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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-20-2020, 07:12 PM   #1
Leviathan83
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Camshafts upgrade

Hi to everyone.

I'm planning to modify FA20 engine with forged internals, new valves, new valve springs and install the HKS Supercharger V2.
In these days I'm considering also the possibility to upgrade also camshafts with something more "spicy".
However someone says that this is a mod that has some issues, because the benefits concern mid and high-range power with loss in low-range... is that correct?

Except for HKS Cams (that require hks stroker kit) I found only Piper Cams as alternative, in the configuration:
- Fast Road SUBFA20BP270 262° 266°
- Ultimate Road SUBFA20BP285 272° 266°
I wrote to Piper Cams about installation and they said the 270 fast road camshaft should allow to install without the need for any changes or modifications; the 285 will require valve train component modification, so valve springs and it is possible you may need to shim in case of a clearance issue.
In pratical, what kind of work it's need to install the 285 cams to avoid clearance issue?
Could be relevant the difference between 270 and 285 in terms of performance?
And is it a modification that makes HKS supercharger (and other upgrades on internals component and valvetrain I'm planning to do) more efficient and usable?

Sorry for my question (and my English), I'm not an expert!
I know that there are several posts about camshafts; in these days I read lots of them (especially about Piper Cams) but I didn't find informations about the questions I have.

Thanks to all of you for answering!
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Old 01-22-2020, 03:20 AM   #2
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I’m currently building my own engine that is also running a HKS V2 Supercharger

I am not upgrading the valves but I am using GSC beehive springs so somewhat similar

From the research I’ve done the OEM head and camshafts are actually very good and flow quiet well, I think if you are going with new valves a +1mm oversize on the exhaust valves and some light porting is probably all you need to extract the maximum out of a HKS V2

I think the lack of aftermarket cams probably says a lot about the ultimate need for them when not chasing huge numbers, but of course that’s just my opinion.


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Old 01-22-2020, 10:05 AM   #3
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The lack of aftermarket options may also be due to the stock camshaft design being pretty good (fat lobes and near infinite adjustability with ACVS). Before ACVS a higher lift and longer duration camshaft would be an easy HP gain. Not so much now. Link to my post from 5 years ago.

https://www.ft86club.com/forums/show...4&postcount=24
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Old 01-22-2020, 11:34 AM   #4
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I think someone is selling piper cams in the classifieds
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Old 01-22-2020, 02:48 PM   #5
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Originally Posted by Lantanafrs2 View Post
I think someone is selling piper cams in the classifieds
https://www.ft86club.com/forums/showthread.php?t=133380
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Old 01-22-2020, 06:02 PM   #6
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Quote:
Originally Posted by bobel View Post
I’m currently building my own engine that is also running a HKS V2 Supercharger

I am not upgrading the valves but I am using GSC beehive springs so somewhat similar

From the research I’ve done the OEM head and camshafts are actually very good and flow quiet well, I think if you are going with new valves a +1mm oversize on the exhaust valves and some light porting is probably all you need to extract the maximum out of a HKS V2

I think the lack of aftermarket cams probably says a lot about the ultimate need for them when not chasing huge numbers, but of course that’s just my opinion.


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Thanks for your reply. I considered the possibility to go with +1 valves, but I think this job is very expensive (do you know approssimately how much could be?)... And you have to find someone reliable to do it. By now, I didn't find anyone to do the job...
Is possible to enlarge without damaging heads?

Quote:
Originally Posted by Apoc View Post
The lack of aftermarket options may also be due to the stock camshaft design being pretty good (fat lobes and near infinite adjustability with ACVS). Before ACVS a higher lift and longer duration camshaft would be an easy HP gain. Not so much now. Link to my post from 5 years ago.

https://www.ft86club.com/forums/show...4&postcount=24
This is very interesting. I read that article some years ago, but I forgot it. Thanks. I thought that also the aftermarket cams could be as flexible as stock ones...
In terms of performance, maybe camshafts don't make this huge difference. Seeing HKS graphs with their camshafts, the gain is only 10 HP and 12 nm of torque with more displacement and V2... Maybe Piper Cams don't change a lot from HKS.


I don't know if new camshafts and new spring allow to push rpm... even if I heard that HKS compressor is rated for max 7.400 rpm...


Quote:
Originally Posted by Lantanafrs2 View Post
I think someone is selling piper cams in the classifieds
Quote:
Originally Posted by Dzmitry View Post
Thanks for the link. Yes, I saw it, but it's the Rally version...

I found also this article https://dsportmag.com/the-tech/educa...haft-analysis/
and this unofficial data for these Piper Camshafts; unfortunately nothing similar for stock cams... what do you think?

Fast Road


Ultimate Road

Last edited by Leviathan83; 01-22-2020 at 06:26 PM.
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Old 01-22-2020, 08:06 PM   #7
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FBM also makes a cam. Could reach out to them for a full built head. I doubt cams do too much without oversized valves and some port work on the fa20s. But the more boost you make the possibility for cams potentially being more beneficial increases.

http://fullblownmotorsports.com/full...age-1-camshaft
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