My question is being that I have the AT 05 with 280 Hp does that mean that I also have similiar stats to the 03' and 04' models. In other words I have learned that the 03 and 04 had more torque while have 28 less hp. So, my question is does my 05 AT have more torque then the 05 MT while losing the 28 hp? So, by adding a spacer would that increase my hp while not losing much if any torque and I would see similiar gains to what the 03 and 04 have seen? Or do we share the same hp of 280 but have different engines and thus won't get the same or close to the same gains? Again does my 05 AT have more torque while losing Hp like the other 03 and 04's. Thanks in advance

 

The 03-04 has 18 hp less(not 28). The 2005 AT has the same specs as the 03-04 6MTs. I'm not sure if the spacer would give you a whole lot but should help at least a lil bit. So, you have more torque than 05 6MTs while having 18 less horsepower than them.
Nirmalya

 

actually i dont think 05 auto has more torque than 6mt, even the number shows higher but auto transmission has torque converter, which would make auto lose lots torque at wheel ! and that's why "most" manual are faster than auto even the hp/tq are the same. SMG AMG tranny are different story

 

He is likely speaking of at the crank and thus KaRuPt you are correct- and the torque converter actually increases the otherwise lost torque from the AT tranny to the wheels differently under varying loads. The spacer will give you enough of a boost to accelerate quicker than a stock 6MT.

 

I was talking about crankshaft hp and torque. The 2005 AT has more torque than the 6MT.

 

YUp, the '05 5AT has 280/270 just like the previous years. The '05 6MT has 298/260.

So yes, your AT will see the same gains from a spacer as previous model years.

--Viral

 

i'm sry to put my head in this, but since everyone is talking about it, i thought it would be a good place to ask this question.

can someone explain to me what a spacer do and is?

 

They're talking about the plenum spacer. The 03/04 intake plenum design did not allow for equal air intake to the rear cylinders. The spacer corrects for the poor factory design increasing power. The 05 was modified so the spacer has minimal effects. do a search, plenty of threads on 'plenum and spacer'

 

i read an interview with a japanese Nissan engineer responsible for the 350Z, and he explained that while the torque in the 05 engine went down by 10, it is more evenly distributed across the band and so the car actually accelerates faster.

 

Typically torque and HP distribution across an extended rpm range is not a problem in normally aspirated engines. It use to be problem in turbo charged engines, and their use to be a condition called turbo lag (the time between hitting the gas pedal and then experiencing the power). The problem was caused by a single large turbo requiring a relatively long time to spool up. From a driver's perspective, this was a lot of fun because at around 4000 rpm all hell would break loose, and the driver would be thrust back into his seat when the turbo finally released its power. So what was fun for the street wasn't very good for the track. With all of the HP and torque provided by turbos, people expected much better track performance.

This problem was resolved in the early 90s when most manufacturers like Porsche and Audi went to smaller twin turbos. On the 996 TT for example the turbos begin to unleash their power at 2000 rpm.

 

^ Nicely put.

 

The '05 5AT is a non-rev up engine, so all mods for the '03-04 should work.

 

Dean-I've searched through like 10 pages of threads looking for any info on the rev-up engine differences..I own a 05 and would love to know more of what you are speaking of.

 

will this work on a g35 03 6mt, the plenum spacer??? if yes, where can i find it

 

This is not neccessarily true as the 6MT still has an advantage in final gear ratio over the 5AT. Taking driveline losses and shifting out of the equation, a 6MT should still be quicker than 5AT due to the (numerically) higher gear ratio (3.3 for 5AT vs. 3.5 for 6MT).

I'm not disagreeing that a spacer or plenum does not/will not help, I'm just pointing this out because much seems to be made about horsepower differences between the '05's but little noted about some of the other mechanical differences.