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Old 11-17-2000, 04:52 PM   #1
MAX_Scooby
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Join Date: Nov 2000
Location: Austin TX
Post The Best Turbo for my Needs????

This should be an easily debatable question. If I were to purchase a Turbo for my 2001 RS 2.5 coupe; What three turbo's should I look at when I come to make that purchase. I intend on purchasing a turbo and I am looking for something in the way of ease of maintainence, reliability, performance and warranty. After reading the Vinshue/0-60 article I come to realize there are many turbos to pick from.

In terms of performance, I would like to pull 0-60 in the 4's to low 5's, top speed is of minimal importance but I would like to compete with regular friday night cars such as Big Blocks and Honda's in a straight line.

What if any suggestions can people make for me? Answers are always appreciated.
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Old 11-17-2000, 06:19 PM   #2
Rich L
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Post

Well, if you go with any of the kits... stage two or better... you will get that type of performance.
From there, speed becomes addictive and you will have to consider significant costs to further upgrade. Generally speaking, it is relatively easy to upgrade a turbo by changing and upgrading the compresser/turbine. Just look at some Mitsubishi turbos and all the upgrades for them.
But its more complex... because then you must worry about more about fuel management... it becomes critical if you upgrade the turbo. Plus you might lose some drivability with a bigger turbo and more lag.
Personally, I like ball-baring turbos... they minimize turbolag but are very expensive.
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Old 11-18-2000, 12:20 AM   #3
MAX_Scooby
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Post

Well, I have a few more questions then.


a] what is the difference between a 'ball bearing' turbo and the regular bolt-on and furthermore what is the functional difference between the two? I.E. aside from the design what benefits will I recieve with one over the other.

b] between the two type of designs what can I expect to occur with the engine? Will one place more wear and tear on the engine over the other?

c] what other components will I need in order to run the machine most efficiently and effectively? Does one type of turbo require a certain component and the other one does not? You had mentioned that I will need to alter the fuel management system. As I have been reading SCC and following the project Impreza (I understand that the moderator shiv is the owner of this vehicle and writes the articles for the mag) they have essentially decided to rid the car of all the bolt on products in order to maintain the car so as to install one unit that will control the fuel management of the whole car. A "brain" if you will of the engine. Would I need that kind of brain with the regular bolt on versus the ball bearing turbo?

thanks in advanced.
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Old 11-18-2000, 10:10 AM   #4
bluesube
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Post

Keep in mind that the Sube is primarily a well handling car, not a drag car, and that is why most of us bought it. An RS can go fast but will never really be a stop light king, at least while still retaining reliability. If you want go power only then a nitrous system may be a better (and less expensive) choice. I knew when I bought mine that it was a decent accelerating subcompact but the real advantage it had over others was its great handling (and the potential for improving it even more). My first test drive I told my wife I'd give her my SHO (no slouch in acceleration or handling) if I could get the RS and I never regretted that choice!

leo
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Old 11-18-2000, 10:44 AM   #5
MAX_Scooby
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I am completely aware that this car is a great handling car as that too is the reason why I am purchasing it. However there are other great handling cars out there as well. A friend of mine has a DINAN supercharged 97 M3 that does 0-60 in 4.8 seconds and can pull .99 g on the skidpad. I am not interested in racing honda's through the corners I want to beat BMW's, Audi's, Porsche's and SuperCharged Miata's through the curves. Here in Austin there are many porsches to pick from to beat, and I am sorry, a 100,000.00 dollar porsche will whip a non-aspirated but modified Scooby under most any condition aside from offroad. I am not the drag racing type, I just want to make sure that if I meet a porsche I too will have at least 400hp on tap to use however I choose to. (We are talking a few years from now)

[This message has been edited by MAX_Scooby (edited November 18, 2000).]
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Old 11-18-2000, 11:23 AM   #6
jImp
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Post

You might want to consider the new twin turbo kit for the Impreza.


Then add nitrous oxide, strengthen the transmission, and you will have a really fast car.

That will probably put you in the 350-400 hp range, and you will have no trouble dusting Porsches.

