403ci Ls2 Nitrous Build Dyno Results (NA)
#1
403ci Ls2 Nitrous Build Dyno Results (NA)
Finally got the car on the dyno after sorting out spark issues. Ended up swapping over to the D585 truck coils along with br7ef plugs to get the car dialed in on the motor. Spent about 2 hours on the dyno getting the AFR to be correct and I am pretty happy with the end results considering its a dedicated nitrous build with a super tight 3400 converter. The injector duty cycle was at 102% with the FAST 36lb injectors so I just swapped in some Siemens Deka 60lbers.
DYNO SHEET ATTACHED
As far as the torque being so low for a stroker I would imagine its due to the valve events of the nitrous cam opening the exhaust valve extra early. It wont be a record setter on the motor but when we hit it with the 300-400 shot it should really shine.
483WHP
405WTQ
Looks like Ill spin it up to 7k for shifts.
Below are the build specs:
Bottom End
2005 Ls2 Block (honed .005" over)
Precision Engine Parts forged 4" crank-24x
Precision Engine Parts forged H-beam rods
King Race main&rod bearings
ARP 2000 Rod bolts
ARP main studs
Wiseco -8cc 4.005" pistons
Upgraded tool steel pins
Steel top ring/nappier second (.028/.030 ring gaps for heavy nitrous)
GM Ls2 head gaskets
Powerbond balancer
Turn one power steering pump w/pulley
11.2:1 compression
Valve-train
BTR stroker nitrous cam (251/266 .632"/.596" 112+4)
BTR Platinum .660" springs
BTR titanium retainers
BTR seals/locators/locks
BTR Trunion rockers
Morel 5315 lifters
LS2 trays
Manton 11/32 push rods
GM timing gear/cam sprocket with ARP bolts
New HD GM Timing chain with dampener
Melling oil pump
Improved Racing pickup girdle (awesome product)
NGK -9 plugs
Top End
Advanced Inductions 226cc (243) heads (resurfaced for the swap)
63cc chambers
FAST 36lb injectors
Edelbrock Pro Flo manifold
Edelbrock 90mm TB
PCV delete with catch can
Speed Engineering 1 7/8 headers
TSP ORY with cutout
DYNO SHEET ATTACHED
As far as the torque being so low for a stroker I would imagine its due to the valve events of the nitrous cam opening the exhaust valve extra early. It wont be a record setter on the motor but when we hit it with the 300-400 shot it should really shine.
483WHP
405WTQ
Looks like Ill spin it up to 7k for shifts.
Below are the build specs:
Bottom End
2005 Ls2 Block (honed .005" over)
Precision Engine Parts forged 4" crank-24x
Precision Engine Parts forged H-beam rods
King Race main&rod bearings
ARP 2000 Rod bolts
ARP main studs
Wiseco -8cc 4.005" pistons
Upgraded tool steel pins
Steel top ring/nappier second (.028/.030 ring gaps for heavy nitrous)
GM Ls2 head gaskets
Powerbond balancer
Turn one power steering pump w/pulley
11.2:1 compression
Valve-train
BTR stroker nitrous cam (251/266 .632"/.596" 112+4)
BTR Platinum .660" springs
BTR titanium retainers
BTR seals/locators/locks
BTR Trunion rockers
Morel 5315 lifters
LS2 trays
Manton 11/32 push rods
GM timing gear/cam sprocket with ARP bolts
New HD GM Timing chain with dampener
Melling oil pump
Improved Racing pickup girdle (awesome product)
NGK -9 plugs
Top End
Advanced Inductions 226cc (243) heads (resurfaced for the swap)
63cc chambers
FAST 36lb injectors
Edelbrock Pro Flo manifold
Edelbrock 90mm TB
PCV delete with catch can
Speed Engineering 1 7/8 headers
TSP ORY with cutout
Last edited by 455GTO; 04-10-2016 at 03:52 PM.
#6
As for the hood, there is the center piece that bulges out and had to cut that entire piece. Its a 2 piece construction so its only the underside of the hood that was cut.