RPM question..

[thunderchicken2]

I was just wondering what RPM you are running at say, 70mph, or at least what the range should be? I usually run 65-70 at 3k or a little more..it seems as if the car should have another gear though it doesn't. I was just wondering if this was normal? I know the car can go a lot faster, but when I do it sounds like the engine is working extremely hard and I don't want to damage anything..

[EDMUND65]

that sounds pretty much right... my car 5th gear 3grand 70mph

[steviek]

Yea that rpm is fine. I can't say for sure for automatics but sounds right. Also are engines are loud so don't worry too much. Do your automatics come with Overdrive if so you can lower rpm across the whole band with that on at the expense of performance

[Shpyder]

You are right, it does seem that the car should have another gear given regular highway cruising speeds, but I think most Mitsus are like that, except for the 6 speeds. 4-bangers are buzzy little motors anyway, and the final drive gear in your case sacrifices a comfortable cruise RPM for higher performance. Same thing on my 3000GT, I swear at 3000rpm I'm doing only 65 mph, as well as on my 4-banger Galant. Just just the gearing they came with. I'll be putting in a 16% taller 5th gear on my GT once the tranny goes out (hopefully not to soon).

[l_eclipse_l]

Just for reference, at 70 mph in 4th gear my car stays at about 2,500 rpm.

[Thor06]

Ha ha, shut up Chrysler boy . Just playing man. The 420a is mated to a Chrysler tranny isnt it?

I am considering getting the taller 5th gear for my Talon. Only thing is I dont want to need that gear in the 1/4 and have it too long to be in good power band. How fast would you be going in 4th around 7k? Granted I will be shifting past then but just for reference .

[XeVeNskyLiNE]

Originally Posted by l_eclipse_l

Just for reference, at 70 mph in 4th gear my car stays at about 2,500 rpm.

Really? I'm at the 3.5-4k range at that speed and gear.

[EDMUND65]

Originally Posted by XeVeNskyLiNE

Really? I'm at the 3.5-4k range at that speed and gear.

yea sound about correct but yea i'd ask about eclipses 2500 ...

[david-b]

In 5th, my needles are aligned perfectly. When on the highway, rpms and mph are pointed straight up. I could go for a 6th gear. Someone make one for me, ok? Thanks.

[l_eclipse_l]

Originally Posted by EDMUND65

yea sound about correct but yea i'd ask about eclipses 2500 ...

You guys want a picture? I will take one with my phone on the interstate. With the cruise set at 70 mph, rpm is at 2500 and I'm assuming it's in 4th since that's my final drive gear with the O/D on.

Originally Posted by Thor06

The 420a is mated to a Chrysler tranny isnt it?

I'm pretty sure it is.

[gthompson97]

Yes, the 420a is mated to a Chrylser tranny.

[ned032002]

I know that I drive a Ford but they didn't really use much common sense when they built these trannys. They made a shift point at regular cruising speed at about 32 mph, why would they do that? Just tryin to maintain normal speed in town makes the tranny constently shift up and down.

[LouieAWDTSi]

Doing 70 in over drive (4th gear), my car is at 3000 RPM. The needle on the RPM gauge looks like it says 2800-2900 but my s-afc reads 3000 rpm's. Sounds like the tranny is fine thunderchicken!

[LouieAWDTSi]

Originally Posted by ned032002

I know that I drive a Ford but they didn't really use much common sense when they built these trannys. They made a shift point at regular cruising speed at about 32 mph, why would they do that? Just tryin to maintain normal speed in town makes the tranny constently shift up and down.

Are you describing mitsu auto or ford when you say "these trannys"?

[thunderchicken2]

Thanks all, I was just curious :P I guess my mind still hasn't completely transferred from the 95 thunderbird to the DSM world. With that v8, I would run about 1700rpm at 70-75 .