T3/T4/T6 Limits

Ok has anyone done a test of how far you can push t3/t4/t6 and what a/r you had in the tests and what turbo specifics? I did some looking around and couldn't find anything. There may already be a post on this.

Seems like on several trucks I've been messing with trying to get more out of them

So I've got 3 trucks all in the 900-1000 range all 3 have dual fuelers w/stock pumps. I'm tuning all three trucks.

Truck 1 is 05 5.9 88% II Injectors, S476SXE 96 Turbine T6 1.15 and made 983hp @3400rpm 50psi boost 63psi drive

Truck 2 is 05 5.9 200% DDP Injectors, S476SXE 87 turbine t4 .91 and made 930hp @ 3100rpm 55psi boost 70psi drive

Truck 3 is 08 6.7 123% II Injectors, 66/74 .80 t3 gated housing then a 80/96 1.32 t6 compound setup. Made 916 hp @3100 rpm 70lbs boost 73 lbs drive.

I know this isn't comparing apples to apples by any means but I'm just curious if someone has done an accurate test with adjusting tuning to make optimal power with a specific setup and turbo then changed only turbo and see what the limits are and where the choke hold is really happening. As you can see the truck with the smallest injectors is currently making the most power and is obviously seeing the lowest drive pressure.

I would like to see you swap truck 1 & 2 manifold and charger with no other changes.

Is there a T4 1.15 housing for 96 turbine ? It should make about same power than T4

Leiffi said:

Is there a T4 1.15 housing for 96 turbine ? It should make about same power than T4

Click to expand...

Isn't there a 1.0 or 1.1 t4 that will work with the 96 turbine? Or would that be too small?



This whole thread is a good read. But I found one particular post that compared a sxe to FI unit as well as boost to drive pressures. See the link below.
Competition Diesel.Com - Bringing The BEST Together - View Single Post - FI 76mm 6.53@108 QCSB 06 - Suspension Setup

Leiffi said:

Is there a T4 1.15 housing for 96 turbine ? It should make about same power than T4

Click to expand...

Yes there is. .90a/r to 1.25 I believe. They are $750-$800.

This is going to be really difficult to compare, because there is more to it than just the turbine housing flange size. A t3 needs to be setup much differently headflow wise than a t4 or t6 in order to optimize power.

The way it would need to be done is to optimize 1 truck for each flange and do your testing that way, the problem with this however is youll likely find yourself runnning large turbine wheels and large A/R housings in the t3 and t4 trucks just to squeeze that little extra power out, this becomes irrelevant because it would be much more efficient to just start out with the larger flange in those cases.

This also changes drastically when you consider multiple pressure stages.