Hi,

I hope I am not beating a dead horse here with this post. I did do some searching on this site for my specific questions but ran into quite a few dead links.

I have a 1992 Acura Integra GSR with the YS1 Trans out of the car. I know it's 5th gear ratio is 0.875. I am looking to put a longer gear in for highway cruising. (Currently out of car)

I also have another transmission that I believe to be a S1/YS1 US 90-93 Integra RS/LS/GS with a 5th gear ratio of 0.742. I don't know exactly what trans this is but this is my guess. (Currently in car)
I tried using some online calculators to find out what transmission is in my car but my math skills seem to be off. haha

My car still has the original B17A1 and I am running 195/45/r16 tires on a 16x8 Wheel. Right now on the highway at 80mph I am at 4100/4200 @RPMS estimated.
Trying to figure out if the trans in my car currently would be a GSR or LS trans with this gearing.

I want to put a 5th gear (main & countershaft gears) in my original YS1 trans. I was wondering can I use an S80 US 94+ LS/GS/ with a 5th gear ratio of 0.714 in it, or will only a S1/YS1 US 90-93 Integra RS/LS/GS 5th gear work because it is a cable trans?

I found a post where someone said "Acura 94-01 LS counterhaft 5th gear. Acura 94-01 LS mainshaft 5th gear. Fits right in 94-01 hydro and 92-93 YS1 cable transmissions."
I'd just like to confirm before I make this purchase.
I understand that the YS1 has a 4.4 final drive and this will not solve everything but I would like to drop the RPM's some for highway driving and keep my original trans in the car.

Thanks in advance

Reference Links
https://honda-tech.com/honda-crx-ef-...b16-s1-555929/
Specnically Speaking: B-series Gear Ratio Guide + More!
https://honda-tech.com/transmission-...ssion-2879988/
Gear Ratio Calculator - Free Shipping on Orders Over $99 at Summit Racing
https://tiresize.com/calculator/

 

All i really need to know now is, will 94-01 LS 5th gears work in my 92-93 YS1 Cable Trans or do I have to find 90-93 LS 5th gears?

 

I believe the hydro ls/GS/rs/special edition 5th gear would work in the cable trans case. To confirm, call synchrotech and ask them..

 

I will do that. Thanks

 

I'm sure it will work. But the higher 5th gear thing is such a terrible idea for anything except 80+ MPH cruising. And even then...the benefits are minimal.

 

Can you explain more on this. I don't race my car, it is solely a daily driver but I want to keep it close to original with the YS1 trans. If it only costs around $100 for an LS 5th gear and I save 600 RPMs on the highway at 80MPH. It seems to make sense for my use case. Plus my car has Skunk2 Mega Power exhaust so lowering the RPMs a little and not having it as loud on the highway would be another added benefit.

 

I'm assuming you have a B16/17.

Because you'll end up on a road with a 35-40mph speed limit. 4th? No 5th. No...wait...4th. No....5th.

Or a road with a 45mph limit. 5th. 5th. Dammit slight hill. 4th. ****...wait...5th? No...still 4th. Ok 5th.

Accelerating to pass at 55-60mph. 5th. Hmm...nothing's happening. 4th HOOOLLLY CRAPPPP. 5th. Dammit too early. 4th. Ok...5th.

There's a reason the B16/17 is geared the way it is. 111ish LBs of torque. Efficient af higher RPM. Lean fuel map at high vacuum. Etc.

I'll touch on the irony of using an insanely loud exhaust on a street car...but then lenghtening the gears because its a street car.

To go further, the exhaust will go from ringing on the highway with a B17 5th gear to droning on the highway with the LS 5th gear.

MPG differences are minor. Look at EPA estimates for the LS vs. GSR. Or on DC chassis', differences between LS's, GSR's, and ITR's. Or compare a LS integra to an EM1.

Synchros have to work harder with bigger gear deltas. This isn't a huge deal for 5th because...what kind of jackass is slamming 5th?

I believe your speedo will also be off.

 

Update: I got a hold of synchrotech and they confirmed that a 5th gear from a hydro trans would work in my YS1.

Thanks for your input you seem like you have dealt with these situations before hand lol.

That means I have 4 different routes to chose from.
Original GSR - 5th gear 0.875 (Which seems unnecessarily long)
94-01 GSR - 5th gear 0.787
94-01 LS - 5th gear 0.714
90-93 LS - 5th gear 0.742

I played around with the gear ratio calculator for these and came up with this.


Here are some MPG calculations:




Also, I did not put the Skunk2 Mega Power Exhaust on the car it was on there when I bought it. I have looked into getting a SKUNK2 MegaPower Exhaust/Muffler Silencer, Part # 415-99-1485 to see if that would make a big difference.

One of the main reasons I want to this is so I can sell the trans thats currently in the car and put back in my original YS1 and it doesn't seem like it would be very difficult to change the 5th gear while its already out and then put it back together since I planned on doing this anyways.

 

I agree to an extent, Honda geared it that way for a reason, but if he's willing to deal with the slight inconvenience of holding 4th a little longer to not be at 4500rpm on the highway, then let him.

The speed sensor is dependent on the final drive so that wouldn't be affected.

 

Even just switching to the 94-01 GSR 5th seems like it would make quite a bit of difference.

 

The 94-01 GSR 5th may be a better choice.

I remember buying a 01 GSR a long time ago...and changing to a B16 trans within a week haha. I'd rather have short gearing. But I realize other people may not.

I only shared my opinion against it to shed light on some downsides that you may not have considered.

I think that functionally, a LS 5th is too much of a delta from the YS1 4th. And the B17's "torque" would have a hard time filling that gap.

A 94-01 GSR 5th is a middle road gear. If you're really after a few less revs...then it may be a good fit for you.

Again....my opinion.

 

I'm glad that I had some other viewpoints on the situation.

After analyzing a litte further I think a 94-01 GSR 5th makes sense. I bought one on eBay for $73 so I'm gonna try it out.

Thanks for all the help guys!

 

Actually that turned out to be a LS 5th so he canceled and refunded me the order. So if anyone has one for sale I'm on the lookout. Thanks

 

PM'd