Which Housing

[rn240sx]

I have the .48 back side housing now and its way too small as we all know but i purchased this kit over 3 yrs ago.. long story..Anyways, which would best fit the ka motor.. the 63 or 82 housing..??How much lag will the 82 have..??

[j-z]

is your 240 your DD? if so, id stick with the .63 i have a .63 a/r t3/ to4e 50 trim, so once shes all broke in ill take you for a ride just so you can see the difference. alright, back to work!

[rn240sx]

is your 240 your DD? if so, id stick with the .63 i have a .63 a/r t3/ to4e 50 trim, so once shes all broke in ill take you for a ride just so you can see the difference. alright, back to work!

No its not my daily driver.

[hannibal]

Well do you use the car for? Weekend cruising, autoX, or drag??The bigger housing would be better for drag IMO. It allows you to launch without building much boost, and should hit pretty hard once it spools. I think the 0.63 is better for the other two situations.

[rn240sx]

Well do you use the car for? Weekend cruising, autoX, or drag??The bigger housing would be better for drag IMO. It allows you to launch without building much boost, and should hit pretty hard once it spools. I think the 0.63 is better for the other two situations.

Sat night cruising and street / hwy drag runs... NO autocross. My turbo is perfect right now for low end torque and take off power but hwy top speeds it has no breathe left..!! Its like im at 80mph and i barely tap the throttle and im already at like 5-10 psi boost but its not pulling anymore..!!

[Jookmasta]

what the specs on the current turbo u have?

[rn240sx]

what the specs on the current turbo u have?

Why do u wana buy it..??

[NateDogg]

He's probably trying to help you...since we need to know if it's WORTH UPGRADING.. IE Is this a Super 60? :P

I'm assuming its a T3/T04E. Based on that, you will gain more efficiency by going with a .82 housing while still making boost around 3700rpm. .63 housing would yield boost threshold around 3300rpm but less top end power than .82.

If you are more concerned with highway runs in higher gears I'd go with the .82. If you still want to boost in around town without getting into the 'mid-range' then go with the .63.

[Jookmasta]

ya just wanted to know whether its worth upgrading or if u need to start looking at using a different turbo.............

[rn240sx]

ya just wanted to know whether its worth upgrading or if u need to start looking at using a different turbo.............

Well this was turbo from the Fmax stage 1 turbo kit from 4 yrs ago and the paper said this:T3 turbine .48 a/r housing with T04B H3 Compressor..... thats it.

I was told that this turbo is slightly larger than a stock sr20 T25 turbo...

Is it worth upgrading or what..?? im just looking for 400 whp on pump gas and preferably with under 20 psi....

[hannibal]

AFAIK, a T3/T04B is significantly larger than a T25. The t04B are older designs compared to the T04E, but I think your biggest obstacle is the turbine housing.

[racin-type]

i'm actually thinking about buying a similar turbo to this one.

rn240sx - can you please tell me how it is on the streets? like when does boost start to build 2000rpm and when does it start to fall off 5000rpm? does it fall off hard, or just runs out of steam

So at like 80mph which is about 3000rpm in fifth gear, slight gas will hit 5-10lbs of boost?

Seems like your willing to upgrade and sell this turbo. Please email me, i'm very interested: [email protected]

sorry can't help you in your search as i'm not turbo'd yet.

[lilskyline240]

im also having the same problem.....but im debating on what turbo to get....a t3/to4e .50 trim .48AR or .63 AR.....it will be my DD but i want it to be a weekend racer and take it to the track sometimes....

[C-Kwik]

Honestly guys. If you really need more flow from the turbine, going with the biggest A/R you can find is not always the best option. In fact A/R ratios in the middle range are usually the most ideal A/R's for the turbines. If you need to step up, it might be better to go to a bigger turbine. A small trim T4 turbine would still provide good spool, especially when coupled with a T4 compressor wheel. Big turbos can spool relatively quickly when the compressor and turbine efficiencies are matched so they occur at the same time.

If you really must opt for a t3 turbine(which may be the case if you have a FMAX kit), perhaps look towards a large trim T3 turbine. The Turbonetics Stage 5 T3 has a bigger exducer than a O trim T4. The major diameter is smaller, but should flow well and still provide good spool. Then shoot for a middle of the road .63 A/R. I'd speculate the Stage 5 T3 turbine would be most closely matched to the T4 compressors as to where they are most efficient.

