trim selection

[dl240sx]

don't knoe alot about the turbos so what is the trim, flange, A/R housing, and what is the difference in degrees as a 360, 270, what i the difference.

thanks

[IvoryJ30t]

how about asking the questions one at a time and in the form of a complete sentence?

[nikn]

lol. Someone better corect me on this... I can tell u that flange is the part that attaches to the exhaust. Each flange has a specific bolt patern blah blah blah. housing is the case/cartridge that the turbo is in. trim is like turbine wheel size [is it?]. If u increase the size of parts u get more power but also more lag. I think degrees refers to the thrust bearings... i only heard of 360 degree ones. The thrust bearings keeps the turbin from moving back and forth in the housing. I am actually not too sure my self....

[nikn]

cI think these are common flanges: t2 [ for small turbos ], t3 [more common, medium size turbos], t4 [big turbos]

[nikn]

here we go... this is from the faqT3-Super 60 T3 Standard .48/.63 t3 = flange60 = trim.48/.63 =A/R

by the way, what does A/R stand for?

[:: orion ::]

A/R = Aspect Ratio...

Trim is the ratio of the size of the inducer to the exducer of a turbo wheel.

Search on Google, there's lots of GREAT turbo info on the net.

Check out http://www.turbosaturns.net (good site) and some of the GN performance sites...

Learn to read a compressor map...

Etc, etc...

- Brian

[:: orion ::]

Quick google search reveals:

http://minimopar.net/perf/turboinfo.html

- Brian

[dl240sx]

orion thanks for the sites they really do help alot.

thanks

[nikn]

wow i was sooo wrong. so someone tell me ...T3-Super 60 T3 Standard .48/.63 so the super 60 refers to the A/R right???and the .48/.63 coressponds to the exhuaster/inducer right???

[Nathan]

The Super 60 part is referring to the Compressor trim, the T3 .48/.63 is referring to the turbine housing (T3) and the turbine housing's a/r (.48/.63) It actually doesn't say what the compressor's A/R is and I dont know what housing a super 60 compressor uses.

[nikn]

ahhhhh i think i get it. So does the A/R basicly refer to the area inside the housing not taken up by the turbine wheel????

in that case .48 would be the exhuast turbine trim and .63 is the exhuast housing size?

[nikn]

oh wait i'm just getting more confused. The websites all say it differently so confusing [or maybe i'm just challenged?] so trim is...... the size of the wheel? It said somewhere trim is the ratio of the biggest part of the wheel [in terms of diameter] to the smallest part??? BTW i'm searching on the web too so don't go tell me to do that

[:: orion ::]

A/R is basically the housing size - Bigger # = more flow.

Trim is the size of the wheel - Bigger # = more flow.

So you match the trim based on comressor maps and your desired HP/boost level.

The A/R can be changed to affect spool...but for a KA, .63 is pretty good. But turbine wheel stage (stage III, stage V) affects this as well...i.e. a .63 A/R with a stage V wheel will spool slower but have better top end than a stage III of the same A/R.

And for my unrequested but relevant turbo reccomendation:

T3/T04E, 50-trim compressor, .63 A/R - Stage III wheel

Perfect for a KA.

Or even better, one of the new Garrett GT turbos that approximate/replace the T04E 50-trim.

Later - Brian

[nikn]

http://www.st205.net/techinfo/turbasics.htm

i get it all , now that understand what the inducer and exducer actually meant, phew

[Nathan]

T3/T04E, 50-trim compressor, .63 A/R - Stage III wheel = my turbo (on the recommendation of several people from here and my half-assed compressor map reading)

[dl240sx]

nathen how much hp do you exspect when everthing is done?

[Nathan]

Hmmm, I've seen a lot of variation in power from people using T3/T04E's of different varieties but I'm hoping to at least hit 350 at the wheels. Time will tell though I'd be happy with less and I might get more, just dont know. The fuel is there I just dont know if my ebay ic and the 50 trim can keep up, I think they will though.

[dl240sx]

when are you working on your car, would really like to come and see it. whats your fuel setup.

[Nathan]

Hey, it's practically going to be a party at this rate! It's a JWT ecu with a JGY fuel rail feeding MSD style 75# hr. injectors. I'll get the motor back from the machine shop in 2-3 weeks and probably really put everything together over C-Mas break.

[dl240sx]

were is c-mas break? never heard of it. did you do anything to the fuel pump.

[C-Kwik]

Actually, A/R is Area/Radius. The Area refers to the size of the opening(nozzle) where the exhaust air goes through before hitting the turbine blades. The Radius refers to the distance from the center of the turbine to the center of the nozzle. Making the area smaller creates higher velocity gas, but decreases flow. Higher velocity gas will spool a turbo quicker. Changing the radius can have a similar effect as a larger radius will put more leverage over the turbine. But in practice, it is generally the area that is changed for a given turbine/compressor housing. So essentially, the A/R refers to the size of the nozzle(not a direct measurement).

[dl240sx]

nathen i'm a dumb ***, C-mas break, as in the C-mas break like christmas break. not like a shop. ya sometimes i'm not all here, at all, and a little slow.

[Nathan]

Haha, that right there was pretty amusing, I'll hit you up on AIM sometime man

Edit: It's a Walbro 255lph HP, I also have an aeromotive fpr