Hks 2835 Kai

[Mick_o]

Ive just bought a HKS 2835 Kai which is due for delivery this time next month and im wondering if anybody has figured out why they arent producing good hp figures like the Pro S

Does anybody know whats difference between the the 2 apart from the less torque and slightly more power and the surge slots in the front of the housing???

[GTScotT]

The Pro S has the HKS special rear housing which appears to be appropriately designed for the GT30 turbine family. It requires the HKS dump pipe to work and is a fairly trick piece of kit.

The KAI has adopted the GT28 based HKS housing from the GTRS... It bolts to the factory design RB dump flange and is generally a more compact unit.

I have not read heavily into the KAI as once I saw the results I decided the Pro S was the one to have.... Hopefully one of the KAI boys can talk about their experiences and can confirm the part number on the CHRA (I would want to know it is the same unit). But there are already a couple of KAI threads you would want to look for.

[Mick_o]

Thats right i remember the pro S does come with the dump pipe wonder if the rear housing is smaller?

I WANT A PRO S

[DaveO74]

I "think" the Kai is .64 and the pro s .68???

By looking at the pro s housing and dump I assume the flow is going to be much better, the dump especially is pretty chunky

[wolverine]

Disco did link some turbine maps which point to the likelihood of the GT28 based turbine being capable outflowing the ProS.

I want to see one back to backed on a known dyno before I call them a poorer performer.

[Mick_o]

Well i hope that they arent a poorer performer because i bought 1 hahaha!

I just cant imagine hks making this turbo less effective than the older kit as HKS always do their homework with their turbos (in the past at least!)

If anybody has any news on their Kai turbos please let me know

THANKS

[89CAL]

I'm in the middle of experimenting with a variation to the KAI. Its a temporary "fix" I guess just waiting on a dyno ATM (tune getting touched up on the road this weekend)

I will share my results with HKS and then see if there will be any follow up (if the new setup out performs the old, it feels much better ATM anyway)

As far as I know I'm the only one on these forums at least doing any testing but if anyone else is this is where I guess they will be posting

[Mick_o]

Hey Cal i have seen ya pics of what u have done so far. think ill get another housing machined up without the surge slots like you have done i hope the dyno is kind to ya mate cause i can see you are doing ya homework on it im thinking of a way how to fill in the counter sunkholes where the housing bolts onto the front of the turbo too maybe with a metal putty or something???? but im kinda scared of the putty not bonding properly and sucking it through the turbo

[89CAL]

Yeah I wouldnt use anything like that

I had thought about blocking up the holes with grub screws or something (threading them then putting grub screws in) but didnt think it was a great idea to do that. The cover doesnt have any form of seal (apart from the metal to metal flat surfaces) which isnt really a problem in normal form but I figure I'm probably getting a minor leakage. Thats why what I'm doing is a "quick fix" to see if it works before pursuing another alternative. I'm in contact with HKS about it, and if it provides gains I will be asking them for a Pro S front housing to put on to get some proper results.

Thats about all I can tell you at the moment. It's all trial and error at the moment.

If you want to get a new housing machined for your turbo, PM Hypergear (Stao). He is who gave me the original idea to block the anti surge slots and was pretty damn helpful about the whole thing. he was willing to machine a new front housing for it but I dont have the time to take the car off the road and send the turbo down to him.