HKS Supercharger owners thread

[jeepmor]

Originally Posted by Jeff Gray

Thank you for the great response. I was hoping to find a V3 with the HKS Flasher. From what you're saying It sounds like I still want the V3.

I had one of the V3 kits, with the flasher, put on my car about a year ago. Solid tune, no codes yet. In a 14 FRS 6MT, great add to the car. It was rated at 255 whp with their header and exhaust. It has to be close with stock exhaust and CSG MXP catback. I've read 270 whp is capable with stock exhaust with a better tune.

I think HKS dropped the tablet portion of their kits entirely as I haven't seen them for a while. I have seen the used flash tablets online though. I can't part with mine until I take the leap to a new tune. One year in, still pretty happy. Would like a little more as I've learned to manage the extra power to the point I want more now.

[Yannis]

Hi, so "out of the box" all other things being equal - does the V3 of GT2 kit offer more bhp?
I am looking to buy and install one of the kits, but couple of dealers here in Greece claim that only V2 is available for the European market, and that V3 is "US market particular", aimed for the lower octane.

But someone should be able to get V3 and tune it for 98 octanes?

Really confused by the contradictory advices here - mostly due to almost zero experience with V3 in Europe.

[tomm.brz]

v3 has a bigger 110mm pulley (v2 has 90mm) so it makes less potential boost but has a bigger suction pipe with no restrictor (v2 has 39mm standard) that gives out more airflow

So basically V3 has less boost than the v2 when <6/7k rpm, and more boost and airflow up until redline.. in Practice, V2 can go faster in low / medium rpm, V3 can go faster over 6000 rpm
But if the fuel is really shitty, they are quite similar anyway

You can either take the v2 and keep the 39mm restrictor , or try upgrading it to a 41mm or 43mm restrictor (or even remove it) and you ll get more boost up top but you need GOOD fuel for it to work good and not knocking like crazy all the time,
95Ron will be quite shitty with it upgraded because of too much boost and heat

The v3 is designed to work nicer with shitty fuel (like 95Ron in europe) because it produces less boost overall so lower temperatures too, and also they upgraded the suction pipe which is expensive if you try to buy as a spare parts


The only sense to me to buy a V3 kit instead of the V2, is if you put a 90mm pulley on it and you really want to push it further, but you'll need forged internals ... that because buying the upgraded suction pipe from hks costs so much more than a 90mm pulley and belt

So i'd just go with V2 and not exagerate with restrictor sizing if you have stock internals

[Yannis]

Thank you!

Yes it is all stock internals and want to stick to that if possible, so was also leaning towards a V2 with an upgrade on the restrictor - like a 41.5mm

Sounds OK from experience? Have also added to my cart the "fuel up" HKS upgrade, which also changes the restrictor to 43mm, but haven't confirmed an order yet, as again mixed feedback.

If I am not mistaken though, can't see high 200's to 300 whp unless you upgrade the injectors, no matter V2 or V3.

Ref. inlet hose for air, I just received a Perrin 3" which is larger than stock (2.7"). Not sure how that compares to HKS V3 pipe diameter, but hope will improve air flow and heat to some extent.

[tomm.brz]

depends on the tuner, i run no restrictor at all and i still run stock injectors, but with 41.5mm you totally can get away with stock injectors, plenty of headroom

what s that Perrin inlet hose? i dont think we mean the same things

[Yannis]

I plan on going for Ecutek, there is a Master Tuner near where. I might go for that then, and depending on dyno, go for the fuel up in a year or so.

Yeah sorry, meant the inlet hose. Do you have reference for the suction pipe of V3, see if worth the money?

[tomm.brz]

it s worth the money only if you buy a V3 and then trasform it in a V2+ kit, but u ll need fuel up and forged internals..

Doing the opposite, V2 and then upgrading to V3 suction pipe is more costly, and you still need fuel up and forged internals and good fuel.. v3 conversion kit costa more than 800€

Ecutek anyway sells the fuel up mostly for E85 use, you won t need fuel up if keeping stock internals and a V2 restricted kit, basically useless

The suction pipe is the metal pipe that goes from air filter to entrace of the charger.. v2 has a quite small one but still
I'd take V2 in ur situation

if u need help i Tuned many hks V2 and v3

[Yannis]

Thank you very very much, went for the V2 and dropped the fuel up for now. Will see where I can find a larger restrictor (41.5 or 43) - if anything tested, pleased to hear. And will revert when everything received

[Project A86]

Hello all!

Sorry i didn’t find but following your reading it seems that a HKS V3 kit with 90 mm pulley would give the best results: similar boost than V2 on low rpm and higher boost top end than V2 unrestricted? The V2 version can provide if I am not mistaken 15 psi of boost unrestricted. Anyone tried or know how much psi a V3 will push with 90 mm pulley?
I assume we can run that option with forged engine on E70 or so. It will be my set up with the supercharger HKS just want to decide on best one to select.

Thanks for your answers!

[tomm.brz]

you know boost with hks can vary depending on exhaust restriction and ambient temperature, anyway with same car, having the V3 suction pipe with that configuration you are talking about will add around +10-15% of both boost and air ingestion (in g/sec) compared to V2 suction pipe

That means in very cold days you can easily surpass 1.1bar of boost

[Project A86]

Thanks very much for your answer! Talking about exhaust system will you need a 2.5 or 3 inches system considering HKS EL header? Does an aftermarket front pipe with 200 cells cat or so will be the bottleneck?
And sure you are completely right about ambient air.

Thanks again!

[tomm.brz]

Originally Posted by Project A86

Thanks very much for your answer! Talking about exhaust system will you need a 2.5 or 3 inches system considering HKS EL header? Does an aftermarket front pipe with 200 cells cat or so will be the bottleneck?
And sure you are completely right about ambient air.

Thanks again!

the bigger and more free the exhaust is, the higher the ignition timings that it will withstand... specially up top it can gain quite a while
Boost wise can be hard to tell, freeing the exhaust can actually even lower a bit the pressure but it actually ingest more air
of course bigger and free-er exhaust is much louder

[Project A86]

Many thanks for your time and answers. I will try maybe both exhaust system. When my build will be ready I will post it.

[Mackizzle86]

Anyone else have installed a wideband A/F ratio gauge with this?
if you've done it, can you pls post more info? TIA.