T3 vs T4 1.06 twinscroll housings, any power/response difference?
from a few tests i saw running the 6466 its a promising turbo. but you also cant go wrong with the HTA86. its been a great turbo for me. i just feel that ****ty ATP part was holding me back and i wanted to give the PTE turbos a try. if it dont work out and i still have my HTA86 turbo then it will be getting a 1.15 and being put back on.
I've heard Garrett is coming out with new divided housings that will be made from Ni-Resist and use modern volute designs specifically for the GT turbine wheels.
Anybody have more info/"know if it's true" or even dates?
Anybody have more info/"know if it's true" or even dates?
Last edited by 03whitegsr; Apr 10, 2012 at 08:50 AM.
Evolving Member
Joined: Jun 2004
Posts: 371
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From: Australia
Hi from Australia .
Good peoples you are probably finding that the reason why its had to get a decent turbine housing for your GT35XXR turbo is because they are based on the smaller GT25 ball bearing center section .
Once you jump up a frame to the one used in GT37R/GT40R/T04R the problem seems to evaporate .
There is actually a couple of larger frame GT35 and GT35R versiona out there and I think they were OE on some Hino and Isuzu truck diesels . I think the Isuzu engine family was call Si Tek or something like that .
I think the turbine housing ARs were something like 1.05 and 1.17 ish and twin scroll T4 International style .
Note they were available in bush and BB cores , I have a damaged bush one here somewhere and I'll see if I can read its ID plate . May be able to cross reference turbine housing part numbers from there .
My one has an 82mm GT40 compressor I think in 82 trim and like most/all these bigger frame units it is a theaded bore wheel - no jamb nut .
Maybe an easy answer is to base some of these turbos on the GT37R core and fit an 82 or 86mm HTA wheel to that .
Damn shame there is no T4 TS GT30 turbine housings and I don't see Garrett ever doing them either .
A .
Good peoples you are probably finding that the reason why its had to get a decent turbine housing for your GT35XXR turbo is because they are based on the smaller GT25 ball bearing center section .
Once you jump up a frame to the one used in GT37R/GT40R/T04R the problem seems to evaporate .
There is actually a couple of larger frame GT35 and GT35R versiona out there and I think they were OE on some Hino and Isuzu truck diesels . I think the Isuzu engine family was call Si Tek or something like that .
I think the turbine housing ARs were something like 1.05 and 1.17 ish and twin scroll T4 International style .
Note they were available in bush and BB cores , I have a damaged bush one here somewhere and I'll see if I can read its ID plate . May be able to cross reference turbine housing part numbers from there .
My one has an 82mm GT40 compressor I think in 82 trim and like most/all these bigger frame units it is a theaded bore wheel - no jamb nut .
Maybe an easy answer is to base some of these turbos on the GT37R core and fit an 82 or 86mm HTA wheel to that .
Damn shame there is no T4 TS GT30 turbine housings and I don't see Garrett ever doing them either .
A .
Hi from Australia .
Good peoples you are probably finding that the reason why its had to get a decent turbine housing for your GT35XXR turbo is because they are based on the smaller GT25 ball bearing center section .
Once you jump up a frame to the one used in GT37R/GT40R/T04R the problem seems to evaporate .
There is actually a couple of larger frame GT35 and GT35R versiona out there and I think they were OE on some Hino and Isuzu truck diesels . I think the Isuzu engine family was call Si Tek or something like that .
I think the turbine housing ARs were something like 1.05 and 1.17 ish and twin scroll T4 International style .
Note they were available in bush and BB cores , I have a damaged bush one here somewhere and I'll see if I can read its ID plate . May be able to cross reference turbine housing part numbers from there .
My one has an 82mm GT40 compressor I think in 82 trim and like most/all these bigger frame units it is a theaded bore wheel - no jamb nut .
Maybe an easy answer is to base some of these turbos on the GT37R core and fit an 82 or 86mm HTA wheel to that .
