True H.P. of the 94 Q45

[Jaydopush_a_q]

Its listed at 278. Q45.org has it between 300-305 and wikipedia has it listed at 330 and 279lb of torque? What is right? Anybody really know?

[Q_SHIP]

I believe the 90-93's were doing 300.

[maxnix]

Depends on fuel (lab standard not available at pump), temperature, humidity, barometric pressure and which ECU is installed, assuming the engine is broken-in, but up to new specifications otherwise. test stand configuration of accessories and intake and exahaust will also have an effect.

By the way, go check the trunk of your car. I'l bet you won't find a y there.

[silver2k2]

This is interesting I would like to see dyno run, I know those very as well. but it would be interesting to see some stock runs to compare.

[Q_SHIP]

I know they were dynoing higher than Infiniti was claiming.

[Jaydopush_a_q]

Ive always admired the car from a distance and I just bought a 94 from an auction for $2000 in pretty great shape. I was just curious.

[Q_SHIP]

InfinitI

[Q45tech]

The stock peak horsepower tends to be right on the money, however the torque was understated up to 4600 rpm when VVT disengaged [shifted to high rpm mode]. 280 hp/300-305 lb/ft.

There is/was at least 10-15% safety reserve that can be coaxed out with ecu retuning and extremely loud exhaust system..............depending on the btu quality of fuel.

[Rex]

The "story" is that JDM automakers had a gentlemens agreement to not export anything rated over 276HP.

Here's an excerpt of an article from car and driver

Japan Dumps 276-hp Pact - Car News BY PETER LYON, January 2005

Since 1989, Japanese automakers have all endorsed—at least on paper—a kind of gentlemen's agreement that limited their advertised horsepower to 276 on domestically produced vehicles. Their primary goal was to avoid a horsepower war in a country where the maximum speed limit is 62 mph. But in October, Honda officially broke the agreement at its Legend (Acura RL in the U.S.) press conference when it unveiled the model's 300-hp, 3.5-liter V-6.

For years, it's been presumed that once an automaker stuck out its neck and ignored the 276-hp mark, the rest would quickly follow. And judging by what's in the Japanese production pipeline, it looks as if the conventional wisdom was correct. Coming on the heels of that new Acura RL will be the Lexus RX400h with an estimated 300 horsepower, and then the flood gates open—Mazda will introduce a 300-hp two-seat RX-7, Acura will again cross the line with a new NSX with at least 400 horses, and Toyota will mark its territory with the supercar on page 36.

Japanese engine designers, however, will readily concede that the country's manufacturers have been building cars with more than 276 horsepower. It's just that none of the automakers wanted to officially break the agreement. It's no secret that Mitsubishi Lancer Evos, Subaru Impreza WRXs, and Nissan 300ZX twin-turbos have been in violation of the agreement for years, but at least in Japan, they all claimed to have 276 horsepower. The false advertising was ignored for the sake of harmony. Not anymore.

That said, the flywheel HP was probably more than that, but few if any have dyno sheets from the first production run VH45DE.

My 95 Q was dyno'ed in April of '04 at 226/256 RWHP/TQ. After mods (Level 10 transmission, ECU tune, headers, etc) in March of '05 it dyno'ed at 274/285 RWHP/TQ.

[maxnix]

That is indeed a nice bump, given same air density and fuel formulation.

[Rex]

It was all Rob's doing and I think it's mainly a combination of the ECU and headers, though there was some improvement in "driveline efficiency" with the Level 10 transmission. He had both runs done in South FL, so I'd figure the temps were fairly close. I know he also had the timing bumped to 17 degrees to eek every bit out of it.

[TgduMg]

My 95 Q was dyno'ed in April of '04 at 226/256 RWHP/TQ. After mods (Level 10 transmission, ECU tune, headers, etc) in March of '05 it dyno'ed at 274/285 RWHP/TQ.

I remember another dyno run in a similarly modded 95 Q that netted 289.8/304.7 on the same day.



Some other dyno numbers I came across for a stock 92 Q45 are 232.4/247.4.

Danisiti 1

[silver2k2]

Sweet

Estimated Fly Wheel Horsepower: 298 @ 5530 rpms [assuming 22 % drivetrain loss] Estimated Fly Wheel Torque: 317 @ 4800 rpms [assuming 22 % drivetrain loss]

[Q45tech]

Unfortunately you cannot use a FIXED PERCENT for frictional losses as they increase with RPM....................if 22.3% is correct for HP at 6,000 rpm [with 160-200 wear index tires] , the same number is not accurate for torque at 4,000 rpm.

Same with gearing as the tire diameter increases with speed.......what is correct at < 100 mph will grow by a few % at 140 mph [6700 rpm in 3rd gear].

People get confused BETWEEN DYNO TYPES where a drum may be 22% a wheel mount may be only 10-12% as the greatest loss component is the wheel to tire and tire to drum frictional loss.

When you test individual components: TC, AT Pump, AT gear, Drive shaft, diff right angle gear. output shafts, wheel bearings, wheel to tire m tire to drum.

TC friction varies with ATF temp and slip speed and rpm [cavitation]Diff friction varies with speed and fluid temp.

MULTIPLE QUARTER MILES are really the only accurate readings and they show wide variations when the increments are disected.