Turbo Selection

[Craving4Boost]

you know it gets a little annoying flipping through to the last page with so many posts. i would rather just read a post thats nice and fresh

[Florida240sx]

[Chezedik]

you know it gets a little annoying flipping through to the last page with so many posts. i would rather just read a post thats nice and fresh

Thank you for the constructiveness of your comment, so I am asking if anyone knows how the T3 ends up working out.

[Jookmasta]

i like my T3. it doesnt give you whiplash like a T4 but it moves. I can hit one bar before 4000 rpms and i spool at around 2000 rpms. I havent taken it to the dyno yet so i cant say much about numbers. there is a guy that did dyno with a str8 T3. his handle is mustang guy i think? or something like that. he posted his dyno sheet so go search for that thread.

[Craving4Boost]

dude im just telling you to start a new fresh topic because no one wants to keep clicking to the last page to see what the last post is. and you know.....asking how well the T3 is....i shouldnt even tell you to start a new topic because this topic is oooooooooooolllddddddddddd.......please search.

if your goals arent that big, it flows well, its cheap, it spools fast, easy to find, and it's fun..but it has it's limit..when your addicted to boost you'll probably get rid of it. search if you wanna get indept with it

[C-Kwik]

Yeah that's pretty much it, it's usually easier for bigger turbos to flow air so they won't make as much heat. But you also have to look at the compressor efficiency and stuff. If you put a large turbo into a really low efficiency and the small turbo at it's peak, you can get the little one to generate less heat. But I'm really new to turbos, so you're better off asking like Ivan or somebody else who has worked on lots of different cars with lots of different turbos. I'm sure he's seen enough dynos to know what really happens and not just what physics and stuff says.

It's not necessarily easier for a larger turbo to flow air. You have to look at the actual amount of airflow at the boost it will be running. The compressor efficiency is a direct representation of the aerodynamics of a compressor assembly. A larger turbo will tend towards moving more air at higher efficiencies, but it is not always better. If you try to run a low amount of boost with too large a turbo and it will be running in a lower efficiency area of the map. Run the same boost on a better matched turbo (perhaps smaller) and you'll be running at a flow rate and boost level that is more aerodynamic. This translates to lower charge temperatures, and will be easier for the turbine to turn. Essentiually, this equates to less backpressure. The turbo that is sized too big will need to try and run a higher pressure differential across the turbine to drive the compressor. Too large can be as bad as running too small from an efficiency standpoint. Only, you'll have a high boost threshold and slow turbo response to go with it.

My point? For best results, decide on the final result you want before picking a turbo. Choose the turbo that best matches your goals. If you have a goal to run varying amounts of boost (i.e. higher boost at tracks with race gas), perhaps you might consider a turbo with a more flexible compressor map. While choosing an ideal turbo onb paper can be easy enough, the real world limits availability of certain turbos and being close may be a good option as well. The difference between the best match and a close match will probably not be measurable from the driver's seat. As soneone already mentioned, you are not building some high tech race car. And if you were, you have a lot to learn about turbos before even considering it.

Finally, Craving4Boost, as far as starting a new thread...if you have nothing constructive to add to this thread, then don't. Personally, I have not been able to post as much as I used to. Seeing the old posts helps me to get a better idea of what was discussed and understand where the thread is going. Not everyone will share your opinions. Simply answering the questions and moving on is easier and more constructive than making some petty complaint.

[Craving4Boost]

i did answer his question about the T3...maybe in simple terms..yet i did tell him to search if he wants to get indept with it. i know i sounded a little rude but if you dont agree with me that a T3 hasnt been asked about plenty of times...then yeah, maybe you really havent been around these forums as much anymore

[C-Kwik]

Your comment wasn't primarily about searching. It was about starting a new thread. Either way, you could have simply answered the question, referred him to the search button nicely, or not responded at all. And I never said that the T3 hasn't been discussed. Given my time here, on the first 240sx mailing list, on FA, and on the socal mailing list, I'd say I've discussed and read plenty about T3's. Doesn't mean it can't be discussed again. And I absolutely do not mind doing so. And given the amount of discussion on this forum alone, trying to search through and find answers to specific questions is not always easy. If you are indeed frustrated at seeing posts over and over again, I think it would be easier to hit the back button than to flame each person who posts a redundant thread. I'll stop now so we can move onto discussing KA-T related topics.

[Chezedik]

Also, C4b, Try to do a search for 'T3','t3 turbo', etc. It says there are too many to display. So although you are right that the answers are there, they will not be displayed. Ironic?, don't ya think.