How to Get from '03 260bhp to '05 298bhp
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How to Get from '03 260bhp to '05 298bhp
The '05 6MT output has been upped from 260bhp to 298bhp without an increase in the displacement. Does anyone have any details on how thi sis achieved?
I'd certainly like 298bhp from my '03 if the mods are straightforward.
I'd certainly like 298bhp from my '03 if the mods are straightforward.
Former G35 Driver
Joined: Feb 2005
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From: Daly City / Los Altos
Originally Posted by Edwin
The '05 6MT output has been upped from 260bhp to 298bhp without an increase in the displacement. Does anyone have any details on how thi sis achieved?
I'd certainly like 298bhp from my '03 if the mods are straightforward.
I'd certainly like 298bhp from my '03 if the mods are straightforward.
The 05 automatic is rated 280hp. The 03 auto sedan is rated at 260hp, but it really is making about 270-275hp or so according to the dynos. The only real change on the autos is the variable exhaust timing which isn't worth much compared to variable intake timing. The 6MT 298hp motors have a 7000rpm limiter in place of the 6600rpm limiter, variable exhaust timing, the engine block is beefed up to handle the extended rpm, and I can only assume the cams are different because the 298hp motors lost 10 ft/lbs of torque (compared to the autos) to gain the extra 18hp. Trading low end torque for higher rpm HP almost always suggests a change in cam shaft lobes.
Originally Posted by DaveB
The only real change on the autos is the variable exhaust timing which isn't worth much compared to variable intake timing.
Originally Posted by THX723
That is correct. Only the MT models (Sedan and Coupe) will have the added Exhaust Variable Valve Timing.
For those that are still confused, this has been clearly outlined in one of the *official* Nissan/Infiniti press-release. Some of the lines quoted above are refering to the variable flow muffler that's standard for all sedans.
I was also able to confirmed the above by cross referencing the '05 Engine/ECU service manual.
Finally ... these are the cold hard facts:
For '05 model years ...
- all 6MTs (sedan and coupe) rated at 298hp and have variable valve timing at the Intake AND exhaust side.
- all 5ATs (sedan and coupe) rated at 280hp and have variable valve timing at the Intake side ONLY. The previously detuned 5AT sedan now finally enjoys the same ignition timing maps as the rest of the family ... accounting for the uprated hp.
For '04 model years and prior ...
- all MTs and ATs have variable valve timing at the Intake side ONLY.
- AT/MT coupe and MT sedan have identical ignition timing maps (which btw are also identical to the 350Z ignition maps). This group is rated at 280hp. The MT sedan was never officially rated at 280hp.
- AT sedan has detuned timing maps. It is rated at 260hp.
For those that are still confused, this has been clearly outlined in one of the *official* Nissan/Infiniti press-release. Some of the lines quoted above are refering to the variable flow muffler that's standard for all sedans.
I was also able to confirmed the above by cross referencing the '05 Engine/ECU service manual.
Finally ... these are the cold hard facts:
For '05 model years ...
- all 6MTs (sedan and coupe) rated at 298hp and have variable valve timing at the Intake AND exhaust side.
- all 5ATs (sedan and coupe) rated at 280hp and have variable valve timing at the Intake side ONLY. The previously detuned 5AT sedan now finally enjoys the same ignition timing maps as the rest of the family ... accounting for the uprated hp.
For '04 model years and prior ...
- all MTs and ATs have variable valve timing at the Intake side ONLY.
- AT/MT coupe and MT sedan have identical ignition timing maps (which btw are also identical to the 350Z ignition maps). This group is rated at 280hp. The MT sedan was never officially rated at 280hp.
- AT sedan has detuned timing maps. It is rated at 260hp.
Original entire thread
Mods, can we make the above thread or at least THX723's posts a sticky? This topic has been coming up way too much.
Originally Posted by kailep
According to the 2005 brochure, there is no variable exhaust timing. It is ONLY on the intake valves.
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BeerViper
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Jan 13, 2006 01:27 PM
