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Old 12-18-2004, 02:40   #1 (permalink)
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turbo specs for I6

Hi all

Just wondering what your suggestions are for the specifications of a turbo for a 4L.
I would like to know all of the specs on what is around the right size turbo for the I6.

Thanks in advance
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Old 12-18-2004, 04:25   #2 (permalink)
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Re: turbo specs for I6

GT3040... .7 front and 1.06 rear..External 40mm w/g...
Or near those figures..Don't worry about big turbine housing it'll spool around 2500 rpm and have boost way under that!!!
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Old 12-18-2004, 23:12   #3 (permalink)
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Re: turbo specs for I6

so those figures would be .7 a/r turbine and 1.06 a/r compressor turbine?
Does the intake and exhaust diameters mean anything? or aslong as it has around .7 cold and 1.06 hot??
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Old 12-19-2004, 03:13   #4 (permalink)
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Re: turbo specs for I6

Other way round dude.

.7 compressor (cold side)

1.06 turbine (hot side)
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Old 12-19-2004, 05:16   #5 (permalink)
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Re: turbo specs for I6

YES they do but they are generally made to flow to that level..
There are SO many combinations it isn't funny.But the above A.R is about right for a s.o.h.c six..The GT3540 [same A.R] is o/k as well...
They come with various A.R options...
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Old 12-19-2004, 05:42   #6 (permalink)
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Re: turbo specs for I6

Quote:
Originally Posted by ebxr8240
YES they do but they are generally made to flow to that level..
There are SO many combinations it isn't funny.But the above A.R is about right for a s.o.h.c six..The GT3540 [same A.R] is o/k as well...
They come with various A.R options...


Does that mean that with a higher flowing engine like the DOHC 4.0 it would be better with slightly higher A/R ratios?

Is flow rate related to (displacement X revs)?
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Old 12-19-2004, 05:53   #7 (permalink)
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Re: turbo specs for I6

YES especially on exhaust..If exh A.R is too small you'll have issues with boost control. the wastegate cannot keep boost at desired level [under 10 Lb ]..But with 1.06 they spool nice.Still need 45 mm external wastegate though...The lower the boost with decent turbo the bigger wastegate required...
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Old 12-19-2004, 21:15   #8 (permalink)
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Re: turbo specs for I6

Be very careful quoting A/R figures for turbos. They are not generalised values, but specific to a turbo configuration.

For say 1.0 A/R turbine and 0.7A/R compressor, this might sound correct for a T04 or GT series turbo (which it is), but if you change to a T03 or TA45 these figures are completely different. A/R is an aspect ratio very similar to that found on tyres.

Get advice an make sure what you're looking at is indeed what is suitable for your engine combo.

Good luck.
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Old 12-20-2004, 03:48   #9 (permalink)
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Re: turbo specs for I6

On another note, what are some good sites to purchase turbo's from? I would like to know what I'm looking at when i get my EL XR6. It would be good if the site had intercoolers on it aswell.
Any help muchly appreciated.

Cheers
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Old 12-20-2004, 06:03   #10 (permalink)
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Re: turbo specs for I6

http://www.gcg.com.au/default_800x600.htm

These are top guys to purchase from U.S..
http://www.turbomustangs.com/forums/...0&pagenumber=1

Some info ...
Turbo Compressor Stage Turbine Stage
Model Hsg. A/R Wheel Trim Model Wheel Dia Horse Power Comp Flow lbs Hsg. A/R Wheel Trim Wheel Dia
T25 0.82 60 T25 1.56/2.20 260 28 0.64 62 1.64/2.09
GT28 0.60 60 T3 1.83/2.37 320 31 0.64 62 1.64/2.09
GT25 0.60 48 GT35 1.94/2.80 350 39 0.64 76 1.85/2.12
GT25 0.70 48 TO4S 2.09/3.00 390 44 0.64 76 1.85/2.12
GT25 0.70 48 TO4S 2.09/3.00 440 44 0.86 76 1.85/2.12

GT30 0.70 56 TO4S 2.25/3.00 480 55 0.63 84 2.16/2.36
GT30 0.70 56 TO4S 2.25/3.00 510 55 0.82 84 2.16/2.36
GT30 0.70 56 TO4S 2.25/3.00 550 55 1.06 84 2.16/2.36

GT30 0.70 52 TO4S 2.17/3.00 600 50 0.63 84 2.16/2.36
GT30 0.70 52 TO4S 2.17/3.00 600 50 0.82 84 2.16/2.36
GT30 0.70 52 TO4S 2.17/3.00 600 50 1.06 84 2.16/2.36

GT35 0.70 56 GT40 2.41/3.22 700 60 0.63 84 2.45/2.68
GT35 0.70 56 GT40 2.41/3.22 700 60 0.83 84 2.45/2.68
GT35 0.70 56 GT40 2.41/3.22 700 60 1.06 84 2.45/2.68

GT42/45 0.66 52 GT42 2.67/3.70 800 75 1.22 78 3.03/3.43
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.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...
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