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.

https://cimg3.ibsrv.net/gimg/ls1tech...931d9f292.jpeg


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

Did you make a pull without that janky little air filter?

Haha yes, all pulls were with no air filter. The plan will be to leave it on while cruising and pull it off when its race time.

Very nice 455GTO. Like you said, very purpose built nitrous motor.

What intake Mani is that? And what all did you have to cut to make it fit?

Its the Edelbrock ProFlo XT manifold. And yes, I had to cut the metal cowl all the way back to the firewall as well as cutting the center of the hood. Whats nice is, when you put the plastic cowl trim back on you cant see any of the cutting and looks like it goes with the car.

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.

with that cam and setup i think you will see more with a supervic and 4150tb