HKS 2.1 stroker kit & camshafts - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

nikitopo · 04-24-2019, 03:57 AM

I would like your opinion on the improvements of the HKS 2.1 stroker kit and the relevant camshaft:

Notice the 20hp improvement in the middle and high rev ranges. In this graph there aren't any exhaust changes.

How it would compare with a stock engine and a good catless header with a tune? No E85 fuel comparisons please.

86TOYO2k17 · 04-24-2019, 11:02 AM

I dont think the cam used on this dyno is the one that is compatible with stock pistons. I believe the one that is, had very minimal gains mostly in the top end because lift cant be increased with out recessed piston heads for valve clearance, only a little duration and it wasn't worth it. If going all out NA looking for some high peak power and money isn't an issue i am sure it would add a little. I could see it stacking well on top of E85 or at least WMI for that top end. maybe some 210whp NAs could be possible on generous dynos.

nikitopo · 04-24-2019, 11:15 AM

Yes I agree. I believe most of the gains are from the stroker kit and the camshaft was used to enhance a bit the top end marked with black circle. The engine displacement increase from the stroker is minimal, but the torque increase looks to be substantial.

I checked also some results from a couple good catless headers. The difference is not that large, so I guess the effort and the cost to install the stroker kit is a serious disadvantage. I would say it makes more sense only if someone combines it with FI. There are other stroker kits too, but these are even more complex with a mandatory cylinder bore honing process.

Pat · 04-24-2019, 11:44 AM

Look at the chart again. That's not horsepower.

nikitopo · 04-24-2019, 11:49 AM

Quote:

Originally Posted by Pat

Look at the chart again. That's not horsepower.

I converted kw to hp

Kodename47 · 04-24-2019, 03:13 PM

I will add here that one of the few cars here in the UK that had a blown engine was running a HKS stroker kit that let go shortly after install. HKS admitted manufacturing defect.

Hawk77FT · 04-28-2019, 06:49 PM

Quote:

Originally Posted by Kodename47

I will add here that one of the few cars here in the UK that had a blown engine was running a HKS stroker kit that let go shortly after install. HKS admitted manufacturing defect.

Very reassuring! Pheww!

nikitopo · 03-24-2020, 07:51 AM

Any update on this? Did anyone install the HKS 2.1 stroker & camshaft kit lately?

04-24-2019, 03:57 AM	#1
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	HKS 2.1 stroker kit & camshafts I would like your opinion on the improvements of the HKS 2.1 stroker kit and the relevant camshaft: Notice the 20hp improvement in the middle and high rev ranges. In this graph there aren't any exhaust changes. How it would compare with a stock engine and a good catless header with a tune? No E85 fuel comparisons please.

04-24-2019, 03:13 PM	#6
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s) Tagged: 1 Thread(s)	I will add here that one of the few cars here in the UK that had a blown engine was running a HKS stroker kit that let go shortly after install. HKS admitted manufacturing defect. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

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04-24-2019, 11:02 AM	#2
86TOYO2k17 Senior Member Join Date: Jan 2018 Drives: 2017 toyota 86 Location: PNW Posts: 2,131 Thanks: 336 Thanked 1,189 Times in 781 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	I dont think the cam used on this dyno is the one that is compatible with stock pistons. I believe the one that is, had very minimal gains mostly in the top end because lift cant be increased with out recessed piston heads for valve clearance, only a little duration and it wasn't worth it. If going all out NA looking for some high peak power and money isn't an issue i am sure it would add a little. I could see it stacking well on top of E85 or at least WMI for that top end. maybe some 210whp NAs could be possible on generous dynos.

04-24-2019, 11:15 AM	#3
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	Yes I agree. I believe most of the gains are from the stroker kit and the camshaft was used to enhance a bit the top end marked with black circle. The engine displacement increase from the stroker is minimal, but the torque increase looks to be substantial. I checked also some results from a couple good catless headers. The difference is not that large, so I guess the effort and the cost to install the stroker kit is a serious disadvantage. I would say it makes more sense only if someone combines it with FI. There are other stroker kits too, but these are even more complex with a mandatory cylinder bore honing process.

03-24-2020, 07:51 AM	#8
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	Any update on this? Did anyone install the HKS 2.1 stroker & camshaft kit lately?

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