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This thread is about coming up with thr best priced replacement tranny setup for K-series motors, specifically my 06-11 Si K20Z3. One of my goals over the winter is to make a backup tranny for my Si. But, in the process, we'll find out the differences from other K-series chassis and see what fits them too.
So far, I've heard that EP3 5-speed trannys and rsx base 5-speed trannys are the cheapest OEM trannys to get.
The 5spd is cheap to get. The problem for me and you is that the VSS is different so you need to modify them to work for our cars. You would also need to change the shifter mechanism on the top too if I recall correctly.
I have BOXES of gears lying in my garage. I often see people parting out broken transmissions for cheap and I like to snatch up the good stuff like 2nd and 3rd because those are the gears I tend to always break. I would love to have a stock spare just to put in while I repair my broken one lol
But hopefully this next season I won't break one at all!! The K series transmission is definitely the weak point to boosted Ks... only true fix is to save up a LOT of money and go PPG. . .
An easier solution is to get the gears from the 5 speed and put it in your current case. Then you don't have to modify anything, at least that's my understanding.
^that!! To get the Ep3 trans you need to modify 3 or 4 things on the case. Things just don't bolt down the same, the best thing to do is switch the gears. And if you want one hell of a highway MPG queen you can swap in a 6th gear.
to switch the gears into your stock case, you need to get at the minimum a new countershaft bearing, part # 91003-PPT-004 for the 4.3 final drive. Also a good idea to change the transmission baffle as well.
Can you elaborate, go into as much detail as possible?Quote:
Originally Posted by snizzletoff
I can elaborate a bit, but i haven't attempted to modify an ep3 trans to fit a k20z3, so i may not have all the info i need. Simply put i wouldn't do it. You already have the correct trans case and that should be the one you use and i haven't heard of anyone breaking them yet.
But the biggest 2 issues you have are with the Speedo sensor and the cable stay braket. To elaborate
1) the speedo in the ep3 and the SI are in different locations completely, so the only thing that you can do if you want a speedo is fill in the old speedo hole, probably by tapping it an getting a good plug and hondabond it in or weld it closed. The ep3 trans has the location of our speedo hole cast into the case but its not tapped or drilled so that would need to be done, you would also have to hondabond this hole since i doubt you would get a drill bit EXACTLY the same size.
2) the cable stay for the shift assembly bolts down with 3 bolts, the front most bolt will not go in because of the reverse lockout location. I really don't know a solution to this unless the stock EP3 one would work for our car
In conclusion. I think its foolish to use the case that isn't designed for the platform. If your have to replace your trans your allready going get balls deep in the car, you might as well take the extra 20 bolts out around the case and switch the internal gears. Its pretty damn straight forward but when i do it again i will make a detailed writeup. Either when i get sick of 5th gear grinding or i break something.
Yes he is correct. I have had long talks with a few people. Gearspeed, ppg and mfactory just to name some. Best way to swap the ep3 gears into our z3 case. I used an calculator to test the top speed on the ep3 1-4 or was it 1-5 and our 6th gear and at top of fourth gear it was like 140mph. Now if you want you can get ppg 1-4 for 3889 or just 3-4 for 1800 that is probably what I am going to do. They are rather long great for enjoying the boost. Also you can get another company that says for 4000 you can get 1-4 and at the top of fourth you will be at 160mph but that is overkill fun but overkill. Slowsi is going to be doing this swap and I will be there taking pics and helping out I will let yall know what will happen.
Thanks for the info guys. What about the rsx 5 speed tranny? I knew literally nothing about the ep3 case situation, in fact I know nothing about this topic. That's why I created this thread.
Does the rsx tranny as a whole swap or is it a gear transfer again? I'm just looking at options
The rsx and ep3 both use the k20a3 so its the same trans. Same issues apply to.the rsx 5spQuote:
Originally Posted by Si Speed 317
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Good to know, thanks! Gonna start looking into spare trannies. I think Ainokea did a 5 speed swap a couple years ago right?
Just swap out the guts in the 5speed and put them into your 6 speed case and keep 6th. I also talked to Jotech and he said for 900 plus shipping he will build you one that holds up to 398tq. That is not bad at all just find a spare tranny and ship it off to get it worked on. I did read a post that he did not tell what he did to it but as long as it holds up to 398tq I think most of us will be fine.
Yea he did my friends tranny. I have confidence in it, as ive been in the car. But I don't like not knowing whats done, ratios, etc. I know he started out with OEM gears from other cars, like the element. But then his stuff disappearedQuote:
Originally Posted by ksboi
900 bucks and not knowing what he has done to it, i wouldnt trust it imo.
I talked to him about the trans build they do. They tell you what they do, but the things they told me didn't really make it sounds any stronger. maybe they leave some things out. They also didnt tell me it would hold 350tq though. Also I don't think it comes with a warranty. So it might hold, but who knows for how long.
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It also might never get done or shipped to you.
It it will not get shipped I have some close nit military friends who have no problem going to see him. I may just buy the new 3/4 from honda and slap it and and during income tax drop the 1900 on the ppg 3/4. Those are stupid long ratio I wanna say 140-150ish in top of 4th lol. Should be a fun drive to get icecream.
i remember a while back jeff from go power/skunk2 was saying ppgs were a waste but i forgot the reason as to why.
and is it just me or has anyone else noticed that most race cars have been using oem gears and just replacing them as they break?
but as for me i bought a spare fg2 tranny for a good price and i just have it chillin waiting for the stock one to break
I dont really think you can say they arw a waste. They will hold crazy amounts of power without fail. They are crazy expensive. 4-5k to get the trans done right not including labor if you Cant takle it yourself. Compae that to 90 dollars or so to for a single broken gear..its a big difference and will take a very long time for that to equal 5k. If you buy full gear sets at 300ish it will clearly add up much fasterQuote:
Originally Posted by fre$h si
Most people do just fix the gear that breaks drop your trans 4-5 times a year and you won't wanna keep doing it. You can keep beating ppg's also the ratios are better for high power cars.
I will probably also just get a 5 speed, use a 4.3 final and a 6th gear...but I would say they are far from a waste
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I am trying to get a group buy with ppg but it seems they think I wanna build a race team. I have seen about 5 companies that offer stronger gears for a complete built tranny with PPG 1-4 and stock 5/6 it was 4k. That is not bad if you got a extra tranny laying around. I just want to do it right the first time and not have to worry about it. My car is basicly to scare my family and beat on it a few times. Plus my son loves it.
Testing [MENTION=209]ksboi[/MENTION] [MENTION=2]Si Speed 317[/MENTION] [MENTION=56]Adm_rsx[/MENTION] [MENTION=28]Spaz[/MENTION] [MENTION=1]BoostedK20[/MENTION]
Nothing yet man. IdkQuote:
Originally Posted by BoostedK20
It went to my email saying someone said my name. You have [MENTION=1]BoostedK20[/MENTION]
Testing the new tag feature ;)
So found another company who makes gear set for the K trannies and if my income tax comes in like I pray it will I am buying new oem synchros and ppg 3/4 gear set and slap that puppy together.
Frana vehicles makes a set. I'm hoping to get a set next year tax time.