farnell121

I have an '86 RX-7, N/A; and have a front clip of a '91 FC3S Turbo II.

The '86 has the engine and transmission removed. The '91 engine is all broken down and laid out ready to put back together.

The parts I have for the rebuild are:

- Complete rebuild kit from Atkins Rotary, with all the cryogenically treated parts
- Rotary Aviation Super Seals
- Turblown Engine Studs
- Pineapple Racing Porting diagram w/ bridgeport

Recently, I tried doing a bridgeport on the front iron, and believe I cut the bridge too thin, so I ordered another front iron which should be coming in this Wed., courtesy of Adialup86! (Gonna have a machine shop do my next port job!) Which brings me to my first question (which by searching I have mixed results): Should I even do a bridgeport on a stock ECU, or even a half bridge if I may get an upgraded ECU in the future? Also, whats the strongest port I can safely achieve on a stock ECU?

Secondly, let's suppose I can come up with roughly $1k within the next few months; what upgrades should I do in that price range, either waiting to assemble the engine or building the engine and adding them on later?

I would be happy getting close to 230-250hp, but I am extremely anxious to get this thing built!

And again in relation to the ECU and bridgeport, whats the cheapest ECU I could buy that would safely allow bridgeporting or more than a mild port job? Thanks!

(Side question: Can I use the N/A transmission or should the JDM transmission be fine? Not familiar with right hand drive cars or their transmissions, would the shifting be reversed?)

farnell121

Also, I've read a little bit about 6port turbo motors, would using the irons off my N/A be worthwile in anyway or just don't even think about them? Thanks.

diabolical1

iTrader: (3)

you're not being clear about your overall plans (or maybe i'm just a little dense) ...

you mentioned that you have a front clip from a '91 T2, which should mean you basically have everything forward of the A-pillars - possibly even the ECU (as they are sometimes included). right? yet your questions revolved around bridgeporting and 230-250 hp ...

so are you planning as running the T2 engine with it's turbo or are you planning on running it N/A?

for 250 hp with the turbo, you don't NEED to do anything to engine other than have it built with good parts. the stock ports will be good enough to get you well above the 250 you want. you can get the extra horsepower with bolt on items and, at most, maybe a slightly modified turbo. if you absolutely must port the engine, then you should not go bridge, just do a streetport.

for 250 hp without the turbo, then yes, you will NEED to port it in one form or another. streetporting can get you close and it will be a harder road, but bridgeporting will get you there quicker and somewhat easier. stock ECUs can handle either, it's probably not the road you should take with a bridgey, but it has been done enough times. at your level, someone else is likely to be involved whether you do OEM or aftermarket EMS.

while both transmissions bolt up to the engine the same, it's not just as simply as running the T2 tranny. the flywheels, starters and everything after the tail housing are different. you can run the N/A tranny for the sake of simplicity until you put together an actual T2 driveline - of course, you'll have to get a flywheel to do so though.