dirty_old_chevy

Just like the title says, does anyone have a direct comparison between the two, with the 75mm compressor and 83mm turbine? All other things being equal, how much difference does just the different flange make when it comes to back pressure, spool, power, etc? I realize this would probably be a pointless experiment in most cases, I guess I am just wondering if the flange can actually cause a restriction with a small turbine like that.

cptinjak

Displacement? Fuel type? Power level? All of these things effect how the turbo will behave.

Jack

Forcefed86

iTrader: (4)

Similar question for the bulls-eye folks.

Are the turbine housing scroll diameters in a 1.10AR T6 the same as a 1.10AR T4?

dirty_old_chevy

Already have the t6 version. It's in a 2004 Silverado 1500. I basically just started this tread for curiosity/discussion sake. If you're curious about what I have: it's a KB t6 kit, 475/83, 91 octane/meth. Truck has a 4.8, but kinda burnt a hole in the number 3 piston when it was getting it professionally tuned. With 10* timing, 80/20 meth/water, 15lbs boost, and 91 octane, no knock detected, lol. I suspect that one of my new 77 lb injectors are extremely shitty, giving it just enough fuel to support combustion and start burning the piston material, but not enough for a knock. We shoved a camera down there and there was a hole burnt through the piston the size of my thumb. I have an l33 to go in there, just haven't had the time to get it in. I'll probably just run zr1 60# injectors and stick to low boost for the first while. Anyway, that was a huge ****-off. I was just curious if the size of flange makes much of a difference with that small of turbine. Not that it's any concern of mine, I already have the t6.

cptinjak

No they are different.

Jack

cptinjak

On a turbo/engine combo of your size, i would expect to see a few hundred RPM difference if you went from a T-4 to a T-6 while maintaining the same A/R. Probably not as drastic as most people imagine.

Jack