Good day all

I'm busy putting a K24A2 AWD Civic build together and would like some input on turbine housing size. I'm familiar with B-series turbo sizing but the K24 is a bit of different animal.
Build parameters are as follows:

Power range is 700 - 850whp depending on track used. Altitude 5500ft

• K24A2
• Stock port head
• Stock cams for now (Drag Cartel 2.2 in future)
• Supertech HD Valvespring & Retainers
• Ferrea Comp Plus stock size valves
• CP 10:1 Compression Pistons
• Manley TT w 625 fasteners
• L19 headstuds
• E85

Power range is 700 - 850whp depending on track used. Altitude 5500ft.
Workable rpm range: 5000 - 8000rpm

Turbo: Precision 6466. I'm leaning towards a T4 footprint that will allow us to switch to a larger frame turbo if we ever wanted to.

>> What size turbine housing would be best for this combination ?
>> Divided or Un-divided
>> Single or Twin gate ? Will be going with a KLM manifold so have the option of either

Thank you

 

Noooo precision mannnnnn go for an hx52! Haha For real the 11cm 6770 hx52 with a billet version will be grat for that combo.
On 6466 T4 1.35 for that horsepower with a divided setup if its gonna see some street. If its not gonna even have licence plates id go for T4 .81
If your paying for a new turbo for 850whp id go for an EFR 8474 T4 1.45 a/r

 

the 850whp. First question....is that actual power at that elevation? no corrections? and are we talking dynojet or mustang numbers?

 

Decided to try the PTE thing for this build. 16cm2 is where its at though for the HX52.

Dynojet equivalent numbers and no correction. Goal is to run 9.50's on a "street-type" surface

 

Id have to say it will be very difficult to do 9.5 out of track. We had the same shitty "tracks" here too. Many many cars tried to go below 10 but its very difficult.
Your best bet would be to cut the car a LOT. On 800 to the tyre without "paper-car" weight the best would be something like 10.5 or something.
NHRA tracks are nothing compared to what we mostly have in europe and i guess afrika too.
On AWD well i guess you can do 9.5 MUCH easier.

 

when you say street type surface are we on about Tarlton? I think the fastest Quentin Boylan went was 8.27 so there should be enough traction there for a 9.50

In the UK we can normally do a 9.50 with a 1.55 60ft with a comparable turbo and 1.0 rear housing on a k24, the issue is that its close to sea level here,

I would go divided to help give yourself a powerband and the T4 1.15 to help with the altitude, when people run at the pikes peak 1/2 mile event thats a common thing to either step up a turbine wheel or turbine housing size to help

with regard to gates I would say go for a pair but depends on what range of boost you want to be able to control, ie what sort of power do you want in first on the 'street surface' and how much(40psi+) do you want in 4th

 

No, Tarlton is usually prepped but the surface is deteriorating badly. We will race there too but I'm focusing more on a tarmac type surface (circuit back straight/airstrip) with some 60ft "prep". I think a T4 1.15 divided sounds like a good option. I know the 2JZ guys like the 0.81 T4 open housing on the 6466 and we have a SR20DET here running the divided 0.84.

I'm looking to avoid the infamous boost creep scenario on K series engines, so will likely go for 2 x 40mm gates which should allow me some resolution.