Can anyone tell me what the difference is in the H housing compaired to the standard S turbo housing?? I am getting ready to order a new 67 turbo and want to make sure to get it right the 1st time. I think the H housing is much larger and will cool the charge better?
67 turbo
- Thread starter incharge
- Start date
Welcome!
By registering with us, you'll be able to discuss, share and private message with other members of our community.
Royal-T-Ltd
Well-Known Member
- Joined
- Jul 12, 2003
- Messages
- 4,328
H housing is A/R .75 and has 4" inlet 3" outlet
S Housing is A/R .70 and has 4" inlet 2.5" oultlet
i guess if you have a VERY high horsepower car the charge temp might be a little cooler but all in all, i think most guys get it because it looks bad ass and its nice to be able to use straight 3" hoses rather than reducer hoses [for the front mount guys]
S Housing is A/R .70 and has 4" inlet 2.5" oultlet
i guess if you have a VERY high horsepower car the charge temp might be a little cooler but all in all, i think most guys get it because it looks bad ass and its nice to be able to use straight 3" hoses rather than reducer hoses [for the front mount guys]
- Joined
- May 26, 2001
- Messages
- 2,901
To add more, it is worth a little more hp at high boost levels. AKA: when you're up at 28-32psi. Could be worth as much as 10-15hp. This is mainly due to the cooler charge temps created by the larger A/R of the compressor cover when running very high boost. Going from a .70 to a .75 A/R. (S cover to H cover) If you know from the get go that you are going to be maxing out the turbo, or you know that you want to run 25-30psi, then I highly recommend the H cover over the S.
Now, if your set up is a street car and you want the turbo to spool the fastest it can and won't be venturing in to the land of high boost (27+psi) then opt for the S cover. Although the lag difference between the two covers has never been proven, and in all likely hood with the dual bb cartridge spool up is really not a factor, I could see where on the non ball bearing versions it could be 100-200 rpm difference, which to me, is insignificant. Don Mudrich (d0n_3d) runs the PT6776RLHP on his GN with out of the box GN-1s, cam, Trans Pro with straight 4" MAF pipe, 70mm t-body and PTE plenum, RJC power plate, 65# High Z's, Hotwired 340M, PTE FM IC, 3" THDP, 2.5" dual exhaust and stock high mileage bottom end, and spool up with an Art Carr 9" non l/u 3500 stall is instantaneous.
As of now, the PT6776RLH or HP is the ultimate 67 turbo for a Buick application. H means straight 4" inlet and 3" discharger. HP means 4" inlet with multiple slots cut into the inlet for the ported shroud and 3" discharge. Both have a .75 A/R ratio.
Hope this helps a little.
Patrick
Now, if your set up is a street car and you want the turbo to spool the fastest it can and won't be venturing in to the land of high boost (27+psi) then opt for the S cover. Although the lag difference between the two covers has never been proven, and in all likely hood with the dual bb cartridge spool up is really not a factor, I could see where on the non ball bearing versions it could be 100-200 rpm difference, which to me, is insignificant. Don Mudrich (d0n_3d) runs the PT6776RLHP on his GN with out of the box GN-1s, cam, Trans Pro with straight 4" MAF pipe, 70mm t-body and PTE plenum, RJC power plate, 65# High Z's, Hotwired 340M, PTE FM IC, 3" THDP, 2.5" dual exhaust and stock high mileage bottom end, and spool up with an Art Carr 9" non l/u 3500 stall is instantaneous.
As of now, the PT6776RLH or HP is the ultimate 67 turbo for a Buick application. H means straight 4" inlet and 3" discharger. HP means 4" inlet with multiple slots cut into the inlet for the ported shroud and 3" discharge. Both have a .75 A/R ratio.
Hope this helps a little.
Patrick
Hey Patrick, how come you never told me this at Indy?? :biggrin:
- Joined
- May 26, 2001
- Messages
- 2,901
Because it didn't exist back then.
It was added about a month later.
It was added about a month later.
- Joined
- May 26, 2001
- Messages
- 2,901
No problem sir.
As far as I know, you are still the fastest with this turbo that has been reported.
Patrick
As far as I know, you are still the fastest with this turbo that has been reported.
Patrick
- Joined
- May 26, 2001
- Messages
- 2,901
Hi Chris.
If you're talking about the dual ball bearing version, then honestly if your converter will flash stall to 3200-3300 rpm, this will spool this turbo very well. A 3500 spools it insanely fast IMO.
HTH
Patrick
If you're talking about the dual ball bearing version, then honestly if your converter will flash stall to 3200-3300 rpm, this will spool this turbo very well. A 3500 spools it insanely fast IMO.
HTH
Patrick
