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Thread: Turbo A/R Choices, Damn
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03-02-2009, 11:23 AM #1
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-02-2009, 03:41 PM #2
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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03-02-2009, 03:46 PM #3
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-02-2009, 03:56 PM #4
do you know the specs on them? i only know specs of hx50.
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03-02-2009, 04:27 PM #5
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-02-2009, 05:35 PM #6
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03-02-2009, 05:35 PM #7
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
what specs are you looking for
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03-02-2009, 07:22 PM #8
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-02-2009, 07:22 PM #9
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or would you recomend the .96 t70 with the same compressor
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03-02-2009, 07:23 PM #10
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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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03-03-2009, 07:51 AM #11
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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03-03-2009, 12:02 PM #12
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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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03-03-2009, 01:36 PM #13
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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03-03-2009, 02:02 PM #14
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-03-2009, 03:26 PM #15
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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03-03-2009, 05:02 PM #16
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PBM 366ci TC78 E85- 2004 Pontiac GTO PBM A4
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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03-03-2009, 05:35 PM #17
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03-03-2009, 06:02 PM #18
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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03-03-2009, 06:35 PM #19
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03-03-2009, 06:36 PM #20
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