Cheers San Maru ,

the motor, like the rest of the car is a compromise. the motor has all the best stuff according to the datto engine builder, so i suppose it wouldn't take much to make it an all-out race motor. rev limit is set at 6500 for engine life.

Tom.

Here is the dyno sheet for a motor I built with these specifications:

Stock bore

flat top pistons

N47 head

10:1 CR

Stock cam, no port work

port matched intake

60mm throttle body

Stock F54 short block (no balancing, etc.)

6:1 header

2.5" exhaust with supertrapp muffler

stock 81' 280ZX distributor and coil

Megasquirt fuel injection (fuel only)

stock 280Z injectors

This dyno plot raised my eyebrows a few months back on improvedtouring.com. At the time, it was purported to be a 260Z running flat-top carbs on an engine dyno (data measured at the crank).

Later, one of the owners posted that they now feel that the dyno run must have used round-top carbs, because they are SURE it doesn't make 235 hp at the crank. I will say here (I didn't chime in on the other board because everybody is so arrogant there and the owners have some other nice cars so I figured they knew what they were doing) that I immediately doubted their dyno plot.

The sad part of this story is that these guys took their car to Carolina Motorsports Park last month and had some bad luck. Their carbs were cutting out (been there, experienced that!) so they worked on the floats in their hotel room the night before the race. They posted that their carbs ran well for 3-4 laps of the race, then a plug worked its way loose and they had a fire. Race Results

You can read the discussion about it here

I find it hard to believe that an ITS L26 puts out 235 HP at the crank. Don't ITS cars have to run stock CR, and cam? an 8.5:1 L26 with a stock cam would be lucky to make 160HP at the crank.

Pete

Been building the ultimate L series for a few years now. Here's the last 2 combo's. I did the lot, except for some precision machining. First one (blue line) was a high compression low boost effort with a different gearbox. made about 280hp. The monster red line was my last combo. Went 465hp @ tyres, which is atleast 550hp at the motor. 4 people in the boot couldn't stop it wheelspining either.

Consists of

F54 Block + 1.5mm o/s pistons

Forged pistons/total seal rings

billet rods

modified l28 crank

welded up and reshaped chambers/ports N42 head

custom exhaust, intake and intercooler

MoTeC M48PRO ecu + suitable fuel system

New one being built now.I want 700hp or more at motor this time round.

Stu.

Hi Stu are you in Australia? I think I heard about that motor being up for sale at some point.

Yeah, i'm in Queensland. No, I hadn't offered it for sale before. I've slowly developed it over about 8 or 9 years. had a lot of crankshaft failures early on with the LD28 crank. used to spit out the keyways and chuck a balancer. been using a modified l28 crank with ok results. the power is fairly brutal. makes boost at about 2500rpm, but it's not usable. wastegate starts to control boost at around 3500rpm. from 4000 to 7200 hang on. The blue line was what I ran at the townsville auto show in 2002. but i've done a lot since then.

Thought this thread was dead, unsure as to the validaty of comparing data from such varying sources but well might as well contribute.

2.8 N54 block (no over bore)

Custom height Flat tops producing 48thou quench

Gapless rings

N42 head, ported flow benched specifically for this injection project.

Steel 1 mm head gasket

Stainless valves

310 degree cam

Triple Jenvey 40mm throttle bodies

Emerald 32 bit ECU

252 cc injectors

Carbon fibre 65 mm air horns

Nismo 1 5/8 header and custom collector

Electric water pump, fan etc

250 Hp @ the flywheel

205 @ the wheels

Produced on a dyno owned by a guy who writes a column in several mainstream performance magazines for what its worth.

13.72 on the 1/4 mile

I wanted something I could give all those local kids in the "fast & furious" crowd a run for thier money with.

N-42 Block -Boiled, Bored, Honed

89MM flattop Pistons

New 5.25" rods w/ARP Bolts

Worked E-88 Head w/ Race Porting

LD28 Crank, Magnafluxed & Polished

BHJ Custom Street Balancer/Dampener

478 Lift / 275 Duration Rebello Cam

New Rod & main Bearings

New Intake & Exhaust Valves

All New Timing Chain Kit, Water Pump, Turbo Oil Pump

"Big Bore" Dual SU Carb Mod 50mm

Recurved Distributor w/ Pertronix Electronic Ign Upgrade

MSD BLASTER 2 Ignition Coil Setup (45,000 volt)

Nissan Motorsports Chrome 3into2 Comp. Header 1.5/8" Tubing

2 1/2" Aluminized Exhaust w/ Stainless Steel Magnaflow Muffler

Lightened Aluminum Flywheel 13.5 LB.

Centerforce 2 Clutch & Pressure Plate

280ZX Turbo 5 Speed Transmission

Dyno tuning 1

This pic is several runs combined for fine tuning purposes.

Bar Chart Readout 1

Tried to catch the readout right at peak HP output...i missed slightly.

4500-7300 RPM Readout

Then a complete printout through the RPM range.