rs_1101

what would you do. ive got an 86 n/a.
im either planning to do a complete rebuilt turbo swap, or could i get away with rebuilding my current motor and strapping on a turbo?
what would you do?
can i convert to turbo reliably, and moreover, would it work any betteR? i know the s5 turbo has similar compression #'s to the s4 na. what would i have to do to make the n/a to turbo conv. work somewhat reliably.?

ddub

Search... Read the FAQ, there are links in it about this, there way too many threads every single week about this exact subject (Turbo-N/A) as well as turbo swaps.

rs_1101

so.. theres no way to fit the stock turbo parts in there? i heard the manifold bolts up.
consider the motor will be apart for the install. cant i install s4 t2 parts in there? why wouldnt they fit?
what would i have to change on the block to make them fit?

ddub

Did I say that? I said search, because every single question you've asked has been covered numerous times. I have the answers but I'm not going to give them to you because YOU should be the one figuring this out because of how much it's been covered.

RETed

Are you willing to buy an upgrade clutch?
Are you willing to spend several hundred more dollars on top of the rebuild price to make it turbo?

Zenki NA CR = 9.4:1
Kouki turbo CR = 9.0:1

Yes, the numbers are close, but it means you'll have to run premium octane gasoline just to be safe.
A front-mount intercooler would be highly recommended, and that tacks on several hundred more dollars onto the spending budget.

All these guys that are claiming the turbo lower intake manifold bolts on do some serious metal grinding.
Are you prepared to do this?
It does work, but this is not the best option, IMNSHO, because of the loss of intake velocity from the transition.

Then, you'll need at least a turbo ECU and modify your main engine harness.
Are you capable of doing that?
If you go with the turbo ECU, you'll need a turbo pressure sensor at the same time.

The other option is to go with a rising rate FPR, which costs several hundred more dollars, and you need to adjust it so the car doesn't kill itself or waste gas and bog due to the overly rich condition.


-Ted

rs_1101

you cant scare me off that easily!! :-D
i know about the clutch. my plan was pretty much to be able to just buy everything that a turbo uses except the shortblock. what parts on the block wont match up (besides the useless 5th/6th ports)? midplate, housings? it was my understanding that the blocks were very very similar. im reading up on this right now, but im finding information slowly as opposed to quickly.

RETed

You're better off getting a "spacer" made to just bolt the turbo and turbo exhaust manifold to fit.
No dicking with matchporting lower intake manifolds...

The intercooler is a big concern.
FMIC is "easiest" due to the NA throttle body and intake manifold configuration.

Then, the ECU control of the engine is a big concern.
I'd go stand-alone, but not everyone can go this route.

Fuel pump needs to be replaced and upgraded.

Fuel injectors might need to be upgraded depending on what path you take in terms of engine control.

Exhaust, or at least a downpipe, needs to be fabricated - unless someone offers a pre-made part for this purpose?

AFM's are different between NA and turbo, so this would "require" a turbo AFM if you're going with the turbo ECU.


-Ted

Aaron Cake

iTrader: (1)

This has been covered hundreds of times before. All this and more is available in the FAQ and via the search.

Edit...I'm not closing this thread immediately because it looks like it could turn into something useful. But if it becomes just another turbo-NA thread, then it's gone.

FC3S.USD

iTrader: (2)

Sounds like over kill, but everything stated is true.

You have to set a goal. TURBO or NA. Both are fun . rebuilt NA will give you years of fun with a street port.

If you want to go turbo. EASIEST way is just drop in a jspec motor. But its not as easy as ABC, you need to get still pump/ afm/ ecu / pressure sensor/ driveshaft / rear end.

Wich will add up to ALOT OF $$$

best thing to do is

A) rebuild your NA motor and get it street ported . FUN!!

B) buy a TURBO FC

This is comming from a guy that did a GXL to GTR swap having the whole front clip in my front yard. Sounds plug and play but even having all the parts Still was a GOOD job getting the wiring to match up.

rs_1101

so heres a good question based off of observation:

which is more work.
making the turbo manifold fit so i can use a TMIC setup/turbo TB
or using the spacer and having to go FMIC and use custom everything..?

im good friends with an exhaust shop so a custom DP should be no problem.
engine stuff: first off is there any chance that the stock injectors would be able to hold out with 6-8lbs of boost?

at this point im pretty sure im going to be building this motor while the current ones still in the car, and im trying to do a cracked out junkyard 'mix 'n' match' project. a honda owner would call it frankenstein. could i use s5 turbo rotors with s4 housings? would s5 turbo rotors even match up to the intermediate housings?

RETed

It depends on your skill and resources.
Most times running a spacer and going FMIC is the easier route.

The stock injcetors are not safe for that much boost unless you raise the fuel rail pressure.


Rotor and rotor housings are all the same dimensions, so they are all swappable.
BUT, you need to worry about counterweights if you're going to change years.


-Ted