millertime6009

iTrader: (1)

Will this be a clean swap into my 88 n/a since its a JDM?

http://www.osakajdmmotors.com/intromitsubishi.htm

thanks

K!NCH

iTrader: (2)

If it's just the engine, then yes it will bolt up to the n/a transmission.

But if it's engine and transmission, then you will need a TII Driveshaft, TII Half-shafts, and a TII LSD.

93rx74lyfe

iTrader: (1)

Being "JDM" has nothing to do with it working or not.

need RX7

iTrader: (4)

You will need to swap your n/a flywheel and clutch onto the TII motor to do it that way.

Also, keep in mind that JDM motors are a gamble, since many of them show up blown.

millertime6009

iTrader: (1)

I didnt know If mounts were different or anything for JDM.

They offer a 30-day warranty. None of their engines have more than 35k miles.

need RX7

iTrader: (4)

That's what they all say.

millertime6009

iTrader: (1)

true. but assuming it is a reliable engine I can just keep my n/a tranny, drop in the tii, and whatever other parts i need salvage off my working n/a?

need RX7

iTrader: (4)

Yeah, I'm pretty sure.

millertime6009

iTrader: (1)

Ok, Im a newb I know. Im getting completely different responses from different people. Some say I need all TII parts and others say itll drop in. How about this, I buy the TII and take all turbo parts off and put it onto my n/a?(manifold, intercooler, piping, valves, turbo, etc.) Then I have a TII without turbo sitting around for whenever I need parts. Feasible? Any turbo kit I find new is about 3500 dollars so itd be like buying a turbo kit for 1200.

need RX7

iTrader: (4)

It is entirely possible to use a TII motor with n/a drivetrain. You'll need to take your n/a flywheel and clutch (and possibly your counterweight, not sure on that one) and put them on the TII motor, then it will bolt up normally. People will try to tell you the n/a drivetrain is too weak, but Aaron Cake used one with his bridgeport GT40 for a number of years.

As for turboing the n/a block, it is possible, but it's not as simple as just bolting the manifolds up. The turbo motors are 4-port and the n/a's are 6-port, therefore the intake manifolds don't line up. search Aaron Cake's old thread about turboing the n/a block (his current bridgeport motor is actually a 6-port)

EDIT: here, his website has a comprehensive overview of the whole process: http://www.aaroncake.net/rx-7/naturbo.htm

K!NCH

iTrader: (2)

Did he upgrade the clutch or the rear-end at all?

millertime6009

iTrader: (1)

Screw it. Im just gonna rebuild it, port it, and throw an S5 manifold on their. Thatll be fun to drive and have equivalent power to a stock TII.

K!NCH

iTrader: (2)

And not have to worry about a things that can go wrong with a turbo.

How big of a port are you going to do?

millertime6009

iTrader: (1)

Im not knowledgeable on details of porting. I've heard there's a partial and full street port and a bridgeport. Really don't know the difference between them except more power less mpg. Then i see people listing numbers like 700/500 or whatever. Some advice on this would be appreciated.

Chris Boots

A turbo engine swap isn't that big of a headache

If you're gonna port your engine and have never done it before I recommend checking out mazdatrix and just using their templates or something.

So you're seriously looking for 146 to 180-189 hp out of a S4 NA? That would be a pretty big port job (intake and exhaust ports) to see those numbers. An S5 Intake setup doesn't differ in HP numbers that much unless you get the VDI on it working as well. S5 NAs got 160 hp not just from their intake but rather their lighter rotors too.

We did one hell of a port job on an autocross NA RX7 and saw close to 180 hp on the dino but he also had all accessories removed, emissions gone, full racingbeat exhaust setup, Rtek ECU, and lightweight rotor and flywheel. Just saying there's more to getting turbo numbers on an NA than porting or else I think Mazda would have ported all their engines differently in the first place

millertime6009

iTrader: (1)

Im not porting my engine Banzai Racing will be doing it. Ive seen dyno results from an s4 n/a they ported that made 188whp w/ no fuel management. Ive also heard mixed reviews on the S5 intake on S4. Most have said it pulls harder in the higher RPM range.

87 t-66

iTrader: (133)

i think you should just buy it and let us know how it goes. make sure to post pics!

93rx74lyfe

iTrader: (1)

Sorry, your NA isnt going to have power equal to a turbo. If your looking for something fast why didnt you just get a TII in the first place?

millertime6009

iTrader: (1)

Because there were 2 RX7s within 250 miles of me that I could find. Both n/a. Stock S5 turbos have 200 advertised from the factory. So I should be close enough. If I can hit 14's 1/4 Ill be more than pleased.