smcmr2

iTrader: (2)

I am going with a hybrid setup and was hoping someone else has done this so I could get their input.

I am getting my REW rebuilt, so I figured now would be the time to port up the sweet RE intake to the REW side irons. Aside from the aesthetic appeal, I am looking forward to the torque gains I will find with the larger/longer intake runners. I was putting 413 rwhp down before loosing compression on the rear rotor. My target is 500 this time. We will be using 3mm Apex seals and other reliability mods this go around. I am considering extrude honing the intake and doing a big bore on the throttle body secondaries. Bryan at Rotorsports Racing in North Carolina is doing the work for me.

Any input (good or bad) will be appreciated!!

papsmagu

iTrader: (19)

first you should search before you get flammed.. upon searching you will find jspecracer7 outlined it for everyone back in 2001

The 2 hardest things to do are: Throttle cable and TPS. Everything else is pretty much cake.

You'll need these parts:

1. Cosmo 13B LIM
2. Cosmo 13B UIM
3. Cosmo 20B throttle body
4. Cosmo 13B aluminum elbow
5. Cosmo 13B LIM/Engine gasket
6. Cosmo 13B LIM/UIM gasket
7. Cosmo 13B UIM/throttle body gasket

You'll need to port match your 13B-rew engine to the cosmo 13b intake runner size since they're quite different....that is unless you want to makes LESS HP

Reasons for the 20B throttle body?

1. 13B-rew throttle body bolts up to the cosmo intake...but isn't shaped the same. The cosmo has a small lip on the bottom(appx. 2 to 3mm) that will allow air to bypass the throttle body and allows air to seep thru.

2. Cosmo 20B is 2mm bigger than stock FD.

3. Cosmo 13B UIM does not have a idle control valve built in like the 13B-rew UIM. The 20B throttle body has one.

4. Cosmo 20B is about 1 to 2 cm longer than the stock FD throttle body. Since the cosmo 13B UIM is shorter than the FD UIM, the 20B throttle body being longer allows the throttle body elbow to clear the oil filler neck.

Basically in a nutshell, you'll need to figure out your fuel needs and how to run your throttle body cable.

You'll need to redo intercooler piping since when I did mine....absolutely NOTHING matched up.

You'll need to swap pins 2 and 4 on the stock FD TPS plug. The FD is a 0 volts to 5 volts TPS. The Cosmo 20B is a 5 volts to 0 volts. Swap pins 2 and 4 and you now have a cosmo 20B with a 0 to 5 volts TPS.

I tried to mix and match FD and cosmo parts...and nothing worked out right. If you do this...just use the Cosmo stuff. Trying to make an FD throttle body work on a cosmo 13B UIM was a PITA for me. I didn't have the time or the resources to make an adapter like Michel did. My conversion was the "poor man's" conversion. In hindsight....knowing what I know now...I could probably do the conversion in about the same time it takes to remove the stock FD intake manifolds.

Also, Please don't PM me guys. Post your questions on this thread so I can answer them all at once and not individually.

lastly there are some different options available to us now that we are in 2010. for example, the 20B TB that he had to use can be supplemented with the Rotary Works aluminum 20B TB. it has the TPS Sensor on the fire wall side and the cable on the opposite side. this should make your install a bit easier.

happy wrenching!!!!!