Okay, I have an OBD1 LS swap and what I thought to be an LS tranny also, but I believe it might be a GSR tranny. I'm sure the whole tranny discussion has been brought up several times, so I apologize for that.

Here's the deal, When I'm on the Highway @ 75mph, in 5th I'm at 3600rpm. Now to me that sounds high for an LS tranny. Here's a break down of the first 3 gears. **These are the rough rpm numbers...but they are in the general area +/- 250rpm**

1st @ 20mph = 5000rpm
2nd @ 40mph = " "
3rd @ 60mph = " "

Haven't done 4th or 5th yet. So does this sound like a typical GSR, LS or possibly a b16 tranny to you all?

 

try getting it in redline, that way it'll be easier to tell, for GSR tranny the 1st gear redlines at 40mph and 2nd at 60...both at 8k. not sure about those 5k's that you have.

late,
yoda

 

LS motors wont go that high...thanks tho. I'm not sure if I'll be able to get a straight answer, without counting the teeth on the intermediate shaft? <--is that right?

 

Anyone else?

 

What size tires do you have?

 

Here's an easy way to tell, i also have an LS w/ a gsr tranny.
At 60 mph, i'm at 3k rpm in 5th gear
At 80 mph, i'm at 4k rpm in 5th gear.

3rd gear redlines at 78 mph according to my gauge cluster. 4th gear redlines at about 100 mph.

 

That's funny, at 80 in 5th I'm at about 4000-4100 and I still have the LS tranny.

My 3rd gear redlines at 83 mph though.

 

A gsr tranny runs 42mph on 1st and 60mph on second gear but this is redlining at 8000 rev's. With an ls motor with a redline of 5000 rev's i don't think you can feel full performance of a gsr tranny.

 

is their anyway u can take out the tranny n look, or do u have to open it up??

 

right now I'm on 195/60/14's, but the speeds and rpm's are very close when I'm on 205/40/17's also.

I think I have a GSR tranny, I guess I just need to get some times to see where it is and then, maybe I can get a better idea.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nine5IntegraLS &raquo;</TD></TR><TR><TD CLASS="quote">Here's an easy way to tell, i also have an LS w/ a gsr tranny.
At 60 mph, i'm at 3k rpm in 5th gear
At 80 mph, i'm at 4k rpm in 5th gear.

3rd gear redlines at 78 mph according to my gauge cluster. 4th gear redlines at about 100 mph. </TD></TR></TABLE>

Thats sounds just like my car.

 

if you're doing 75 and you're at 3600, you've got an LS tranny for sure. 3600 on a gs-r is about 10mph slower. i calc'd 77mph on LS tranny for 3600rpm and 68mph on gs-r. you got LS, man. there's no way my tire formula is that far off. and besides, it's a dam good formula.

 

Hmm, well damn...I thought LS trannies were alot longer then this....guess not, thanks for the help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91TegLS &raquo;</TD></TR><TR><TD CLASS="quote">That's funny, at 80 in 5th I'm at about 4000-4100 and I still have the LS tranny.

My 3rd gear redlines at 83 mph though.</TD></TR></TABLE>you dont have a ls trannie you have a gsr
i haveowned all the trannies and a ls trannie has very long gears.
going 80mph in in the lower 3k rpms

 

No net necessarily, the 90-91 LS's have a different tranny than the 92-93 LS trannies. They have slightly shorter gears, my girlfriends STOCK 90 GS also revs at 4k rpm at 80 mph in 5th.

 

I'm sorry but you are wrong riceball, and 95lstegman is right on this one..

..here is the easiest way to tell.. with an ls your tach is right around 4K at 80 mph, and with a gs-r it will be a bit over 4K, more like 4500-4800 or so.. or you could actually take your actual numbers and plug them into the formula that lstegman is talking about and then it should be quite obvious, the math is really not that hard to figure out.

ohhh... and testing out which tranny you have by taking the engine to red line is just about the stupidest thing i've heard in a long time, thanks for the laughs..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RaNMaN &raquo;</TD></TR><TR><TD CLASS="quote">..here is the easiest way to tell.. with an ls your tach is right around 4K at 80 mph, and with a gs-r it will be a bit over 4K, more like 4500-4800 or so.. </TD></TR></TABLE>
there's no way. 3000 rpm is about 80 on an ls. i know because i had one. a b16 is way shorter than a gsr, and 80 is at about 4250. i know because i have one.
http://www.car-videos.com/tools/speedrpm.asp &lt; speed calculator
http://www.ff-squad.com/tech/temp/Bgears.htm &lt; b series gear ratios
the end.

