Ok I'm going to try this again. What turbos work best for a powerband between 6k-10k rpms? I don't want anything other than information on the turbo. Not anything else no build anything, budget, no hp goals, no ecu stuff, injectors or anything else just turbo only!!! My build doesn't matter nor what is on my car. I purely want turbo information. I will say this again I don't care about how much hp it will make because it is irrelevant to my question. What the car is going to be used for is irrelevant and so is anything not pertaining to the turbo. I only want turbo specific information.

 

your last thread was filled with information about turbos and trims, exactly the title you put on it

i think this thread should be closed and you no further waste our time with your bad attitude

 

I don't have a bad attitude. Yes there was information in the last thread however it wasn't related to want I actually wanted to know. That's why I closed it. I felt I needed to be more clear to get the information I require. That is why I started a new thread. I'm not trying to waste anyone's time nor my own. I just need specific information. If you feel like that makes me have a bad attitude I apologize.

 

I would call a fast rotary drag race shop and ask.

One of the fastest I can think of off hand is Pac Performance.

They offer the GTX5018R

GARRETT GTX5018R TURBOCHARGER | Products Pac Performance

87.8mm Comp Inducer, 117.60mm Comp Exducer
98.90mm Turbine
Ball Bearing
Oil & Water Cooled
T6 .96, 1.08, 1.23 A/R Exhaust Housing options

V8 guys are using two of these, you might want to look into that option.

 

Thanks Blue TII. I will give it a look it appears to be in the right size too bad it doesn't have a flow chart. My biggest worry is the turbo spooling too soon and be useless after 8500 rpm. Ideally I'm looking to start coming into boost roughly at 6k rpm so I can maximize the use of the higher rpms. In my other thread someone mentioned the 60-1 compressors which is actually what I was originally planning on, until I was warned that if the turbo isn't large enough it will actually cause the car to loose power and it will shorten the turbo life. However im sure that garrett is plenty big enough.

 

You are frustrated because you don't understand how turbos work. The airflow rate of the engine drives the turbine, not the engine rpm. The airflow rate is based on many factors, such as the intake air pressure and temperature, manifold absolute pressure (boost level), volumetric efficiency (porting) of the engine, thermal efficiency of the turbo and intercooler, engine rpm, etc. Therefore, the engine needs to be built as a complete system if you want it to work well.

In other words, nobody is giving you the answer that you think that you need because your question is absurd.

See this link if you want to know how to pick a turbo based on numbers rather than experience. Rotary engines fire their entire rated displacement per rpm as opposed to a typical 4-stroke piston engine firing only half, so remove the 2 from the denominator of the flow rate equation.
Turbocharger Compressor Calculations

 

That is actually extremely helpful! Thank you very much!

 

Since you closed your Old thread I DELETED it,since you feel all the info posted for you was irrelevant to your Question...your loss.
In the Future DO NOT CLOSE Threads.IF there is INFO up then it will stay..You are not the only one that would read the info.Once posted it is the property of ALL members..
(I just deleted to prove a point about double posting..seeing you didn't care about any answers)
Make sure your question is specific as it can be and provide adequate info on what you are inquiring about.

Now thread answer:
I slapped in a great turbo,capable of 600 hp..spool at 5k..
Can I use it?NO..I do not have the supporting mods and tuning on the engine.So if you are looking at what can do what,then you need all the other pieces to combine to allow that 5-9K turbo to spool to produce power.
Otherwise you got a shiney snail looking thing sitting in your engine bay that does absolutely nothing.

Check out the Single Turbo Section as there is a wealth of info on Specs of turbos.
Follow any info that Howard or Turblown has to say..(it gets quite detailed)

 

All I wanted was a simple answer. I am frustrated because it's seems like pulling teeth to get an answer without listing every single one of my parts. The engine just finished getting rebuild on Saturday. It's not stock it was completely balanced. It's has upgraded seals and ported (intake and exhaust). Originally I was going to keep it n/a however it will not draw enough air on its own to run properly after 9k rpm. I'm not trying to run crazy high boost or anything like that. I'm not aiming for a certain hp. I just want to finish building my car. What I end up with I end up with. I just wanted to know what will work for running in this rpm range. Blue T2's formula helped a lot. I will also check into the single turbo thread thanks for the direction

 

Thats the thing though, when your dealing with a turbo there is no "simple" answer, there are so many factors you have to account for and how your engine is built defines many of the factors.

You just slap any turbo on without really doing the research, it will either a) not do anything, b) by some chance get lucky and its just right or c) its to much and you blow the engine, thats why the flak is being given, we've been there, and we've learned the hard way. Rebuilding these engines isn't cheap, and we know that, thats why we are asking these questions.

