Anyone know the hp flow limit of the hks cast? Is it capable of 550?

 

good question I have an undivided hks cast manifold.

Are you referring to divided or non divided?

 

Either, I'm running a divided, wondering when it stops flowing

 

Just curious, what are you making on it at the moment?

 

We have customer's making over 500whp with the FD HKS cast manifold. This is on a Mustang dyno also

 

It will max out based on physical turbo size limitations. Ie you will max out your turbo first.

 

I made 440rwhp at 18psi and only 444rwhp at 19psi on my to4s 60mm. We believed we ran out of turbo at the time.

I now am running 19psi on a TO4R 67mm clipped p-trim. Car also pulls much harder at 21psi. Unfortunately the only dyno I had access to was a Dyno Dynamics which showed oddly only 360rwhp and 366rwhp respectively.

The dyno was calibrated to read rpm based on road speed which was miscalibrated as the rpm peak read 6.5k while I was going to 7.5k.

The dyno owner suggests maybe its a flow issue which explains the only 6rwhp increase.

I'm begging the differ as the car is blowing through second and top of third on the street.

I plan to find another dynojet and rerun the two settings

My goal is 500rwhp at 24psi.


I'm running 14 degrees at peak trq, 12 split coming up to 15 near redline. 11.0afr, 660cc of 50/50 water meth on pump gas and hks twin power.

 

Doesn't walker dyno have a dynojet?

 

Made 518rwhp and 418rwhp today at 22.5psi based on map reading, 23.5psi from gauges

 

Yes he does have a jet and he's cool as ****, tried to set up a session w him but hinson was available and nearby

 

HKS divided on my FD.
I made 481hp @23 psi on a mustang dyno, that's approx. 520-530 on a dyno jet.
I'm on a master power turbo with a .96 turbine housing.
so I think big power (500-550) is possible, with the right turbo combo and supporting mods.

 

The problem I see is that the HKS cast manifold turbo placement doesn't accommodate the large compressor housing you will need to make 550+ RWHP.

If you use a spacer sure, but you are basically going to have to have everything optimized to hit over 550RWHP on the largest turbo that clears with an HKS cast manifold.

Recap: turbo limiting HP not manifold.

 

I think ill break 550 on the t04 around 26psi, its going tk require racefuel however

 

You shouldn't have a problem with being in the low 500's (as you've found out)with that turbo and manifold combo it's been proven over and over again. We've clipped P-trims a few different ways and some will work well and some will make little difference. Something to consider is upgrading the compressor to a better flowing billet wheel if you intend to run in the mid 20's or higher on boost. We've ran the 67's from precision to 48psi and still saw gains so it should work in your application fine to reach your goals.

~S~

 

Wow that's excellent news. I'd like to take it up but I'm paranoid of detonating/high egt on pump gas. I'm running 600cc water/meth 50/50 at 23-24psi seems like plenty of boost until I have a spare motor lol.

I don't see many guys going over 24psi without race fuel or e85

 

I wouldn't run much higher on pump gas and water, even still you got good numbers and a fun car.

~S~

 

I don't think it would be the flow of the manifold being the problem. It would just be the manifold position limiting a bigger turbo.
Having a better flowing manifold will help you with better spool and power over the cast manifold

 

FWIW, I mocked up an S372 on the engine stand with the FD HKS manifold. It fit the engine fine. It just hit the strut tower very badly when we tried to drop the assembly in the engine bay of the FD.