Hks2835 Tune

[discopotato03]

Yes bang for buck with this 2835 KAI could be OK . Provided HKS have just machined out their "T3" flanged 0.64 A/R GT28 turbine housing this opens up a few more doors if say you have a T3 flanged GTRS .

If think about it the GTRS already has a port shrouded comp housing on the cold side and it wouldn't be terribly hard to get a cropped GT30 turbine fitted to its cartridge . Again provided the KAI uses the same turbine housing as a GTRS should be able to be machined out for the larger cropped GT30 turbine and you end up with a 2835 KAI but with a 52 trim 71.1mm compressor .

I'll have to check some pics and specs because there is a remote possibility that the basic comp housing used on the 2835KAI is same/similar to the GTRS .

Simple effective upgrade for those wanting a tad more from a GTRS ? A bit less turbine inlet pressure anyway .

A .

[SimonR32]

Keeping these points in mind, a common fault in tuning is setting a high gain to acheive target boost as quickly as possible, yet have boost drop off in the higher RPM. Obviously based on the above the best way to tune would be to start with a low gain and work your way towards target boost by upping the duty cycle.

How is gaining up to 50hp through the midrange and maybe losing 5-10hp top end a fault?

[75coupe]

In the powerFC boost control all you can change is boost pressure and duty cycle

so to bring boost on asap would I increase the duty cycle or lower it?

and will this change the final boost pressure?

[89CAL]

I think the FC boost control kit has boost and gain? Or it might be boost and duty?

I can't remember, all I know is that the number that is usually 255 when you first enter a boost setting changes over time so I figured it would be gain that ou adjust going on the explanation given a few posts back but it could be duty, been to long since I played with it lol. But that's good info. I now understand what gain and duty do now

Should make it easier when I go to setup the KAI

I've found when playing with it, adjusting the duty or gain, whichever it is, will change the boost you get. I think with a low setting I had it hit about 8psi then start creeping up. But again it's been a while. I know it hit a certain boost then creeped up or down from there but so playing with it to much will change your boost

[89CAL]

nothing been said in here for a while

but thought id put up a comparison photo of stock vs HKS 2835 KAI

[Mick_o]

Gday Cal been reading up about your 2835 Kai hope you have some good luck getting it right id like to know how u go with it mate cos im getting the same kit through streeter its due this time next month. Id like to know what kinda figures you make when you get it dyno tuned mate hopefully its something simple i cant imagine that HKS could of gone too far wrong with this kit considering how good the Pro S was for the RB25s Please keep us posted on what you come up with mate

CHEERS

Mick

[GTScotT]

Hoping you are yet to order the kit..

The KAI is yet to match Pro S results.

[Mick_o]

No i havent ordered it yet and yes i can see its not looking good at this stage for the Kai kit!

Not compared to the Pro S!

Im keeping my eyes peeled in here to see what the outcome is with this drama with the power figures.

i maybe have too much faith in HKS thinking that they couldnt of gone that wrong with the Pro S replacement cause the pro s was a monster!

[DaveO74]

You can still get teh pro s if you look around. Picked up mine brand new about 4 months ago.

Wasn't cheap though

[Mick_o]

Yeah only person i can see selling them is a guy on ebay for $3900! thats a bit rich for my liking lol

[Mick_o]

Where did u pick yours up from DaveO?

[wolverine]

I didn't make the same headline numbers as some other people here at SAU with the ProS but I put this down to the variation in car setup, dyno, tuners and the lack of desire to wring the neck of the turbo to make a peak power number.

I think the kai will prove to be a good bit of gear when we see more results.

[NISMOGTT]

Not sure what most issue are about having the big top end number, it should be able drive-ability on the street, well it is for me...

My KAI gets me to over 400Nm before 3500RPM and max is up over 450Nm by 4500RPM.... also my power line builds faster that my stock turbo did and does not die off until redline... power is 350Hp up around 6300RPM...

most drive-able 350Hp car i have driven... i even save fuel now as i dont need to drive as hard to get some boost as before....

as said i think too many look for the big end power number but forget about driving under 3500RPM on the street...

just my 2cents after having this turbo on my car... still need my tune to be touched up as well which should see it a bit smoother and maybe slightly better numbers.

[89CAL]

Highest number I've seen. I only managed 325rwhp on mine. This is about the average from what I've heard.

Can you list your setup? Interested to see if there's a difference

[Mick_o]

So were you happy with the results you got from your Kai kit NismoGTT?

[DaveO74]

Where did u pick yours up from DaveO?

cjmotor on eBay, they are a performance shop in qld.

3600 delivered to Sydney.

He had I think 4 kits in stock for the rb25 when I bought mine.

[NISMOGTT]

89CAL,

NISMO fuel pump

800CC Power Ent. Inj.

Z32

Power FC

Blitz EBC

genreric FMIC

3" zorst come from Japan, bellmouth dump, and some hi-flow cat brought over 4 years ago so can't remember brand

stock AirBox with no cover just a mech grill on filter...

nothing else except a new clutch and a healthy engine according to the tuner.

Mick_o,

yeah i am very happy with this for on the street as i said i get boost better than my stock turbo and am actually using less rev's to drive as the car feels a lot more lively now....

[89CAL]

I have a very similar setup.

Nismo 555cc injectors and a K&N pod being the only notable differences.

What AFR and what sort of timing are you running around the top end (if you have that information handy)

[NISMOGTT]

I have a very similar setup.

Nismo 555cc injectors and a K&N pod being the only notable differences.

What AFR and what sort of timing are you running around the top end (if you have that information handy)

Sorry for that i am not too sure.... i would have to ask my tunner next time i see him so i dont give you mis-leading info...

[89CAL]

Sorry for that i am not too sure.... i would have to ask my tunner next time i see him so i dont give you mis-leading info...

Not a problem

Having a copy of the tune to compare would be great, but I'm not going to ask for that as I know the answer I/You will get from the tuner lol.....