Does this sound right? Im usually a 3rd gen guy.

60mph @ 3400rpm 5th gear
70mph @ 4000rpm 5th gear

Let me know what you think!

JP

 

that seems pretty low mph for that high of rpms in fifth gear on a first gen or any 7

 

ITs not WOT its just cruzing

 

RX-Racer, Thats way high for a stock diff, (maybe not standard) cant do the math but cruising at 130km in 5th mine is about 3500.

Cheers Sue

 

Dude that's way low MPH for cruiseing. 4k should be 80mph, and 60 should be like just 3k

 

Alright, I just got the car. Im gonna most likely to pull the rear end out and check it out. It may
be a bigger gear or just out of wacked! Its also a little nosier that it should be. But thankz
for the quick replys guys! Muchly Appreciated!

JP

 

WOT has nothing to do with speed at a certain RPM. It's fixed based on your gear ratios and RPM. Anyway, those RPMs seem low to me...

FS

 

Got ya, I won't really know whats up until I open her up!

Fun stuff to do tommarow!

JP

 

I think the noise is a bearing!

 

I believe the GSL-SE (and rare GTU or whatevers) have 4:10 rear ends. The rest of us have 3:90. The noise is more that likely a bearing. I have a noise too. It's been going on over a year now and never got worse so I never bothered to fix it yet.

Wouldn't think it's rear end problem with the rpm-mph situation. Most likely, if you car is not running the right rpm's for mph, then it's a power issue with the motor.

All I can say about mine is that I can do this around 6-7k (before redline), never really payed that close attention but have been meaning to chart it all down...

1st-30(mph)
2nd-60
3rd-70
4th-90
5th-120?

 

On my GSL-SE, those numbers aren't too far off. If I recall correctly, it cruised at 80 mph at 4000 RPMS. I would usually go 70 to keep it below 3500.

 

Uh dude my 3rd is good for 90mph and my 4th is good for 110-115mph and my 5th 137 and counting. I have a stock rearend 3.90:1

 

what rpms?

 

This relationship will not be effected at all by how well the car is running (except if there is clutch slipage) or where the throttle is.

If the car is at higher revs for a given speed than is should be there are really on two possibilities.

1. extreme clutch slipage. You would notice this problem at other times than just cruising so I doubt that is it.

2. your gear ratio isn't what it was from the factory. This could be that you have different size (shorter in this case) tires or a different rear end gear ratio. These would cause you speedo to read too high.

It isn't very hard to figure out what it should be given a certain ratio and tire size.

 

correct i was going to say tha , but my fingers are tiard of typing...

 

1st-30(mph)
2nd-60
3rd-70
4th-90
5th-120?

You must have a shitty 3rd gear if you only get another 10 mph out of it. Maybe every other tooth is missing or something !?!

 

yea my 3rd is good for like 90 and well over 100 in 4th,
anyway my 85 GS does 4k rpms at 70 mph. How much speed is 5700 rpms?
Didn't Road & Track say the stock 12a 1st gen goes 122 mph in 4th and 5th gears.
Also how big is the difference in 175/70/R13 and the factory 185/70/R13. I have 175's so maybe that's why my rpms seem higher than all of you.

 

Uh I shift at 8k I think I pull about 4k at 70mph not exactly sure though. I know at the track my trap speed was 88.9 and I was pulling a few hundred shy of 8k and getting on the freewy is a 3rd gear affair I go straight the fast lane and pull 90mph before I go straight to 5th from 3rd lol.

 

if you are running 175 tires, your speedo is 6% off, however unless someone changed out your speedo gear in the tranny, your car can't tell the difference. I vote for clutch slippage if there is anything wrong at all.

 

I was simply going from memory. It's been awhile since I've drove it but I will make a point to take it out this weekend and write down what I get at 7k rpm.

The reason I said something might be wrong with the power of the engine is b/c I was assuming that if you were low on compression, the motor would have to work harder (highter rpms) to reach the same speed as a motor in A+ shape. Maybe that's an incorrect assumption, but it made since to me.

 

your assumption would have some validity in an automatic transmission car with a torque converter (allthough the converter should have already locked up pretty good at these speeds we're talking about)

with a manual transmission car, the speed the motor spins is ALWAYS a direct relation to speed depending on gear (and assuming no clutch slippage), for the motor to be turning higher rpms because it wasnt making enough power, he would simply have to be going faster, or have to downshift to 4th to bring the revs up to make more power.

 

Alright now, the more I think about it make sense to me know.

I guess I was just being stupid as to how it all comes together.

The motor is connected to the transmission (with clutch assembly) which would be doing the EXACT same rpms as the engine (common sense) Now, with the gears in the tranny, the rpms are reduced from the rpms of the motor through the reduction gear (1st, 2nd, 3rd, 4th, or 5th-all different ratios) then, whatever THAT rpm turns out to be is what the driveshaft is going to spin at which is then connected to the diff which is reduced by gears and then goes to the wheels. I wasn't looking at it this way before......

Guess that's why you don't wanna accidently go from doing 100mph in 5th and put it in like 1st or 2nd. The rpms would immediately go to like >10,000rpm eh? ...and your foot not even on the gas.

 

i didnt' feel like reading all of it, but here is my 2 cents.

the rpms seem kind of high for that mph.

i have the 85 12a tranny (which has higher gear ratio (5th)than the se tranny) and the se rear (4.09), maybe my speedo is off,

im thinking your speedo needs recalibrating. or you have the same setup as me and im wrong.

carl.

 

Maybe one of these days I will learn to just keep my mouth shut on here and let one of you guys do the advise giving...

To correct my previous statement, I took my seven out the day before Thanksgiving and made a point to watch my tach while driving it. Never got a chance to go faster than 80 where I was driving but here is what I got:

(All @ 7k rpm in a stock drive-train 83 GSL)
1st.....30mph
2nd....50mph
3rd.....80mph
4th.....100mph(close estimate)
5th......120mph(again, should be a close estimate)

Selfishly, I didn't think to check what rpms @ 60 and 70 were in 5th. If no one else posts it, I will next time I take the seven out.

 

I'm believin' your numbers now, cuz. Keep 'er 'tween the ditches.