Jdm RWD SR20DE install

[Booger]

Hi everyone, I’ve been a member here for years and it’s always been my first place to look for information on swaps for my 510. Little back story, I’ve owned my 72 510 for almost 14 years now and my old ka24de motor (7year old swap) finally went out on me. Having said that, I had an opportunity to jump on a s14 SR20DE (RWD version NON TURBO) and I didn’t even hesitate.

   I’m currently in the process of cleaning it up, changing some thing and fixing small issues on the SR motor. This leads me to my question if your still reading......

Im gonna need a new clutch. I know what your thinking... use the internet!! But honestly....there isn’t much out there for this motor since it’s a rwd sr non turbo. All the clutches listed are different; 

SR20DE FWD Sentra, RWD SR20DET, KA24E, KA24DE and even my RWD SR20DE. All of these use different flywheels or clutch bolt patterns. 

  The KA engines utilize the 225MM but the spines on the clutch are too narrow for the transmission. I’ve been reading that guys are swapping out the RWD SR20DE flywheel (225mm) with a SR20DET flywheel (240mm) however does a SR20DET pressure plate and splines work with a stock s14 sr20de 5 speed trans? 

  I’m pretty much at a stand still rite now with the clutch and flywheel situation, so if anyone out there has a jdm s13/s14 RWD sr20de and knows what I’m talking about...I’d be stoked to talk with you more about your setup. I know I'm not the only one out here with this motor in a 510 😆. 

 

Edited August 18, 2019 by Booger

[Stoffregen Motorsports]

The internet is full of experts. I just read about five different threads on five different forums and they all had different information.

 

I would try calling someone like HKS or Exedy. Maybe the guys at T3 would know.

[Booger]

44 minutes ago, Stoffregen Motorsports said:

The internet is full of experts. I just read about five different threads on five different forums and they all had different information.

 

I would try calling someone like HKS or Exedy. Maybe the guys at T3 would know.

 

Yeah I was getting the same misinformation from multiple different sites. I’ve been on the phone with many different companies the past few days as well. I know the sr20det flywheel will work on my RWD sr20de non turbo. However...I don’t know which clutch kit I can use once I switch over to the det 🤷‍♂️

[Icehouse]

I've got a few of those motors.  The KA clutch disk works fine.  The preasure plate is the issue.  For some stupid reason it's different then the KA preasure plate.  I just stoned mine flat and ran it.  Been fine for years.  Not sure why the transmission splines didn't work.  All the 71C splines are the same.  I'm always mixing and matching them.  Speaking of that you should bell swap you KA trans and run it.  It's got a .75 5th gear instead of the .85 that's in the SR20DE trans.  Nice to drop the RPM's on the freeway.  Then sell the SR trans to me cheap.  We like the low 5th for our racecar :)  

[datzenmike]

When you got the RWD SR20DE from an S13 (obviously an import) I assume it came with a transmission? I would guess this would be a 71C like Jeff said. Here all 71Cs were the same 24 spline that is approximately 24.6mm diameter or 0.97". Count yours. And post a picture of the transmission, I'd like to see this..

 

 

KA engines in cars use a 225mm PP but truck KAs use a 240mm.

[Stoffregen Motorsports]

A couple websites I checked out yesterday had clutch combinations galore. I just did a search for rwd SR20 and came up with about four websites.

 

[Icehouse]

22 hours ago, datzenmike said:

When you got the RWD SR20DE from an S13 (obviously an import) I assume it came with a transmission? I would guess this would be a 71C like Jeff said. Here all 71Cs were the same 24 spline that is approximately 24.6mm diameter or 0.97". Count yours. And post a picture of the transmission, I'd like to see this..

 

 

KA engines in cars use a 225mm PP but truck KAs use a 240mm.

 

 

For sure a 71C   Here is our collection of broken transmissions waiting to be rebuild.  All 71c's  SR20DET, SR20DE a few KA and VG's also.  

 

 

 

 

 

2 hours ago, Stoffregen Motorsports said:

A couple websites I checked out yesterday had clutch combinations galore. I just did a search for rwd SR20 and came up with about four websites.

 

 

They are all turbo SR clutches, 240mm the NA SR is 225 with a very small hole pattern for the preasure plate.   The 225mm preasure plates I tried didn't fit.  Maybe a FWD SR one might?  I tried all the small RWD ones I had laying around with no luck.  

 

 

 

 

 

[Booger]

Alright everyone...I have an update. Just like it was stated above...the RWD SR20DE uses a 225mm flywheel while the SR20DET uses a 240mm Flywheel.

  Having said that, I can use a SR20DET flywheel (240mm)  but I had to use the spec sn331 clutch kit to make all this work. When I was ordering the clutch and flywheel from SPEC,  I asked SPEC to give me the info (year/make/model) on that clutch kit so I can purchase any clutch kit I wanted in the future...but they were reluctant to give me that info. I’m assuming because they wanted a returning customer haha. Anyways...thanks everyone for all the help. Below is a list of the parts I used. 

 

 

SPEC Clutch SN22S Single , Steel Flywheel  SPEC Clutch SN331 Single , Stage 1

[datzenmike]

5 hours ago, Icehouse said:

 

 

For sure a 71C   Here is our collection of broken transmissions waiting to be rebuild.  All 71c's  SR20DET, SR20DE a few KA and VG's also.  

 

 

 

 

 

 

They are all turbo SR clutches, 240mm the NA SR is 225 with a very small hole pattern for the preasure plate.   The 225mm preasure plates I tried didn't fit.  Maybe a FWD SR one might?  I tried all the small RWD ones I had laying around with no luck.  

 

 

 

 

Tranny porn to me.

[Booger]

Here are a few pictures of the old clutch and the new Spec flywheel and clutch kit. Thanks to those who helped out. I ended up buying ARP flywheel bolts because I read on the FSM that the OEM flywheel bolts are stretch bolts and can only be used once. Having said that, i tossed them because I didn’t want those kind of problems later on down the road. 










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Edited September 1, 2019 by Booger

[Three B's Racing]

Just seen this sorry. I've been running the NA S14 SR20DE in my 510 for 13/14 years now. Yes the original pressure plate is very specific and very expensive if you needed another in which I was told would have to be ordered from Japan, F that. I purchased a Findanza 10lb aluminum flywheel and stock clutch for a DET and it all bolted right in why wouldn't it? My engine is running 180hp at the crank and the clutch is for a 205hp Turbo motor so yeah! it'll work and it does and still chuggin plus it isn't a pressure monster to use its stock.

[Lozer]

Spec has a good product, I used them for my Vett autocross car and was pretty happy with the feel and grab.