Here is my setup:
1990 TII Engine
680CC Primary Injectors
1600CC Secondary Injectors
NPR Subaru FMIC
Haltech E6K computer

Now with my limited knowledge and research on turbos, I found that T04e would be the best choice for my application (road racing and autox).
I want around 350-400RWHP and want to minimize the lag. I have no clue what kind of trim i have to use or how to calculate the intake/exhaust ratio.

So it would help a lot if you guys give some numbers or some info on how i would be able to calculate these numbers.

Thanks,
Omid

 

What kinda turbo exhaust manifold are you planning to run?&nbsp It makes a big difference on collected versus divided on turbine A/R recommendations.


-Ted

 

HKS Cast manifold with external wastegate

 

HKS makes both a divided and collected cast versions.&nbsp I know they list "internal" and "external" WG versions, but this doesn't make any sense.&nbsp Both of them are external, but the big difference is divided versus collected.&nbsp How much did you pay for it?


-Ted

 

The HKS FC manifold is collected, about $300 retail. The FD cast manifold is divided, but I don't know if it will work on an FC with most turbos, about $600 retail.

 

Yea, Jason sells the HKS cast for $250, standard wastegate 40mm wastegate for $345 , To4e for around $850, Oil lines and fittings for $100 Custom made downpipe for $150 if that. Thats a cheap and reliable single turbo setup Thats how I like it less than 2K!!

 

it's collected

 

That's the idea. Screw all of the $5K crap from a few years ago.

 

bump

 

It makes perfect sense, one version is for an internal wastegate like the stock TII turbo's, one is for an external wastegate which allows you to choose what size and brand of wastegate to use. Both HKS FC manifolds are undivided..
Like someone else said the divided are the FD ones..Max

 

I know that, doing back to original question, what kind of ratios I need for the turbo OR do you guys have a site i can go to and find out how to calculate the numbers and what kind of trim to get.

 

I dunno what's the big deal about FC versus FD aftermarket turbo manifolds.&nbsp Anything that will fit an FD WILL fit on an FC.&nbsp This is not the case vice versa.


-Ted

 

Well not exactly, i believe the fd engine is a little bit shorter, so you cannot interchange between the two engines.

 

Yeah, a friend of mine was using a TII turbo on his FD motor for a while. The only issue I have ever seen is the FD lower intake manifold allowing a little more clearance than the FC lower intake manifold.

 

thanks guys for whoring the post

 

Both engines are the same length.
13B = 13B

FD Upper Intake Manifolds do not bolt up to FC lower intake manifolds without modifications. Is this what you meant?

 

i thought I read somewhere that the plate between the housings in the FD is smaller or larger, don't know which one, that' why it makes the overall length of the engine different; hence you can't bolt the ex. manifold from a fd to fc or viceversa

But then again i don't have the best memory

 

Well since no one else has spit some #'s out at you I'll give it a shot....
My goals are about the same as yours and here is what I've pretty much come up with for a turbo.
60-1 compressor
.6 (maybe .7) compressor housing, depending where you want your powerband
p-trim turbine
.84 turbine housing maybe a 1.00 (again depending where you want your powerband)

Another thing you need to consider is your exhaust manifold, what are you going to run? If it's going to be a devided one then I'd say either the .84 or 1.00 (those are devided turbine housings) but if it's a non devided exh manifold I'd say .81 or .96 (non devided turbine housings)

anyone dissagre?

 

You have officially showed you have no idea what you're talking about.


-Ted

 

Yeah i don't know that much about turbos or FD, i just thought i heard it somewhere before. That's why i'm asking this question and I have no idea why you brought up the idea that manifolds are same on FD and FC, was that any part of my question??????