I'd personally opt for the O trim T4 myself if it is possible.

[rn240sx]

rn240sx - can you please tell me how it is on the streets?

Its fast as hell on the street when u stay below like 90 mph. This turbo a has a LOT of torque and low end power, but when u get into the high speed range, the turbo is just out of breathe and has nothing else..

Quote »like when does boost start to build 2000rpm and when does it start to fall off 5000rpm? does it fall off hard, or just runs out of steam[/quote]The boost builds as soon as 2500 rpm and stays till redline. But once i get into 4th gear... it will hit 20 psi but it wont PULL as hard as it pulls at 20 psi in 2nd and 3rd gears... its just out of breathe...

Quote »So at like 80mph which is about 3000rpm in fifth gear, slight gas will hit 5-10lbs of boost?[/quote]Pretty much, at top speeds when u barely hit the throttle, its into boost THAT fast.. But the problem is this back side, this back side is more for like auto-cross. Quick instant power... but top speed 90+.. its just maxed out and has no more power to give...This compressor i have is capable of pushing 400 whp... but this 48 housing wont allow this compressor to push that much air to produce 400 whp while maintaining good efficiency. I had to push this turbo to 25-26 psi to hit 414 whp but that turbo was MAXED out and the boost gauge was jumping back and forth between 25-26 psi trying to hold solid and im sure it was blowing out LOTS of hot air which is not needed and not good..

Quote »Seems like your willing to upgrade and sell this turbo. Please email me, i'm very interested: [email protected][/quote]Im trying to see if i can change out to a 63 housing to make this turbo more reliable and allow me to hit 400 whp without having to push 25 psi..If i cant, then ill me more than happy to sell it to u so that i can buy my GT32 or T3/T04E which will let me hit 400 whp with 20 psi or under..

[lilskyline240]

what i want to know, is there someone here who has tried one with a .48AR and .63AR?? and what one they liked better

[rn240sx]

what i want to know, is there someone here who has tried one with a .48AR and .63AR?? and what one they liked better

Well the theory is this:The 48 is for quick spool and lots of low end power but top end will suffer. and its made for smaller disp motors. Great for auto-cross

The 63 wont have as much low end power as the 48 and spool will be slightly slower than the 48. But when the 48 is running out of breathe, the 63 will still be going.

The 82 is made for top end hp. More lag than the 63. It will have midrange and more top end power. And when the 63 runs dry the 82 keeps going...The 82's are more for very high hp motor's & larger disp motor's...

But with that said, there are a LOT of factors included to make those theory's bend a little...

[lilskyline240]

thanks for the imput man....im thinking about goin with the 63AR just because it will give me a room to grow over my 300whp goal...the 48AR will be at max efficency about a little over that

[racin-type]

ARGGG, i can't decide aaaaaaaaahhhhhh

i need the low end torque, cause even with the good amount of stock torque for our 2.4 liters its still not enough for my tastes and i also drive on the highway ALOT and would like the pull the .63a/r would probably give me.

why can't they make one between the 48 and the 63, like a .55a/r lol.

well rn240sx if you do decide to sell, let me know and if the price is right ...

[wannawangan]

I'd say go for the .63.

[C-Kwik]

Keep in mind that A/R's are secondary to Turbine size and trim. Teh turbine itself will have the greatest influence on teh spool and power properties of the turbo. The A/R is a way to make minor adjustments as there is not practical way to develop a turbine and compressor to be perfect for every application out there.

Another consideration may be the motor itself. Consider that the shape of the torque curve will follow the VE of the motor, for the most part anyways. Every stock KA with turbo will start seeing a drop in torque near redline. A great way to get good top end is to have a cam grind designed to give good VE at the top end. And with a turbo that is matched to be very efficient at the top end where the cam helps airflow, you can really get some nice power. You'll probably lose some response before boost threshold, but with a bit of overlap the turbo can really do some magic when it starts having higher boost pressures than backpressure. Not to mention, it will be a lot easier on the engine than trying to force more air down it's throat.

