Rx7Convert

Ok, so I'm running a 91' N/A convertible right now. I plan on rebuilding it eventually, but I am trying to figure out what I'll need for an engine swap.

If I drop an 88-91 turbo in it, preferably a TII engine, what all am I going to need to replace?

I know I'll need these at least:
-Turbo intercooler
-ECU/Computer for turbo
-New intake/outake exhaust manifolds
-New Gaskets
-New Cat converter (possibly going to just not have a cat, and run pre-silencers on exhaust since the turbo will quiet it down). I know... it's illegal in OH, but I want less restriction.
-Have a turbo rebuild/refab
-Turbo compatible cat back exhaust system (going to go with a borla)

Also, I know the 91 convertible is heavier than hell, but I still want to rebuild one and lighten it up a little and drop a roll bar on there and have it set up for the track. I just love drop tops, and it looks like a sleeper rx-7, so it would be funny to have a nice looking stock body, maybe just some lower skirts on it that's running a single TII so i could blow the hell out of most everything I see.

arghx

iTrader: (3)

89-91. 88 is S4 and that will be a pain

LunchboxCritter

iTrader: (9)

Get parts from a 89-91 S5 series car.

You'll need:

S5 TII Engine
FMIC or TII hood
TII Transmission
TII Drive Shaft
N370 ECU
TII Rear Differential (S4 or S5, there is some debate as to which is better)
TII Half Shafts
N370 AFM (air flow meter)
N370 Air Pressure Sensor
Boost Gauge
Downpipe (usually included with engine)

If not already equipped with 5 lug hubs and brakes, you prob should upgrade those as well.

That is a short list to get you started. You can use your NA emissions harness on your swap by simply rewiring a couple of the solenoid valve wiring (one for knock, and one for boost sensor/controller). You can skip the boost sensor one, if you opt to use a manual boost controller over the S5 electronic one (what I opted to do).

Tools:
Engine Hoist (cherry picker)
Engine Leveler (not a requirement, but very helpful especially if working alone)
Good set of metric sockets and wrenches (32mm deep socket for rear axle/hub nuts, I believe it's 32mm)
Torque wrench
A pry bar or two
Several cans of PB Blaster (oh whatever you chose to help loosen 20 yr old rusty nuts/bolts)
A friend (to help swap out the rear diff)

Evil Aviator

Basic guide:
http://www.rotaryresurrection.com/2n...to_turbo2.html

The NA drivetrain will handle a mostly-stock TII engine, but you should upgrade to the stronger TII drivetrain if you plan on increasing the horsepower.

BNR offers good service for basic turbo rebuilds and upgrades. A full turbo kit is better than a simple bolt-on hybrid, but it involves much more time and money.
http://bnrsupercars.com/

If you want to go to the extreme, you can just buy this car and save about $20k vs. what it would cost you to build yours to the same level:
https://www.rx7club.com/2nd-generation-rx-7-1986-1992-vehicles-108/fs-20b-powered-convertible-767071/

Rx7Convert

ohhh, now that is nice. Unfortunately... I will just have to build mine, I can't afford anything of that nature right now. Plus... I'd much rather be more proud to have built it and see my work done when I'm finished (not trying to sound pushy).

This will most likely be a 2-4+ year project (unless i start raking money in). I do plan on trying to run a sinlge turbo application with at least 300+ bhp. So I'll definitely need to upgrade my drive axle... along with about $10,000+ worth of other parts. Yeah, this is going to take a long time. I don't know if I can do a 20b swap, I'll probably just stick the TII in there and take it from there.

If I'm correct, the guy on rotary ressurection said he can sell TII engines that have been rebuilt w/ turbos for $2-3k depending on what'd done to them. I'd honestly like to just go that route. My father-in-law is a master mechanic and has done a few RX7 engine swaps with no problems. So.. basically, I could just buy a rebuilt TII engine, swap it. Change my rear end/drive train parts and axle and be good to go. I'll swap for a better turbo later.

Any idea for a full cost estimate on doing the whole drive axle system and rear end suspension?

Evil Aviator

The cost will depend on what kind of deal you can get on the used parts, the condition of the parts, and how much you are willing to rebuild them. For example, if somebody gave you a bunch of crummy old parts for free then you can do the swap for basically nothing if you don't mind driving around with crummy old parts. Were you to rebuild every single part and/or buy new parts then you are looking at well over $3,000.

If money is a big issue then you can just swap the engine and get it running with your current drivetrain, and then swap to the TII drivetrain later so you have time to save up more money and shop for good deals on parts. Your current S5 NA flywheel will work with a S5 TII engine.

LunchboxCritter

iTrader: (9)

Total for me was
$1500 (engine, trans, diff, ton of extra parts)
$350 rear end & axles
$150 for an ecu

So for $2000.00 minus what you can sell some of your good parts that you are replacing for. If your engine was still good I'd say you could get close to $1000.00 of your money back in used parts alone, putting the swap at $1000.00

That's NOT including rebuilding the engine, or turbo. Those two things alone will run you around $2000+. I guess that I got lucky in that the JDM engine swap that I obtained had 110psi all around.