Gasdoc's ERA build - #813

[blykins]

With a 26" tire, should be 2000 rpm at 55, 2200 rpm at 60 mph, 2600 at 70.

[DWRAT]

Originally Posted by blykins

With a 26" tire, should be 2000 rpm at 55, 2200 rpm at 60 mph, 2600 at 70.

2800 at the posted speed limit here in AZ 75.
3000 at 80
3200 at 85 which is the traffic flow in my area on open roads.

Those rpm's in a big block for 1-2 hours at a time, no thank you.

If your not planning trips like we do here in AZ you will love the .82.

[DanEC]

It sounds well planned out and very well equipped. I'm not a fan of deep OD ratios but then I have a Toploader. I don't recall the TKO600 first gear ration, but you might take a look at a 3.31 rear with the .82 OD and see if it's an option for a little more relaxed cruising with a gear box with 5 close ratios.

I would get the HD radiator for peace of mind.

Have fun

[blykins]

Alan and I are within 45 minutes of each other, so we're used to the same roads. If we drive 80-85, more than likely we'll end up in jail.

Alan lives in an area where most posted speed limits are 55. Interstates are 70. I would rather have a 2500-2600 rpm engine at 70 than to have a little bucking action at 55-60.

If he went to a .64, 70 mph rpms would be lower, but more than likely he would have to run in 4th gear at most other speeds driving around town.

This is a good reason to get a lot of data on an initial build. Every customer's driving situation is a little different.

[kevins2]

Originally Posted by blykins

If he went to a .64, 70 mph rpms would be lower, but more than likely he would have to run in 4th gear at most other speeds driving around town.

I have an ERA with 3.54 rear and .64 5th gear. Anything less than 50 mph in 5th is lugging the engine, and even at 50 a hill needs a downshift, so Brent's point is correct. I do a lot of driving on back roads with speed limits of 45 or 50. Whenever there's a car in front of me I have to run in 4th. That said, on open roads, it is very nice to be cruising along at 60 with the engine below 2000 RPMs. So, it is just a matter of what you want - one of life's many trade offs.

Gasdoc, well appointed car! You'll love it.

Kevin

[RodKnock]

Originally Posted by blykins

Alan and I are within 45 minutes of each other, so we're used to the same roads. If we drive 80-85, more than likely we'll end up in jail.

Alan lives in an area where most posted speed limits are 55. Interstates are 70. I would rather have a 2500-2600 rpm engine at 70 than to have a little bucking action at 55-60.

If he went to a .64, 70 mph rpms would be lower, but more than likely he would have to run in 4th gear at most other speeds driving around town.

This is a good reason to get a lot of data on an initial build. Every customer's driving situation is a little different.

I agree 100%. I have a 3.42 diff with the 0.82 5th gear and it's perfect for the SF Bay Area.