Campeck

hmmm.
why are the same turbos( T25 ) look different? different compressor housings?

http://cgi.ebay.ca/ws/eBayISAPI.dll?...category=33742

ttwirz

Correct and Correct

You can get aware with neither and no inter cooler with 5 psi. but a 5 psi turbo = pig

Campeck

true that!
8psi! woo!

ok....trim questions. the higher the compressor trim the more it flows? .48 vs .60. which flows more air?

turbine trim. whats the difference here? if the compressor trim is big it makes spool slower right? and if the turbine trim is more it spools it up faster but needs more energy?

Campeck

oh, and how much faster is your NA now?
Hp?

ttwirz

Not really sure in turbo application. The advantage with the SC is that it boosts quicker. My SC car is "quicker" off the line than my 951, however once the turbo is spooled up the 951 has the advantage. Since you are turboing you will have the lag. Ultimately you will have the negatives from both applications. Lag time and lower boost. My CS car is a fun project, unique, eats money and is inefficient. I paid less for my 951 than my SC kit. I am by no means trying to discourage you from your plan just don't be disillusioned on thinking that it is a simple economical process because its not. you will also need some sort of stand alone fuel management to prevent lean running as well since the NA system will not be able compensate for the added boost.

Chris White

Unless you change the ignition timing via a stand alone or other mods you are heading straight to detonation hell....

Chris White

$1k will buy you a bag of used parts that don’t fit.
BTW – the USA NA engines were 9:1 not 10:1 like the rest of the world engines.

Dave951

Here are some informational links regarding Turbochargers that may help clarify some of your questions.

Garret Product Catalog
Turbo Speak 'The Lingo'
Turbo Tech 101

After you've read all that you can take this little quiz and see how much you've learned/know.
Turbo IQ Test

Campeck

chris. 1000 dollars will get me brand new custom pipes and brand new turbo..used injectors...and a good intercooler (used maybe) intercooler.

the chip may be another problem.

ttwirz. how do you manage not going lean? did you get a chip to replace the fuel maps? and retard the timing if it knocks? (did you even get knock sensors?)

Maciek

Campeck,

What happened to the thing you used to have in your signature that used to say something along the lines of "I will build a 200hp NA engine"? Not trying to be argumentative, but I thought you were going to stick with the NA and avoid boost.

Since I am not half as knowledgable as several of the people who posted here, I really don't have much to offer. Good luck, I am all about the custom projects, but you may want to consider just swapping in a 951 engine as this seems to be much easier. I'm not sure if you know who Chris White is, but if he says that you need to change the timing, then I would believe it.

Campeck

hehe.
that is true. turbo is more bang for the buck. so for now im going with that.

in time i probably will try to build the NA monster. but for now this seems like its very likely to work and maybe sell!

i just emailed a guy that sells MANY custom turbo headers for tons of cars for less than $200!!!
I asked him if i could send him a jig to indicate where the ports are...where the headers need to end in a T25 turbo flange and where the frame rail is to tell him where the pipes cannot go!

I really hope he can do this. as this will mean the only things i need is an intercooler, chip, injectors, turbo, and the headers, and a custom peice to connect the turbo to the cat!

Campeck

are these guys serious?
i thought a turbo needs HOT air under load to make boost....

http://ststurbo.com/how_it_works/edit/693/#

Campeck

I also need to know if the T25 is too small!

Im not sure is I will go into the "surge" zones of the other extreme. help?
what if it gets overboosted by the 2.5 L engine?

or does the wastegate cancle all that crap out?

Campeck

and though this is a minivan...it was very helpfull.

http://www.turbominivan.com/tech/turbo201.htm

Campeck

http://www.overboost.com/story.asp?id=1048

this place here.
what is this boost-indexed fuel pressure riser? sounds nifty.
and the things that supposedly tricks the MAP..our cars dont have a MAP.
would I be ok if the AFM was on the non boost side of the intake..thats how it is anyway right?

again. can the oil drain UP? does the oil just dribble down into the pan or is it still pressurized?
will there be a problem if the turbo is below the oil level?

tammons

A t25 is too small. You really want to run a T3. Better yet get someone to build you a custom T3 with a bigger impeller and a clipped turbine wheel. Actually SVO mustangs ran T3 turbos and that one would be a good one for a 944. I had a custom built water cooled T3 built for my SVO and it was nice. The SVO mustangs were 2.3 L cars.

I still say you will save mountains of time and aggravation by starting with a 951 or at least get a wrecked on to scavange the brakes and turbo block out of.