Hi everyone,

I have an 04 g35 Sedan Auto. rated 260hp/260 tq

i was wondering if anyone knows the difference of power to the wheels between my 04 and the 05 280 hp/280 tq.

I been hearing that the 04 was underated and that its is just as powerfull as the 05 VQ.

Let me know

 

Horsepower went up, but torque went down. Some say the revup motor exhaust changes gave the extra punch, but honestly seems mostly to be marketing

 

As far as I know, the 280hp motors are not REV-UP. They are the same as the 287HP Z Motors.

The 298HP 6MT engines on 05-06 are the REV-UP motors, along with the 300HP 05-06 6MT 350Z. The 05-06 Autos are 280HP non rev-up motors.

 

According to a handful of dynos, the 260hp 03/04 cars make close to the same wheel power as the 05+ cars. When I say "close", we're talking about 2-3whp difference on average. The 260hp cars seem to be making about 275hp or so. According to the drag section, the 03/04 cars are just as fast, if not faster. That tells me the 03 through 06 VQ35 (non-Revup) are equal.

 

On a related note, does anyone know what the 280hp engine is rated at under the new SAE standards that the 07 G Sedan was rated with?

 

275

 

The 298 "rev-up" motor makes 246wHP in 5th Gear (direct drive) on its 4th pull (lowest pull) highest was 248wHP @ 7,000RPM..

No it is not a marketing scheme.. How they achieve the extra HP was due to the design of the Plenum (AKA Intake Manifold)... The original VQ motor in the G35 had long runners giving the air more velocity (physics).. with more velocity the engine is able to burn more fuel + air (power) allowing more torque and higher HP at low RPMs - Explaining why the original VQ has more torque.. Now the new "Rev-Up" motor uses short fat runners in the intake manifold aka plenum.. this causes the motor to loose low end power (lower torque rating) but on the upside the motor breaths better at high RPM explaining why Infiniti upped the rpm to 7k instead of 6.5k.. if you dyno a regular VQ up to 7k you'll probably notice the power curve starts going down at its peak (6.5k)... To put it simple: Your engine is like a giant air pump.. it transfers heat and air into power.. the faster/more air you can get in & out the more HP you'll make.. Why is that? the more air you put in each cylinder the harder it'll push down on the piston when heat expands it (ignites)...

Infiniti also upgraded the Rods and added variable valve to the exhaust cam and i believe a different ECU is used. Why? the results were a lot smoother power curve (so it should = better acceleration)..

The new G35 engine uses TWO intakes.. it probably has butterfly valves or one short and one long runner in the intake manifold.. why? with its 298hp at 7,000 RPM the engine is already at peak efficiency.. the only way they're going to get more air in that thing is if they make the runners even bigger and by doing that sacrificing even MORE low end power (which is a no no)... to achieve 8,000 RPM @ 306HP they probably used one of the above methods.. by doing this they an have a short runner (or block of a portion of the runner) and by doing this it'll increase air velocity and help low end power.. but when the engine starts picking up RPMs they'll open up the runners allowing a bigger & fatter runner to supply enough air at 8,000 rpm to produce 306hp..

IMO if you can get 100hp per liter you've made one hell of a N/A motor.. now 306 out of a 3.5L v6... thats pretty impressive from a factory tuned fully warrantied luxury car...

Edit: the new SAE rating requires manufactures to dyno their motors with ALL accessories on them. as if they're actually in the vehicle.. so its more accurate but still does not include power loss caused by the torque convertor, clutch packs, etc.. (if auto), clutch + flywheel & trans (MT), drive shaft, rear gear box, axles, your big 20" rims, weight of the brakes, etc...

bored.. sorry bout the long response

- Eric

 

I have driven an '03 5AT and it feels much faster than my '06 6MT.

If I were to install the MREV2 and a spacer, would I achieve about the same performance? Considering all else is equal...

 

+1, and don't forget the 03-04 is over 100lb lighter than 05-06.

 

1. U probably felt it was faster, in reality it is not, considering u have a good driver in 6MT.

2. Refer to the my first answer, most likely u will trap higher with Mrev2 and Spacer if ur 60ft times and weather conditions are the same.

 

sorry to say this but what you feel isnt what it seems.. what you feel is the difference in the power curve.. because the rev up has a smoother curve you FEEL like its not as fast... however in reality it is.. the spacer changes that curve and moves the peak hp to 6.5k ish rpm instead of the 7k.. most of us drive in mid range RPM and we arnt in the last 1,000 often thats why the motordyne FEELS faster...

 

Coming from a 287HP 350Z (03) to a 298HP "Rev-Up" G, I will also tell you the Z "feels" faster. But when I realize how fast the G gets up to speed, the Rev-Up seems a little quicker, just not as "gutsy". Of course this would make sense.

 

My bone stock 04 6MT put down 240/240 on a Dynojet. One the same day a 05 (auto though) put down about 225/230 with a spacer, intake and Stillen exhaust.

A year earlier my 03 350Z 6MT put down 236/234 with no mods. I am not sure it is fair to compare, but regardless I would say the 03/04 G35's were under-rated. The Z feels faster because of the higher gearing (and is faster for that matter).