Baddest small-size T4 turbo out there? Want to upgrade my TC78
09-02-2013, 07:03 AM
#1
Baddest small-size T4 turbo out there? Want to upgrade my TC78 Whatever I read, everyone says TC78 (68mm turbine wheel) is way too small on 383ci. I'm trapping 128mph now at 3950lbs, 14psi boost. I'm sure there's few mph to be had out of my combo but still.
Is there anything that is similar in diameter to TC78? My compressor cover is only 0.5" away from the crank pulley.
I've learned that PT7675 is about 0.6" larger diameter so should fit, but is there anything better nowadays?
Also read that Comp CT 43 and PT8847 are of similar size
Is there anything that is similar in diameter to TC78? My compressor cover is only 0.5" away from the crank pulley.
I've learned that PT7675 is about 0.6" larger diameter so should fit, but is there anything better nowadays?
Also read that Comp CT 43 and PT8847 are of similar size
Last edited by Vetal; 09-02-2013 at 01:08 PM.
09-02-2013, 10:20 AM
#5
I have plenty of hot side space with TC78, it's compressor cover that is 0.5" in front of crank pulley
Damn, I bought TC78 and built pipes for it back when I was M6 and spool was important and 800HP seemed more than enough... This HP bug never stops eating me ))
Damn, I bought TC78 and built pipes for it back when I was M6 and spool was important and 800HP seemed more than enough... This HP bug never stops eating me ))
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09-02-2013, 01:09 PM
#12
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Post pics of how much room you have, any borgwarner turbo can be had in a t4 frame, just run stock cover and small AR to keep size down. A t4 bw in the price range of a pt7675 will kill it in terms of power
09-02-2013, 02:49 PM
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I have been looking at the FP HTA GT4205 journal bearing version. Forced performance makes awesome turbos. This has a 82 or 83mm turbine wheel too. On sale right now as well. I want to try it to do something different.
09-02-2013, 07:49 PM
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I love my PT7675 it spools instantly and I'm more then happy with it. Ill be holding in to it for a long time. My combo works great in my car. If I ever upgrade to something larger ill be doing it in a diff car bc this works too dam good
09-02-2013, 09:41 PM
#18
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Pt7675 is by far the most proven. If you can fit a pt88 that would be great. I run a midsize comp ct5/ct43 hybrid with an 88m comp wheel and 94/88 turbine. Its about the same size as the pt88 and replaced mytc78. Major upgraded, just had to make a 4 inch dp. Back pressure is half of the tc78,made 835whp through locked 4l65e and 9 inch on 19psi.
But if you don't want to mess with anything go pt76/75.
But if you don't want to mess with anything go pt76/75.
09-03-2013, 01:30 AM
#20
Pt7675 is by far the most proven. If you can fit a pt88 that would be great. I run a midsize comp ct5/ct43 hybrid with an 88m comp wheel and 94/88 turbine. Its about the same size as the pt88 and replaced mytc78. Major upgraded, just had to make a 4 inch dp. Back pressure is half of the tc78,made 835whp through locked 4l65e and 9 inch on 19psi.
But if you don't want to mess with anything go pt76/75.
But if you don't want to mess with anything go pt76/75.
itsslow98, still only 75mm turbo wheel...