Cudaken’s mph per rpm/rear axle gear ratio chart

[OldGuy]

Back when – either on the previous site or early on this site, Cudaken put together a layout detailing mph at various rpm's and rear axle gear ratios – I think he also had rear tire sizes mixed in with it.  did anyone keep a copy of that?  If so, could you post it up?  Thanks.

[Rolling_Thunder]

A member here made this...     same thing but alot more fun to play with 

http://vexer.com/68rt/speed.html

[terrible one]

A member here made this...     same thing but alot more fun to play with 

http://vexer.com/68rt/speed.html

VERY nice! Kudos to whoever did that!

[OldGuy]

A member here made this...     same thing but alot more fun to play with 

http://vexer.com/68rt/speed.html

Thunder -

Thanks.

[MOPARHOUND!]

Thanks!  Saved in the favorites.  Some old math I did told me I was shifting in the 5400-5600 range based on my speedometer (tach is way off), and the calculator proved that out.

[Charger_Fan]

Holy crapolee, that thing's COOL!!
There sure is a lot of difference in RPM's by changing 10" of tire height.

Did you notice the clock on the dash matches the time on your computer?

[PocketThunder]

Holy crapolee, that thing's COOL!!
There sure is a lot of difference in RPM's by changing 10" of tire height.

Did you notice the clock on the dash matches the time on your computer?

Did you read #3
"I've limited the tire diameter to 18" maximum size. I think 20+ inch wheels and tires look like puke on a classic muscle car so I'm not going to enable anybody wishing to perpepuate this travesty upon their car. Sorry!"

Good thing i only have 17's 

Also the tach needle bounces at idle below 1000 rpm 

[RECHRGD]

That thing is FUN to play with.  If I type in the final ratio of 2.76 that I have when the gear vendors is engaged it shows 5,964rpm at 180mph!!!!!  I don't think I'll try that in the real world however.   Bob

[suntech]

Mine will be 5334@ 200mph, and i WILL try it!!!

[RECHRGD]

Mine will be 5334@ 200mph, and i WILL try it!!!

GEEEEZE !!!! Watcha got?? 3 foot tall tires?

[0X01B8]

heh, glad you all like my program!  I think you're getting a bit reckless so I'm going to limit the revs to 2500 and the mph to 55.   

-john

[Rolling_Thunder]

4506rpm @ 200mph...                thats with my old 2.76 gears....           currently the 3.55's will put me at 4318rpm @ 149mph     

[The70RT]

Nice refference link. Thanks...saved it to my favorites too

That thing is FUN to play with.  If I type in the final ratio of 2.76 that I have when the gear vendors is engaged it shows 5,964rpm at 180mph!!!!!  I don't think I'll try that in the real world however.   Bob

Great link...no more calculating. Damn.....it would be nice to get a gear vendor unit.

Mine will be 5334@ 200mph, and i WILL try it!!!

Take the Bullitt move crash X 2..........

[suntech]

GEEEEZE !!!! Watcha got?? 3 foot tall tires?

No, 335/30- 18, 4.11 rearend, and 50% overdrive on 6th!!

[Charger_Fan]

Holy crapolee, that thing's COOL!!
There sure is a lot of difference in RPM's by changing 10" of tire height.

Did you notice the clock on the dash matches the time on your computer?

Did you read #3
"I've limited the tire diameter to 18" maximum size. I think 20+ inch wheels and tires look like puke on a classic muscle car so I'm not going to enable anybody wishing to perpepuate this travesty upon their car. Sorry!"

I didn't see that.

Thanks for making that 0X01B8, it's great! 
I hope ya don't mind, I had to share with the guys on a Ferd truck site I frequent.
http://fordtruk.com/forums/viewtopic.php?t=4158

[MOPARHOUND!]

This is insane, but this guy's Charger SRT-8 was running 170 MPH at 6240 RPM's : http://www.youtube.com/watch?v=Od6mHt1bHmI

He posts in the comments section.

He has a thread on http://www.chargerforums.com/forums/index.php , but I couldn't find it.

[Nacho-RT74]

just a question to 0X01B8... on your website are you taking in mind some of the torque converter slippage ?

[0X01B8]

just a question to 0X01B8... on your website are you taking in mind some of the torque converter slippage ?

No, and I have no idea how much that would be.   

[Nacho-RT74]

on moparts tech archive section is posted a file what somebody made on Excel... he did post 8%

dunno if info is for real. but I think is not a lineal proportion thorught RPMs increase, all depends of converter specs. So as "prograrmer" stated on file, is just an aprox

[0X01B8]

Okay, Nacho, here ya go!    I put in a control for torque converter efficiency.  Read note #2 on the page for the disclaimer.  BTW, can you send me the spreadsheet file from above, or tell me where to find it?  I'd like to try it out. 

[Nacho-RT74]

Okay, Nacho, here ya go!    I put in a control for torque converter efficiency.  Read note #2 on the page for the disclaimer.  BTW, can you send me the spreadsheet file from above, or tell me where to find it?  I'd like to try it out. 

http://www.moparts.com/Tech/tech/pages/speedo.html
click on XLS archives links and will download

[Nacho-RT74]

You know what ? I don't know where the XLS programer made to work the slippage value on table, because with your calculator at 100 % torque converter eficiency I read really close the same than the table where supposelly the programer added the 8% slippage.

I think that is really hard to tell with all torque converters variety on market. I think needs algoriths running on a Macro where you fill your torque converter stall