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Old 12-14-2016, 03:31 PM   #1  
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Default Starting a DIY build - NA8 - a good reliable 350hp

Hey,

I'm starting my ver2.0 turbo build, my current is a stock 1.8 NA 97 with TD04H-13C turbo (very small), I push it upto 15psi where it is out of efficiency but run very strong when the IAT is still normal around, 250whp.

Now I want a built engine and a setup that can put out around 350whp, I ordered some stuff and I was planning on a gt2560r, but I understand now that it will make past 300whp only in special cases of stroker engine and so...

Well, I got rods pistons and all the rest on the way, what turbo do I want... any chance no ending up with a 6000-7500rpm power band ?

On the way for now:
ebay rods+arp2000
arp head + main
complete engine kit, timing, water pump, oil pump, oversized 83.5mm stock pistons, all the engine gaskets- if the pistons will not fit I don't care - it is a great kit for it's price
injectors - currently RX7 460cc @ 92%, I need 800-1000cc I guess.

I got a custom tubular manifold.
FM stage 1 clutch NIB
EBC
DIYPNP - I tune it
6spd
NB LSD

I need the right turbo to get me to 350whp~

2560 @ 20psi will not put more then 300?

Thanks
Elior

Last edited by elior77; 12-15-2016 at 06:47 AM.
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Old 12-14-2016, 04:43 PM   #2  
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Fuel pump?
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Old 12-15-2016, 12:59 AM   #3  
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Which eBay rods?
2871 would be a good option.
Are you going to do pump or e85?
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Old 12-15-2016, 02:03 AM   #4  
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Fuel pump is a must over 300, so I'll get one.
Rods:
Connecting Rod Rods for Mazda MX5 MX-5 Miata B6 BP 1.6 1.8 Conrods ARP Bolts msr | eBay

Got them for 255$+the ARP2000.

2871 ? ok I'll check its map.
I see that the 6258 looks perfect - it is ?
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Old 12-15-2016, 06:47 AM   #5  
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The fuel system needs upgrade ? beside pump and injectors.

Thanks
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Old 12-15-2016, 08:00 AM   #6  
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EFR 6258 is probably what I would be looking at. A 2560 might get you over 300whp on a perfect day out, but not much more then that.
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Old 12-15-2016, 09:20 AM   #7  
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Quote:
Originally Posted by elior77 View Post
Fuel pump is a must over 300, so I'll get one.
Rods:
Connecting Rod Rods for Mazda MX5 MX-5 Miata B6 BP 1.6 1.8 Conrods ARP Bolts msr eBay

Got them for 255$+the ARP2000.

2871 ? ok I'll check its map.
I see that the 6258 looks perfect - it is ?
Are those rods proven?

that turbo does seem perfect but I didn't mention it because of the price. Lol

Quote:
Originally Posted by elior77 View Post
The fuel system needs upgrade ? beside pump and injectors.

Thanks
to run e85 yes you'll need bigger than 460cc and a fuel pump.
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Old 12-15-2016, 09:21 AM   #8  
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6258 or 6758 ?
  • EFR6258: 150-325whp, ideal for pump gas and stock engines
  • EFR6758: 250whp-450whp, ideal for built engines or flex-fuel (E85)
.64 or .85 ar ?

Last edited by elior77; 12-15-2016 at 09:32 AM.
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Old 12-15-2016, 09:28 AM   #9  
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Quote:
Originally Posted by elior77 View Post
6258 or 6758 ?
  • EFR6258: 150-325whp, ideal for pump gas and stock engines
  • EFR6758: 250whp-450whp, ideal for built engines or flex-fuel (E85)
you want the 6258.
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Old 12-15-2016, 09:42 AM   #10  
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I going for 350whp so I understand the 6258 is not there.
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Old 12-15-2016, 09:53 AM   #11  
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Quote:
Originally Posted by elior77 View Post
I going for 350whp so I understand the 6258 is not there.
Are you running e85 or pump? The bigger will give you headroom but, I still think the 6258 is a good fit specially if you're running e85
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Old 12-15-2016, 09:57 AM   #12  
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for now it is pump
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Old 12-15-2016, 09:58 AM   #13  
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If you truly want 350whp reliability, you need forged pistons. You are already going to have to overbore for the larger stock pistons, might as well go a little bigger with the forged and not worry about them in the future.
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Old 12-22-2016, 09:27 AM   #14  
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Why not just change the rods and keep the pistons ?
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Old 12-22-2016, 10:13 AM   #15  
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why go through all that work and leave it to chance?
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Old 12-22-2016, 10:31 AM   #16  
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How risky is that ? I know other engine run 400-500hp on stock pistons...
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Old 12-22-2016, 11:21 AM   #17  
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Quote:
Originally Posted by elior77 View Post
How risky is that ? I know other engine run 400-500hp on stock pistons...


Other engines flow better
Other engines have more displacement
Other engines have a lower compression ratio
Other engines have forged pistons from the factory
Other engines...etc.
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Old 12-22-2016, 11:41 AM   #18  
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Why aim so low?
Go for 650whp on stock block
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Old 12-22-2016, 11:52 AM   #19  
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Quote:
Originally Posted by aidandj View Post


Other engines flow better
Other engines have more displacement
Other engines have a lower compression ratio
Other engines have forged pistons from the factory
Other engines...etc.
Pistons are about heat not power.
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Old 12-22-2016, 11:53 AM   #20  
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WTF does that have to do with other engines?

Power is heat.
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