 

http://www.team-integra.net/se...s.asp


94-01 GS-R
Tire Size 195/55/15
RPM 1st 2nd 3rd 4th 5th
500 2 4 6 8 10
1000 5 8 12 15 20
1500 7 13 17 23 30
2000 10 17 23 31 40
2500 12 21 29 38 50
3000 15 25 35 46 60
3500 17 29 41 54 70
4000 20 33 47 61 81
4500 22 38 52 69 91
5000 25 42 58 77 101
5500 27 46 64 84 111
6000 29 50 70 92 121
6500 32 54 76 100 131
7000 34 58 82 107 141
7500 37 63 87 115 151
8000 39 67 93 123 161
8100 40 68 94 124 163


5th gear for me at 80mph I'm at 4k

 

Some of you guys are looking at this the wrong way. Tire size makes no difference whatsoever what speed is displayed on the speedometer vs. engine speed. The speedometer reads off the transmission, and when you change tire sizes, nothing in the tranny or engine changes. Everything between the engine crank and the speed sensor's driven gear remains the same, and so the speedometer always shows the same speed at any given RPM in any given gear, regardless of tire size.

Now an easy way to tell a GS-R tranny is to look at speed vs. RPM in 5th gear. Take the engine RPM and divide by 50, and that will be a very close number to your indicated speed if you have a GS-R tranny. 3000 RPM should be about 60, and 4000 should be about 80, and so forth.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSvtec03 &raquo;</TD></TR><TR><TD CLASS="quote">there's no way. 3000 rpm is about 80 on an ls. i know because i had one. a b16 is way shorter than a gsr, and 80 is at about 4250. i know because i have one. </TD></TR></TABLE>
you must have something wrong with your car. my LS has factory wheels, factory tires, and no gears have been touched since may of '94, when it was assembled. 80mph in my car is about 4000rpm by the tach and speedo, and when calculated, sure enough, i'm right again. here's a hint:
use (pi)*(diameter of tire)circumference of tire)
remember, pi is approximately 3.141527

if this seems too hard, go here:
Tire Size Calculator

remember, not all tires of the same size, say 195/55/15, are actually the exact same diameter, width, or circumference. i once held two 205/60/15 tires in my hands, and one was actually TWO INCHES taller than the other when set on the ground.

this tells you there are 860.0 rev/mi of the tire.
take your engine speed. for me, at 75ish on the highway, i'm doing about 3500rpm in my stock-geared stock-tired LS. confirmed by my SFC, not going by just dash instruments. now, we take the engine speed, and reduce it by the gearing:

3500rpm / final drive / 5th gear = rev/min of the tire
3500/4.266/0.714=1149.077
if it's doing 1150rev/min, we can see:

rev/min divided by rev/mi = rev/min TIMES mi/rev = mi/min
mi/min times 60 = mi/hr
(1150/860)*60=80.23mph

that's for LS. let's try GS-R:
(3500/4.400/0.787)*(60)/(860)=70.5mph

now, your speedo can't be 10mph off, but it is a few off at that speed. a few slow, i think. so does it say 82ish at 3500rpm, or 72ish? now you know which gearbox you have. same calculations for any tire size, any gearing, and any rpm. you can also [algebraically] solve for any other variable you like with speed constant. personally, i set up an Excel table to do it all for me, but here's just a lesson in case anybody here has been out of school for too long, and doesn't have a job with basic math in it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95lstegman &raquo;</TD></TR><TR><TD CLASS="quote">you must have something wrong with your car. my LS has factory wheels, factory tires, and no gears have been touched since may of '94, when it was assembled. 80mph in my car is about 4000rpm by the tach and speedo, and when calculated, sure enough, i'm right again. here's a hint:
use (pi)*(diameter of tire)circumference of tire)
remember, pi is approximately 3.141527

if this seems too hard, go here:
Tire Size Calculator

remember, not all tires of the same size, say 195/55/15, are actually the exact same diameter, width, or circumference. i once held two 205/60/15 tires in my hands, and one was actually TWO INCHES taller than the other when set on the ground.

