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Civic SI trans with lsd

Old 04-15-2018, 10:08 AM
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Civic SI trans with lsd

has anyone swapped in a civic SI trans in their tsx yet? They are pretty affordable now.
They should be a direct bolt on.
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Old 04-15-2018, 10:35 AM
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Good idea. Would need so much a LSD in our TSX. I wonder if we could keep the TSX 6spd and add the LSD from the SI....
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Old 04-15-2018, 11:20 AM
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Iíve never done trans work but I think you have to tear into the team to add lsd. I figured why not just throw in oem Honda lsd equipped trans. Just a straight swap I hope.

Just want that torque steer gone.
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Old 04-15-2018, 11:29 AM
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Originally Posted by Username 0 View Post
I’ve never done trans work but I think you have to tear into the team to add lsd. I figured why not just throw in oem Honda lsd equipped trans. Just a straight swap I hope.

Just want that torque steer gone.

I've driven a number of FWD cars with manual transmissions and LSD; some have obvious torque steer, others have less-so. Have you driven a Civic Si to confirm the absence (or at least reduction in the amount) of torque steer?
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Old 04-15-2018, 12:14 PM
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I test drove a 2012 si when they first came out but thatís about it. Not enough to compare.
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Old 04-15-2018, 12:27 PM
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Originally Posted by Username 0 View Post
I test drove a 2012 si when they first came out but thatís about it. Not enough to compare.
The thing is, even with the best LSD in the world, there is still going to be some torque steer; fact of life with FWD cars. I would suggest you spend some quality seat time in a Civic Si to determine of the improvement is enough to warrant all of the work and expense you're going to need to put in to gain LSD for your car.
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Old 04-15-2018, 01:48 PM
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Good lord man. Anything with lsd is going to be way better in my tsx. With the extra power that the supercharger gives me, I want the extra traction.
I donít care about cost. Letís focus on the point of doing this.
A good si trans costs less then $1000. Iíve seen them for as little as $600. Yes, I know the dangers of buying a used trans.
I do all my labor and that will save me the cash to buy an upgraded clutch.

Just wondering if anyone has done this on a cu2 yet.
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Old 04-15-2018, 01:51 PM
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I think you're missing the point; often with LSD things can actually get worse for FWD cars (the 2004-2005 6MT TLs are a good example). It could be an LSD application helps your car, however, there is a very good chance if you spend the grand on the transmission and then put it in, you'll be very unhappy with the results; in cases like this a little due diligence can go a very long way.
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Old 04-15-2018, 02:01 PM
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Why would I be unhappy with lsd?
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Old 04-15-2018, 02:18 PM
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Originally Posted by Username 0 View Post
Why would I be unhappy with lsd?
When FWD LSD is coupled with an excess of power the car can often become very difficult to handle as first one side bites and then the other side (meanwhile the car is all over the road); it isn't at all like how a RWD/LSD application behaves where you get two nice clean rubber marks on the pavement.

All I'm saying is to drive a Civic Si and decide for yourself; it is as simple as that.
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Old 04-15-2018, 02:23 PM
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I havenít seen any threads of the supercharger/turbo si guys with said issues. So maybe Iím good.
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Old 04-15-2018, 02:26 PM
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Do what you want, it's your money.
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Old 04-15-2018, 02:35 PM
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$$$$$$
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Old 04-15-2018, 04:04 PM
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Old 04-15-2018, 05:22 PM
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Originally Posted by horseshoez View Post
When FWD LSD is coupled with an excess of power the car can often become very difficult to handle as first one side bites and then the other side (meanwhile the car is all over the road); it isn't at all like how a RWD/LSD application behaves where you get two nice clean rubber marks on the pavement.

All I'm saying is to drive a Civic Si and decide for yourself; it is as simple as that.
A civic si doesn’t come with an extra boosted 100 ponies, so driving an si is not going to do anything for him, not to mention the difference in chassis, not a one Honda guy with added power from boost I’ve ever spoken to has complained about switching from open diff to lsd, I’d rather torque steer with traction than just rip ass going nowhere, it’s called learning how to modulate that extra traction with your right foot. Not understanding what your conflict is with lsd, no big hp performance fwd cars run an open diff from the factory.


Last edited by Jaheri_cbp; 04-15-2018 at 05:27 PM.
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Old 04-15-2018, 05:25 PM
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Anyone who has complained about torque steer in their TL because it has lsd obviously prefers burnouts than go fast cuz torque steer can be controlled by the driver, unless said person just sucks at driving.
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Old 04-15-2018, 05:29 PM
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Optimusaccord dropped an lsd into his factory trans and loved it on his turbo setup, just FYI, don’t think the trans’ are interchangeable cuz the casings are different, but a factory lsd buy itself does drop right in if desired.

