he was the first to officially post his RPM though, correct? 03BullittClone, PM me man, we will work things out.

03BullittClone · 10-19-2004, 06:00 AM

Quote:

Originally Posted by ChrisXoxide

Ok... looks like 03BullittClone, I think he was the first to officially post his RPM though, correct? 03BullittClone, PM me man, we will work things out.

SLP catted X, come to papa!

bshiek · 10-19-2004, 06:10 AM

Congrats, Clone!

Chris, can you provide the details on how you calculated that? -- turn this into a tech thread.

Many of us could use the lesson.

03BullittClone · 10-19-2004, 06:29 AM

Quote:

Originally Posted by bshiek

Congrats, Clone!

Chris, can you provide the details on how you calculated that? -- turn this into a tech thread.

Many of us could use the lesson.

I applied an old hot rodders rule of thumb, updated for 5-speeds. See Modular Tech Forum, thread "Choosing Gears". However, I would also be interested in the formal calculation, if it can be provided. Speaking for myself, I know the advent of sophisticated computer programs have generally made me "math lazy".

Black01 · 10-19-2004, 08:49 AM

Quote:

Originally Posted by 03BullittClone

I applied an old hot rodders rule of thumb, updated for 5-speeds. See Modular Tech Forum, thread "Choosing Gears". However, I would also be interested in the formal calculation, if it can be provided. Speaking for myself, I know the advent of sophisticated computer programs have generally made me "math lazy".

theres online calcs that you type all the ratios in and the speed, the only varation would be the tire size, i went out and measured my tires to get the size, i guess it wasent right, congrats man!

bshiek · 10-19-2004, 09:27 AM

I used the engine speed calculator from Modular Depot, and I haven't figured out what I missed yet. Somebody please show me the light. Thanks!

http://www.modulardepot.com/engine_speed.xls

Basically,

diameter = section/25.4*aspectratio*2/100+wheel

rpm = gear*transratio*75*336/diameter

For example:

gear = 4.10
transratio = 0.67
speed = 75

Tire diameter:
section = 245
aspectratio = 45
wheel = 17

diameter = 245/25.4*45*2/100+17
rpm = 4.10*0.67*75*336/25.68

I must have missed the diameter too!

ChrisXoxide · 10-19-2004, 10:49 AM

http://www.tchracing.com/tech/gearca...selectedgear=1

Quote:

Originally Posted by bshiek

I used the engine speed calculator from Modular Depot, and I haven't figured out what I missed yet. Somebody please show me the light. Thanks!

http://www.modulardepot.com/engine_speed.xls

Basically,

diameter = section/25.4*aspectratio*2/100+wheel

rpm = gear*transratio*75*336/diameter

For example:

gear = 4.10
transratio = 0.67
speed = 75

Tire diameter:
section = 245
aspectratio = 45
wheel = 17

diameter = 245/25.4*45*2/100+17
rpm = 4.10*0.67*75*336/25.68

I must have missed the diameter too!

bshiek · 10-19-2004, 11:36 AM

Thanks, Chris! I am curious which transmission ratio that calculator uses. Maybe I'll email them about it. Another calculator that is referred to on the tchracing forums is at http://www.f-body.org/gears/. This one shows the RPMs at 2700.

I want to see the actual calculation and tranny ratios so that I can estimate my trap speeds in the future. Plus the logic interests me.

bshiek · 10-19-2004, 12:00 PM

Here is another calculator that outputs conflicting numbers...at least when I use 0.67 for a tranny ratio.
http://www.allfordmustangs.com/Detailed/608.shtml

At this point this isn't about the contest, but I do want people to use the right calculations when they're deciding on gears and such. This is my research (dunno if it would be considered tech yet) contribution to this board.

ChrisXoxide · 10-19-2004, 12:01 PM

Quote:

Originally Posted by bshiek

Here is another calculator that outputs conflicting numbers...at least when I use 0.67 for a tranny ratio.
http://www.allfordmustangs.com/Detailed/608.shtml

At this point this isn't about the contest, but I do want people to use the right calculations when they're deciding on gears and such. This is my research (dunno if it would be considered tech yet) contribution to this board.

TR3650 is .62 5th gear though?

Black01 · 10-19-2004, 12:32 PM

Quote:

Originally Posted by ChrisXoxide

TR3650 is .62 5th gear though?

thought it was .62? what is the tire size?

bshiek · 10-19-2004, 12:32 PM

Quote:

Originally Posted by ChrisXoxide

TR3650 is .62 5th gear though?

