ATP sells it for the 30r and 35r.

T4 1.06 TS

 

Does anyone know if they make a bigger housing then the T4 1.06 for the 35r? I want to buy one.

 

ops, looks like FP doesnt offer 1.06 , they only have the 1.00 T4's

 

the 1.00 is a garrett part. the 1.06 is a ATP part.

 

Largest t4 exhaust housing I've seen is a 1.10 a/r Borgwarner, lmk if your selling your 1.06 though. I'm running a .63 Precision t4 exhaust housing that came with the 35R that I bought for cheap... I know its pointless It made great numbers, spools hella fast, and pulls hard all the way to 8k rpms on the stock 2.0 though.

 

i have seen as big as 1.32 t4. i know they make 1.15's but i am not sure if they make them to fit the 35r turbine wheels. i know they make them for the 37r and 6765 type turbos.

if i sell the 1.06 it will be a long time from now. i need to find a housing. have it put on and then tuned. if it makes a difference where i want it to then ill sell the 1.06. otherwise it will go back on the car. i might even try a TS 6766.

 

so still no testing done on the same car with SS vs TS? I need some dynosheets to justify to buy a TS

 

a ts setup is not going to make more hp then a open scroll setup on the same turbo. but if setup correctly with a proper sized turbine housing you will get a little faster spoolup. the problem with ts IMO is the limited sized turbine housings.

 

To add to Dan's comment, you will get better response between gears. IF you size it the way you are supposed to, the spool will also be negligible. The main thing to remember is that Twin scroll in a small housing will spool faster and choke up top. You could accomplish that with a smaller single scroll. According the SAE papers that have been referenced (though I havent personally read them, maybe later tonight), a TS will spool like its 60% of its size and make 90% of the power of its size when converted to a single scroll figure.

I.e.-

1.00 A/r would spool like a 0.60 A/r and make the power of a 0.90 A/r. Another thing to keep in mind is that a T4 has higher volute volume so you can only compare to another T4 not a T3. What we found on Jeff's car with his HTA105 (42R with 105mm exducer) is that going from a 1.0 A/r Tial to the 1.44 TS it looked like we lost spool based solely on the dyno sheet. However what we can get it do now against load (i.e. converter) is crazy compared to the 1.0 housing and we have DRASTICALLY reduced backpressure and picked up power.

Dan and I have been searching for the mythical 1.15 T4 for the 3586, I have one for my 3794 so it will be interesting to see where it spools vs other cars (or even my 0.82 T3 setup with that turbo) and more importantly how it responds.

 

+1 !!
results please!

 

To emphasize what the others have said, you are not likely to see the greatest benefits of TS in a dynosheet, which reveals nothing about transient response and turbine speed recovery. Where you will know the difference is from behind the wheel, and a vivid difference it is.

 

Below are the results I saw with no change in tune. The 0.63 and 0.82 a/r were standard T31 4bolt turbine housings. Turbo was GTX3076r.

 

So a T4 1.15 is the best choice if you can choose between 0.82 T3 or T4 TS 1.15. Now the next choice is 6466 or 6766, Dan are you considering these 2 also for your next setup? I saw you mentioning 6766.

 

the casting and design of the ATP 1.06 is junk. this is my 3rd one and its cracked in 4 spots. im done with ATP parts. i was able to get a 1.15 for my HTA86 but i want to try these new PTE turbos. people are showing great results with them with proven track times to back it up. i was also looking at the 3794 but that thing is just to extreme for me.

i bought a 6466 with T4 1.15 housing.

 

From what I was told it is actually a Garrett casting, but from another application. I don't know what wheel you run, but cracking issues are likely caused by having to bore the housing for a wheel that is larger than the housing was originally designed for. In the several months I ran the housing cut for the GT30r wheel it had no issues, but I am now running the GT35r turbine wheel with no issues, but we shall see. Can you provide more detail to the problems you had so when I remove my turbo in the coming weeks I can check for these issues?