Turbo LT1 preliminary results
10-29-2011, 08:35 AM
#1
Turbo LT1 preliminary results 495hp 491ft/lbs @ 7psi thru an AUTO (A/F-11.8-12.0, timing only @ 17 degrees)
600rwhp/605rwtq @ 10psi thru an AUTO (A/F-?, timing @ 21 degrees)
LT1Boost Header Kit (stainless)
1.75" headers
3.5" DP
TC78 .96 A/r
40mm JGS Wastegate
60mm JGS BOV
4" A2A IC
3" cold side
355ci
230cc Brodix LT1 Cylinder Heads w/62cc Chambers
Fully CNC ported intake/exhaust/combustion chambers
Cometic "MLS" Head Gaskets
ARP Undercut Head and Main Studs
CP Pistons & Pins - 24cc Dish (Approx. 9.0:1 comp ratio with 62cc heads and .040 gasket)
Total Seal Piston Rings
Manley 5.700" H-Beam Connecting Rods
Callies Billet Steel Splayed 4 Bolt Main Bearing Caps
Callies "Stealth" 4340 3.75" Stroke Crankshaft - Internally Balanced
Fluidampr 7.5 o.d. internal balance 740101
Cloyes Double Roller Timing Chain
Canton Road Race Oil Pan, Melling High Volume (10%) Pump Mel-10552, and Canton Pickup
Trickflow 7.3" Chromemoly One Piece Pushrods TFS-21407300
224/224 .577/.582 114 LSA
monoblade throttle body with the LT1 style IAC and TPS sensors. I have a 3 bar MAP sensor.
adjustable fuel pressure regulator set to about 42 psi at idle. Twin in-tank walbro 255lph fuel pumps, one set to come on at about 5-6 psi. Fuel injectors are Siemen Deka 80lb high impedance injectors.
Ignition is a LSI PCM with D585 truck coils (lower dwell time) and MSD wires with iridium spark plugs gapped at .031"
Rockers are crower 1.65.
Springs are Comp 26094-16. Seat load: 178lbs @1.900''_Open load: 459lbs @1.275_Rate: 449lbs/in
I'm using LS7 lifter with about .00416" preload.
Fans are Flex Lite 410's.
Tranny is a built 4L60E with a 2800 stall.
Rear end is a 12 bolt with 4.11 gears.
Compression ratio should be around 9.2:1.
600rwhp/605rwtq @ 10psi thru an AUTO (A/F-?, timing @ 21 degrees)
LT1Boost Header Kit (stainless)
1.75" headers
3.5" DP
TC78 .96 A/r
40mm JGS Wastegate
60mm JGS BOV
4" A2A IC
3" cold side
355ci
230cc Brodix LT1 Cylinder Heads w/62cc Chambers
Fully CNC ported intake/exhaust/combustion chambers
Cometic "MLS" Head Gaskets
ARP Undercut Head and Main Studs
CP Pistons & Pins - 24cc Dish (Approx. 9.0:1 comp ratio with 62cc heads and .040 gasket)
Total Seal Piston Rings
Manley 5.700" H-Beam Connecting Rods
Callies Billet Steel Splayed 4 Bolt Main Bearing Caps
Callies "Stealth" 4340 3.75" Stroke Crankshaft - Internally Balanced
Fluidampr 7.5 o.d. internal balance 740101
Cloyes Double Roller Timing Chain
Canton Road Race Oil Pan, Melling High Volume (10%) Pump Mel-10552, and Canton Pickup
Trickflow 7.3" Chromemoly One Piece Pushrods TFS-21407300
224/224 .577/.582 114 LSA
monoblade throttle body with the LT1 style IAC and TPS sensors. I have a 3 bar MAP sensor.
adjustable fuel pressure regulator set to about 42 psi at idle. Twin in-tank walbro 255lph fuel pumps, one set to come on at about 5-6 psi. Fuel injectors are Siemen Deka 80lb high impedance injectors.
Ignition is a LSI PCM with D585 truck coils (lower dwell time) and MSD wires with iridium spark plugs gapped at .031"
Rockers are crower 1.65.
Springs are Comp 26094-16. Seat load: 178lbs @1.900''_Open load: 459lbs @1.275_Rate: 449lbs/in
I'm using LS7 lifter with about .00416" preload.
Fans are Flex Lite 410's.
Tranny is a built 4L60E with a 2800 stall.
Rear end is a 12 bolt with 4.11 gears.
Compression ratio should be around 9.2:1.
pure sex! awesome work man! incredible 
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10-29-2011, 06:48 PM
#9
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How much for that kit... ballpark figure?
I'm right around the corner and have been contemplating a turbo build through you for a while. I've been watching your progress on multiple forums over the years and I'm impressed.
10-29-2011, 11:37 PM
#11
10-30-2011, 05:56 PM
#14
Cam is a little small, but I suggested that he get the 1.15A/r turbine housing swapped before changing out the cam (make sure the .96 a/r isnt choking those heads).
looks like he had boost creeping up to 14psi right when he made peak power, but the powerband was already done at that point.
looks like he had boost creeping up to 14psi right when he made peak power, but the powerband was already done at that point.
Last edited by RealQuick; 10-30-2011 at 08:25 PM.
10-31-2011, 08:40 AM
#20
Just for a comparison for you, Mine very similar setup, same turbo, same place. I have LT4 Heads / Intake, slightly bigger cam and @ 11lbs made 643 RWHP and 649 Tq with an M6, going for 15lbs and hopefully surpass my supercharger numbers which was 722 RWHP but this was on the fast gas...Good Luck, Keep on pumping....LT's FTW!!!!