Here is what

10-17-2004, 05:18 PM	#31 (permalink)
Black01 Poor College Kid Join Date: Sep 2004 Location: Michigan Posts: 55	2564.6675159235665 woot math powa! __________________ 2001 Black Mustang V6 Manual Steeda Tri-Ax True Dual Exhaust The mod bug is owning me

10-18-2004, 08:22 AM	#33 (permalink)
decoy562 Registered Loser Join Date: Sep 2004 Location: Acworth, GA Posts: 28	2696.6234472782 __________________ 2003 True Blue GT: Steeda Tri-Ax, Magnaflow Catback, K&N filter 1993 Ford Thunderbird: "Beater Car"

10-18-2004, 02:00 PM	#34 (permalink)
TayWolf55 Senior Member Join Date: Sep 2004 Location: Ozark, MO Posts: 597	I know Chris saw this thread... are we all wrong? lol __________________ 2004 Mustang GT 5 Speed Mac O/R H Pipe Mac Flowpath Catback JLT Ram Air Intake SCT XCal 2 Tuner FRPP 4.10 Gears 13.191 @ 103.78

10-18-2004, 03:14 PM	#35 (permalink)
Mustang Tuning Mustang Tuning Sales Manager Join Date: Sep 2004 Location: Newtown Square, PA Posts: 116	Shh...It's a trick question. __________________ 2001 Performance Red SVT Cobra Best E.T. 13.383 @ 107.49 miles per hour Bob MustangTuning.com

10-18-2004, 03:21 PM	#36 (permalink)
madmatt Traitor...lol Join Date: Sep 2004 Location: Lexington, SC Posts: 7,922	AH! Maybe the answer is "within 25 RPMS"... Oh man that would rule. Thats my new guess. __________________ RPMPlanets

10-18-2004, 03:28 PM	#37 (permalink)
Mustang Tuning Mustang Tuning Sales Manager Join Date: Sep 2004 Location: Newtown Square, PA Posts: 116	Now that would be funny. Mean...but funny. __________________ 2001 Performance Red SVT Cobra Best E.T. 13.383 @ 107.49 miles per hour Bob MustangTuning.com

10-18-2004, 03:30 PM	#38 (permalink)
TayWolf55 Senior Member Join Date: Sep 2004 Location: Ozark, MO Posts: 597	I'm changing my guess to "within 25 RPMS" __________________ 2004 Mustang GT 5 Speed Mac O/R H Pipe Mac Flowpath Catback JLT Ram Air Intake SCT XCal 2 Tuner FRPP 4.10 Gears 13.191 @ 103.78

10-18-2004, 03:35 PM	#39 (permalink)
madmatt Traitor...lol Join Date: Sep 2004 Location: Lexington, SC Posts: 7,922	HAHA too bad I already guessed it lol. __________________ RPMPlanets

10-18-2004, 04:52 PM	#41 (permalink)
madmatt Traitor...lol Join Date: Sep 2004 Location: Lexington, SC Posts: 7,922	Am I really, lol never read that...oh its mine lol. __________________ RPMPlanets

10-18-2004, 05:46 PM	#42 (permalink)
GreyGhost Junior Member Join Date: Oct 2004 Posts: 3	really really too late 2496.7557592713847

10-19-2004, 01:22 AM	#44 (permalink)
ChrisXoxide Senior Member Join Date: Sep 2004 Posts: 175	At 75 miles per hour in 5th gear, your motor is turning at 2,495.4 RPM BAM. Who wins here? I'm almost sure this is EXACT.

10-19-2004, 01:27 AM	#45 (permalink)
ChrisXoxide Senior Member Join Date: Sep 2004 Posts: 175	Ok... looks like 03BullittClone, I think he was the first to officially post his RPM though, correct? 03BullittClone, PM me man, we will work things out.

10-19-2004, 06:10 AM	#47 (permalink)
bshiek Member Join Date: Sep 2004 Location: Minnesota Posts: 99	Congrats, Clone! Chris, can you provide the details on how you calculated that? -- turn this into a tech thread. Many of us could use the lesson. __________________ 02 GT 5 spd

10-19-2004, 09:27 AM	#50 (permalink)
bshiek Member Join Date: Sep 2004 Location: Minnesota Posts: 99	I used the engine speed calculator from Modular Depot, and I haven't figured out what I missed yet. Somebody please show me the light. Thanks! http://www.modulardepot.com/engine_speed.xls Basically, diameter = section/25.4aspectratio2/100+wheel rpm = geartransratio75336/diameter For example:* gear = 4.10 transratio = 0.67 speed = 75 Tire diameter: section = 245 aspectratio = 45 wheel = 17 diameter = 245/25.4452/100+17 rpm = 4.100.6775*336/25.68 I must have missed the diameter too! __________________ 02 GT 5 spd

10-19-2004, 11:36 AM	#52 (permalink)
bshiek Member Join Date: Sep 2004 Location: Minnesota Posts: 99	Thanks, Chris! I am curious which transmission ratio that calculator uses. Maybe I'll email them about it. Another calculator that is referred to on the tchracing forums is at http://www.f-body.org/gears/. This one shows the RPMs at 2700. I want to see the actual calculation and tranny ratios so that I can estimate my trap speeds in the future. Plus the logic interests me. __________________ 02 GT 5 spd

10-19-2004, 12:00 PM	#53 (permalink)
bshiek Member Join Date: Sep 2004 Location: Minnesota Posts: 99	Here is another calculator that outputs conflicting numbers...at least when I use 0.67 for a tranny ratio. http://www.allfordmustangs.com/Detailed/608.shtml At this point this isn't about the contest, but I do want people to use the right calculations when they're deciding on gears and such. This is my research (dunno if it would be considered tech yet) contribution to this board. __________________ 02 GT 5 spd