Are these guys good or what. Thanks Ron Parker
It Aint Over Until I Win
| Slant Six Forum https://www.slantsix.org/forum/ |
|
| Calculating RPM and Speed https://www.slantsix.org/forum/viewtopic.php?t=20744 |
Page 1 of 1 |
| Author: | Bren67Cuda904 [ Tue Nov 14, 2006 9:11 am ] |
| Post subject: | Calculating RPM and Speed |
I have found an online calculator that will figure engine RPM based on tire size, rear gear, trans ratio, and speed. For example 60MPH with 3rd gear (1:1), a rear gear of 3.55:1 and a 26 inch tall tire yeilds 2753 RPM. I am usuming that this calculator does not take in to account for torque converter slipage. How much slipage would you think there is? I don't want to cruise with an RPM over 3000. |
|
| Author: | slantzilla [ Tue Nov 14, 2006 9:13 am ] |
| Post subject: | |
That would depend on what converter you use and what it actually stalls at in your car. |
|
| Author: | Bren67Cuda904 [ Tue Nov 14, 2006 10:04 am ] |
| Post subject: | |
Lets say it's a stock 2000 stall converter. And lets say its an aftermarket 2800 stall converter. Also if I have a lockup style 904 are there lockup aftermarket converters and do they lockup? I have heard about converters for lockup type trans that don't lockup. |
|
| Author: | emsvitil [ Tue Nov 14, 2006 1:30 pm ] |
| Post subject: | |
I have an old DeskTop Drag Program and it assumes the following slip percentages for various stall speeds: 1200 3% 1800 4% 2500 5% 3500 6% 4000 7% 4500 7% 5000 7% |
|
| Author: | Dart270 [ Tue Nov 14, 2006 1:31 pm ] |
| Post subject: | |
At 2800 RPM, I would guess the 2000 stall converter would slip 5-8% and the 2800 stall would slip maybe 9-12%. Lou |
|
| Author: | Bren67Cuda904 [ Thu Nov 16, 2006 9:10 am ] |
| Post subject: | |
Also if I have a lockup style 904 are there lockup aftermarket converters and do they lockup? I have heard about converters for lockup type trans that don't lockup. |
|
| Author: | Joshie225 [ Thu Nov 16, 2006 9:56 am ] |
| Post subject: | |
Don't forget that the rear axle ratio will affect converter slippage. A lower (numerical) axle ratio will require more torque for a given road load (less RPM requires more torque for the same horsepower) increasing slippage. The lower RPM also put the converter into a less efficient and more slip and heat producing operating range. This is why you do not want to have a cruise RPM below the stall speed of the converter. You end up putting a ton of heat into the fluid. That heat is just wasted fuel and if the trans cooler is insufficient, a wasted transmission. One more thing. Smaller converters are more efficient at high stall speeds than large ones. |
|
| Author: | Ron Parker [ Fri Nov 17, 2006 5:45 pm ] |
| Post subject: | |
Are these guys good or what. Thanks Ron Parker It Aint Over Until I Win |
|
| Author: | Bren67Cuda904 [ Fri Nov 17, 2006 5:55 pm ] |
| Post subject: | |
Also if I have a lockup style 904 are there lockup aftermarket converters and do they lockup? |
|
| Author: | Joshie225 [ Sat Nov 18, 2006 9:04 am ] |
| Post subject: | |
Yes, you can get high stall lockup converters. They are more money of course. Google is your friend. |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|