Pushing a M20 to ~450whp !

[sayed ali]

Hello,

I'm looking forward to get your opinions / experiences

Specs:

M20B25 / slightly ported head
84mm crank
O-ringed block
ARP head studs (still waiting for them)
Custom turbo mani
Custom intake mani
80lbs Injectors
Bosch 044
Haltech ECU

Goal : ~ 450 whp - Pump gas

My question is that currently I've a GT35 T70 (copy) turbo (similar to this)

http://www.ebay.com/itm/GT35-T3-T70-TURBOCHARGER-OIL-COOL-TWIN-ENTRY-TURBINE-TURBO-CHARGER-70AR-600-HP-/130992171745

with A/R .63 & I'm planning to put on a turbo cam (vac motorsport) .. Will this turbo + cam can reach that power levels @ reasonable boost ?

Or

Should I buy another decent turbo (thinking of Precision sc 6266) + stock cam .. ?

Thanks in advance,

[beefjurky69]

I run a 6262 t3 with .82 A/R I made 450hp on old motor 17 psi and new motor made 420hp at 15 psi. I would go bigger hot side and vac cam.

[sayed ali]

I run a 6262 t3 with .82 A/R I made 450hp on old motor 17 psi and new motor made 420hp at 15 psi. I would go bigger hot side and vac cam.

Great! What's your motor specs? Pistons, rods, .. ?

[sayed ali]

^ Which cam are you going to run? Mild grind or aggressive grind?

I've just e-mailed vac tech about that but still no answer ..

[beefjurky69]

Im running a Paul Burke built motor 2.8L

Engine block bored to 3.327”, honed and O-ringed (039 stainless O-rings)
2618 T-61 forged turbo piston set (approximately 8.5:1 compression ratio)
4130 steel piston pin set
Diamond finished “Total Seal” gapless piston ring set
81 mm cast iron crankshaft
Eagle 3D H beam connecting rod set
Glycol main bearing set
KS rod bearing set
Laso oil pump
Fully balanced reciprocating components
Street turbo cylinder head porting
Dual valve spring set
New rocker arms
New rocker shafts
New adjusting eccentrics and associated hardware
“Cat Cams” adjustable cam sprocket
“Schrick” 284 camshaft (Paul Burke custom)

[sayed ali]

Mean specs, and thanks for your kindly help .. so what do you think of my motor specs? should i go with a better turbo and see what could i make, then if i didn't satisfied, upgrade to a turbo cam?

[sayed ali]

Are you running ARPs head studs? Do i need them up to ~450whp?

[beefjurky69]

Yea I run arp's torqued to 70 ft lbs...My buddy Bobross who's on this forum has a stock motor Arp's on a holset making 460whp and high 300 tq

[TheTacoMan]

I wouldnt run that ebay turbo, just start out with the right stuff from the beginning.

[sayed ali]

I wouldnt run that ebay turbo, just start out with the right stuff from the beginning.

+1, thanks guys, seems like I'm going with a better turbo, but there is another one comes up in my mind .. BW s366, T4, .88, Billet ..

What do you guys think?

[TheTacoMan]

It depends what you want as far as drive ability versus peak horsepower. Also I would look into a turbo cam, m20 stock cams fall on their face after 5k.

[Q5Quint]

When you double the hp of a stock motor, there are a few things to look at closely.

Mainly ecu/ignition/fuel upgrades
Followed by hardware upgrades. (ie what breaks first?)

Turbo piston, pins, crank upgrades etc are great for longevity, but stock stuff seems to hold up to plenty of boost abuse as well. Not the headgasket, though. The stock intake will hold power, but an upgrade there can get you more. Old stock components become a liability with age, so 'if its open might as well' can help the long term survivability of the hardware. The hardware, no matter how good, wont survive with bad software, so make sure to get that right.

[SLEEPYDUB]

Im running a Paul Burke built motor 2.8L

Engine block bored to 3.327”, honed and O-ringed (039 stainless O-rings)
2618 T-61 forged turbo piston set (approximately 8.5:1 compression ratio)
4130 steel piston pin set
Diamond finished “Total Seal” gapless piston ring set
81 mm cast iron crankshaft
Eagle 3D H beam connecting rod set
Glycol main bearing set
KS rod bearing set
Laso oil pump
Fully balanced reciprocating components
Street turbo cylinder head porting
Dual valve spring set
New rocker arms
New rocker shafts
New adjusting eccentrics and associated hardware
“Cat Cams” adjustable cam sprocket
“Schrick” 284 camshaft (Paul Burke custom)

Do you have a dyno graph that shows when you hit your boost targets?