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turbo specs for I6

3K views 14 replies 6 participants last post by  not ford 
#1 ·
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
 
#2 ·
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!!!
 
#3 ·
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??
 
#5 ·
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...
 
#6 ·
ebxr8240 said:
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)?
 
#7 ·
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...
 
#8 ·
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.
 
#9 ·
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
 
#10 ·
http://www.gcg.com.au/default_800x600.htm

These are top guys to purchase from U.S..
http://www.turbomustangs.com/forums/showthread.php?s=&threadid=24490&perpage=20&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
 
#11 ·
you wouldnt happen to have that in an excel table would you ? :)
 
#12 ·
XDman you have P.M...
 
#13 ·
thanks ebxr. How does the GT35R sound? its rated at 700HP and it has 1.06 A/R turbine and .7 A/R compressor. But is the 50lbs/min too small for a 4l.
Cheers
 
#14 ·
thats just about right dude unless ur planning huge mods u may wana go 1 size larger gt40 etc...
 
#15 ·
50lbs is roughly 500fwhp worth of air. Look for the turbo that will flow you goal fwhp at the boost level you want. Some of the big turbos (e.g GT42R) will flow BIG hp but need at least 2 bar (30psi) to reach that and will be laggy at low boost levels and rpm. Good street compressor wheels are the 60-1, 62-1, and T66, these wheels aren't too laggy and flow good hp (500fwhp+, T66-600fwhp+) and won't expel scorching hot air when the boost is turned up (~15-18psi ,T66~23psi). These are only a few of whats out there.
 
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