Rotaryman88

Hey...I'll try to be a little more helpful for you, because we are planning on turboing an NA '91 coupe later on...and the payoff is better then what you'll get from a stock jspec swap...here's my 2 cents so far:



You'll need a stock turbo/manifold from an s5 or s4(go s5 though = better). Then buy a spacer manifold from racing beat(i think) that moves the turbo manifold out about an inch because the turbo manifold won't clear the NA lower intake manifold. You'll need to drill into the oilpan for a return. The rest of the plumbing is pretty much custom..you'll need a pipe to from the turbo to the TB, or IC depending on what your doing. The stock NA block can put up w/ a steady 6psi w/ good tuning. The better part of turboing an NA opposed to swapping the jspec is that you don't deal w/ the messy wiring harness swap and misc parts...turboing the NA will work w/ your existing harness, you'll just need to get larger T2 injectors and an S-AFC or similar...of course swapping to a T2 driveline will be a good idea too as the stock NA s5 tranny is normally only good for 250hp....so far this is all I've come up w/ for we do this project..it's really not that hard, and no you won't get AS much power as you probably would from the 4port motor...but hey..you'll be dif, lol...



Used turbo/manifold = $250 to $450

T2 tranny = $200

T2 driveshaft = $100

custom plumbing = $200(it'll be a lil creative)

bov = $50 to $250(depends on what you use)

misc parts/fittings = $100



so about $1300 to $1600 to turbo an NA w/ the tuning equip on a stock motor @ 6psi(NA compression) should be about 215rwhp provided you have free flowing exhaust, etc...



jspec swap = $1000 for the motor, $100 for tranny..etc...about the same price if you do the work yourself..but your only looking at maybe 190rwhp @ stock boost..



NOW DONT GO FLAMING ME...this is all my theory on it...and your alls may vary...but hey..he asked what he needed for an NA turbo kit, not what he should w/ his car...



hope i helped...

Racer X

You also forgot to mention he will need t2 tranny mounts as well.Just remember that anything past 6psi and kiss the apexs goodbye.

Rotaryman88

I don't remember what that aaroncake guy from back in the day was running on his NA motor..i'm pretty sure it was 5 or 6psi and the only thing that went wrong eventually was that his tranny gave out(stock s4 na tranny)...



but if your rebuilding the motor anyways..go 3mm seals and s4 t2 rotors, etc...you could boost more then...

Racer X

Or use 84-85 SE rotors for a better response.I hear thats what alot of T2 owners use when building motors for thier car.I guess the compression is just about right.

Seppuku

ok thanks rotaryman, so i can use the stock ecu as long as i get a fuel controller, cool. I already knew i'd need a new tranny from a tII . Now i got to figure out how much this will cost and see how long it will take to do.

'79rx7

Don't forget the Turbo II fuel pump and injectors to back up all the air flow

rotary>piston

juat get a turbo engine, then instead of maxing at 6 psi, you can hit 10 or more relatively easily

Rotaryman88

But 10psi on a T2 engine vs 6psi on an NA engine won't be as much power....

j9fd3s

what about the timing? the na is gonna be really advanced because it doesnt retard under boost. you need to make a manifold spacer, its not an off the shelf thing. it might be less hassle to make a custom manifold and get a larger turbo (full to4). also if you swap to a turbo front cover that will give you the oil drain for the turbo. you also will have to make intercooler pipes, no off the shelf kits will fit.



mike

Turbo II

it all depends how much work ya wanna put into it. u can do it the hard way like rotaryman and 1revvin7 or the easier way and buy a jspec. hey 1revving and rotaryman, ur still working on ur na projects right?