FA 20 block power limit
 

Hi everyone, Nige here from the UK..

I have been looking around on the net for an answer to my query, but haven't got a definitive answer yet.. thought maybe someone here could help??

As some of you will know I'm building a track car and am going to turbocharge it. I have a GTX3071R but am being led down the path of getting something bigger, like a 3576 or 3582.

So, my question is this.. what is the highest power levels tested on a stock Block. Not Pistons rods or crank, but the block. I believe the weak point is the open deck design, am I right.. is this where they fail?

I reckon a 3576 will give 600hp.

I think Gushi from FD still uses the stock block and has like 650hp or so. Upgraded internals of course.

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While I have no first hand experience with this I know that typically on EJ motors when going for very high power they would go to a closed deck and sleeved setup. Not sure if this applys to the FA20 as much or at what point it would be needed.

Gushi's car has a 2JZ

Gush uses a 2J

They tried to built the FA20 but had trouble keeping it reliable and scrapped it after the first year IIRC.

As far as your question goes. I think theres a few guys pushing 600+ on the stock block reliably.

I though he uses the FA20... or did for a year...

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Thanks for the replies guys. Didn't Gushi run an EJ initially?
Beau Yates in Aus used the FA20 for a year then changed to 2J.

The Vsport Aus car runs a built FA, but is nowhere near 500hp.

So, do we think 600hp is safe on the stock open deck? I have read that the EJ is made of monkey metal, whereas the FA is better quality?

Local guy here has 500HP reliably on completely stock block

At first yea he used a flat 4. I don't remember if it was a fa20 or not. I thought it was an EJ they dropped in.

Paging @Knshro13

Probably too busy with FD Orlando.

The '17 manual only blocks have been strengthened compared to previous years.

I have read and seen guys on stock internals supercharged e85 running around 380hp to wheel. So 450 ish to the crank. Can our driveshafts handle 600+? I thought they would blow from the force.

I have uprated shafts, hubs and a Samsonas Sequential 'box, so drivetrain strength isn't an issue.

I'm not talking stock internals here, I am asking about the strength of the block. TBH I wouldn't put any more power through the stock internals, but then, I build my own engines.

Strengthened in what area and how?

The stock block will last up to the HP level where it can't take it anymore. What that number is ranges from about 200 to 600 HP (if you believe the guys on here).
One may last to infinity and the next one pack it in when you go 1 HP over stock. There is zero reliable or accurate way to say "this is the number".
Now my purely speculative number would be that they were engineered with a 30% or so safety blanket so I would GUESS about 300 as a relatively safe max.

http://i65.tinypic.com/jzi80x.jpg

Absolutely not. I have a 3.4 2JZ in my competition car. The FA20 (even if it was fully built with whatever you can possibly imagine) will never come close to the reliability and power delivery of a 2J. EVER. Thats the sad truth.

Also, at one point (before the 2J), we ran a cosworth EJ25. That engine was only good up to 600 reliable whp.


My 2J? 900HP easy.

@SilverSkyline210 has his FA20 at 811 RWHP.



[ame="https://www.youtube.com/watch?v=POhOJCehKS0"]BRZ FA20 6466 turbo whp record 800hp 9000rpm - YouTube[/ame]

Thats so awesome. I love seeing the potential of the FA20.

Unfortunately, it wont last a day in my field. I can guarantee that.

What kind of track are you running where you'd need 600hp? For most tracks, 350whp will be more than enough in our cars.

Because ...


https://staticdelivery.nexusmods.com...1388631865.jpg

Nige

potentially you could commission a stress analysis of the stock block based on the CAD model?
I can provide a CAD solid for you if you wish
any small engineering firm / stress analysts could probably do this probably take a weeks work?

as with all of things aftermarket, it depends what you mean by 'reliable' as folks saying my 600whp set up has been running a year on the street with no issues.....
this is not a good test
as track use with slicks and downforce will be much more taxing compared to a very traction limited street setup where you rapidly run out of road to actually unleash all those ponies.

I think Adrian at Fensport who's running about 550bhp and has been the last year on track is a good person to tap up for advice as that block is essentially stock, just de-burred a bit to remove the 'please break here' points

Mmm interested in this box of yours. Do they do a bolt up/bellhousing and clutch adapter or did you have to fab one up?

I was going to ask the same thing, but i know it's out of my budget lol

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I agree with this actually. Especially given how light your car is going to be Nige.

I may be biased though, knowing that my supercharged will never be able to get me more than 300-350 to the wheel!

Make no mistake that block is FAR FROM STOCK

Would like to know the bending moment of the rods if you happen to get an analysis done :)

The block itself is stock. Stock sleeves, stock bore

The stock FA20 block it self can handle pretty much 500-700 HP if you upgrade the internals. The only reason people blow engines or make holes in their blocks is because a rod or piston breaks and launches into your block at 8000 RPM! So if you upgrade to some 1000HP rods and a low compression piston set for example 9.5:1 or 10:1 you'll be all set. Also don't forget about the valve springs and if you're passing the 400 HP mark, upgrade the crankshaft. Upgrade/replace the head gaskets and the studs also. Other than that, you'll be set for a 350-700 HP BRZ/FR-S/GT86!

I'm running 600hp at the crank and I have the stock crank, headstuds and gaskets. The cranks on these cars are forged factory so there is no need to upgrade it like the old ej.

Oh nice! Good to know since a new crank is very expensive 😅
Could you tell me exactly what you did to your engine and the internals to get to 600 HP? I'm trying to learn as much as I can

Just rods and pistons. There was nothing else available at the time it was built

Not if you put a turbo behind it :burnrubber:

Presumably the turbo would go before it?

It would be an awesome setup, but I didn't hear anything else about that Perrin twin charged FA20DIT, so will assume it blew up.

I have seen 752WHP on a stock casting sleeve.
The problem is they wiggle at around 500 causing gasket failure. You can fix this with bigger head studs and sleeves. If you want to go big don't push a limit or skip a corner trying to get the most on a stock casting. will only cause compounded issues for reliability