Currently the strongest turbo is the Vishnu kit.
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Old 11-18-2000, 04:03 PM   #7
RS ING
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Exclamation

If you want 400hp be ready for all sorts of problems. Don't get me wrong I admire your desire for more power. But when you more then double the power of a factory engine you'll run it many problems and the car won't be all that streetable. I hope that you are the mechanic type.
I have my G60 Corrado which has a supercharger stock from the factroy. I am currently waiting for a larger GT1 charger and I realize that the car won't be an every day car. The car will only have 200hp (it came with 150 at the crank) at the wheels and still more room for more power. After tuning a car to extremes the parts become more fragile and tempermental, in my experance.
I realize that I can't beat every car but for what the car is I can do really good usually beating most cars do to the good handling, low wieght and power curve/gearing. The most important thing is for you to be happy after you build the car. And to do this make certain you develop a plan with a goal long before you get the parts so you can rethink it over and over to make certain you refine it and do it right. My goal was so that everytime I drive my car it brings a to my face. and boy does it.

[This message has been edited by RS ING (edited November 18, 2000).]
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Old 11-18-2000, 07:44 PM   #8
Rich L
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Post

MAX_Scooby,

The funny thing is, with 300hp and a good tranny/clutch your going to be "killer" fast!
Were talking low 4sec 0-60mph.
Let me try to answer some of your questions:

-BB turbos spool up much faster than regular turbos of equal size. The result is less lag. But they are very expensive and some people question their reliability (many people may race around pushing highboost and not take the time to let the turbo to cool down) resulting in a relatively quick turbo death. Some bb turbos require special maintenance "topping off" with synthetic oil after 6,000-10,000 miles (so do your homework when picking a turbo).

As with any mod... a 28psi and 350hp kit will be rougher on the engine (and everything else) than a 5psi 225hp kit. Power output directly effect engine life, particulaly if one intends on using that power. The more you race pushing high boost... the greater the chances of killing the engine.
One must accept those facts and decide what is best for them. (keep in mind... with alot of $$$ you can tune your car to high hp while minimizing damage)
Another general rule is that if you run a 5 psi 225 hp turbo kit... you dont need expensive fuel computers to manage it all. You can get away with mostly stock componants. But there will be limitations in using stock componants as your demands for more hp increase.

Too get 400hp you will need to stregthen engine componants (stronger pistons), increase fuel delivery/capacity (ie: bigger injectors or additional injector), and have a more capable management system (a replacement aftermarket ecu) and even with all this... the 165hp stock engine will last longer.

So good luck. I hope this helped.
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Old 11-18-2000, 08:18 PM   #9
MAX_Scooby
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Location: Austin TX
Thumbs up

I appreciate the input. And yes I do have a long term goal in mind. For now I want the car to be a daily driver with some pep. So for now I am going to work towards the N/A modifications to maximize performance. I am going to first change the tires, change the exhaust and add an intercooler. Then I am going to change the suspension, get new rims and then new tires and brakes.
That way I can definately beat many cars out there. I am debating a NOS system but I do not know if I want to be another one of those honda race boys. We will see. And from there I am going to save money so as to purchase another USED daily driver... maybe a truck or an old Volkswagon GTI. And then I plan on turning my Subaru into my hobby car, my pride and joy.. something like that. I figure that in 4 years I should be able to manage this. I would LOVE to do what
McEldery did to his car. But mine would be a little more flashy. Just a little though.

Again guys thanks for the input. I am already planning the next year of my life around what I would like to do with my car. Thanks.
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Old 11-18-2000, 08:42 PM   #10
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Post

You'll want to find the March - October Sport Compact Car magazine issues and read up. More info on them is at www.sportcompactcarweb.com and you'll want to maybe visit a few manufacturer web sites for companies that sell turbo kits. I have a bunch of searchable links at www.ImprezaRS.com and you can search for "turbo" and "forced induction".

Here is info about the turbo kit I am running. I have a couple of posts at http://www.i-club.com/ubb-files/Foru.../000099-2.html (just posted recently) and at http://www.i-club.com/ubb-files/Foru...ML/000040.html for info about my kit and imprezzions.

I have the JC Sports IHI turbo kit which is a low power but safe kit. With fuel pressure regulator and fuel pump, Air Fuel computer and ignition timing control, it is good for about 230 hp. This IHI is rebuildable as a 260hp compressor for about $500, and twice that will get you an upgrade to a T3 ballbearing turbo. I am strongly considering a programable ECU or at least something similar to the MSD Ignition Timing Master to reduce ignition timing under boost.

Good luck in your search for speed.

Larry www.ImprezaRS.com
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