XDman

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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ebxr8240

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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XDman

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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FOR SALE: 1980 XD, Recently rebuilt 9" disc diff, with 3.25 gears, toploader with hurst shifter kit, 302C, DBA slotted and cross driled rotors, Fairmont interior with modified centre console, jellybean mags, reasonably good condition, driveline will handle 400+rwhp PM FOR PICS asking $3500

T_Terror

Other way round dude.

.7 compressor (cold side)

1.06 turbine (hot side)

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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...

__________________
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
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...

T_Terror

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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ebxr8240

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...

__________________
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
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...

xhristofer

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.

XDman

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

__________________
HOLDEN
Holes
Oil
Leaks
Dents and;
Engine
Noise


FOR SALE: 1980 XD, Recently rebuilt 9" disc diff, with 3.25 gears, toploader with hurst shifter kit, 302C, DBA slotted and cross driled rotors, Fairmont interior with modified centre console, jellybean mags, reasonably good condition, driveline will handle 400+rwhp PM FOR PICS asking $3500

ebxr8240

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

__________________
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
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...