t25 upgrade to t28
#11
Re: t25 upgrade to t28
when upgrading a t25 into a T28, for any decent power gains, you have to increase the flow of the hot side as well. Otherwise it will over spin and overheat, acting as a exhaust plug as you max it out trying to squeeze out the theoric power gains of that big compressor wheel.
most t25 turbine wheels are too small for any decent power but the largest T28 turbine wheel is similarly sized as a T3 stage1 and when using that wheel with at least .64 a/r, you can take full advantage of any larger compressor such as gt2860R 55 trim which is larger than t3 60 trim and good for up to 310 HP.
The problem with upgrading a T25 with both a larger turbine AND compressor side is the price: new t28 wheels and shafts and the workmanship to put them in can get costly.
most t25 turbine wheels are too small for any decent power but the largest T28 turbine wheel is similarly sized as a T3 stage1 and when using that wheel with at least .64 a/r, you can take full advantage of any larger compressor such as gt2860R 55 trim which is larger than t3 60 trim and good for up to 310 HP.
The problem with upgrading a T25 with both a larger turbine AND compressor side is the price: new t28 wheels and shafts and the workmanship to put them in can get costly.
#12
Re: t25 upgrade to t28
i donno its supposed to be a bigger turbine wheel to, i think from the 60 trim T3 as well but i am getting 1k rpm more lag than b4 so i am pretty sure its a decent size bigger. The guy at Gpop said it should be increadibly similar to the Gt28 minus the little better spool you get with the BB turbo. Are you familiar with the Garrett big T28 it is not modified by the shop it is sent from garrett as a big T28 what kind of power gain would u expect between this turbo and the much smaller T25 Blaast?
#13
Re: t25 upgrade to t28
Originally Posted by Magik123
i donno its supposed to be a bigger turbine wheel to, i think from the 60 trim T3 as well but i am getting 1k rpm more lag than b4 so i am pretty sure its a decent size bigger. The guy at Gpop said it should be increadibly similar to the Gt28 minus the little better spool you get with the BB turbo. Are you familiar with the Garrett big T28 it is not modified by the shop it is sent from garrett as a big T28 what kind of power gain would u expect between this turbo and the much smaller T25 Blaast?
Ok I just checked and the nice turbine wheel to have on a T28 measures 1.85" X 2.12"
it compares to T3 stage 1 whcih is 1.93" X 2.56"
The wheel used on most recent gt25R and gt28R is 1.8" x 2.12" as well so it'S true that if you have that turbine wheel, you can make similar power than the GT's, even ithout the BB's, provided you use an equivalent sized compressor side, spool up difference due to the ballbearings is really not that bad and mostly not justificative of the twice higher price tag.
#15
Re: t25 upgrade to t28
If you want t28-sized turbos, go look at MHI turbos. A big16g has a hotside like a small T3, but can do 350-400whp with the right motor.
The T28 is good for making more torque when it spools, but you're stll limited to the power the turbine can offer. Flow = power, both for intake AND exhaust.
The T28 is good for making more torque when it spools, but you're stll limited to the power the turbine can offer. Flow = power, both for intake AND exhaust.
#16
Re: t25 upgrade to t28
Originally Posted by HiProfile
If you want t28-sized turbos, go look at MHI turbos. A big16g has a hotside like a small T3, but can do 350-400whp with the right motor.
Nothing spools like a big 16G, though. Hitchhikkr had one on his 94 LS, ported turbine and O2 housing, the ****** would sling 10 psi at 1000 rpms. It was insane, and the car was HUGELY driveable.
#17
Re: t25 upgrade to t28
Originally Posted by Joseph Davis
Nothing spools like a big 16G, though. Hitchhikkr had one on his 94 LS, ported turbine and O2 housing, the ****** would sling 10 psi at 1000 rpms. It was insane, and the car was HUGELY driveable.
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