Also, if you are indeed running a T04B H3 compressor, it's way out of the efficiency range at 20 psi. Being at a higher efficiency range will actually reduce the load on the turbine making it easier to reach and sustain teh boost and allow the turbine to run at a lower backpressure. There is a lot of power to be had there alone.

[rn240sx]

Also, if you are indeed running a T04B H3 compressor, it's way out of the efficiency range at 20 psi. Being at a higher efficiency range will actually reduce the load on the turbine making it easier to reach and sustain teh boost and allow the turbine to run at a lower backpressure. There is a lot of power to be had there alone.

I dont take it past 17 psi anymore. Ive felt the motor at 17 psi, 20, and 22 psi and 17 has the best pull to it. Considering that i was on 100 octane at 20 and 22 psi which may have something to do with it OR not.. but 17 def has the more pull to it..

[C-Kwik]

Well, with more top end power as the desired result, you really need to efficiency of the compressor and turbine occurs. Making gobs of power with relatively low boost requires very good efficiency. This sounds like you're goal.

I'll just say this. You seem to be looking for a quick fix, but based on what you seem to be looking for, I think you'll end up disappointed with the results if all you do is swap to a bigger A/R. Trying to go to a larger A/R will probably be a relatively cheap investment, so instead of looking for validation to try it, I say either pull the trigger and do it, or consider the better option.

And I do say this from experience. The difference between a .58 and a .69 A/R on the On-center T4 I had was hardly noticable. All I am saying is don't expect any miracles...

[racin-type]

alright, hard to have the best of both worlds, i think we all know that.

so C-Kwik you seem knowledgeable about turbos, for someone like me, going for full boost around 3k or so and good top end, not the best top end but good enough for some highway use. What would you recommend? Doesn't have to be a t3/t4 hybrid, what would be the best choice?

how about a t3/t4 57 trim .60 a/r comp housing w/ .48 a/r turbine housing stage 3 wheel?

thanks alot

[C-Kwik]

Generally, you'll want to maximize efficiency as best as possible with considerations made to the response. A 57 trim T4 is a good match, but if you have a choice, the 50 trim would be a better match. A stage 3 will make pretty good power with quick spool. Even moreso with the .48 A/R. But you didn't state a power goal so it's hard to gauge if it will meet your needs. When making decisions on a turbo system, you should really be trying to set more specific goals. You may meet the goals or you may even exceed them, but in planning it out, you need to have some numbers in mind so you can make the calculations that you'll need to make the right decisions. It's easy enough to generalize, but hard top make a really good choice without going through it.

[rn240sx]

We all know the 48 is too small for the ka, and most of these 300+ whp guys are running 63 housing or larger.I think the 82 housing is more for top end. So the best street size housing that will give good take off and good top end would be the 63. But then u would have to find a good compressor to match the power band of the 63 housing..In my case my T04B H3 compressor will not do well with an 82 housing cause when the 82 housing starts to breathe, my compressor is maxed. Im shooting for a new turbo with 63 housing and aiming for 400 whp with 20 psi or less on pump gas and calling it a day..

[Jookmasta]

.63 a/r +2

[C-Kwik]

I'm sorry to have to bring this up again, but A/R means nothing without discussing the turbine wheel itself. Even if we limit the discussion to a T3 turbine, there are SEVERAL T3 turbine trims available. They all have different spool and flow characteristics. The A/R does not take this into account at all. A stage 1 wheel and a stage 5 wheel are going to respond much differently even with the same A/R. In fact, the turbine wheel itself is going to be the bigger factor. A/R is secondary. Saying a .48 A/R is too small for an applications means nothing without knowing what turbine wheel you are referring to.

http://www.turboneticsinc.com/pa_turbwheels.htm

[lilskyline240]

im guessing hes talking about a T3/to4e cuz he bought it with a kit....possibly the JGS kit

[racin-type]

But you didn't state a power goal so it's hard to gauge if it will meet your needs. When making decisions on a turbo system, you should really be trying to set more specific goals. You may meet the goals or you may even exceed them, but in planning it out, you need to have some numbers in mind so you can make the calculations that you'll need to make the right decisions.

I want to make around 300rwhp, just trying to keep it nice and simple and not blow sh*t up.


Modified by racin-type at 6:35 PM 6/7/2006