In for the long haul Ultimate NA build thread. - Page 26 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Spartarus · 12-15-2015, 09:11 AM

Quote:

Originally Posted by sato

But don't we have chains instead of belts for timing? Maybe a noob like me can't think of interference screwing up something else (please elaborate)

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Not that interference problem. Interference as in piston hitting valve during normal operation, necessitating a different piston design with more clearance. New pistons = more cash.

Other issues include losing much/most of your VVT adjustability range due to the same issue, again necessitating new pistons.

Summerwolf · 12-15-2015, 09:43 AM

There will be a steep learning curve with VVT and those cams, but I'm glad someone is bringing an "affordable" cam option to market. Also with a cam upgrade there can be more progress made in the FI arena as well, suiting cams to your power adder since they say custom grinds are available. The base minimum for those cams are bigger than stock so you would have to lose a portion of idle quality and general drivability but with tuning obviously that can be controlled to an extent.

Now I know we have custom piston options for Piston to valve clearance, but do we many options for better valves, retainers and valve springs to take advantage of those cams?

Summerwolf · 12-15-2015, 09:45 AM

1059.58 currently for the set of four cams..... wow.

Gear_One_Performance · 12-15-2015, 10:09 AM

Making power NA is always so much more expensive, but much more satisfying.

Summerwolf · 12-15-2015, 10:21 AM

Serious question, has anyone tuned with bigger camshafts in the FA20 yet? I did some google work and didn't find anything. The custom cam profiles caveat is interesting.

celek · 12-15-2015, 03:35 PM

Quote:

Originally Posted by Summerwolf

There will be a steep learning curve with VVT and those cams, but I'm glad someone is bringing an "affordable" cam option to market. Also with a cam upgrade there can be more progress made in the FI arena as well, suiting cams to your power adder since they say custom grinds are available. The base minimum for those cams are bigger than stock so you would have to lose a portion of idle quality and general drivability but with tuning obviously that can be controlled to an extent.

Now I know we have custom piston options for Piston to valve clearance, but do we many options for better valves, retainers and valve springs to take advantage of those cams?

Piper has Springs and retainers as well as a few other companies. the problem area is coil bind if the springs do not support the larger lobe as well.

High RPM is going to need a higher spring pressure as well for High RPM and valve float.

celek · 12-15-2015, 03:36 PM

Quote:

Originally Posted by Summerwolf

Serious question, has anyone tuned with bigger camshafts in the FA20 yet? I did some google work and didn't find anything. The custom cam profiles caveat is interesting.

Someone on my FB build page commented they had the 272's @Tim Radley has the street cams.

No one has released any gain numbers though.

solidONE · 12-15-2015, 04:58 PM

Quote:

Originally Posted by celek

Someone on my FB build page commented they had the 272's @Tim Radley has the street cams.

No one has released any gain numbers though.

They're going to swap the cams but not dyno the things.... ooookkkay

Hyper4mance2k · 12-15-2015, 06:24 PM

You should take that manifold and make a 4 barrel carb adapter.

Summerwolf · 12-15-2015, 07:23 PM

I am really interested in these cams and what people truly gain.

celek · 12-16-2015, 08:21 AM

Quote:

Originally Posted by solidONE

They're going to swap the cams but not dyno the things.... ooookkkay

A lot of companies are hush hush on results, or do not bother reporting to the manufacture when using a product as they fine tune it. Unlike myself I will post numbers.

celek · 12-16-2015, 08:23 AM

Quote:

Originally Posted by Hyper4mance2k

You should take that manifold and make a 4 barrel carb adapter.

Won't make as much power without the DI. Would lose the high end timing. Also not customizing the fuel pump setup for lower pressures.

sato · 12-16-2015, 01:18 PM

Quote:

Originally Posted by Spartarus

Not that interference problem. Interference as in piston hitting valve during normal operation, necessitating a different piston design with more clearance. New pistons = more cash.

Other issues include losing much/most of your VVT adjustability range due to the same issue, again necessitating new pistons.

Thanks for the gentle reminder

Quote:

Originally Posted by Summerwolf

1059.58 currently for the set of four cams..... wow.

I know there are four cams instead of two, but wow

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DocWalt · 12-16-2015, 01:57 PM

Seems like a reasonable price for cams IMO, especially if manufactured in a similar fashion to OEM with the hollow shafts and pressed on lobes.

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12-15-2015, 09:43 AM	#352
Summerwolf Panda Trueno Join Date: Jan 2015 Drives: No twin now. Location: North Indiana Posts: 3,349 Thanks: 2,113 Thanked 2,409 Times in 1,332 Posts Mentioned: 17 Post(s)	There will be a steep learning curve with VVT and those cams, but I'm glad someone is bringing an "affordable" cam option to market. Also with a cam upgrade there can be more progress made in the FI arena as well, suiting cams to your power adder since they say custom grinds are available. The base minimum for those cams are bigger than stock so you would have to lose a portion of idle quality and general drivability but with tuning obviously that can be controlled to an extent. Now I know we have custom piston options for Piston to valve clearance, but do we many options for better valves, retainers and valve springs to take advantage of those cams?

12-15-2015, 09:45 AM	#353
Summerwolf Panda Trueno Join Date: Jan 2015 Drives: No twin now. Location: North Indiana Posts: 3,349 Thanks: 2,113 Thanked 2,409 Times in 1,332 Posts Mentioned: 17 Post(s)	1059.58 currently for the set of four cams..... wow.

12-15-2015, 10:09 AM	#354
Gear_One_Performance Senior Member Join Date: Mar 2015 Drives: 2014 BRZ SCCA STU endurance car Location: West Chester, Pennsylvania Posts: 199 Thanks: 2 Thanked 142 Times in 82 Posts Mentioned: 1 Post(s)	Making power NA is always so much more expensive, but much more satisfying.

12-15-2015, 10:21 AM	#355
Summerwolf Panda Trueno Join Date: Jan 2015 Drives: No twin now. Location: North Indiana Posts: 3,349 Thanks: 2,113 Thanked 2,409 Times in 1,332 Posts Mentioned: 17 Post(s)	Serious question, has anyone tuned with bigger camshafts in the FA20 yet? I did some google work and didn't find anything. The custom cam profiles caveat is interesting.

12-15-2015, 06:24 PM	#359
Hyper4mance2k Alexandrino_Auto Join Date: Apr 2014 Drives: series.Blue Location: Greater DMV Posts: 1,014 Thanks: 1,584 Thanked 637 Times in 377 Posts Mentioned: 10 Post(s)	You should take that manifold and make a 4 barrel carb adapter.

12-15-2015, 07:23 PM	#360
Summerwolf Panda Trueno Join Date: Jan 2015 Drives: No twin now. Location: North Indiana Posts: 3,349 Thanks: 2,113 Thanked 2,409 Times in 1,332 Posts Mentioned: 17 Post(s)	I am really interested in these cams and what people truly gain.

12-16-2015, 01:57 PM	#364
DocWalt Senior Member Join Date: Oct 2013 Drives: '22 BRZ Location: PA Posts: 1,960 Thanks: 2,438 Thanked 1,694 Times in 854 Posts Mentioned: 25 Post(s)	Seems like a reasonable price for cams IMO, especially if manufactured in a similar fashion to OEM with the hollow shafts and pressed on lobes.

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