Last edited by Jaheri_cbp; 04-15-2018 at 05:33 PM.
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Old 04-15-2018, 05:31 PM
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Originally Posted by Jaheri_cbp View Post
Anyone who has complained about torque steer in their TL because it has lsd obviously prefers burnouts than go fast cuz torque steer can be controlled by the driver, unless said person just sucks at driving.
Clearly you've never driven an early 6MT TL.
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Old 04-15-2018, 05:54 PM
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Originally Posted by horseshoez View Post
Clearly you've never driven an early 6MT TL.
Yeah you right, I just owned an 04 cl type s for 6 years thatís all.
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Old 04-15-2018, 05:55 PM
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It was a 6 speed as well in case you were wondering
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Old 04-15-2018, 06:15 PM
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Originally Posted by Jaheri_cbp View Post
It was a 6 speed as well in case you were wondering
Well then you must have super-duper-gonzo driving skillz because even professional drivers back in 2004 when the TL came out complained about not being able to control the car. We all bow to your superior skillz.
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Old 04-15-2018, 06:19 PM
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Originally Posted by horseshoez View Post
Well then you must have super-duper-gonzo driving skillz because even professional drivers back in 2004 when the TL came out complained about not being able to control the car. We all bow to your superior skillz.
I knew how to let out when it decided to pull to the right. Call it what you want lol
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Old 04-15-2018, 07:19 PM
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Originally Posted by Jaheri_cbp View Post
Optimusaccord dropped an lsd into his factory trans and loved it on his turbo setup, just FYI, donít think the transí are interchangeable cuz the casings are different, but a factory lsd buy itself does drop right in if desired.
i just did some pic comparisons between the si and the tsx manual trans and they almost completely identical. All the bolt holes line up.
I always read that both cars have almost identical motor/trans except for a few minor things. But mounting points are the same.
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Old 04-15-2018, 07:46 PM
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Sorry, didn’t mean to jack your thread with this nonsense iselfdevi, but I have a feeling you will love the lsd. The older cl and tl type s’ did have bad torque steer but they HOOKED, and I really only experienced heavy torque steer going wot in first gear and ripping into second sometimes, and if I’m not mistaken that was due to a poor halfshalft design in those cars, not the fact they had too much torque with lsd. Like I said earlier Optimus dropped an lsd out of a 9th or 10th gen SI and he loved it with his turbo setup. Pretty sure he just swapped the entire final drive out of the SI into a stock trans if I remember correctly, which makes the gears a little longer.
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Old 04-15-2018, 07:50 PM
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Originally Posted by Username 0 View Post


i just did some pic comparisons between the si and the tsx manual trans and they almost completely identical. All the bolt holes line up.
I always read that both cars have almost identical motor/trans except for a few minor things. But mounting points are the same.
Well then rock out with the rooster out MAN!!! I just remember Optimus gutting a trans to do the lsd swap. Would be awesome to see your progress on this cuz Optimus was the only person I remember with the cojones to go lsd and write about it in these forums.
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Old 04-15-2018, 08:04 PM
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Not sure if Iíll be going lsd anytime soon. Iím looking to get a tanabe catback first. The lsd thing is an idea Iíve had since I went boosted and my front right tire would spin while the left was like, nah.
But when I do it, Iíll be sure to post about it.
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Old 04-16-2018, 09:50 AM
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Originally Posted by Username 0 View Post
Not sure if Iíll be going lsd anytime soon. Iím looking to get a tanabe catback first. The lsd thing is an idea Iíve had since I went boosted and my front right tire would spin while the left was like, nah.
But when I do it, Iíll be sure to post about it.
You're not gunna wanna swap out the trans, it's easier and cheaper to just buy the Si LSD and install it when you do your next clutch change. I almost did it when I went with stage 2 clutch, but the LSD was another ~$600. I didn't really have the money for it. Later on I really wished I had done it. I'd say definitely buy the Si LSD and do the swap when your clutch change is due.. especially if you're paying a shop to do it, no extra labor to add LSD.
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Old 04-16-2018, 10:00 AM
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Originally Posted by Jaheri_cbp View Post


Yeah you right, I just owned an 04 cl type s for 6 years thatís all.


There was no CL Type S in 2004
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