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.
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!!!
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??
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...
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...
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...
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.
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.
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
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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