While I'm awaiting a new head gasket there hasn't been a lot to do on my car, so I decided to make a little write up for you guys.

For those of us using the S14 SR20DET, we got a little shafted on our throttle body. The s13 SR's and the non turbo S14 SR's got 60mm throttle bodies. We got 50mm. Of course, first thought is to just snag an s14 SR20DE throttle body. These are hard to come by, and if you do find one it will probably cost a good penny. A while back I found out that the 94-96 Infiniti G20 and 95-97 200sx ( both with the sr20de) have a 60mm throttle body that will bolt right on.

There's plenty of informations about about the G20 throttle body on the S14 SR20DET. It's a straight bolt on affair. Nothing magical there. The thing that I never found was a lot of information about the TPS on it. The throttle body I got was off a G20 made on 11/1994 and had 2 plugs coming out of it, and instead of rewiring my brand new Wiring Specialties harness, I decided to attempt to make the SR20DET TPS fit.

Here you see the stock s14 SR throttle body on the left, and the G20 on the right. Pretty noticeable size difference:


You might also notice the pulley on the G20 throttle body. The G20's had the option for cruise. This was another reason I wanted it. I didn't want to have to worry about having to fabricate another pulley on the S14 throttle body. 2 birds, 1 stone.

Upon first inspection, the S14 TPS didn't fit. It has a lip that prevents it from fitting. It's a small plastic lip, so I just pulled out a pocket knife and within 5 minutes had this:



After that, the TPS fit perfect, and the 2 holes for the screws that secure it are fine:




Then we are faced with our next challenge:



As you can see, the two contacts don't meet. Now, you might be able to get by with bending the G20 metal cantact upward. I just took them off and switched the S14 one to the G20 throttle body. This is very easy. There is a 10mm nut holding them on.

G20 left, S14 right


The two contacts removed. Again, G20 left, S14 right



And the S14 contact installed on the G20 throttle body:



Install the S14 TPS back on and it's near perfect!



All that is left is installing the throttle body back onto the intake manifold. Before doing this, I recommend replacing the gasket. I stopped at Autozone and picked one up. Just ask for a 95 G20 TBI gasket. The one I got is a Felpro part #60818 and cost a whopping $1.50. When installing it back onto the throttle body, you can use the S14 throttle body bolts with no issues:





All that's left is to bust out your multimeter and adjust it to .45 volts and you are done. If you are like me and want cruise control, you now have the second pulley and just need a bracket for the cable. I'm going to dig around in the local junkyards and see if there are any that almost fit, but I have a feeling this will need to be custom made. I'll update this once my motor is back together and let you guys know if I see any significant changes.

Enjoy you improved throttle response!

I should also point out that I got the throttle body at the local u-pull-it for 25 bucks, so it's extremely cheap

What about the cold idle kicker?
The S14 SR doesn't have an air valve device like all the other nissan engines, they use a little wax motor to bump the idle when it's cold... It's not something that can be transferred to the other TB.
Just something to think about, not really a big deal in warmer areas, but it's pretty damn important where I live.

I'm guessing that's what the big contraption on the S14 throttle body is? I know the G20 throttle body has the coolant ports to help stabilize idle or something. I live down in Florida so it isn't something I have to worry about, but that is definitely good information for someone like you who does need to take it into consideration. I wanna say that I have seen some G20 throttle bodies with it on there. I'm going to the picknpull on Monday so I'll see if I can find one.

Or, you could pop on a Q45 Throttle body, minimal modification needed (if you get the right year)... and 90MM

Well I wanted something that was a direct bolt in. Plus 90mm on the stock intake mani is overkill without port matching.

Nice write-up, Hoffman.

Thanks! It's nothing special and pretty much anyone could look at it and figure out what to do, but I was super bored so why not

How would you fit a Q45 on that manifold without welding on a new flange.

The smaller is a SR20VE throttle body about the same size as the DE.

I don't think there's any way around welding the flange on

Hoffman5982 wrote:I don't think there's any way around welding the flange on

Correctamundo

Nice writeup, I never even thought about picking up a FWD one to see how close they were...crazyness! The dual pulley option is nice too!

This thread keeps turning up in my searches for installing cruise control in my S14 SR. Figure I can provide a small update.

The P11 (99-02) G20 throttle body bolts up, and the throttle position sensor can be swapped over without an modifications. The S14 TPS plug also plugs into the top connector if you don't want to switch sensors around. The bottom one is for auto trans WOT/Closed switches, leave unplugged.


Here are some pics of a 99 G20 throttle body and my S14 SR20DET throttle body:

P11 left, S14 Right. Notice where the TPS mounts, no gaps like the older versions.



S14 left, P11 right. Essentially identical. I have a 98 Kouki SR, might explain the slight difference in the arms compared to the OP.



P11 left, S14 right. TPS sensors. Use top plug of P11 for a true PnP affair.



Cleaned up P11 TB with S14 TPS installed. Need to fabricate a cable bracket since nothing really lines up anymore.



Installed. On S14 the left coolant line comes strait out, but there's enough hose to connect to P11. One vacuum port, the S14 TB has 2, but one is plugged anyway.



Hope this helps future searchers.