this tells you there are 860.0 rev/mi of the tire.
take your engine speed. for me, at 75ish on the highway, i'm doing about 3500rpm in my stock-geared stock-tired LS. confirmed by my SFC, not going by just dash instruments. now, we take the engine speed, and reduce it by the gearing:

3500rpm / final drive / 5th gear = rev/min of the tire
3500/4.266/0.714=1149.077
if it's doing 1150rev/min, we can see:

rev/min divided by rev/mi = rev/min TIMES mi/rev = mi/min
mi/min times 60 = mi/hr
(1150/860)*60=80.23mph

that's for LS. let's try GS-R:
(3500/4.400/0.787)*(60)/(860)=70.5mph

now, your speedo can't be 10mph off, but it is a few off at that speed. a few slow, i think. so does it say 82ish at 3500rpm, or 72ish? now you know which gearbox you have. same calculations for any tire size, any gearing, and any rpm. you can also [algebraically] solve for any other variable you like with speed constant. personally, i set up an Excel table to do it all for me, but here's just a lesson in case anybody here has been out of school for too long, and doesn't have a job with basic math in it.</TD></TR></TABLE>
:shakes head:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSvtec03 &raquo;</TD></TR><TR><TD CLASS="quote"> http://www.car-videos.com/tools/speedrpm.asp &lt; speed calculator
http://www.ff-squad.com/tech/temp/Bgears.htm &lt; b series gear ratios
the end. </TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PatrickGSR94 &raquo;</TD></TR><TR><TD CLASS="quote">Some of you guys are looking at this the wrong way. Tire size makes no difference whatsoever what speed is displayed on the speedometer vs. engine speed. The speedometer reads off the transmission, and when you change tire sizes, nothing in the tranny or engine changes. Everything between the engine crank and the speed sensor's driven gear remains the same, and so the speedometer always shows the same speed at any given RPM in any given gear, regardless of tire size.

Now an easy way to tell a GS-R tranny is to look at speed vs. RPM in 5th gear. Take the engine RPM and divide by 50, and that will be a very close number to your indicated speed if you have a GS-R tranny. 3000 RPM should be about 60, and 4000 should be about 80, and so forth.</TD></TR></TABLE>
80 in an ls is about 3600 rpm

 

Well damn. I think I have a GSR tranny and other have agreed with me. I buddy of mine who had a b18b swap into a EG hatch had the LS tranny and then switched to a b16, he's driven my car and ridin in it, he thinks it's not a LS tranny but not sure on GSR or b16, I'm thinking GSR.


I'll get some video of my car this weeken, maybe that will help???

 

Yo Nick, here's a clip of my GSR tranny on my LS:
http://www.we-todd-did-racing....DE%3D
Maybe it will help you distinguish if you have a GSR or an LS tranny.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NickW &raquo;</TD></TR><TR><TD CLASS="quote">Well damn. I think I have a GSR tranny and other have agreed with me. I buddy of mine who had a b18b swap into a EG hatch had the LS tranny and then switched to a b16, he's driven my car and ridin in it, he thinks it's not a LS tranny but not sure on GSR or b16, I'm thinking GSR.
I'll get some video of my car this weeken, maybe that will help???</TD></TR></TABLE>
well, after driving a stock civic, or many other cars on the road, even the LS transmission would feel short-geared. and it is. that's why i have no qualms with my gearing. good balance between being able to grab a low gear at speed and having short gears for stand-still acceleration. in my opinion, rather than getting a short tranny and cruising at high engine speed (loud + slightly less fuel economy), just get more power out of your engine. easy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95lstegman &raquo;</TD></TR><TR><TD CLASS="quote"> in my opinion, rather than getting a short tranny and cruising at high engine speed (loud + slightly less fuel economy), just get more power out of your engine. easy.</TD></TR></TABLE>
that's pretty silly, considering that the LS transmission was designed for fuel economy alone. just not as much as a civics. if you try to get any kind of power out of your car, the LS tranny will do nothing but hold you back. its a lot easier to slap on a shorter tranny, than to try to make up for it with power. look at it this way, too: to get more power out of your engine and to have an LS tranny is not really an advancement; you're really making up for accelleration LOST by having that terrible, terrible transmission. that could be power better utilized by having a shorter tranny, such as a gsr or b16