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Turbo A/R Choices, Damn

This is a discussion on Turbo A/R Choices, Damn within the Forced Induction forums, part of the LSx Technical Help Section category; ok, i have been looking for sometime now, just curious im looking at either a holset hx50 or a master ...

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    Turbo A/R Choices, Damn

    ok, i have been looking for sometime now, just curious im looking at either a holset hx50 or a master power t70 with a .96 a/r. any suggestions on how they will perform with a rear mount setup on ls1 gto a4. just cant seem to find the one a/r that people agree on for good power from 2-5000 rpm. any help would be greatly appreciated.

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    Member side2000's Avatar
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    hx50 would be super super laggy. if you ever got it spooled it would be nasty though. on a stock motor or anything with high compression that turbo would be pointless.

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    ok, with that in mind, what about the t70 with the .96 a/r or would the .71 would be better?

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    do you know the specs on them? i only know specs of hx50.

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    PBM 366ci TC78 E85
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    what r u looking for as far as specs. i can get what you need, actually here you go

    http://cgi.ebay.com/ebaymotors/Maste...3A1|240%3A1318

    or

    http://cgi.ebay.com/ebaymotors/Maste...3A1|240%3A1318

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    PBM 366ci TC78 E85
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    PBM 366ci TC78 E85
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    what specs are you looking for

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    PBM 366ci TC78 E85
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    t70 with
    TURBINE

    Exducer Diameter
    Inducer Diameter
    Trim
    A/R
    Divided or Undivided
    Discharge
    64.5
    74.0
    76
    0.70
    D
    V-BAND
    COMPRESSOR
    Inducer Diameter
    Exducer Diameter
    Trim
    A/R
    Air Inlet
    69.1
    91.0
    58
    0.70
    101.7mm

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    or would you recomend the .96 t70 with the same compressor

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    ill probably end up with the t70 with the .70 a/r both sides. it would seem to provide good midrange power which is what i want. i think it will any way. i been studying on how to read compressor maps. its really not as bad as i thought it would be.

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    personally i would find somethin smaller for a stock motor, for insta spool. you dont need a big turbo for a stock motor since you cant push that much boost anyway. if i was to choose between those i would go with the .96, but seeing as how all 3 have same specs i dunno how that one moves more air. . . .

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    ok, i guess im not sure now what size to go with. ive heard the compressor is right on. but im still not sure, i was told that .96 would take forever to spool. ok. lets just say i went smaller on the hot side and it made its 8 or 9 by 3000rpm would it still carry that 8-9 all the way to the shift or what. i dont know. still trying to get a compressor map for this unit. and a consumption map for my ls1

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    The A/R rate is critical, but not the only thing to consider when setting up your turbo setup. If you're going with a rear mount setup, which I wouldn't suggest, I'd remember this. You want a higher compressor a/r for lower boost applications because this will cause the turbo to get into the power a lot sooner. On the turbine side of the house if you go with a smaller a/r you're basically funneling the exhaust gases to increase the velocity. Go too low and you'll wait forever for your turbo to spool. Also, a t70 isn't too big as someone suggested. You'll have better volumetric efficiency and can always keep the boost turned down. You have a lot more to worry about than A/R ratings...I could go on with trims, compressor maps, ohhhh it goes on and on...lol...

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    PBM 366ci TC78 E85
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    oh, i employ you. please do sir. im all ears for whatever info i can get. and i promise i will listen and not bash.

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    What do you want to do with the car?? Daily driver, street/strip, full race???? How much are you willing to invest?? What kind of HP are you wanting???? Answer those and we can go from there.....

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    daily driver kinda. i drive a company car 5 days a week and only drive the goat on the weekends. i want around 500 +/- 25 hp at the wheels. i have some cash, and not afraid to spend it. but i want to do everything myself. so i will not be buying a kit thats already made. and i want to do a rear mount as i dont not wish to messs with headers or anything under hood. mainly want it to look stock. i will be going to the strip once in awhile not often. maybe a street race somewhere here or there. but mainly something fun for the weekends and reliable.

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    Member cailey37's Avatar
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    Quote Originally Posted by JAX04 View Post
    daily driver kinda. i drive a company car 5 days a week and only drive the goat on the weekends. i want around 500 +/- 25 hp at the wheels. i have some cash, and not afraid to spend it. but i want to do everything myself. so i will not be buying a kit thats already made. and i want to do a rear mount as i dont not wish to messs with headers or anything under hood. mainly want it to look stock. i will be going to the strip once in awhile not often. maybe a street race somewhere here or there. but mainly something fun for the weekends and reliable.
    ok...let me work some info up for you and I'll send it to you.....stay away from those ebay turbos you listed....they are junk

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    i never said t70 is "too big" i said hx50 would be super laggy. . . . .as it would. i personally wouldn't run turbos with those specs on my fact motor, just way too much potential just to be squeezin 6-8 psi out of 'em.

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    Quote Originally Posted by side2000 View Post
    i never said t70 is "too big" i said hx50 would be super laggy. . . . .as it would. i personally wouldn't run turbos with those specs on my fact motor, just way too much potential just to be squeezin 6-8 psi out of 'em.
    oh no, i wasnt reffering to you. im also on the ls1gto forum and they said that. not any of you. sorry for the confusion.

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    Quote Originally Posted by cailey37 View Post
    ok...let me work some info up for you and I'll send it to you.....stay away from those ebay turbos you listed....they are junk
    cool, thanks man

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