first yes i did use search and couldn't find what i was looking for

I'm just remotely curios as to how much boost the s4 or s5 n/a motor would handle in its stock configuration the reason i ask is that i may have an oppurtunity to get a very small turbo from a local junkyard and was thinking of doing a low boost setup from junkyard parts on my 7 the reason i asked about both s4 and s5 is I have both motors to werk with i was thinking that it may handle 5psi am i way off base or what

 

you have any idea how much work and money your gona use to make that work even remotely good?

 

http://www.aaroncake.net/RX-7/naturbo.htm

 

yeah i read aarons page a while ago just went back and looked at it again before i made this post anyways regardless of what anyones personal opinions are what do you think is a safe psi to run an N/A motor on daily

 

I am going to do it too and I figure the whole thing will cost me around $500 or less. It is mainly just a bunch of plumbing issues.

John

 

Very safe just don't run anything smaller than a stock S4 turbo....

Don't get this 'small' turbo from the junkyard thinking it will make less boost and/or be more safe. It Wont!

Running stock boost (5psi) on a s4/5 n/a motor with a stock FC turbo is very reliable..

This small turbo if it makes 5psi will almost definatly be overspinning it stupidly, killing bearing/making more heat... not a good look trust me.

 

the small turbo is a IHI rhb5 and the reason iwas thinking this one is because it spools up very quickly i don't know a great deal about specific turbos but a friend of mine has the same turbo on his car and he found his acceleration was increased dramatically but running low boost he has found very little top end diffrence

 

Does your mate have this IHI rhb5 on a 13b aswell? doesn't sound right to me at all... then again werider things have happened.

Do you know what the exhaust wheel dia. is? and the a/r ratio?

 

You can probably get an s4 turbo for less than that junkyard turbo. S4 is a good option because it's optimized for the 13B and anything with much smaller of a turbine will undoubetedly spin the compressor way too fast. You could even use the twin scroll to help spooling. Only rationale for removing it in the TII's is for high boost.

 

no his is on a lowly piston motor

 

Then it's probably too small.

 

are you planning on running this off a standalone ECU or trying this as a just a bolt up?

 

use the s4 motor. it has the same compression ration as the 12a's. my friend(coldy13) has a 12a turbo setup and he is running about 12 psi no problem. the other day he took it up to 16 psi and it was fine. he probably shouldnt do that too often, but it worked once.

 

You can easily run 12~ psi on NA if you wanted.

 

You could run 20psi if you wanted, but probably not for long. If you plan on using the stock computer, I wouldn't go over a few psi (with an afc). You could probably run higher boost with a standalone, but then it would be pointless to do this on an N/A because the $ involved could be put toward a turbo motor and some mods to make it faster (more reliable) than a turbo N/A.
How old is the engine too? If you start with something bad, you're only going to end up with something worse.

 

yeah i did it too, but it cost me quite a bit more than johnequest ran me about 1800ish cnd after everything was said and done. (the new safc II and blitz BOV really kille dthe price thing) right now running stock boost levels, noticable gain and no ill side effects yet

 

00nothing, how are you planning on running the oil lines to the turbo? What all needs to be run to the turbo anyway. I know you need the turbo exhaust manifold right? And you need to run oil through. Is there anything else?

 

i never said you couldnt

 

Someone need to add a sticky it the top of this 2nd gen page. This has been asked a million time. I have also asked this question. I believe all of us who owns a NA RX7 have asked this question one time or another.

 

Chimeron- For stock turbo you will need coolant and oil lines. The oil feed can be done with some fittings and the fc3s oil pedistal (sp?), oil return is gonna be some custom work. The cooolant can be taken from the lines that run thru the TB. I think it goes over this in aaroncake's site also.