t3 compressor map

[newbe40]

I need some help finding a compressor map for a t3 it's a tbo 348 and do you think this turbo would work for 300 hp 14lbs of boost ?

[newbe40]

Ok as you may have guessed this t3 is off a grand national and from all info I can get it looks like it may be a good choice for a ka motor. I have done a search and info on this is not very detailed. If anyone has anything they could add it would be appreciated. When I get started on this project I will post the results.

[C-Kwik]

It really depends on your goals. No T3 compressor map I've seen is optimal through redline on a KA. Most are off the map by redline or in the lower efficiency range(65%). It will work, but I don't consider it to be a great choice. If your goal is quick response, then it will be a good choice. But if you want good power and less heat into your intercooler, a larger compressor would be a better choice. A T3/T4 has good response with decent top end. The turbine still chokes this turbo at the top end, but it is minimized by the fact that the compressor is working at much better efficiency in that RPM and boost level than a T3.

[newbe40]

Thank you for that info, you would say its not the best choice but it would work depending on my goals. So I will try to describe what I am looking for, quick controlable boost 12lbs hoping for 270 to 300hp short shifting at 5400 would be ok at that rpm would this turbo still be past its effiency range also would I have any problem with compressor surge?

[Drift Machine]

If you are looking for those kind of numbers, look in the direction of a t3/t4. And why would you want to shift at 5400? As for compressor surge, to my knowledge one turbo isn't effected by it more then another one.

[newbe40]

You have me looking at other choices now what about a t3 super 60 or a gt32 71 compressor and .69 turbine. Could someone please help me with what kind of drivability to expect from these choices, how much lag or will you just loose traction every time you try to accelerate past 2500 to 3500 rpms I hope these questions are not to simple but I have never ridden in a turbo 240sx and with the low rear end gearing and light weight I am a little concerned about traction, not that I don't want to spin the tires I just want to know when its going to happen.I think some back ground on what I have worked on in the past may help I have had a grand national that ran low 12's a 71 nova with a 406 and a 68 ram air 442, I do most all my own work I am new to nissan's and am enjoying reading these forums the people seem to be very helpful and are very good about free exchange of ideas and information,if you have given advice I thank you.

[Def]

T3 super 60's are OK turbos for the KA, but seem to be mismatched(too large of a compressor for turbine IMO). Not sure on a GT32, it would probably make BOATLOADS of power though, and be pretty expensive.

Honestly, for a KA-T, I'd have a VERY hard time going with anything other than a T3/T04E. Go with the 0.63 A/R turbine housing and a 0.50 trim compressor for your power goals. It will spool up pretty nice(maybe full boost by 3500-4000) and be capable of 400+rwhp.

240SX's with a nice limited slip differential and big rear tires(or drag radials if you only go in a straight line:)) have pretty good rear traction in my experience. Once you get into 2nd gear, I'd say you shouldn't have any problem putting down the power level you are talking about, even on good street tires.

[C-Kwik]

Thank you for that info, you would say its not the best choice but it would work depending on my goals. So I will try to describe what I am looking for, quick controlable boost 12lbs hoping for 270 to 300hp short shifting at 5400 would be ok at that rpm would this turbo still be past its effiency range also would I have any problem with compressor surge?

All boost is controllable. If you close the hrottle, the motor wil not see any boost. And do NOT use Gran Turismo as a reference. Most of the race cars on it with huge turbos are entirely unrealistic. Even very large turbos will still have a managable boost curve. You just have to wait untill a high enough RPM before the boost curve starts.

[C-Kwik]

Honestly, for a KA-T, I'd have a VERY hard time going with anything other than a T3/T04E. Go with the 0.63 A/R turbine housing and a 0.50 trim compressor for your power goals. It will spool up pretty nice(maybe full boost by 3500-4000) and be capable of 400+rwhp.

It's 50 Trim, not 0.50 Trim. And a .63 A/R doesn't tell this guy anything about which turbine to use. You must specify what trim turbine wheel as well. And also what A/R compressor housing. Sorry if I am being anal about this(this is the 3rd time I corrected this exact issue this week) but I do not like seeing bad information being continually regurgitated. I'm not picking on you either Def. As I said, I picked on 2 other people for the same reason before you.

But to summarize, to give a proper turbo sizing, you must specify the turbo family(T3, T04 B/E, T3/T4), compressor trim and A/R, and turbine trim and A/R. Some turbos have some other quirks as well, but they are minor and have little to do with the way the turbo works. Those would have more to do with the way it bolts up or connects to piping.