whats the difference in these and where/how much to get one rebuilt (t3) thanks

 

Rebuilds are approx $300, T3 has a T3 Turbine wheel and T3 sompressor wheel which is small, T3 has a turbine wheel for quick spool up but has a T4 compressor wheel for more top end pull but the T3 turbine lets it spool good still, T4 is T4 turbine and compressor wheels wil be more laggy but much more power potential as long as you have a motor set up to support it, I will most likely be moving up soon. HTH, I can get you a Brand new T3/T04 for $600 shipped fyi

 

hehe, well theres a little more to it then that... however it does cover the basics

the T3 has a medium sized compressor housing and exhaust housing. Its been rated to around 300hp, however getting 300hp out of a T3 would require some major flow improvement (and volume) for a 4cyl (check out the article in "turbo mag" about reading compressor maps from last/this month?). They're often packaged with either a .48 or .63 trim turbine (exhaust side) the .48 being you better bet for a 2.0L or less. For the compressor side, the wheels that usually come in it are .43, .50, .55, .60 trim compressors. the T3 .60/.63 is what the fords came with.

Now, the T04 (comes in either E or B designs) has basically larger housings. The larger housings allow for much larger trim wheels needed to get power from a large diesel or V8.

Now, the fun part is that you can create a "hybrid" turbo from the exhaust housing of a T3, the center "core" from either (same i believe), and the compressor housing (snail) from the T04. This allows more volume to be compressed at lower pressures (colder temps) with the same energy from the turbine.

The rpms:
the T3 will spool fairly quick, creating more power up front. but w/o optimizing your trims, will run out of power and start super compressing the inlet air by the time you reach your power band peak.
the T3/04 hybrid, if tuned well to your engines volumetric efficiency and expected boost levels will provide the same compression of a full T4 but at about 1/3 the RPM range... what i mean is it will start boosting in your early midrange. if the exhaust side runs out of force at your powerband peak, just put in a larger turbine (but this will move your boost range up in the rpms as well)
the T04 or T4 depending on company, should only be used for drag racing applications only (at least on 4cyl) where you're going to be all out WOT peaking at the redline of the motor anyway. Otherwise it probably wouldnt be very efficient as a "daily driving" turbo.

If you read all that i hope it made _some_ sense. (often times i ramble and have to go back and explain what i was thinking). There is plenty of documentation out there to browse through about how to pick the right turbo and see what factors work best for a particular engine.

 

What tryckjavel said he went into a little more detail that I was too lazy to post andy other info needed just ask. We can get into T series turbos too and compressor maps and how to determine an appropriate turbo per compressor maps which will only get you in the ball field, there are also turbone maps somewhere usually turbo companies have them but turbone sizing is usually trial and error.

 

If you are looking to turbocharge the 240SX, the stock S15 turbo can make up to 300hp. It is ceramic ball-bearing.

 

im looking at putting a T3 that i bought yesterday on the SR20 when it gets here and discard the T25 that it comes with. any ideas for shops where i can take my T3?

 

BTW thanks a million for the info. very useful.

 

OH and skywalker, where could i look at gettin a stock S15 turbo?? thnkx
-Tiki

 

what are your plans for it? Hybrid? compressor upgrade?

Theres quite a few shops that can do mods for you fairly cheap. I would highly recommend a shop that also balances them before sending it back to you. Turbonetics Inc. and Majestic Turbos are two well known turbospecific shops that have done good work in the past. I've started to hear some decline in quality from turbonetics lately, but for what you're looking for they should be able to give you what you need.

for the SR20DE i think you might have good results with a .60/.48 T3 or a .50/.63 T3/04E hybrid. If you dont have a decent oil cooler i'd look at a watercooled turbo. Ball bearing will help it spool faster (maybe 200rpm difference) and keep the power very smooth..... but not necessary and very expensive.

Good luck man

 

The T04B is a popular "backyard" setup for Turbo2 owners. The spool-up isn't bad as long as you have a well matched turbine. On a rotary, anywhere from a .84 to a 1.00 A/R turbine is a good size for the best power range.