I am in the market for a new turbo as the one I have runs a little too hot on the top end. I was wondering if anyone has the 63/68 installed in their truck. I am looking at one right now in specific, it's a 63/68/.88 T4 undivided non wasgated. I will buy a T4-T3 divided adapter. My main question is, how Would the lag be with the .88 T4 housing? I will be running it with the mods in my sig, I will be putting 50s on later this year. But for the time being, can I do ok as far as lag goes. I am really looking at this turbo because of the sub $1,000 price tag. I am hoping it will give me a good HP boost. As of right now, the He351 dies out of air on the top end. Any advice is appreciated.

 

I remember seeing you on CF, if I could make a recommendation to you, try to buy the turbo with the .91 a/r divided housing. My buddy that had the turbo recommended it to me as the divided housing will do better (in terms of spooling) vs the undivided housing.

If you check around you could land a phat shaft turbo or a bd special for around 1200 that is slightly used.

 

Oh hey Mike, yeah, you sold the one i was looking for, haha. So a divided is better. I am curious what the size would be in cm's on that .91. I wonder how I could spool it with my current mods? The only problem I see is the huge T4 housing.


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What does .91 a/r mean? Is .91 the sq. in.? The only thing I can correlate it to, is maybe one side of a divided housing. That would make sense - 2 x .91 sq. in. = 11.74 sq. cm. . BTW 1 sq. in. = 6.452 sq. cms.. Craig

 

Schomer I don't know how all that stuff works on the size, especially with it being a T4 housing. But I might just pay for a T3 housing.


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A/R = area/radius or the cross sectional area of the inlet of the exhaust housing divided by the radius of the turbine.

There is no direct way of generically converting an A/R to CM squared due to the fact that same A/R numbers for different sized housings can be radically different in volume.

Example: The .99 A/R of my gt4094r is roughly a 16cm2 housing. A .96 A/R on the gt4718r is closer to a 22cm2 housing.

 

Thanks. So a/r is another number to play with, along with wheel dia. and turbine size. Craig