| View previous topic :: View next topic |
| Author |
Message |
MillsMotorsport
Joined: 05 Nov 2011
Posts: 28
Location: Melbourne, Australia
|
 Posted: Wed Dec 07, 2022 4:14 pm Post subject: 931 k26 compressor inlet diameter? |
 |
|
Hi All,
Does anyone know, or can measure the internal diameter of the inlet of the stock k26 turbo?
Thanks,
Delian |
|
| Back to top |
|
 |
Mike9311
Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish
|
| Posted: Thu Dec 08, 2022 12:41 am Post subject: |
|
|
What year?
Are you trying to figure out what compressor wheel you have?
Best way is to remove compressor cover.
Konrad did just that in the thread below yours
https://www.924board.org/viewtopic.php?t=45802&start=75
The difference is 2mm on the inlet between the 2660 and 2664 so it would be hard any other way
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
|
| Back to top |
|
|
MillsMotorsport
Joined: 05 Nov 2011
Posts: 28
Location: Melbourne, Australia
|
| Posted: Thu Dec 08, 2022 8:43 am Post subject: |
|
|
| I am looking to upgrade to a modern turbo (EFR6258) but the racing rules I need to follow state I can have up to 10% larger inlet diameter on the replacement turbo than the std turbo. I have a k27/k26 hybrid turbo, so I don't have k26 compressor housing to measure. So actually, I'd like to know the inlet internal diameter for the 2660 and 2664, then I can use the larger dia (if they are different) as the basis of my upgrade calcs. Thanks. |
|
| Back to top |
|
|
kondzi
Joined: 02 Jul 2018
Posts: 485
Location: Poland/EU
|
| Posted: Thu Dec 08, 2022 10:10 am Post subject: |
|
|
I’m waiting for the 2664 to arrive in the upcoming few days. I can make the measurments you need.
_________________
---
Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded) |
|
| Back to top |
|
|
Cedric
Joined: 27 Aug 2004
Posts: 2614
Location: Sweden
|
| Posted: Thu Dec 08, 2022 8:49 pm Post subject: |
|
|
| MillsMotorsport wrote: | | I am looking to upgrade to a modern turbo (EFR6258) but the racing rules I need to follow state I can have up to 10% larger inlet diameter on the replacement turbo than the std turbo. I have a k27/k26 hybrid turbo, so I don't have k26 compressor housing to measure. So actually, I'd like to know the inlet internal diameter for the 2660 and 2664, then I can use the larger dia (if they are different) as the basis of my upgrade calcs. Thanks. |
Is it an S1 or S2 engine?
Normally you can never be sure what i actually sitting there, because the replacement turbos was a bit all over the place.
If you have a ROW S1 you should have a 60mm wheel with 42mm inlet diamter
If you have a ROW s2 you should have a 66mm wheel with a 40mm inlet
The 924 turbos didnt have any larger compressor inlet than 42mm inlet (Except for the GTS model), so it should be a good starting point for your calculations, depending on how strict the regulations are..But that EFR have a 49mm inlet if I understand it correctly, so should be a bit to big.
_________________
1980 924 Turbo
www.instagram.com/garagecedric/ |
|
| Back to top |
|
|
MillsMotorsport
Joined: 05 Nov 2011
Posts: 28
Location: Melbourne, Australia
|
| Posted: Thu Dec 08, 2022 10:15 pm Post subject: |
|
|
| Thanks Cedric, Garrett GTX2860 Gen 2 has 46mm inducer diameter which would be legal under the rules and should deliver similar performance to the EFR6258. |
|
| Back to top |
|
|
Mike9311
Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish
|
| Posted: Fri Dec 09, 2022 12:13 am Post subject: |
|
|
Just in case anyone argues you can also add 1mm to the wheel inlet size Cedric provided to get the "housing" inlet size  
Two top housings are actually 1980 USA 931 S1 Housings. Ignore the bottom two
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
