Right on!

 

No argument there. But what would it take for a mod to set up a post that is filled with these links to discussions. That is what we did and it help alot.

 

Not a bad idea, but you can get alot from searching for Single Turbo.

 

I'm not trying to be a dick, but as you've been a member here for a whopping 2 months, I'm not exactly sure where you get off telling us that the FI forum should be closed. There's a wealth of knowledge here, the fact that you seem to be having trouble comprehending it is not our problem.

 

If you go back threw my post I was very much a supporter of N/A cars. Still am. However reading through the F/I threads give me the information I needed to start my JWT build. Now I didn't have everything perfect but I had an large idea of what I needed and the cost of it.

 

i 100 percent agree with this

 

From my own N/A & F/I Thread:

 

Can you elaborate please. No sarcasm here, I'm just curious to learn about the finer/less known facts about the difference between TT/ST.

 

First thing that comes to my mind is weight. A TT kit has more components that add considerable amount of weight. As we all know weight & heat are our enimes.

 

+1 Reading is your friend..

 

 

Agreed, but if you are just starting out modding your car and don't know anything. Searching for single turbo, everything that contains turbo pops up is a bit overwelming and makes it difficult to find an answer. I am just suggesting, take it or leave it, simple thread with a sticky that has links to common topics to jump start the learning process. Now if some one needs additional information like ideal AFR and timing for a turbo, then they can search for it.

 

There are 124 threads in the F/I section related to single turbos. You're one lazy bastard.

https://my350z.com/forum/search.php?searchid=5181488

 

Of course there are MANY factors involved when sizing a turbo(s) for any particular application, but there are obviously tradeoffs with the decision between the two setups. I'll admit the MAIN factor on our cars is the engine configuration and lack of space for a turbo and routing of piping, not the simple fact that you must run a crossover pipe. Once there are more options for squeezing a larger single turbo and piping into the car (PL ST) there will be a lot more people singing praises of the single turbo setup, I believe.

Another main factor in deciding the spool characteristics of the two properly sized turbo setups (twin vs single) are mass of the center rotating assemby (turbine wheel, compressor wheel, shaft), and the inertia behind the wheel once it is spinning.

Turbos aren't 100% efficient. Two smaller turbine wheels require less exhaust gas energy to spin, but also suffer from having to move overall more massive wheels each which half of the exhaust gas energy. The larger turbine wheel on a single turbo is able to take advantage of the full displacement of the motor, and the complete amount of exhaust gas energy is exerted on one turbine. As you go for more and more power, you will be forced to go with larger turbines on both setups. As you increase sizing on a twin turbo setup, it becomes increasingly less efficient to spin twin turbines each with half the motor's exhaust gas energy. A single turbine is able to take greater advantage of the output of a particular sized motor by utilizing the full amount of exhaust gas energy, and more often through a manifold which allows for higher velocity flow. As you go with larger turbos on both setups, the spool advantage on twin turbos will decrease exponentially unless you add more displacement.

Twin turbos incorperate two smaller turbine wheels which take smaller volumes of air (less energy) to spin, while a larger turbine wheel will move slower but gain more momentum as it moves. This is due to the property of inertia, which means that a larger object will resist movement but gather more momentum as it moves. For this reason the twin turbo setup with the smaller rotating assemblies will spool faster, but the single turbo will be more efficient and spool quicker once it begins moving. Twin turbos will generally have a greater range of efficiency at lower boost while larger singles will enjoy greater efficiency at high boost.

There's also the issue of clearances (gaps in parts/wheel fitment). Turbos are built with the same clearances regardless of size, so with two smaller turbos you have effectively twice the area tolerance which has a greater impact on the efficiency of the turbo setup. A single larger turbo is built with tighter clearances overall compared to it's wheel and housing size. It will be more efficient for this reason as well.

I'm no engineer so that's pretty much it in layman's terms.

That being said, there's really no "right" or "wrong". If you want faster overall spool but less efficient high boost power, go with twins. If you don't really care about spool and want higher boost and power, then go with a single. Of course it's easier said than done on our cars. With little room and a V motor the big single is no easy task.

I hope that all made sense. I typed it out pretty fast.

 

Very informative, thanks Craig, not sure I agree about the momentum part, but interesting nonetheless.

 

That was the answer that I wanted to know since a guy in a performance shop was talking to me after he cleaned my injectors. He said big turbo for top end for fast 1/4 mile times, that is what he wanted and he delt with the lag. You just confirmed to me that this is correct.

 

turbonator?

 

+1k on what taurran stated. if u want a track car get the jwt/greddy/aps wich all see full spooling at around 2500-3200rpms depending on boost level. that's why most track dedicated 350z are tt. now if uwant a highway monster single turbo kit such aS the powerlab is the way to go...spool time might b 3500-4200rpms or even higher but power potential is much greater. I'm a noob as well.... correct me if I'm wrong. I'm sure taurran can clarify.

 

I mist have stated that how many times in this thread and others. The search function is not that great.

 

Lol funny thing is when I say closed I mean no more questions to be asked. Its more of a storage area. Look at what myself, damojo2003, and Black Guy have stated in these past few postings. We all agree that there is a ton of information but the search is horrible, and there is no way to find this information. Have you tried to search "single turbo"? And then look for one that says why people choose that over a dual. You seem to point the finger at me yet look around...