The best way to put it, is learn from other peoples mistakes, thats why this forum is here, we ***** it up, we say it on here so in the future, other people can learn from it


Man, that was alot to type on a phone lol

 

As Iduley's sore digits state..(you need voice to text,,heh!)..
There really is no easy answer.
It is compounded by all parts working together in Harmony...(I'd like to teach the world to sing...Woops ..sorry..got carried away..lol!)
It's a whole different ball game compared to slapping on a Fart can and gaining 10 hp on a Rice engine.
Each part has different characteristics and the only way that you can make them work is together,not one piece at at time.
My Suggestion about the Single turbo section is actually What I used to build my car.Along with the Build section and looking at what others ran and read as a good working setup.
I mimicked those ideas and I got what I have now.

That Big *** turbo needs the support of it's other necessary parts and without it the darn thing is just another Piece of Bling.
It won't even do what you want it to do,even though it boasts of spooling nicely at "*" K.
It may spool but is it gonna produce any power?Will it overwhelm everything and go Boom?..That and many more questions arise because you are not supporting the Turbo with what it needs in order to have the engine in it's comfort zone.(that is not Blowing up!)

I'm learning as I go too,so Don't feel bad if it isn't exactly what you want to hear.
The difference with you is that you are asking..I just though I knew better..(don't do what I did..I know Better..NOW!)

 

I hear where your coming from but its all good. I called the shop and they are going to make a list of turbos that will work with my setup. Once the car is done I will post up some dyno and my build specifics. Thanks again guys for helping.

 

I think the problem most of us is having is that we actually understand the concepts of thermodynamics, while you don't even come close.
You tell us your engine runs out of it's airflow effective range well before 9000 RPM, then ask for a turbo that can produce efficient power to 10K?
Volumetric efficiency is a constant. Asking for a turbo to alter the built engine's powerband is idocy.

 

Umm no I am running out of air after 9k rpm not well before it. The engine can only pull in so much air without forced induction. So I'm not sure what your trying to say. Also people use turbos to alter the powerbands on a daily basis. Anyway I have all I need. I just think you guys are making it more complicated than needed. The guy I talked to from aspec instantly understood what I was trying to do and emailed me a list of turbos within the hour. So it's probably my fault for not asking the right way but I didn't ask anyone if it would work or how it would work so Idk why yall are focusing on that rather then the question asked. However I have all I need now so thanks for the people who tried to help.

 

On a wastegated turbo (set boost pressure) the horsepower/airflow will still follow the engines volumetric efficiency if the turbo compressor or exhaust side doesn't limit flow before that.

But, since you just stated you want a powerband of 6-10,000rpm I would recommend a huge turbo (or two) and no wastegate or a very small wastegate at a bad angle for flow so you have a progressive increase in boost with rpm past where the engine's natural volumetric efficiency drops off.

Basically, you have to design in boost creep if you want to try to prop up the powerband past 9,000rpm on your engine.

You are basically giving up huge amounts of useable power by not running your peak boost all the way through the powerband with a proper wastegated turbo, but it will get you the powerband you want.



A proper set up like ErnieT's Semi-p-port GT42R (above) will give you more power under the curve, but as you can see its *just* 5-9,000rpm powerband.

 

It's all good if we can't get it running in the 10k range. I'm just going to run the **** out of it til it blows up and try again.

 

Why are you so hung up on spinning to 10k. I always thought part of the benefit of going to a turbo setup was the ability to make good power without spinning to the moon. I understand you built the engine to take it but it seems that just because it can doesn't mean you have too. A lot of stresses on the engine at those rpms that could be lessened by sizing your turbo for lower rpm power. 4k - 8k sounds like a good spread and if it didn't drop off too bad you've got that over rev range if you need to hold the gear longer for some reason. Just curious. I'd like to know how this turns out. Good luck.

 

If you run it over 8500rpm without the proper modifications and safety equipment, it is very likely to cut off your legs if it blows. Who built this engine?

Also, I hope you realize that horsepower is a function of rpm. A typical 13B engine that is designed and built to operate in the 8,000 to 10,000rpm range will produce over 300hp without any boost. The drivetrain and fuel system of a non-turbo car can't handle this level, let alone any additional power from turbocharging. I realize that you don't think that hp is important, but it makes a big difference if you intend to actually drive the car rather than simply put the engine on a pedestal in your living room. Contacting A-Spec is a great idea, but they can't help you choose a turbo if you don't know what kind of engine you have, or what kind of power level the fuel system and drivetrain can support.

Which type of porting does the engine have?
Mazdarotary.net - Porting

If you truly believe that, then you are far and away the most stupid person ever to visit this forum.

 

 

You may be limited in RPM due to the speed of sound, even with a compressor and all other supporting mods.