Damn shame there is no T4 TS GT30 turbine housings and I don't see Garrett ever doing them either .
A .
Good peoples you are probably finding that the reason why its had to get a decent turbine housing for your GT35XXR turbo is because they are based on the smaller GT25 ball bearing center section .
Once you jump up a frame to the one used in GT37R/GT40R/T04R the problem seems to evaporate .
There is actually a couple of larger frame GT35 and GT35R versiona out there and I think they were OE on some Hino and Isuzu truck diesels . I think the Isuzu engine family was call Si Tek or something like that .
I think the turbine housing ARs were something like 1.05 and 1.17 ish and twin scroll T4 International style .
Note they were available in bush and BB cores , I have a damaged bush one here somewhere and I'll see if I can read its ID plate . May be able to cross reference turbine housing part numbers from there .
My one has an 82mm GT40 compressor I think in 82 trim and like most/all these bigger frame units it is a theaded bore wheel - no jamb nut .
Maybe an easy answer is to base some of these turbos on the GT37R core and fit an 82 or 86mm HTA wheel to that .
Damn shame there is no T4 TS GT30 turbine housings and I don't see Garrett ever doing them either .
A .
ATP has a recast 30R T4 housing but I havent seen that one, the 35R was less than desirable. What about an unmachined P trim? I think those were a 72.5mm turbine (37 stuff right?) but I know they had the larger sizes available.
aaron
Drifto saw 600whp using an HTA3076R, E85, and a 1.06 A/R divided T3 housing. Being that one cannot realistically expect more power using that turbo, it demonstrates that a T4 housing isn't necessary for GT30R setups.
I see that ATP lists a v-band 1.06 A/R divided T3 housing here:
1.06 TS T3
As for the ATP housings in general, I didn't notice any obvious internal fault with my 1.06 TS T4 unit. I checked the alignment, and everything appeared to be correct. I did clean some casting flash in the interior with a Dremel, but it was minor. I'm curious to know what others have found specifically that was disappointing.
I see that ATP lists a v-band 1.06 A/R divided T3 housing here:
1.06 TS T3
As for the ATP housings in general, I didn't notice any obvious internal fault with my 1.06 TS T4 unit. I checked the alignment, and everything appeared to be correct. I did clean some casting flash in the interior with a Dremel, but it was minor. I'm curious to know what others have found specifically that was disappointing.
Drifto saw 600whp using an HTA3076R, E85, and a 1.06 A/R divided T3 housing. Being that one cannot realistically expect more power using that turbo, it demonstrates that a T4 housing isn't necessary for GT30R setups.
I see that ATP lists a v-band 1.06 A/R divided T3 housing here:
1.06 TS T3
As for the ATP housings in general, I didn't notice any obvious internal fault with my 1.06 TS T4 unit. I checked the alignment, and everything appeared to be correct. I did clean some casting flash in the interior with a Dremel, but it was minor. I'm curious to know what others have found specifically that was disappointing.
I see that ATP lists a v-band 1.06 A/R divided T3 housing here:
1.06 TS T3
As for the ATP housings in general, I didn't notice any obvious internal fault with my 1.06 TS T4 unit. I checked the alignment, and everything appeared to be correct. I did clean some casting flash in the interior with a Dremel, but it was minor. I'm curious to know what others have found specifically that was disappointing.
yes my T4 atp 1.06 housing was complete junk. the casting was terrible. when i pulled the housing off it was cracked in 4 spots on the inside divider. that is why i went with the PTE turbo and PTE T4 1.15 housing. which looks like it is made extremely well. i was supper happy with the casting
i have a HTA gt3582r with the divided atp 1.06 ar hotside with a full race t4 twinscroll manifold. This setup has been on my car for the past 4 years with over 80,000 miles with no problems. I wonder if my housing is all cracked up if i were to take the turbo/manifold off.