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


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Old 12-21-2013, 03:29 AM   #1
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max "potential" NA power.

So iv been searching around online for quite a while before joining the forum and from what iv gather the peak HP for a NA is around the 200 mark with bolt on's and a tune. I have seen some place's where people have even directly said the peak power is 200 ish with bolt on's and a tune. But i'm curious, once we have more part's on the market such as camshaft's, piston's, rod's, valve's, valve spring's, lifter's, throttle body's and so on. what do you think this engine is capable of. I understand there's no way of knowing anything until the parts are actually here, just curious about idea's on max power once there's more then just bolt on part's.

Also, i understand that the stock throttle body and camshaft are great to begin with but somewhere down the road better one's will be out there.
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Old 12-21-2013, 03:31 AM   #2
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P.S. if you have personally had any part's custom fabricated would you mind letting us know what kind of number's your pushing?
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Old 12-21-2013, 03:40 AM   #3
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I'm glad you started this thread. It's never been discussed. Not even recently. Like so recently that if you just scrolled down you'd see a thread.
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Old 12-21-2013, 03:43 AM   #4
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I'm glad you started this thread. It's never been discussed. Not even recently. Like so recently that if you just scrolled down you'd see a thread.
Are you referring to the stroker thread? a stroker kit is not exactly what i'm speaking about.

Yes, that is internal work but not what i ment.
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Old 12-21-2013, 03:49 AM   #5
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2nd page of more than 100, there is a thread on NA dyno graphs, as well as a multi page thread discussing max NA hp for race applications.
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Old 12-21-2013, 04:00 AM   #6
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Honda S2000 (1st gen) 119 hp/litre @ 8,300 rpm
Ferrari 458 Speciale 132 hp/litre @ 9000 rpm
Caparo T1 159.3 hp/litre @ 10,500 rpm
How much money do you want to spend?
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Old 12-21-2013, 04:08 AM   #7
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Originally Posted by archer View Post
So iv been searching around online for quite a while before joining the forum and from what iv gather the peak HP for a NA is around the 200 mark with bolt on's and a tune. I have seen some place's where people have even directly said the peak power is 200 ish with bolt on's and a tune. But i'm curious, once we have more part's on the market such as camshaft's, piston's, rod's, valve's, valve spring's, lifter's, throttle body's and so on. what do you think this engine is capable of. I understand there's no way of knowing anything until the parts are actually here, just curious about idea's on max power once there's more then just bolt on part's.

Also, i understand that the stock throttle body and camshaft are great to begin with but somewhere down the road better one's will be out there.
I think THIS is the most power recorded for a NA FA20. Runs full bolt-ons with OFT on E85
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Old 12-21-2013, 04:13 AM   #8
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Honda S2000 (1st gen) 119 hp/liter @ 8,300 rpm
Ferrari 458 Speciale 132 hp/liter @ 9000 rpm
Caparo T1 159.3 hp/litre @ 10,500 rpm
How much money do you want to spend?
In the end everything does come down to money, yep. But there is realistic number's and outlandish number. Easy bolt on's will get you to 200 HP. I highly doubt this engine will ever come ever close to 600 HP with just internal's. 300-350, possibly, MABY with highly built engine's. I'm just curious what's possible. I'm not trying to sound like i'm rich, i'm far from rich haha, but its not about how much money it will take to get high number's.
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Old 12-21-2013, 04:17 AM   #9
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I think THIS is the most power recorded for a NA FA20. Runs full bolt-ons with OFT on E85
lol but i'm talking about going PAST bolt on's. Once theres a better camshaft on the market, once there's a throttle body that doesn't cost over $1,000.

lol internal's is my interest.
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Old 12-21-2013, 05:08 AM   #10
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its going to be a case of how many revs the engine can stand

with standard guts you'd be foolish to push the rev limit much higher than it is currently (approx 7500rpm) and as it currently peaks at 6900 to 7000 rpm then this will limit peak power

so to get 250ish brake you need to retune to about 8K with a rev limit of 8,500rpm

based on current level of knowledge this will need valve springs at least, possibly a set of rod bolts

then of course the new cams and shorter inlet tract to achieve the tune

and I wouldn't worry about the throttle until 330Bhp
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Old 12-21-2013, 05:54 AM   #11
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its going to be a case of how many revs the engine can stand
"its going to be a case of how many revs the engine can stand" -->
*https://translate.google.com.au/* -->
"its going to be a case of of how many dollars your wallet can stand".
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Old 12-21-2013, 05:58 AM   #12
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Quote:
Originally Posted by archer View Post
lol but i'm talking about going PAST bolt on's. Once theres a better camshaft on the market, once there's a throttle body that doesn't cost over $1,000.

lol internal's is my interest.
F1 engines are currently producing about 300 hp/liter and they have to survive 4 race weekends each. If you want to license Koenigseggs and Cargines freevalve system you could probably get around 360/liter.

Max piston speed at stock redline is 21.23 meters per second so there's room to rev to around 8500 at stock stroke. Raising the redline any higher and you're going to have to shorten the stroke and ultimately end up sacrificing torque for peak HP and have shit for drivability. (Note, I've made the assumption that the proper modifications have been done to keep bad things from happening)

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Old 12-21-2013, 09:22 AM   #13
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Max I have seen on a dyno was 275 whp.
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Old 12-21-2013, 10:10 AM   #14
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To answer your question. If our engine could breath well enough to produce 160lb-ft at 8500rpm, that would be 260hp. I don't see revving past 8500 as feasible and I don't see the motor producing more than 160lb-ft NA.
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